Check Valve, Liquid Inlet Flange, Piston Pump and Application of Check Valve in Liquid Hydrogen Pump

Abstract

The present application discloses a check valve, a liquid inlet flange, a piston pump, and the application of the check valve in a liquid hydrogen pump. The check valve includes: a limit frame, the limit frame includes a limit body and at least two support legs evenly distributed on the limit body, and there is a gap between adjacent support legs; the limit body is disposed opposite to the position to be sealed; a valve body, the valve body can reciprocate between the limit body and the position to be sealed. The present application discloses a check valve, a liquid inlet flange, a piston pump, and the application of the check valve in a liquid hydrogen pump to solve the problem of slow response speed of a one-way valve or a check valve.

Description

Technical Field

[0001] The present application relates to the technical field of driving devices, and more specifically, to a check valve, a liquid inlet flange, a piston pump, and the application of the check valve in a liquid hydrogen pump. Background Art

[0002] A liquid hydrogen pump includes a hydraulic end and a driving end. The hydraulic end is placed inside a liquid hydrogen storage tank and immersed in liquid hydrogen; the driving end is placed outside the liquid hydrogen storage tank. The hydraulic end is of a hydraulic cylinder structure. During the process of sucking liquid hydrogen, the inlet check valve opens and the outlet check valve closes; while during the process of compressing liquid hydrogen, the inlet check valve closes and the outlet check valve opens. In this way, under the push of the piston, liquid hydrogen is transported out through the outlet check valve in a high-pressure state. The existing check valve has a relatively long moving distance and a relatively complex structure, resulting in a slow response speed.

[0003] Therefore, a check valve, a liquid inlet flange, a piston pump, and the application of the check valve in a liquid hydrogen pump are needed to solve the above problems. Summary of the Invention

[0004] In view of this, the purpose of the present application is to propose a check valve, a liquid inlet flange, a piston pump, and the application of the check valve in a liquid hydrogen pump to solve the problem of slow response speed of the check valve or one-way valve.

[0005] Based on the above purpose, a check valve provided by the present application includes:

[0006] A limit frame, the limit frame includes a limit body and at least two support legs evenly distributed on the limit body, and there is a gap between adjacent support legs; the limit body is disposed opposite to the position to be sealed;

[0007] A valve body, the valve body can reciprocate between the limit body and the position to be sealed.

[0008] Optionally, a flange is provided at one end of the support leg away from the limit body, and a fixing member is provided on the flange, and the fixing member is used to connect the flange to the outer periphery of the position to be sealed.

[0009] Optionally, at least one through hole penetrating along the axial direction is provided on the limit body.

[0010] Optionally, the valve body includes a main body and a lapping edge formed around the main body. The main body includes a sealing surface, the sealing surface protrudes toward the side of the position to be sealed and can at least partially enter the position to be sealed, and the lapping edge can lap on the edge of the position to be sealed.

[0011] Optionally, the thickness at the center of the main body is greater than the thickness of the lapping edge.

[0012] Optionally, the valve body further includes a pressure-bearing surface, the sealing surface is arranged opposite to the pressure-bearing surface, and the distance between the sealing surface and the pressure-bearing surface gradually increases to the center of the main body and then gradually decreases.

[0013] Optionally, a gap is provided between the overlapping edge and the support leg.

[0014] Optionally, at least two uniformly distributed moving channels are provided on the overlapping edge, and the moving channels are in clearance fit with the support legs.

[0015] This application also provides a liquid inlet flange, including:

[0016] A check valve as described above;

[0017] A liquid inlet flange main body, an inlet channel is provided on the liquid inlet flange main body, the check valve is connected to the liquid inlet flange main body and can open and close the inlet channel.

[0018] This application also provides a piston pump, including:

[0019] A check valve as described above;

[0020] A liquid inlet flange main body, an inlet channel is provided on the liquid inlet flange main body; the check valve is connected to the liquid inlet flange main body;

[0021] A hydraulic cylinder, the liquid inlet flange main body is connected to the hydraulic cylinder, the hydraulic cylinder includes a receiving cavity, and the inlet channel communicates with the receiving cavity;

[0022] A piston, the piston is movably arranged in the receiving cavity and can approach or move away from the liquid inlet flange main body; the check valve can open and close the inlet channel to connect or cut off the inlet channel and the receiving cavity.

[0023] In addition, optionally, an avoidance hole is provided at one end of the piston facing the check valve, and at least a part of the check valve enters the avoidance hole.

[0024] This application also provides an application of the check valve as described above in a liquid hydrogen pump.

