One-way valve and two-stage high-pressure pump

Abstract

The one-way valve comprises a valve cover, a valve seat and a valve element, the valve element is made of titanium alloy, so that the valve element is not prone to being corroded by seawater, the valve element is not prone to being abraded even if the valve element acts at high frequency in the second-stage high-pressure pump with large flow and high water pressure, and therefore the service life of the one-way valve can be prolonged, and the service life of the one-way valve is prolonged. And the overhaul and maintenance frequency of the secondary high-pressure pump is reduced. Moreover, one end of the valve element is provided with a rear guide part, high-pressure seawater entering from a water inlet hole in the valve seat can be shunted and guided, so that the high-pressure seawater acts on the stress surface of the end of the valve element more uniformly, the high-pressure seawater can keep impacting the valve element in the axial direction of the one-way valve as much as possible, and therefore the movement of the valve element can be guided; therefore, vibration and abrasion of parts can be avoided, and the service life of the one-way valve is further prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of one-way valve technology, specifically relating to a one-way valve that can be used in high-pressure seawater environments and a two-stage high-pressure pump. Background Technology

[0002] A check valve is a widely used device in fluid control, allowing fluid to flow in one direction within a pipe or system while preventing flow in the opposite direction. Currently, there are many check valves with different structural types on the market, but most are difficult to apply well to high-pressure seawater environments. For example, in a system used for reverse osmosis treatment of seawater to obtain freshwater and concentrated seawater, multi-stage reverse osmosis modules are employed. The second and subsequent reverse osmosis modules utilize a second-stage high-pressure pump. A check valve is installed in the flow channel of the second-stage high-pressure pump. The concentrated seawater, pressurized and concentrated by the previous stage reverse osmosis module, is input to the second-stage high-pressure pump, and the check valve, in conjunction with the pressurization components, further pressurizes the concentrated seawater. In this scenario, some existing check valves are unsuitable, mainly due to the following issues:

[0003] Firstly, prolonged operation of the check valve in highly concentrated seawater causes corrosion to its components, leading to impaired valve core movement, accelerated wear, and even valve failure. Secondly, the high water pressure and large flow rate required in the secondary high-pressure pump subject the check valve core to significant impact forces. Combined with the high-frequency operation of pressurizing components and the corrosive effects of seawater, this results in rapid component wear and a short lifespan for the check valve. To avoid these problems, frequent manual maintenance is necessary. However, because the secondary high-pressure pump flows through highly concentrated seawater and typically employs a complex sealing structure, it is difficult to easily inspect or replace the check valve. Often, the entire secondary high-pressure pump needs to be returned to the factory for repair, resulting in high operating costs and difficulty in maintaining stable operation over extended periods. Utility Model Content

[0004] This utility model is designed to solve the above-mentioned problems, and its purpose is to provide a one-way valve that is suitable for high-pressure seawater environments and whose valve core can move more stably under high-pressure water flow. The utility model adopts the following technical solution:

[0005] This utility model provides a one-way valve installed in a two-stage high-pressure pump for pressurizing seawater. The seawater input to the two-stage high-pressure pump is seawater pressurized by the first-stage high-pressure pump. The one-way valve has the following technical features:

[0006] The one-way valve provided by this utility model may also have the following technical features: the valve cover is made of titanium alloy and the valve seat is made of stainless steel.

[0007] The one-way valve provided by this utility model may also have the following technical features: the valve cover is cylindrical in the axial middle and has multiple water passage holes. The water passage holes are strip-shaped holes with round ends, and their length direction is consistent with the axial direction of the valve cover. The multiple water passage holes are evenly distributed along the periphery of the valve cover.

[0008] The one-way valve provided by this utility model may also have the following technical features: the inner wall of the valve cover between two adjacent water passages has a flow guide protrusion that protrudes toward the central axis of the valve cover, which is used to guide the seawater flowing into the valve cover; the valve core also has a valve core body integrally formed with the rear guide portion; the valve core body is disc-shaped; the rear guide portion includes multiple plate-shaped flow guide plate portions; one end of each flow guide plate portion is connected to the valve core body; the multiple flow guide plate portions divide the surface of the valve core body into multiple areas of equal area.

[0009] The one-way valve provided by this utility model may also have the following technical features: the guide plate portion is rectangular plate-shaped, and its surface direction is parallel to the axial direction of the valve core body. There are three guide plate portions, and one side of the three guide plate portions is connected at the central axis of the valve core. The included angle between two adjacent guide plate portions is 120 degrees.

[0010] The one-way valve provided by this utility model may also have the following technical feature: the outer periphery of the valve core body has a guide surface, which is perpendicular to the radial direction of the valve core body, and the guide surface is in contact with the inner peripheral surface of the valve cover, thereby providing guidance when the valve core moves within the valve cover.

[0011] The one-way valve provided by this utility model may also have the following technical features: the end of the water outlet facing the valve cover has a sealing surface, which is part of a conical surface; and the edge of the valve core body facing the valve seat has a sealing mating surface that matches the sealing surface.

[0012] The one-way valve provided by this utility model may also have the following technical features: the one-way valve further includes a return spring for driving the valve core to move toward the valve seat, wherein the valve core has a spring limiting protrusion at the middle of one end facing the valve cover, the return spring is disposed inside the valve cover, one end of which is fitted on the spring limiting protrusion, and the other end is located between the plurality of flow guiding protrusions and is held by the plurality of flow guiding protrusions.

