One-way valve, power device using one-way valve and working method

Abstract

The invention belongs to the technical field of engineering elements, and particularly relates to a valve, in particular to a one-way valve, a power device using the one-way valve and a working method. The one-way valve comprises a valve cavity which is horizontally arranged in a valve pipe; the valve ball is arranged in the valve cavity in a sliding mode and used for sealing the liquid inlet of the valve pipe; the two ends of the compression spring abut against the valve ball and the side wall of the valve cavity respectively. The filtering ring is horizontally and slidably arranged in the valve cavity, and the inner wall of the filtering ring is matched with the valve ball; a plurality of filtering holes are formed in the filtering ring; the multiple sealing pieces are evenly distributed in the circumferential direction of the valve ball and used for sealing the filtering holes; when the pressure in the valve pipe is positive, fluid pushes the valve ball to move towards the liquid inlet, and the sealing piece abuts against the filtering ring to prevent the fluid in the valve cavity from overflowing towards the liquid inlet. And through cooperation of the filtering ring and the sealing piece, liquid in the valve pipe can be prevented from overflowing outwards.

Description

Technical Field

[0001] This invention belongs to the field of engineering components technology, specifically relating to valves, and more particularly to one-way valves, power devices using one-way valves, and working methods. Background Technology

[0002] A check valve is a common fluid control component. Its core function is to ensure that liquids or gases flow in a pipeline in only one direction, thereby protecting other equipment in the system. Its basic working principle is as follows: when fluid flows in a preset direction (from inlet to outlet), its pressure overcomes the spring force or the valve disc's own weight, opening the valve. Once the flow stops or reverse flow occurs, the spring force, the reverse fluid pressure, and the valve disc's own weight work together to quickly close the valve disc, cutting off the flow path.

[0003] However, in the field of plunger pump applications, the opening and closing of the check valve depends not only on the thrust of the fluid on the valve ball, but also on the positive and negative pressure inside the plunger pump. Therefore, when the plunger pump is under positive pressure, the liquid inside the plunger pump will flow in the opposite direction to the inlet of the check valve, causing some of the liquid inside the check valve to overflow in the opposite direction, which affects the flow rate of the liquid flowing into the plunger pump.

[0004] Therefore, how to solve the problem of reverse overflow of fluid inside the plunger check valve is a technical problem that urgently needs to be solved in this field.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore, the above description is not considered to constitute information related to the technology. Summary of the Invention

[0006] This disclosure provides at least one check valve, a power device using the check valve, and a method of operation.

[0007] In a first aspect, embodiments of this disclosure provide a one-way valve, comprising: The valve chamber is horizontally positioned inside the valve tube; The valve ball, which is slidably disposed in the valve cavity, is used to seal the liquid inlet of the valve tube; A compression spring, the two ends of which abut against the valve ball and the side wall of the valve cavity, respectively; The filter ring is horizontally slidably disposed in the valve cavity, and its inner wall is adapted to the valve ball; The filter ring has several filter holes; A plurality of sealing plates are evenly distributed around the valve ball to seal the filter holes; When there is positive pressure inside the valve tube, the fluid pushes the valve ball towards the inlet, and the sealing plate abuts against the filter ring to prevent the fluid in the valve chamber from overflowing out of the inlet.

[0008] In one optional embodiment, a traction rope is provided between the sealing sheet and the filter ring, the length of the traction rope being less than the travel of the valve ball; When the fluid pushes the valve ball to compress the compression spring, the sealing plate moves horizontally relative to the filter ring until the traction rope is taut, and then the filter ring moves horizontally synchronously with the sealing plate.

[0009] Secondly, embodiments of this disclosure also provide a power device, comprising: The crankshaft, whose rotation is located within the machine body; A power unit is disposed within the machine body and connected to the crankshaft to drive the crankshaft to rotate; A plunger pump assembly, which is located on the power unit side and is directly driven by the crankshaft; The machine body has a receiving cavity that surrounds the outer wall of the power unit and the outer wall of the plunger pump assembly; The inlet valve and outlet valve are respectively located on both sides of the machine body, and both are connected to the receiving cavity; The receiving cavity is connected to the plunger pump assembly; The power unit drives the plunger pump assembly to reciprocate via a crankshaft; When the plunger pump assembly is under negative pressure, the inlet valve opens to allow fluid to flow into the receiving chamber; When the plunger pump assembly is under positive pressure, the fluid flows around the plunger pump assembly and the outer wall of the power unit within the containment cavity and flows out through the outlet valve.