[0025] As can be seen from the above, the check valve, the liquid inlet flange, the piston pump, and the application of the check valve in the liquid hydrogen pump provided by the present application have the following advantages compared with the prior art: By adopting the above check valve, the fluid force pushes the valve body away from the position to be sealed. When the hydraulic cylinder is filled with liquid, the limit frame limits the maximum moving position of the valve body, shortening and reducing the moving distance of the valve body in the hydraulic cylinder. Moreover, when the hydraulic cylinder stops filling with liquid, the valve body resets to the position to be sealed due to gravity; the pressure in the hydraulic cylinder can be transmitted to the valve body through liquid hydrogen. Under the combined action of the downward pressure and gravity, the valve body provides sufficient sealing pressure to achieve the sealing and check functions. And the check valve has a simple structure, reducing the driving difficulty and improving the response speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above features and technical advantages of the present application will become clearer and easier to understand through the following description of its embodiments in conjunction with the drawings.

[0027] Figure 1 Schematic diagram of the closed state of the check valve adopted in the first embodiment of the present application.

[0028] Figure 2 is Figure 1 Schematic diagram of the open state of the check valve shown.

[0029] Figure 3 is Figure 1 Schematic diagram of the state of cooperation between the check valve and the piston shown.

[0030] Figure 4 is Figure 1 Schematic diagram of the valve body shown.

[0031] Figure 5 is Figure 4 Side view of the valve body shown.

[0032] Figure 6 is Figure 1 Schematic diagram of the limit frame shown.

[0033] Figure 7 is Figure 6 Side view of the limit frame shown.

[0034] Figure 8 Schematic diagram of the state of cooperation between the check valve and the piston adopted in the second embodiment of the present application.

[0035] Figure 9 is Figure 8 Schematic diagram of the valve body shown.

[0036] Figure 10 Schematic diagram of the closed state of the check valve and the piston adopted in the third embodiment of the present application.

[0037] Figure 11 Figure 10 Schematic diagram of the open state of the check valve shown

[0038] Figure 12 is Figure 10 Schematic diagram of the mating state of the check valve and the piston shown

[0039] Figure 13 is Figure 10 Schematic diagram of the valve body shown

[0040] Figure 14 is Figure 13 Side view of the valve body shown

[0041] Wherein the reference numerals are as follows

[0042] 1. Inlet flange main body; 1-1. First inlet flange main body; 2. Hydraulic cylinder; 3. Piston; 4. Valve body; 4-1. First valve body; 5. Limiting frame; 51. Limiting body; 52. Bolt hole; 53. Through hole Specific embodiments

[0043] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further describes the present application in detail with reference to specific embodiments and the accompanying drawings. The same components are denoted by the same reference numerals. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings. The terms "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific component

[0044] Figure 1 Schematic diagram of the closed state of the check valve adopted in the first embodiment of the present application Figure 2 is Figure 1 Schematic diagram of the open state of the check valve shown Figure 3 is Figure 1 Schematic diagram of the mating state of the check valve and the piston shown Figure 4 is Figure 1 Schematic diagram of the valve body shown Figure 5 is Figure 4 Side view of the valve body shown Figure 6 is Figure 1 Schematic diagram of the limiting frame shown Figure 7 is Figure 6 Side view of the limiting frame shown. As Figures 1 to 7 shown, the check valve includes a limiting frame 5 and a valve body 4

[0045] The limit frame 5 includes a limiting body and at least two support legs evenly distributed on the limiting body, with a gap provided between adjacent support legs; the limiting body is disposed opposite to the position to be sealed; the limit frame 5 is connected to the outer periphery of the position to be sealed, and is used to limit the maximum moving displacement of the valve body 4. For example, the limit frame 5 is connected to the outer periphery of the position to be sealed through the support legs, so that the limit frame 5 covers the outside of the position to be sealed, and the installation position of the support legs will not damage the sealing effect. There is a gap for liquid hydrogen to pass through between adjacent support legs, which is convenient for the flow of liquid hydrogen.

[0046] The valve body 4 can reciprocate between the limiting body and the position to be sealed. Generally, the valve body 4 is disposed within the limit frame 5, and the valve body 4 abuts against the position to be sealed to achieve the sealing function; the valve body 4 moves away from the position to be sealed to achieve the unsealing function.