[0013] This utility model provides a two-stage high-pressure pump, which has the following technical features: the two-stage high-pressure pump includes a hydraulic end having a seawater channel, a one-way valve, and a pressurizing component, wherein the one-way valve is disposed in the seawater channel and is used to cooperate with the pressurizing component to pressurize the seawater in the seawater channel. The one-way valve is the one described above.

[0014] The two-stage high-pressure pump provided by this utility model may also have the following technical features: the pressurizing component is a plunger; the seawater channel has a high-pressure inlet and a high-pressure outlet; and multiple one-way valves are provided, which are used as inlet valves and outlet valves respectively, and are respectively located next to the high-pressure inlet and the high-pressure outlet.

[0015] Functions and effects of utility models

[0016] According to the one-way valve and two-stage high-pressure pump provided by this utility model, the one-way valve includes a valve cover, a valve seat, and a valve core. Since the valve core is made of titanium alloy, it is not easily corroded by seawater. Even in the high-frequency operation of the two-stage high-pressure pump with high flow rate and high water pressure, the valve core is not prone to wear, thereby improving the service life of the one-way valve and reducing the frequency of maintenance of the two-stage high-pressure pump. Furthermore, one end of the valve core has a rear guide portion, which can divert and guide the high-pressure seawater entering from the inlet hole on the valve seat. This allows the high-pressure seawater to act more evenly on the force-bearing surface of that end of the valve core, and ensures that the high-pressure seawater impacts the valve core along the axial direction of the one-way valve as much as possible. This guides the movement of the valve core, maintaining its axial motion, thus avoiding vibration and component wear, further improving the service life of the one-way valve. Attached Figure Description

[0017] Figure 1 This is a perspective view of the one-way valve in an embodiment of this utility model;

[0018] Figure 2 This is a cross-sectional view of the one-way valve in an embodiment of this utility model;

[0019] Figure 3 This is an exploded view of the one-way valve in an embodiment of this utility model;

[0020] Figure 4 This is a perspective view of the valve core in an embodiment of this utility model;

[0021] Figure 5 This is a perspective view of the two-stage high-pressure pump in an embodiment of this utility model;

[0022] Figure 6 This is a cross-sectional view of the secondary high-pressure pump in an embodiment of this utility model;

[0023] Figure 7 yes Figure 6Enlarged view of the inner part of frame A;

[0024] Figure 8 This is a structural diagram of the secondary high-pressure pump under maintenance in an embodiment of this utility model.

[0025] Figure label:

[0026] One-way valve 10; Valve cover 11; Outlet end 11A; Mounting end 11B; Mating protrusion 111; Outlet hole 112; Through hole 113; Guide protrusion 114; Reset element limiting groove 1141; Valve seat 12; Mounting mating end 12A; Inlet end 12B; Sealing surface 121; Sealing element receiving groove 122; Inlet hole 123; Valve core 13; Valve core body 131; Reset element limiting protrusion 1311; Sealing mating surface 1312; Guide surface 1313; Rear guide portion 132; Guide plate portion 1321; Square notch 1322; Secondary high-pressure pump 72; Fixed base 721; Support foot 7211; Hydraulic end 722; Hydraulic end valve box 7221; First main body component 7221A; Second main body component 7221B; Box connecting component 7221C; Cover 7221D; Cover sealing assembly 7221E; High-pressure water inlet channel 72211; High-pressure water inlet 72211a; High-pressure water outlet channel 72212; High-pressure water outlet 72212a; Pressurized channel 7221 3; Outlet valve inspection opening 72213a; Inlet valve inspection opening 72213b; Plunger moving chamber 72214; Front chamber 72214a; Rear chamber 72214b; Freshwater inlet channel 72215; Drainage gas flow channel 72216; High-pressure return channel 72217; Plunger 7122; Plunger cylinder 71221; Plunger fixing component 71222; Plunger base component 71223; Rear end bearing surface 7222A; Front end bearing surface 7222B; Floating connection assembly 7224; Front High-pressure sealing assembly 72251; low-pressure sealing assembly 72252; high-pressure sealing assembly 72253; low-pressure sealing assembly 72254; flow guiding component 7226; power end 723; power end valve box 7231; crankshaft 7232; connecting rod 7233; pump drive mechanism 724; servo motor 7241; gearbox 7242; coupling 7243; coupling housing 7244; accumulator 7251; electronic pressure gauge 7252; mechanical pressure gauge 7253. Detailed Implementation

[0027] To make the technical means, creative features, objectives and effects of this utility model easy to understand, the following describes the one-way valve and the two-stage high-pressure pump of this utility model in detail with reference to the embodiments and accompanying drawings.

[0028] <Example>

[0029] This embodiment provides a one-way valve for use in a two-stage high-pressure pump. The two-stage high-pressure pump is used to form a multi-stage reverse osmosis module. It is installed in the second or subsequent stage of the reverse osmosis module to further pressurize the seawater pressurized by the previous stage high-pressure pump. In other words, the one-way valve in this embodiment operates in a high-pressure seawater environment.

[0030] Figure 1 This is a perspective view of the one-way valve in this embodiment. Figure 2 This is a cross-sectional view of the check valve in this embodiment. Figure 3 This is an exploded view of the one-way valve in this embodiment.