[0010] In one alternative embodiment, the plunger pump assembly includes: The pump body and the plunger are slidably disposed in the pump body and the lower end is sleeved on the outer wall of the crankshaft via a connecting rod; The pump body has a notch at its upper end, and the notch communicates with the receiving cavity.

[0011] In one optional embodiment, two isolation blocks are symmetrically arranged on the outer wall of the pump body, one isolation block is arranged between the pump body and the inner wall of the receiving cavity, and the other isolation block is arranged between the pump body and the outer wall of the power device.

[0012] In one optional embodiment, both the inlet valve and the outlet valve are one-way valves.

[0013] In one alternative embodiment, at least one sector-shaped counterweight is provided on the crankshaft to balance the inertial force generated by the crankshaft during rotation.

[0014] In one alternative embodiment, the fan-shaped counterweight is integrally formed with the crankshaft or fixedly installed on the corresponding phase of the crankshaft via a connector.

[0015] In one alternative embodiment, the power unit is a diesel engine, and the piston connecting rod mechanism of the diesel engine and the piston connecting rod mechanism of the piston pump assembly are both connected to different crank arms of the crankshaft.

[0016] In one alternative embodiment, a sealed cylinder head is provided at the upper end of the machine body, which is located above the power unit and the plunger pump assembly.

[0017] Thirdly, this disclosure also provides a method for operating a power device, the method comprising: The power unit drives the plunger pump assembly to reciprocate via a crankshaft; When the plunger pump assembly is under negative pressure, the inlet valve opens to allow fluid to flow into the receiving chamber; When the plunger pump assembly is under positive pressure, the fluid flows around the plunger pump assembly and the outer wall of the power unit in the containment cavity and flows out through the outlet valve. The liquid flows along the containment cavity around the outer wall of the power unit and the outer wall of the plunger pump assembly to carry away the heat generated during the operation of the power unit.

[0018] The beneficial effects of this invention are that it provides a one-way valve, a power unit using the one-way valve, and a working method. Through the cooperation of the filter ring and the sealing plate, liquid overflow from the valve pipe can be prevented, thus improving the sealing performance of the one-way valve when closed. Furthermore, by integrating the power unit and the plunger pump assembly into the same body, sharing the crankshaft and housing cavity, the independent support structure, couplings, and other components required by traditional separate designs are eliminated. This reduces the overall size and weight and simplifies the assembly process. The housing cavity surrounds the power unit and the plunger pump assembly; fluid flows along the cavity during pumping, carrying away the heat generated by the power unit. This "liquid-cooled" heat dissipation replaces an independent cooling system, reducing the overall heat load of the machine, and is particularly suitable for high-load conditions (such as continuously operating diesel engines), avoiding seal aging or component failure caused by overheating.

[0019] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0020] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 A cross-sectional front view of a check valve provided in an embodiment of this disclosure; Figure 2 An unfolded perspective view of the power unit provided in an embodiment of this disclosure; Figure 3 This is a schematic diagram of the fluid flow state within the accommodating cavity provided in an embodiment of the present disclosure; Figure 4 A longitudinal sectional perspective view of a plunger pump assembly provided in an embodiment of this disclosure; Figure 5 Provided for the embodiments of this disclosure Figure 4 A magnified view of part A in the image; Figure 6 This is a perspective view of the filter ring and sealing sheet when the inlet valve is in the open state, as provided in an embodiment of this disclosure.