[0047] The liquid inlet flange body 1 is connected between the hydraulic cylinder 2 and the liquid hydrogen storage tank. The liquid inlet flange body 1 is provided with a liquid inlet channel, and the liquid inlet channel includes an inlet end and an outlet end. The inlet end is communicated with the liquid hydrogen storage tank, and the outlet end is communicated with the hydraulic cylinder 2. For example, the position to be sealed is the outlet end of the liquid inlet channel, and the check valve is disposed at the position to be sealed. When feeding liquid, the check valve is opened by the fluid force when the piston 3 moves upward to suck liquid hydrogen; that is, when the hydraulic cylinder 2 starts to suck liquid hydrogen, the piston 3 in the hydraulic cylinder 2 is at the relatively lower end of the hydraulic cylinder 2 and starts to move upward. The internal pressure of the hydraulic cylinder 2 gradually decreases until the fluid force pushes the valve body 4 to move upward, and the valve body 4 unseals the position to be sealed. The limit frame 5 limits the maximum displacement of the valve body 4, and the liquid hydrogen automatically presses into the hydraulic cylinder 2 after passing through the valve body 4. When the piston 3 reaches the top end of the hydraulic cylinder 2, the liquid hydrogen no longer flows into the hydraulic cylinder 2, and the valve body 4 falls back under the action of gravity, and the valve body 4 seals the position to be sealed. When the piston 3 moves downward to compress the liquid hydrogen in the hydraulic cylinder 2, the pressure in the hydraulic cylinder 2 is transmitted to the valve body 4 by the filled liquid hydrogen, so that sufficient sealing pressure is generated between the valve body 4 and the position to be sealed, realizing the sealing and check functions.

[0048] With the above check valve, the fluid force pushes the valve body 4 away from the position to be sealed. When the hydraulic cylinder feeds liquid, the limit frame 5 limits the maximum moving position of the valve body 4, shortening and reducing the moving distance of the valve body 4 in the hydraulic cylinder 2. Moreover, when the hydraulic cylinder 2 stops feeding liquid, the valve body 4 resets to the position to be sealed due to gravity; the pressure in the hydraulic cylinder 2 can be transmitted to the valve body 4 through the liquid hydrogen. Under the combined action of the downward pressure and gravity, the valve body 4 provides sufficient sealing pressure to realize the sealing and check functions. And the check valve has a simple structure, reducing the driving difficulty and improving the response speed.

[0049] In an embodiment of the present application, the limit frame 5 and / or the valve body 4 are made of a metal material resistant to hydrogen corrosion, improving the corrosion resistance and extending the service life of the check valve.

[0050] In one embodiment of the present application, the limiting frame 5 includes multiple (such as 6 to 8) support legs. The multiple support legs are evenly distributed along the circumferential direction of the limiting body 51. The limiting body 51 and the support legs enclose a limiting cavity, and the limiting cavity is a non-closed cavity. There are gaps between adjacent support legs for fluid to pass through.

[0051] Optionally, a flange is provided at one end of the support leg away from the limiting body, and a fixing member is provided on the flange. The fixing member is used to connect the flange to the outer periphery of the position to be sealed. By providing the flange, the contact area between the support leg and the outer periphery of the position to be sealed is increased, and the installation stability of the limiting frame 5 is increased.

[0052] In one embodiment of the present application, the flange extends towards the side away from the limiting cavity to avoid blocking the position to be sealed. A bolt hole 52 is provided on the flange. The fixing member includes, but is not limited to, common parts such as bolts and screws. The fixing member passes through the bolt hole 52 and fixes the flange.

[0053] Optionally, at least one through hole penetrating along the axial direction is provided on the limiting body. Generally, the through hole 53 is disposed opposite to the position to be sealed. The valve body 4 is located between the through hole 53 and the position to be sealed. Liquid hydrogen can act on the valve body 4 through the through hole 53 to provide a downward pressure for the valve body 4. In addition, the local piston 3 can enter the limiting frame 5 through the through hole 53, and the check valve and the piston 3 are mutually engaged within a small range, which can reduce the requirement for the volume of the hydraulic cylinder 2.

[0054] In one embodiment of the present application, the diameter of the through hole 53 is larger than the diameter of the position to be sealed, and the diameter of the valve body 4 is larger than the diameter of the through hole 53.

[0055] In one embodiment of the present application, the through hole 53 is provided on the limiting body 51. The limiting cavity covers the outside of the position to be sealed, and the support legs are connected to the outer periphery of the position to be sealed through the flange; the valve body 4 reciprocates within the limiting cavity. The limiting cavity is communicated with the position to be sealed, and the limiting cavity is communicated with the hydraulic cylinder 2 through the through hole 53. The valve body 4 reciprocates within the limiting cavity, and the maximum moving position is up to abut against the limiting body 51. By adopting the above-mentioned limiting frame 5, the structure is relatively simple and compact, occupies a small space, and is easy to install.