[0031] like Figures 1 to 3 As shown, the one-way valve 10 includes a valve cover 11, a valve seat 12, a valve core 13, and a return spring (not shown in the figure).

[0032] The valve cover 11 is generally cylindrical in shape, with one end being the water outlet 11A. The water outlet 11A is stepped and has a mating protrusion 111 for mating with sealing components, etc. The protrusion 111 is annular and has a through circular water outlet hole 112 in the center. The stepped edge of the water outlet 11A is chamfered to form an annular surface.

[0033] The other end of the valve cover 11 is the mounting end 11B, which is open and has internal threads.

[0034] The valve cover 11 between the outlet end 11A and the mounting end 11B is a cylindrical shape with a uniform outer diameter. Multiple water passage holes 113 are provided on the middle section of the valve cover 11, evenly distributed along the outer circumference of the valve cover 11. In this embodiment, there are six water passage holes. Each water passage hole 113 is a strip-shaped hole with rounded ends. The length of the strip-shaped hole is aligned with the axial direction of the valve cover 11. The width of the strip-shaped hole is less than the distance between two adjacent strip-shaped holes, and the strip-shaped hole does not pass through the internal thread of the mounting end 11B.

[0035] On the inner wall of the valve cover 11, a guide protrusion 114 is formed between two adjacent water passage holes 113, protruding towards the central axis of the valve cover 11. The thickness of the guide protrusion 114 gradually decreases from the inner wall of the valve cover 11 to the central axis, and a spring limiting groove 1141 matching one end of the reset spring is formed between the ends of each guide protrusion 114 that are close to each other.

[0036] The valve seat 12 is generally cylindrical, with one end being a mounting end 12A. The mounting end 12A is annular, and its outer diameter is smaller than the outer diameter of other parts of the valve seat 12. The mounting end 12A has external threads for threaded connection with the mounting end 11B of the valve cover 11. The inner periphery of the outer end of the mounting end 12A has a chamfer to form a sealing surface 121, which is part of a conical surface.

[0037] The other end of the valve seat 12 is the water inlet end 12B. The outer periphery of the water inlet end 12B has a sealing element receiving groove 122, which is an annular groove with a rectangular cross-section for installing a sealing ring.

[0038] The valve seat 12 has a through inlet hole 123 in the middle, and the diameter of the inlet hole 123 is larger than the diameter of the outlet hole 112. One end of the inlet hole 123 has the aforementioned sealing surface 121.

[0039] Figure 4 This is a perspective view of the valve core in this embodiment.

[0040] like Figure 3 and Figure 4 As shown, the valve core 13 is an irregularly shaped part with an axisymmetric structure, which includes an integrally formed valve core body 131 and a rear guide portion 132.

[0041] The valve core body 131 is generally disc-shaped, with a spring-limiting protrusion 1311 at the center of one end. The spring-limiting protrusion 1311 is a flat cylindrical protrusion. The edge of the other end has a sealing mating surface 1312 that matches the sealing surface 121. The sealing mating surface 1312 is also part of a conical surface. A guide surface 1313 is formed around the outer periphery of the valve core body 131. The guide surface 1313 is an annular surface perpendicular to the radial direction of the valve core body 131. The outer diameter of the valve core body 131 (i.e., the outer diameter at the guide surface 1313) is basically the same as the inner diameter of the valve cover 11. The valve core 13 is embedded in the valve cover 11 and can move coaxially relative to the valve cover 11. The guide surface 1313 contacts the inner wall of the valve cover 11, thereby guiding the movement of the valve core 13.

[0042] The rear guide portion 132 extends axially from the middle of one end of the valve core body 131 with the sealing mating surface 1312, and is used to divert and guide the high-pressure seawater, so that the seawater acts on the valve core 13 more evenly along the axial direction of the valve core 13, thereby reducing the vibration generated during the movement of the valve core 13. The rear guide portion 132 includes three guide plate portions 1321. Each guide plate portion 1321 is generally rectangular, and its surface direction is perpendicular to the circumference of the valve core body 131, that is, parallel to the axial direction of the valve core 13. The length direction of each guide plate portion 1321 is consistent with the axial direction of the valve core 13. The included angle between two adjacent guide plate portions 1321 is 120 degrees. One side of the three guide plate portions 1321 in the width direction meets at the central axis of the valve core 13, and an arc transition is formed between two adjacent guide plate portions 1321, making the joint thicker. One end of the guide plate portion 1321 in the length direction is connected to the valve core body 131, and the three guide plate portions 1321 divide the surface of the valve core body 131 into three regions of equal area.

[0043] In addition, a small square notch 1322 is provided on the other side of each guide vane portion 1321 in the width direction (the outer end of the guide vane portion 1321 in the radial direction of the valve core 13) near the valve core body 131.

[0044] The width of each guide plate portion 1321 is smaller than the radius of the inlet hole 123, that is, the diameter of the circumference of the outer ends of the three guide plate portions 1321 in the radial direction of the valve core 13 is smaller than the diameter of the inlet hole 123. When the valve core 13 moves toward the valve seat 12, the rear guide portion 132 is inserted into the inlet hole 123 and does not contact the inner wall of the inlet hole 123.

[0045] The reset spring is used to drive the valve core 13 to move toward the valve seat 12 for reset. In this embodiment, one end of the reset spring is fitted onto the spring limiting protrusion 1311 at one end of the valve core 13, and the other end is embedded in the spring limiting groove 1141 at the top of the valve cover 11. That is, the other end of the spring is held by the end of the multiple flow guiding protrusions 114 that are close to each other.