[0023] In the picture: 1. Engine body; 2. Crankshaft; 20. Sector-shaped counterweights; 3. Power unit; 4. Plunger pump assembly; 41. Pump body; 42. Plunger; 43. Connecting rod; 44. Notch; 45. Isolation block; 5. Receiving cavity; 6. Inlet valve; 60. Valve tube; 61. Valve chamber; 62. Valve ball; 63. Compression spring; 64. Filter ring; 65. Sealing plate; 7. Discharge valve; 8. Sealing cylinder cover. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In this document, when it is mentioned that a first component is located on a second component, this can mean that the first component can be directly formed on the second component, or that a third component can be inserted between the first and second components. Furthermore, in the accompanying drawings, the thickness of the components may be exaggerated or reduced for the purpose of effectively describing the technical content.

[0026] In this document, exemplary embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. As used herein, expressions such as “at least one of…” modify an entire column of elements when following a column of elements. For example, the expression “at least one of a, b, and c” should be understood to include only a, only b, only c, both a and b, both a and c, both b and c, or all of a, b, and c.

[0027] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise expressly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0028] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0029] Research has shown that piston pumps, as an important fluid transport device, are widely used in many industrial fields such as engineering machinery, mining equipment, and hydraulic systems due to their high pressure and high efficiency. Traditional piston pumps usually exist as an independent hydraulic component, and their power source depends on an external drive device. The most common mode is to connect them to prime movers such as diesel engines and electric motors through couplings to form a split-type power pump unit.

[0030] This traditional split design has revealed the following drawbacks during long-term use: First, the diesel engine and the plunger pump are two independent units, each requiring its own independent support structure, lubrication system and sealing housing. This results in the entire power pump set having a complex structure, large size and heavy weight, which not only increases manufacturing costs but also limits its application in space-constrained situations.

[0031] Secondly, power needs to be transmitted through couplings and other transmission components, which inevitably results in energy loss and reduces the overall efficiency of the machine. At the same time, the presence of couplings and exposed transmission components also brings additional noise, vibration, and potential safety hazards.

[0032] Third, both diesel engines and plunger pumps generate a lot of heat during operation, but their cooling systems are often designed independently, resulting in low thermal management efficiency. Especially under high load conditions, excessive heat load on the whole machine becomes a key factor affecting the reliability and lifespan of the equipment.

[0033] Therefore, how to solve the problem of low heat dissipation efficiency of split diesel engines and plunger pumps is a technical problem that urgently needs to be solved in this field.

[0034] The defects in the above solutions and the reasons for their occurrence are the results of the inventors' practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure should be considered as the inventors' contributions to this disclosure.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] like Figure 1 As shown, at least one embodiment provides a one-way valve, comprising: The valve consists of a valve tube 60, a valve chamber 61, a valve ball 62, a compression spring 63, a filter ring 64, and sealing plates 65. The valve chamber 61 is horizontally positioned within the valve tube 60, and the valve ball 62 slides within it to seal the inlet. The compression spring 63 provides preload, the filter ring 64 has filter holes, and the sealing plates 65 are circumferentially distributed. (See attached diagram.) Figure 6 There are multiple sealing plates 65, evenly distributed circumferentially on the outer wall of the valve ball 62, with gaps between adjacent sealing plates 65. The filter ring 64 is annular, its inner ring matching the outer wall of the valve ball 62; the filter ring 64 has several filter holes corresponding to the sealing plates 65. When the filter ring 64 separates from the sealing plates 65, as... Figure 6As shown, fluid flows into the valve chamber 61 through the filter holes and the gap between two adjacent sealing plates 65. When the filter ring 64 abuts against the sealing plate 65, the sealing plate 65 seals the filter holes to prevent backflow of fluid. During operation, when there is negative pressure in the plunger pump assembly 4, the valve ball 62 moves towards the pump body 41 to compress the spring 63, opening the inlet. When the valve ball 62 moves horizontally, it moves the sealing plate 65 away from the filter ring 64, and the fluid flows into the receiving chamber 5 after passing through the filter holes. When there is positive pressure in the plunger pump assembly 4, the fluid pushes the valve ball 62 away from the pump body 41, and the sealing plate 65 abuts against the filter ring 64, preventing the fluid in the valve chamber 61 from overflowing. The traction rope design ensures that the filter ring 64 and the sealing plate 65 can move synchronously to avoid jamming. This structure conforms to the API 6D valve standard and is suitable for fluids containing particles. The filter hole size can be adjusted according to the cleanliness of the fluid (e.g., 0.1 mm orifice diameter for highly polluted environments), extending pump life.