[0056] Optionally, the valve body includes a main body and a lapping edge formed around the main body. The main body includes a sealing surface, and the sealing surface protrudes towards the side of the position to be sealed. When the position to be sealed is the port of the liquid inlet channel, the sealing surface can at least partially enter the port of the liquid inlet channel, and the lapping edge can lap on the edge of the position to be sealed. The main body laps on the edge of the position to be sealed through the peripheral lapping edge, and the main body is sealed to the position to be sealed through the sealing surface. The sealing surface partially enters the position to be sealed, which can not only ensure the sealing effect through insertion sealing, but also realize self-positioning during the reciprocating movement.

[0057] In an embodiment of the present application, the valve body 4 is in the shape of a disc protruding to one side. The protruding part is the main body, the convex surface of the protruding part is the sealing surface, and the part surrounding the protruding part is the overlapping edge.

[0058] Optionally, the thickness at the center of the main body is greater than the thickness of the overlapping edge. The thickness of the main body can generally be the same or different. When the thickness of the main body is different, the thickness at the center of the main body is the largest, and the thickness of the main body is set according to the pressure it bears; the thickness of the overlapping edge is generally the same, and the thickness of the overlapping edge is set to meet the requirements of sealing and structural strength. By setting different thicknesses, that is, when the overlapping edge overlaps the edge of the position to be sealed, increasing the thickness at the center of the main body can ensure the sealing performance of the valve body 4 for the position to be sealed, achieve self-positioning during the reciprocating movement, and at the same time reduce the thickness of the overlapping edge to meet the sealing performance requirements and avoid deformation.

[0059] In an embodiment of the present application, the thickness at the center of the main body is 1.5 - 3 times the thickness of the overlapping edge.

[0060] Optionally, the valve body 4 further includes a pressure-bearing surface, the sealing surface and the pressure-bearing surface are arranged opposite to each other, and the distance between the sealing surface and the pressure-bearing surface gradually increases to the center of the main body and then gradually decreases. The pressure-bearing surface is used to bear the downward pressure provided by liquid hydrogen or the piston 3. The pressure-bearing surface can be a horizontal surface, flush with the upper surface of the overlapping edge, or both the sealing surface and the pressure-bearing surface are arc-shaped surfaces protruding to the same side. It should be ensured that the distance between the sealing surface and the pressure-bearing surface gradually increases to the center of the main body and then gradually decreases to ensure that the thickness at the center of the main body is the largest. By setting the thickness and shape of the valve body 4, the sealing performance of the valve body 4 for the position to be sealed can be ensured, self-positioning during the reciprocating movement can be achieved, which helps to realize the gravity self-positioning of the valve body 4, enables the central part of the main body to enter the position to be sealed, and realizes plug-in sealing.

[0061] In an embodiment of the present application, the main body includes a pressure-bearing surface and a sealing surface arranged opposite to each other. The pressure-bearing surface is arranged opposite to the through hole 53, and the sealing surface protrudes away from the pressure-bearing surface. Liquid hydrogen can act on the pressure-bearing surface through the through hole 53.

[0062] Figure 8 It is a schematic diagram of the cooperation state of the check valve and the piston adopted in the second embodiment of the present application. Figure 9 is Figure 8 a schematic diagram of the shown valve body. As Figure 8 、 Figure 9 shown, the valve body 4 adopts the first valve body 4-1, and the shape of the first valve body 4-1 is different from the shape of the valve body 4 in the first embodiment.

[0063] The first valve body 4-1 has a symmetrical structure. The closer it is to the center of the main body, the greater the distance between the sealing surface and the pressure-bearing surface, that is, the greater the thickness. The closer it is to the edge of the main body, the smaller the distance between the sealing surface and the pressure-bearing surface, that is, the thinner the thickness. In an embodiment of the present application, the pressure-bearing surface of the first valve body 4-1 is a plane, and the sealing surface of the first valve body 4-1 is an arc surface.

[0064] Optionally, a gap is provided between the overlapping edge and the support leg. The gap should not affect the reciprocating movement of the valve body 4, and at the same time, it should ensure the effective limit of the valve body 4 to avoid large-scale displacement. By setting the gap, the overlapping edge does not rub against the support leg during the movement process, reducing the driving difficulty of the valve body 4 and improving the response speed of the valve body 4.

[0065] Optionally, at least two uniformly distributed moving channels are provided on the overlapping edge, and the moving channels are in clearance fit with the support legs. The moving channels are sleeved on the support legs, enabling the overlapping edge to reciprocate along the support legs through the moving channels. The support legs provide a guiding function for the overlapping edge, and the clearance fit can reduce the friction between the overlapping edge and the support legs, ensuring the response speed of the valve body 4.