[0046] When the valve core 13 is pressed against the valve seat 12, the sealing mating surface 1312 and the sealing surface 121 are in contact, thereby blocking the passage between the water inlet hole 123 and the water outlet hole 112. When the valve core 13 moves toward the valve cover 11 and leaves the valve seat 12, an annular channel is formed between the edge of the valve core 13 and the valve seat 12. At this time, the water can enter from the water inlet hole 123 of the valve seat 12, enter the interior of the valve cover 11 after passing through the annular channel, and then flow out through the water outlet hole 112 at one end of the valve cover 11. The water flow is guided by the three guide plates 1321 of the rear guide portion 132 and by the six guide protrusions 114 inside the valve cover 11, thereby making the movement of the valve core 13 more stable.

[0047] According to the assembly structure, when the valve core 13 leaves the valve seat 12, some water can also flow out through one or more water passages 113; when the valve core 13 is pressed against the valve seat 12, water can also enter the valve cover 11 through one or more water passages 113, and then flow out through one or more other water passages 113.

[0048] In this embodiment, both the valve cover 11 and the valve core 13 are made of titanium alloy, such as TC4 titanium alloy. The valve seat 12 may be made of titanium alloy or stainless steel, such as TC4 titanium alloy or 2507 stainless steel. The return spring (spring) is made of stainless steel, such as 2507 stainless steel.

[0049] The following will exemplarily illustrate the application of the above-described one-way valve 10 in a two-stage high-pressure pump.

[0050] Figure 5 This is a perspective view of the secondary high-pressure pump in this embodiment. Figure 6This is a cross-sectional view of the secondary high-pressure pump in this embodiment. Figure 7 yes Figure 6 Enlarged view of the inner part of the middle frame A (including the one-way valve).

[0051] like Figures 5 to 7 As shown, the secondary high-pressure pump 72 includes a fixed base 721, a hydraulic end 722, a power end 723, and a pump drive mechanism 724.

[0052] The hydraulic end 722 is used to input high-pressure seawater, further pressurize it, and output pressurized seawater to the reverse osmosis membrane. The hydraulic end 722 includes a hydraulic end valve box 7221, multiple plungers 7222 (pressurization components), multiple check valves 7223, multiple floating connection assemblies 7224, multiple sets of plunger sealing assemblies 7225, and multiple flow guiding components 7226.

[0053] The hydraulic end valve box 7221 includes a first main body component 7221A, a second main body component 7221B, a box connecting component 7221C, multiple cover pieces 7221D, and multiple cover sealing assemblies 7221E.

[0054] The first main component 7221A and the second main component 7221B are generally rectangular parallelepipeds, while the box connecting component 7221C is generally trapezoidal. The box connecting component 7221C, the second main component 7221B, and the first main component 7221A are sequentially installed at the front end of the power end 723 and secured together by multiple long screws. Multiple cover pieces 7221D and multiple cover sealing assemblies 7221E are respectively provided at multiple openings on the first main component 7221A for sealing and blocking these openings.

[0055] The hydraulic end valve box 7221 internally forms a seawater channel, a freshwater channel, a plunger movement chamber, and a high-pressure return channel. Among them, the seawater channel and the freshwater channel are independent of each other.

[0056] The seawater channel includes a high-pressure inlet channel 72211, a high-pressure outlet channel 72212, and multiple pressurized channels 72213.

[0057] The high-pressure water inlet channel 72211 extends and runs through the hydraulic end valve box 7221 along its length and is located at the lower part of the hydraulic end valve box 7221. Its cross-section is circular, and its two ends are two high-pressure water inlets 72211a located at the lower part of both sides of the hydraulic end valve box 7221.

[0058] The high-pressure outlet channel 72212 extends and penetrates along the length of the first main component 7221A and is located on the upper part of the hydraulic end valve box 7221. Its cross-section is circular, with two high-pressure outlets 72212a located on the upper sides of the hydraulic end valve box 7221 at its two ends. The diameter of the high-pressure outlets 72212a is smaller than the diameter of the high-pressure inlet 72211a. The high-pressure outlets 72212a can be connected to the inlet of the reverse osmosis membrane of this stage via corresponding pipelines.

[0059] Multiple pressurizing channels 72213 are used to pressurize seawater in conjunction with corresponding plungers and check valves. Each pressurizing channel 72213 is roughly "T"-shaped, with its upper end connected to the high-pressure outlet channel 72212, one lower end connected to the high-pressure inlet channel 72211, and its upper end connected to the outside, forming a circular outlet valve maintenance opening 72213a on the upper surface of the hydraulic valve box 7221. The other lower end is also connected to the outside, forming a circular inlet valve maintenance opening 72213b on the front face of the hydraulic valve box 7221. At the maintenance opening, the diameter of the pressurizing channel 72213 increases, forming a larger cylindrical cavity.

[0060] The plunger movable cavity 72214 is used to house the plunger, which extends along the width direction of the first main body component 7221A, and one end is connected to the middle of the corresponding pressurized flow channel 72213.

[0061] The freshwater channel is used in conjunction with the flow guiding component to achieve freshwater lubrication and cooling of the plunger. It includes multiple freshwater inlet channels 72215 and multiple exhaust channels 72216.