[0066] In an embodiment of the present application, if the support legs are cylindrical, the moving channels can be in the shape of waist holes.

[0067] Figure 10 It is a schematic diagram of the check valve and the piston in the closed state adopted in the third embodiment of the present application. Figure 11 Figure 10 A schematic diagram of the open state of the shown check valve. Figure 12 For Figure 10 A schematic diagram of the cooperation state of the shown check valve and the piston. Figure 13 For Figure 10 A schematic diagram of the shown valve body. Figure 14 For Figure 13 A side view of the shown valve body. As Figures 10 to 14 Shown, the valve body 4 adopts the second valve body 4-2, and the shape of the second valve body 4-2 is different from the shape of the valve body 4 in the first embodiment. The shape of the liquid inlet flange main body 1 adopts the first liquid inlet flange main body 1-1, which is different from the shape of the liquid inlet flange main body 1 in the first embodiment, the first liquid inlet flange main body 1-1.

[0068] The main body and the edges on both sides are an integrally formed structure, that is, there is no obvious bend between the main body and the edges, but a smooth transition. The second valve body 4-2 has a symmetrical structure. The closer it is to the center of the main body, the greater the distance between the sealing surface and the pressure-bearing surface, that is, the greater the thickness. The closer it is to the edge, the smaller the distance between the sealing surface and the pressure-bearing surface, and the smaller the distance between the overlapping edge and the pressure-bearing surface, that is, the thinner the thickness.

[0069] The first liquid inlet flange body 1-1 is provided with a liquid inlet channel, which includes an inlet end and an outlet end. The inlet end is communicated with the liquid hydrogen storage tank, and the outlet end is communicated with the hydraulic cylinder 2. If the position to be sealed is the outlet end of the liquid inlet channel, the check valve is arranged at the position to be sealed. In order to achieve good cooperation with the second valve body 4-2, the end face of the outlet end is provided with an arc surface, and the arc surface is a gradually changing surface, that is, the diameter of the arc surface gradually increases from the side of the inlet end to the side of the outlet end; and the arc surface coincides with the edge of the second valve body 4-2, that is, when the second valve body 4-2 is in the closed state, the main body enters the liquid inlet channel, and the edge overlaps on the arc surface, realizing the self-positioning function under the action of gravity and effectively sealing the outlet end.

[0070] In addition, the arc surface of the outlet end is inclined downward, and solid impurities in the liquid hydrogen are not easy to deposit and stay on the arc surface, which can realize the self-cleaning function and enable the second valve body 4-2 to achieve efficient and reliable sealing.

[0071] Generally, in order to ensure that the valve body 4 can be normally sealed and unsealed and realize the self-positioning function, the distance between the two ends of the valve body 4, the second valve body 4-1, and the second valve body 4-2 (that is, the distance between the two side edges) should be greater than the diameter of the inlet channel, and the distance between the two ends of the valve body 4, the second valve body 4-1, and the second valve body 4-2 is less than the distance between the limit frame 5 and the position to be sealed.

[0072] The following further introduces the use process of the check valve.

[0073] The liquid inlet flange body 1 is connected between the hydraulic cylinder 2 and the liquid hydrogen storage tank. A liquid inlet channel is provided on the liquid inlet flange body 1. The liquid inlet channel includes an inlet end and an outlet end. The inlet end is communicated with the liquid hydrogen storage tank, and the outlet end is communicated with the hydraulic cylinder 2. If the position to be sealed is the outlet end of the liquid inlet channel, a check valve is arranged at the position to be sealed. A limiting frame 5 covers the outside of the position to be sealed. The limiting frame 5 is connected to the outside of the position to be sealed through support legs, so that the limiting body is arranged opposite to the position to be sealed. The valve body 4 abuts against the position to be sealed through a sealing surface. When feeding liquid, the check valve is opened by the fluid force when the piston 3 moves upward to suck liquid hydrogen; that is, when the hydraulic cylinder 2 starts to inhale liquid hydrogen, the piston 3 in the hydraulic cylinder 2 is at the relatively lower end of the hydraulic cylinder 2 and starts to move upward. The pressure inside the hydraulic cylinder 2 gradually decreases. Until the valve body 4 moves upward, the sealing surface of the valve body 4 leaves the position to be sealed, realizing unsealing of the position to be sealed. The limiting body limits the maximum displacement of the valve body 4, reducing the moving distance of the valve body 4. The liquid hydrogen automatically presses into the hydraulic cylinder 2 through the gap between the support legs after passing through the valve body 4. When the piston 3 reaches the top end of the hydraulic cylinder 2, the liquid hydrogen no longer flows into the hydraulic cylinder 2, and the valve body 4 falls back under the action of gravity, and the valve body 4 seals the position to be sealed. When the piston 3 moves downward to compress the liquid hydrogen in the hydraulic cylinder 2, the pressure in the hydraulic cylinder 2 is transmitted to the valve body 4 by the filled liquid hydrogen from the through holes 53 and the gap between the support legs. Under the action of the self-gravity of the valve body 4 and the downward pressure received, sufficient sealing pressure is generated between the valve body 4 and the position to be sealed, realizing the sealing and check functions.

[0074] The present application also provides a liquid inlet flange, including: a check valve and the liquid inlet flange body 1.

[0075] The liquid inlet flange includes the check valve as described above. The check valve can adopt the check valve in any of the above embodiments, which will not be elaborated here.

[0076] A liquid inlet channel is provided on the liquid inlet flange body 1. The check valve is connected to the liquid inlet flange body 1 and can open and close the liquid inlet channel. The liquid inlet flange body 1 is connected between the hydraulic cylinder 2 and the liquid hydrogen storage tank. The liquid inlet channel includes an inlet end and an outlet end. The inlet end is communicated with the liquid hydrogen storage tank, and the outlet end is communicated with the hydraulic cylinder 2. Feeding liquid means that the liquid hydrogen provided by the liquid hydrogen storage tank enters the liquid inlet flange body 1 through the inlet end and enters the hydraulic cylinder 2 through the outlet end.

[0077] The check valve includes a limiting frame 5 and a valve body 4. The limiting frame 5 is connected to the liquid inlet flange body 1. The valve body 4 is arranged between the liquid inlet flange body 1 and the limiting frame 5. The limiting frame 5 is used to limit the maximum moving distance of the valve body 4. The liquid inlet channel includes an inlet end and an outlet end. The valve body 4 is arranged on one side of the outlet end. The valve body 4 abuts against the outlet end, the liquid inlet channel is closed, and the liquid inlet and outlet stop; the valve body leaves the outlet end and moves toward the side where the limiting frame 5 is located, the liquid inlet channel is opened, and the liquid inlet channel can feed liquid.

[0078] With the above-mentioned liquid inlet flange, the check valve has a simple structure and a fast response speed, and can quickly open and close the liquid inlet channel of the liquid inlet flange body.

[0079] In an embodiment of the present application, a liquid inlet channel is provided in the axial direction of the liquid inlet flange body 1, and a liquid outlet channel is provided in the radial direction of the liquid inlet flange body 1. The liquid outlet channel is communicated with the liquid inlet channel.

[0080] In an embodiment of the present application, the liquid inlet flange body 1 is detachably connected to the hydraulic cylinder 2, and / or the liquid inlet flange body 1 is detachably connected to the liquid hydrogen storage tank.

[0081] The present application also provides a piston pump, which includes: a check valve, a hydraulic cylinder 2, a piston 3 and a liquid inlet flange body 1.

[0082] The piston pump includes the check valve as described above. The check valve can adopt the check valve in any of the above embodiments, and will not be elaborated here.

[0083] A liquid inlet channel is provided on the liquid inlet flange body 1; the check valve is connected to the liquid inlet flange body 1; the liquid inlet flange body 1 can adopt the liquid inlet flange body 1 in any of the above embodiments, and will not be elaborated here.

[0084] The liquid inlet flange body 1 is connected to the hydraulic cylinder 2. The hydraulic cylinder 2 includes a receiving cavity, and the liquid inlet channel is communicated with the receiving cavity; the hydraulic cylinder 2 includes a top end and a bottom end which are oppositely arranged, and the receiving cavity is arranged between the top end and the bottom end. The liquid inlet flange body 1 is connected to the bottom end of the hydraulic cylinder 2.

[0085] The piston 3 is movably arranged in the receiving cavity and can approach or move away from the liquid inlet flange body 1; the check valve can open and close the liquid inlet channel to connect or cut off the liquid inlet channel and the receiving cavity. The piston 3 is movably connected in the receiving cavity and reciprocates between the top end and the bottom end. When the piston 3 moves away from the liquid inlet flange body 1, the check valve opens the liquid inlet channel, and the liquid inlet channel is communicated with the receiving cavity to realize liquid inlet. When the piston 3 approaches the liquid inlet flange body 1, the check valve closes the liquid inlet channel, cutting off the liquid inlet channel and the receiving cavity, and stopping the liquid inlet.