[0062] The freshwater inlet channel 72215 extends along the length of the first main component 7221A, from one side of the hydraulic valve box 7221 to near the plunger movable chamber 72214, with one end being the freshwater inlet located on one side of the hydraulic valve box 7221.

[0063] The drain gas flow channel 72216 extends along the height direction of the second main body component 7221B, extending downward from the upper surface of the hydraulic end valve box 7221 to near the plunger moving chamber 72214. The drain gas flow channel 72216 has a circular cross-section, and its diameter is close to that of the fresh water inlet flow channel 72215. One end of it is a drain gas port located on the upper surface of the hydraulic end valve box 7221.

[0064] The high-pressure return channel 72217 is used to provide the further pressurized water pressure to the rear of the plunger 7222. The structure of the plunger 7222 will be described in detail below.

[0065] The plunger 7222 is generally cylindrical and is reciprocatingly disposed in the plunger movable cavity 72214. The plunger 7222 includes a plunger cylinder 72221, a plunger fixing member 72222, and a plunger base member 72223.

[0066] The plunger cylinder 72221 is a hollow cylindrical shape with an axially penetrating mounting hole in the middle. The outer diameter of the front half of the plunger cylinder 72221 is larger than that of the rear half. A stepped structure is formed in the axial middle of the plunger cylinder 72221, and a rear bearing surface 7222A is formed in the axial middle. The rear bearing surface 7222A is a uniformly wide annular surface coaxial with the plunger 7222, that is, the annular surface is perpendicular to the axial direction of the plunger 7222. The outer diameter of the front half of the plunger cylinder 72221 is close to the inner diameter of the plunger's movable cavity, while the outer diameter of the rear half is significantly smaller than the inner diameter of the plunger's movable cavity, forming an annular gap between the rear half and the plunger's movable cavity.

[0067] The plunger base component 72223 is floatingly connected to the power output component of the power end 723 via a floating connection assembly 7224. One end of the plunger base component 72223 has a flange, and the other end is stepped and has a threaded hole in the middle.

[0068] The plunger retainer 72222 is a fixing bolt that passes through the plunger cylinder 72221. One end of its screw is threadedly connected to the plunger base 72223, and its nut is located outside one end of the plunger cylinder 72221, abutting against the outer end face of that end, thereby fixing the plunger cylinder 72221. The outer end face of the plunger base 72223 is a plane, and this plane is perpendicular to the axial direction of the plunger 7222. In this embodiment, the other end of the plunger retainer 72222 opposite to the nut has a flange, and the plunger cylinder 72221 is engaged between the nut and the flange.

[0069] The front end of the plunger 7222 has a front force-bearing surface 7222B. The front force-bearing surface 7222B faces in the opposite direction to the rear force-bearing surface 7222A. The front force-bearing surface 7222B includes the annular surface at the front end of the plunger cylinder 72221 and the plane at the front end (nut end) of the plunger fixing member 72222. The area of ​​the front force-bearing surface 7222B is basically equal to the cross-sectional area of ​​the front half of the plunger 7222.

[0070] In this embodiment, there are three plungers 7222, and correspondingly three pressurized flow channels 72213 and three plunger moving chambers 72214. The three plungers 7222 are arranged at equal intervals along the length of the first main body component 7221A. During operation, the three plungers 7222 alternately reciprocate.

[0071] An inlet valve 7223A is installed at one end of the pressurized flow channel 72213 near the high-pressure inlet flow channel 72211, and an outlet valve 7223B is installed at one end of the pressurized flow channel 72213 near the high-pressure outlet flow channel 72212. Both the inlet valve 7223A and the outlet valve 7223B are the aforementioned one-way valves 10. The inlet valve 7223A is axially horizontal, with its valve seat facing the high-pressure inlet flow channel 72211 and its valve cover facing the inlet valve maintenance opening 72213b. The outlet valve 7223B is axially vertical, with its valve seat facing the middle of the pressurized flow channel 72213 and its valve cover facing the outlet valve maintenance opening 72213a.

[0072] The plunger sealing assembly is used to seal the space between the plunger 7222 and the plunger movable cavity 72214 to prevent seawater from entering the power end 723 through the cavity. The plunger sealing assembly includes a front high-pressure sealing assembly 72251, a front low-pressure sealing assembly 72252, a rear high-pressure sealing assembly 72253, and a rear low-pressure sealing assembly 72254. The front high-pressure sealing assembly 72251 and the front low-pressure sealing assembly 72252 are located between the front half of the plunger 7222 (i.e., the section with the larger outer diameter of the plunger) and the plunger movable cavity 72214, while the rear high-pressure sealing assembly 72253 and the rear low-pressure sealing assembly 72254 are located between the rear half of the plunger 7222 and the plunger movable cavity 72214.

[0073] The plunger sealing assembly divides the plunger moving chamber 72214 into multiple chambers, including a front chamber 72214a located in front of the front high-pressure sealing assembly 72251 and a rear chamber 72214b located between the front low-pressure sealing assembly 72252 and the rear high-pressure sealing assembly 72253.

[0074] The floating connection assembly 7224 includes a spherical component with one surface facing the plunger. When the power output component of the power end 723 moves towards the plunger 7222, it drives the spherical component 72243 to move towards the plunger. The spherical surface abuts against the bottom surface of the plunger and pushes the plunger 7222 to move. The spherical surface ensures that the force provided by the power output component remains on the central axis of the plunger 7222.