[0086] The liquid inlet flange body 1 is connected between the hydraulic cylinder 2 and the liquid hydrogen storage tank. A liquid inlet channel is provided on the liquid inlet flange body 1. The liquid inlet channel includes an inlet end and an outlet end. The inlet end is communicated with the liquid hydrogen storage tank, and the outlet end is communicated with the hydraulic cylinder 2. A check valve is arranged at the outlet end of the liquid inlet channel. When feeding liquid, the piston 3 moves towards the top end, and the liquid hydrogen enters the liquid inlet channel from the inlet end. The fluid force pushes the check valve away from the outlet end, and the liquid inlet channel is communicated with the accommodating cavity, and the liquid enters the accommodating cavity. When the piston 3 moves to the top end and reaches the end point, the liquid feeding stops. Under the action of gravity, the check valve resets to the outlet end and forms a seal, cutting off the communication between the liquid inlet channel and the accommodating cavity. When the piston 3 moves towards the bottom end, the pressure in the hydraulic cylinder 2 is transmitted to the check valve through the liquid hydrogen, providing a downward pressure on the reset check valve to generate sufficient sealing pressure to achieve the sealing and check functions. With the above piston pump, when feeding liquid, the piston 3 moves upward, and the fluid force pushes the check valve to move away from the position to be sealed, connecting the liquid inlet channel and the accommodating cavity. When the liquid feeding stops, the check valve relies on gravity to self-reset to the position to be sealed, cutting off the liquid inlet channel and the accommodating cavity. When the piston 3 moves downward, the pressure in the hydraulic cylinder 2 is transmitted to the check valve through the liquid hydrogen. Under the combined action of the downward pressure and gravity, the check valve generates sufficient sealing pressure to achieve the sealing and check functions. And the check valve has a simple structure, reducing the driving difficulty and improving the response speed.

[0087] In addition, optionally, an avoidance hole is provided at one end of the piston facing the check valve, and at least a part of the check valve enters the avoidance hole. When the piston 3 moves towards the check valve, the limit frame 5 of the check valve can enter the avoidance hole. With the above piston 3, the structure can be made more compact. The limit frame 5 enters the piston 3, making the piston 3 have a smaller clearance at the compression end point, which is beneficial to increasing the volumetric efficiency and improving the performance of the piston pump.

[0088] In an embodiment of the present application, a convex structure is provided on the end face of the piston 3 facing the limit frame 5, and a groove structure matching the convex structure is provided on the end face of the liquid inlet flange body 1 facing the piston 3. The convex structure can enter the groove structure. A smooth chamfer is provided at the edge of the end of the convex structure away from the piston 3, and a smooth chamfer is also provided at the bottom of the groove structure.

[0089] In an embodiment of the present application, an avoidance hole is provided in the middle of the convex structure. The diameter of the avoidance hole is larger than the diameter of the limit frame 5. The avoidance hole covers the outside of the limit frame 5, and the limit frame 5 can enter the avoidance hole. A smooth chamfer is provided at the bottom of the avoidance hole, and a smooth chamfer is provided at the corner of the limit frame 5.

[0090] In an embodiment of the present application, the relief hole on the piston 3 is in an annular shape, that is, the relief hole divides the convex structure into the edge parts on both sides and the convex part in the middle; a through hole 53 is provided on the limit frame 5, and the diameter of the convex part is smaller than the diameter of the through hole 53. When the limit frame 5 enters the relief hole of the piston 3, the edge part enters the outer space of the limit frame 5, and the convex part enters the through hole 53. The piston 3 and the limit frame 5 invade each other, so that the piston 3 has a smaller clearance at the compression end, which is beneficial to increasing the volumetric efficiency and improving the performance of the piston pump.

[0091] In an embodiment of the present application, the valve body of the check valve includes a pressure-bearing surface, and the end surface of the convex part away from the piston 3 can be mutually fitted with the pressure-bearing surface. For example, when the pressure-bearing surface is arc-shaped, the end surface of the driving head is an arc-shaped that matches; or when the pressure-bearing surface is flat, the end surface of the driving head is flat.

[0092] The present application also provides an application of the check valve as described above in a liquid hydrogen pump. The application method can adopt any of the above embodiments, which will not be elaborated here.

[0093] As can be seen from the above description and practice, compared with the prior art, the check valve, the liquid inlet flange, the piston pump and the application of the check valve in the liquid hydrogen pump provided by the present application have the following advantages: by adopting the above check valve, the fluid force pushes the valve body 4 away from the position to be sealed. When the hydraulic cylinder 2 is filled with liquid, the limit frame 5 limits the maximum moving position of the valve body 4, shortening and reducing the moving distance of the valve body 4 in the hydraulic cylinder 2. Moreover, when the hydraulic cylinder 2 stops filling with liquid, the valve body 4 returns to the position to be sealed due to gravity; the pressure in the hydraulic cylinder 2 can be transmitted to the valve body 4 through liquid hydrogen. Under the combined action of the downward pressure and gravity, the valve body 4 provides sufficient sealing pressure to achieve the sealing and check functions. And the check valve has a simple structure, reducing the driving difficulty and improving the response speed.

[0094] Those of ordinary skill in the art should understand that: the above description is only for the specific embodiments of the present application and is not used to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the gist of the present application shall be included in the protection scope of the present application.

Claims

1. A check valve, characterized in that, Comprising: A limiting frame, the limiting frame includes a limiting body and at least two support legs evenly distributed on the limiting body, with a gap provided between adjacent support legs; the limiting body is disposed opposite to the position to be sealed; A valve body, the valve body is disposed within the limiting frame, the limiting frame is connected to the outer periphery of the position to be sealed, for limiting the maximum moving displacement of the valve body, and the valve body can reciprocate between the limiting body and the position to be sealed; A flange is provided at one end of the support leg away from the limiting body, and a fixing member is provided on the flange for connecting the flange to the outer periphery of the position to be sealed; At least one through hole penetrating along the axial direction is provided on the limiting body; The through hole is disposed opposite to the position to be sealed, the valve body is located between the through hole and the position to be sealed, and liquid hydrogen can act on the valve body through the through hole to provide a downward pressure for the valve body; a partial piston can enter the limiting frame through the through hole, and the check valve and the piston are mutually engaged within a small range; A convex structure is provided on the end face of the piston facing the limiting frame, and a groove structure cooperating with the convex structure is provided on the end face of the liquid inlet flange body facing the piston, and the convex structure can enter the groove structure; A relief hole is provided in the middle of the convex structure, the diameter of the relief hole is larger than the diameter of the limiting frame, the relief hole covers the outside of the limiting frame, the limiting frame can enter the relief hole, a smooth chamfer is provided at the bottom of the relief hole, and a smooth chamfer is provided at the corner of the limiting frame; A liquid inlet channel is provided on the liquid inlet flange body, the liquid inlet channel includes an inlet end and an outlet end, the inlet end is communicated with a liquid hydrogen storage tank, the outlet end is communicated with a hydraulic cylinder, the position to be sealed is the outlet end of the liquid inlet channel, and an arc surface is provided on the end face of the outlet end, and the arc surface of the outlet end is inclined downward.

2. The check valve according to claim 1, wherein: The valve body includes a main body and a lapping edge formed around the main body, the main body includes a sealing surface, the sealing surface protrudes toward the side of the position to be sealed and can at least partially enter the position to be sealed, and the lapping edge can lap on the edge of the position to be sealed.

3. The check valve according to claim 2, wherein: The thickness at the center of the main body is greater than the thickness of the lapping edge.

4. The check valve according to claim 3, wherein: The valve body further includes a pressure-bearing surface, the sealing surface is disposed opposite to the pressure-bearing surface, and the distance between the sealing surface and the pressure-bearing surface gradually increases to the center of the main body and then gradually decreases.

5. The check valve according to claim 2, wherein: A gap is provided between the lapping edge and the support leg.

6. The check valve according to claim 2, wherein: At least two evenly distributed moving channels are provided on the lapping edge, and the moving channels are in clearance fit with the support legs.

7. A liquid inlet flange, characterized in that, Comprising: The check valve according to any one of claims 1 to 6; An inlet liquid flange body, an inlet liquid channel is arranged on the inlet liquid flange body, the check valve is connected to the inlet liquid flange body and can open and close the inlet liquid channel.

8. A piston pump, characterized in that, Comprising: The check valve according to any one of claims 1 to 6; An inlet liquid flange body, an inlet liquid channel is arranged on the inlet liquid flange body; the check valve is connected to the inlet liquid flange body; A hydraulic cylinder, the inlet liquid flange body is connected to the hydraulic cylinder, the hydraulic cylinder includes a containing cavity, and the inlet liquid channel is communicated with the containing cavity; A piston, the piston is movably arranged in the containing cavity and can approach or move away from the inlet liquid flange body; the check valve can open and close the inlet liquid channel to connect or cut off the inlet liquid channel and the containing cavity.

9. The piston pump according to claim 8, wherein: An avoidance hole is arranged at one end of the piston facing the check valve, and at least a part of the check valve enters the avoidance hole.

10. Application of the check valve according to any one of claims 1 to 6 in a liquid hydrogen pump.

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