[0075] The flow guiding component 7226 is used to guide fresh water to the outer circumferential surface of the plunger cylinder 72221, thereby using fresh water to lubricate and cool the plunger cylinder 72221. The flow guiding component 7226 is annular, with an annular groove in the middle of its outer and inner circumferences, namely the outer circumferential groove and the inner circumferential groove, respectively. It also has multiple radially extending and through-holes that connect the outer circumferential groove and the inner circumferential groove. The outer circumferential groove is connected to the aforementioned fresh water inlet channel 72215 and the exhaust gas flow channel 72216.

[0076] During the plunger's movement, fresh water enters through the fresh water inlet, passes through the fresh water inlet channel 72215, the outer circumferential groove, and the guide hole in sequence, and enters the inner circumferential groove, where it contacts the outer circumferential surface of the plunger cylinder 72221, thereby lubricating and cooling the plunger cylinder 72221. Then, the fresh water can be discharged through the drainage airflow channel 72216 via the guide component 7226 in the same way. If there is air, it can also be discharged through the drainage airflow channel 72216.

[0077] The power end 723 includes a power end valve box 7231 and a crankshaft connecting rod mechanism disposed inside the valve box, including components such as a crankshaft 7232 and a connecting rod 7233, wherein the connecting rod 7233 drives the plunger 7122 to reciprocate through a floating connection assembly 7124.

[0078] The pump drive mechanism 724 includes a servo motor 7241, a gearbox 7242, a coupling 7243, and a coupling housing 7244.

[0079] The gearbox 7242 is fixed on one side of the power end 723. The drive shaft in the gearbox 7242 is directly connected to the crankshaft shaft in the power end 723, and the coupling is external.

[0080] The servo motor 7241 is horizontally mounted on one side of the gearbox 7242, and its output shaft is connected to the drive shaft of the gearbox 7242 via a coupling.

[0081] The high-pressure return channel 72217 in the hydraulic end 722 is L-shaped, with one end connected to the upper end of the pressurized flow channel 72213, and also connected to the high-pressure water outlet flow channel 72212 through the water passage 72231c on the upper part of the water outlet valve 7223B. The other end of the high-pressure return channel 72217 is connected to the rear cavity 72214b of the plunger moving cavity 72214.

[0082] The high-pressure return channel 72217 allows the further pressurized concentrated seawater to flow back to the rear cavity 72214b, so that the high pressure of the pressurized concentrated seawater acts on the rear force surface 7222A of the plunger 7222, thereby balancing the high pressure on the front force surface 7222B of the plunger 7222. This enables the secondary high-pressure pump 72 to pressurize the concentrated seawater to the ideal pressure with less power.

[0083] Taking an input water pressure of 5 MPa and an output water pressure of 10 MPa as an example, by setting the area of ​​the rear force-bearing surface 7222A (annular surface) to half the area of ​​the front force-bearing surface 7222B, the forces on the two force-bearing surfaces can be balanced (the liquid pressures they receive are approximately equal and in opposite directions). At this time, the plunger 7222 only needs to receive an additional force along the required pressure difference (i.e., 5 MPa) in the axial direction, thereby achieving energy saving.

[0084] Figure 8This is a structural diagram of the secondary high-pressure pump under maintenance in this embodiment.

[0085] like Figure 5 and Figure 8 As shown, multiple inlet valve access openings 72213b are located on the front face of the hydraulic valve box 7221. Each inlet valve access opening 72213b is sealed by a cover sealing assembly 7221D and a rectangular plate-shaped cover 7221C is installed by multiple fasteners (bolts). After removing the cover 7221C and the cover sealing assembly 7221D, the inlet valve access opening 72213b can be exposed. The diameter of the inlet valve access opening 72213b and the inlet valve access opening 72213b at one end is compatible with the inlet valve 7223A. Therefore, each inlet valve 7223A can be easily removed through the inlet valve access opening 72213b for inspection and replacement. The outlet valve 7223B is handled similarly.

[0086] In addition, such as Figure 5 As shown, the secondary high-pressure pump 72 is also equipped with an accumulator 7251, an electronic pressure gauge 7252, and a mechanical pressure gauge 7253. The accumulator 7251 is used to stabilize the outlet water pressure. The electronic pressure gauge 7252 and the mechanical pressure gauge 7253 are used to monitor the outlet water pressure and provide a certain degree of redundancy.

[0087] In this embodiment, the plunger cylinder 72221 of the plunger 7222 is made of ceramic material, the first main body component 7221A, the second main body component 7221B and other seawater flow components are all made of 2507 stainless steel, and the cover 7221D and its fixing components and other auxiliary non-seawater flow components can be made of 316L stainless steel.

[0088] In this embodiment, the concentrated seawater pressure output by the first-stage reverse osmosis module is 5 MPa to 7 MPa, which means the pressure of the high-pressure concentrated seawater input to the second-stage high-pressure pump 72 is 5 MPa to 7 MPa, and the pressure of the high-pressure concentrated seawater output by the second-stage high-pressure pump 72 is 10 MPa to 12 MPa, which is the approximate range of water pressure that the one-way valve 10 needs to withstand.

[0089] The role and effect of the embodiments

[0090] According to the one-way valve and secondary high-pressure pump provided in this embodiment, the one-way valve includes a valve cover, a valve seat, and a valve core. Since the valve core is made of titanium alloy, it is not easily corroded by seawater. Even with high-frequency operation in a high-flow, high-pressure secondary high-pressure pump, the valve core is not prone to wear, thereby increasing the service life of the one-way valve and reducing the frequency of maintenance of the secondary high-pressure pump. Furthermore, one end of the valve core has a rear guide portion, which can divert and guide the high-pressure seawater entering from the inlet hole on the valve seat. This allows the high-pressure seawater to act more evenly on the force-bearing surface of that end of the valve core, and ensures that the high-pressure seawater impacts the valve core along the axial direction of the one-way valve as much as possible. This guides the movement of the valve core, maintaining its axial motion, thus avoiding vibration and component wear, further improving the service life of the one-way valve.

[0091] In this embodiment, the valve cover is also made of titanium alloy, and the valve seat is made of stainless steel, so it is not easily corroded by seawater, which enables the one-way valve to work better in the seawater environment and has a longer service life.

[0092] Furthermore, multiple water passage holes are also provided in the axial center of the valve cover. Therefore, depending on the assembly structure (the flow channel structure where the one-way valve is located), the one-way valve can not only realize water intake through the inlet hole and water output through the outlet hole, but also realize the discharge of some seawater through the water passage holes, or the discharge of seawater through some water passage holes and other water passage holes. With the specific flow channel structure, more functions can be realized.

[0093] Furthermore, the distance between two adjacent water passages is greater than the width of the water passage, which makes the impact of the water passage on the overall structural strength of the valve cover relatively small.

[0094] Furthermore, the inner wall of the valve cover between two adjacent water passages has a flow-guiding protrusion, which guides the seawater flowing into the valve cover, allowing it to be discharged more stably. The flow-guiding protrusion also serves to hold and fix one end of the return spring, making the valve cover structure more compact.

[0095] Furthermore, the outer periphery of the valve core body has a guide surface perpendicular to its radial direction, which can maintain contact with the inner circumferential surface of the valve cover when the valve core moves, thereby providing movement guidance for the valve core and further improving its stability.

[0096] Furthermore, one end of the water outlet has a sealing surface, and the edge of the valve core body has a matching sealing mating surface. Both the sealing surface and the sealing mating surface are part of a conical surface. Therefore, when the valve core is pressed towards the valve seat, the sealing surface and the sealing mating surface can self-center and fit together to achieve a good sealing effect.

[0097] In the embodiment, the one-way valve is used in the plunger-type two-stage high-pressure pump. It is used as the outlet valve and the inlet valve at both ends of the pressurization channel, respectively. It can cooperate with the plunger to further pressurize the high-pressure seawater and avoid the backflow of seawater at the high-pressure inlet.

[0098] In this embodiment, the rear end force-bearing surface of the plunger is annular. By designing the area of ​​the rear end force-bearing surface and the front end force-bearing surface, the liquid pressure at the front end of the plunger and the liquid pressure at the rear annular surface are kept in force balance. At this time, the plunger only needs the axial force required to increase the pressure difference, which has a significant energy-saving effect compared to the scheme without a high-pressure return channel.

[0099] Furthermore, the pump drive mechanism of the secondary high-pressure pump includes a servo motor and a gearbox. Compared with asynchronous motors, the servo motor is smaller in size and can achieve high-precision control. Therefore, the secondary high-pressure pump is significantly smaller in size while maintaining the ideal flow rate, and can achieve a fast and accurate response when the system operating conditions change. This makes the concentrated seawater output by the reverse osmosis module stable, which is conducive to the stable and efficient production of edible salt.

[0100] In this embodiment, a flow guiding component is also provided on the plunger, which can guide fresh water to the outer circumferential surface of the plunger through its flow guiding channel. This allows the fresh water to be used to lubricate and cool the plunger, avoiding the problem of microcrystals and wear of components such as the plunger when using seawater. This can further improve the service life of components such as the plunger and reduce the frequency of maintenance by workers.

[0101] Furthermore, the flow guiding component has an outer circumferential groove, an inner circumferential groove, and multiple flow guiding holes. These holes allow fresh water to be supplied dispersedly into the inner circumferential groove and into contact with the outer circumferential surface of the plunger cylinder, thus providing more uniform lubrication and cooling to the plunger cylinder. The fresh water inlet channel, which works in conjunction with the flow guiding component, supplies fresh water horizontally from one side, while the air venting channel extends vertically upwards to the top of the valve box. This allows air to be automatically discharged through the air venting channel, preventing air accumulation inside the valve box and ensuring proper plunger operation.

[0102] Furthermore, the plunger and crankshaft connecting rod are connected via a floating connection assembly. When the connecting rod moves forward, the spherical surface pushes against the outer end face of the plunger base. Due to dimensional tolerances in the components, it is difficult to ensure that the crankshaft connecting rod and plunger are always coaxial. Using a conventional fixed connection method, dimensional tolerances will lead to some eccentricity, resulting in greater vibration and plunger wear. However, in the embodiment, by using the spherical surface to push the plunger, it is ensured that the force of the crankshaft connecting rod always acts on the central axis of the plunger, further reducing vibration and increasing the plunger's service life.

[0103] Furthermore, the plunger cylinder is made of ceramic material, and the valve core of the one-way valve is made of titanium alloy. This not only prevents these components from being corroded by seawater, but also reduces the wear of these high-frequency moving parts, thereby reducing the frequency of maintenance. In the hydraulic end, the seawater flow parts are made of 2507 stainless steel, and the auxiliary non-flow parts are made of 316L stainless steel, which enables the system to operate stably for a longer period of time and keeps the overall cost of the secondary high-pressure pump low.

[0104] Furthermore, each of the inlet and outlet valves has a corresponding inspection opening on one side. Removing the corresponding cover and sealing assembly exposes the inspection opening, allowing for convenient inspection or replacement of the inlet and outlet valves. Additionally, the first main component can be completely disassembled, exposing at least the tip of the plunger, facilitating easy inspection or replacement of the plunger cylinder. These designs enable convenient inspection and replacement of frequently operating and relatively wear-prone components such as check valves and plunger cylinders, thereby reducing the frequency of the secondary high-pressure pump requiring complete factory overhaul.

[0105] The above embodiments are merely illustrative of specific implementations of this utility model, and the utility model is not limited to the scope of the above embodiments. Those skilled in the art should understand that the utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are only for illustrating the principles of the utility model. Various changes and modifications can be made to the utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the utility model as claimed. The scope of protection of this utility model is defined by the appended claims and their equivalents.

[0106] For example, in the above embodiment, since it is used in a high-pressure environment of up to 12 MPa, the valve cover 11 and valve core 13 of the one-way valve 10 are both made of titanium alloy. When the water pressure is relatively lower, the valve core 13 can also be made of titanium alloy, and the valve cover 11 can be made of other materials, such as stainless steel.

[0107] In the above embodiment, the rear guide portion 132 of the valve core 13 has three guide plate portions 1321. In an alternative embodiment, the rear guide portion 132 may also have more than three guide plate portions 1321.

[0108] In the above embodiment, the one-way valve 10 is used in the plunger-type secondary high-pressure pump 72 as an inlet valve and an outlet valve, and works with the plunger to further pressurize the seawater. In an alternative, the one-way valve 10 can also be used in other types of secondary high-pressure pumps, or in other high-pressure seawater environments.

Claims

1. A one-way valve, installed in a two-stage high-pressure pump for pressurizing seawater, wherein the seawater input to the two-stage high-pressure pump is seawater pressurized by the preceding high-pressure pump, characterized in that, include: Valve cover with water outlet; The valve seat, fixed to one end of the valve cover, has a water inlet hole; and A valve core, movably disposed within the valve cover, is used to connect or block the water outlet and the water inlet. The valve core is made of titanium alloy. One end of the valve core faces the valve cover, and the other end has a rear guide portion for diverting and guiding the seawater entering through the water inlet, thereby guiding the valve core.

2. The one-way valve according to claim 1, characterized in that: in, The valve cover is made of titanium alloy. The valve seat is made of stainless steel.

3. The one-way valve according to claim 1, characterized in that: in, The valve cover is cylindrical in the axial center and has multiple water passage holes. The water passage hole is a strip-shaped hole with round ends, and its length direction is consistent with the axial direction of the valve cover. Multiple water passage holes are evenly distributed along the periphery of the valve cover.

4. The one-way valve according to claim 3, characterized in that: in, The inner wall of the valve cover between two adjacent water passages has a guide protrusion that protrudes towards the central axis of the valve cover, for guiding the seawater flowing into the valve cover. The valve core also has a valve core body integrally formed with the rear guide portion. The valve core body is disc-shaped, and the rear guide portion includes multiple plate-shaped guide plate portions. One end of each guide plate portion is connected to the valve core body, and the multiple guide plate portions divide the surface of the valve core body into multiple regions of equal area.

5. The one-way valve according to claim 4, characterized in that: in, The guide plate is rectangular in shape, and its surface direction is parallel to the axial direction of the valve core body. The flow guide plate consists of three parts, with one side of each of the three flow guide plates connected at the central axis of the valve core, and the included angle between two adjacent flow guide plate parts is 120 degrees.

6. The one-way valve according to claim 4, characterized in that: in, The outer periphery of the valve core body has a guide surface that is perpendicular to the radial direction of the valve core body and contacts the inner peripheral surface of the valve cover, thereby providing guidance when the valve core moves within the valve cover.

7. The one-way valve according to claim 4, characterized in that: in, The end of the water outlet facing the valve cover has a sealing surface, which is part of a conical surface. The valve core body has a sealing mating surface at one end facing the valve seat that matches the sealing surface.

8. The one-way valve according to claim 4, characterized in that, Also includes: A return spring is used to drive the valve core to move toward the valve seat. The valve core has a spring-limiting protrusion at the center of one end facing the valve cover. The reset spring is disposed inside the valve cover, with one end fitted onto the spring limiting protrusion and the other end located between and held by the plurality of flow guiding protrusions.

9. A two-stage high-pressure pump, characterized in that, include: The hydraulic end features a seawater channel, a check valve, and pressurization components. The one-way valve is disposed in the seawater channel and is used in conjunction with the pressurizing component to pressurize the seawater in the seawater channel. The one-way valve is the one-way valve according to any one of claims 1-8.

10. The two-stage high-pressure pump according to claim 9, characterized in that: in, The pressurizing component is a plunger. The seawater channel has a high-pressure inlet and a high-pressure outlet. There are multiple one-way valves, which are used as inlet valves and outlet valves respectively, and are respectively installed next to the high-pressure inlet and the high-pressure outlet.

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