[0038] like Figure 2 As shown, at least one embodiment provides a power unit, including: a crankshaft 2, which is rotatably disposed within a body 1; the body 1 is made of high-strength cast iron and integrates a power unit 3 and a plunger pump assembly 4, forming a closed structure. The crankshaft 2 is rotatably disposed within the body 1 via bearings, and the power unit 3 is connected to the crankshaft 2 via a connecting rod 43 to drive its rotation; the plunger pump assembly 4 is directly driven by the crank arm of the crankshaft 2 to achieve reciprocating motion. This integrated design reduces the transmission chain length and improves energy transfer efficiency. The power unit 3 is disposed within the body 1 and connected to the crankshaft 2 to drive its rotation; the plunger pump assembly 4 is disposed on one side of the power unit 3 and is directly driven by the crankshaft 2; a receiving cavity 5 is formed within the body 1, surrounding the outer wall of the power unit 3 and the outer wall of the plunger pump assembly 4; an inlet valve 6 and an outlet valve 7 are respectively disposed on both sides of the body 1 and both communicate with the receiving cavity 5; the inlet valve 6 is the one-way valve described in the above embodiment. The receiving cavity 5 is connected to the plunger pump assembly 4; wherein, the power unit 3 drives the plunger pump assembly 4 to reciprocate via the crankshaft 2; when the plunger pump assembly 4 is under negative pressure, the inlet valve 6 opens to allow fluid to flow into the receiving cavity 5; when the plunger pump assembly 4 is under positive pressure, the fluid flows around the plunger pump assembly 4 and the outer wall of the power unit 3 within the receiving cavity 5 and flows out through the outlet valve 7. In this embodiment, the crankshaft 2 is functionally matched with the body 1 in the prior art and can serve as a power source. Furthermore, integrating the plunger pump with the body 1 not only provides heat dissipation but also offers versatility; for example, in engineering machinery where two pumps are needed to draw in and discharge different fluids simultaneously, the integrated design allows for multiple uses in one machine.

[0039] like Figure 3As shown, the receiving cavity 5 is located inside the machine body 1, surrounding the outer wall of the power unit 3 and the outer wall of the plunger pump assembly 4, forming an annular flow channel. The inlet valve 6 and the outlet valve 7 are respectively installed on both sides of the machine body 1 and communicate with the receiving cavity 5. When the plunger pump assembly 4 is working, fluid is drawn in through the inlet valve 6, circulates in the receiving cavity 5, and is discharged from the outlet valve 7, while carrying away heat. Figure 3 This demonstrates the flow state of the fluid within the receiving cavity 5. Figure 3 In the diagram, F1 indicates that fluid flows into cavity 5; F2 indicates that fluid flows out of cavity 5. The fluid flows around the cavity wall to ensure uniform heat dissipation.

[0040] Reference Appendix Figure 4 The plunger pump assembly 4 includes a pump body 41, a plunger 42, a connecting rod 43, and a notch 44. The pump body 41 is fixed inside the machine body 1, and the plunger 42 is slidably disposed within the pump body 41, with its lower end sleeved on the outer wall of the crankshaft 2 via the connecting rod 43. The upper end of the pump body 41 has a notch 44 that communicates with the receiving cavity 5, allowing fluid to enter the pump chamber. This sliding seal design conforms to the standards for high-pressure plunger pumps (such as ISO 4391), ensuring sealing while reducing friction loss. Two isolation blocks 45 are symmetrically arranged on the outer wall of the pump body 41, one located between the pump body 41 and the inner wall of the receiving cavity 5, and the other located between the pump body 41 and the outer wall of the power unit 3. The isolation blocks 45 are made of wear-resistant polymer and function to divide the receiving cavity 5 into directional flow channels, preventing short-circuit flow of fluid and improving heat dissipation efficiency. In hydraulic systems, this design reduces turbulence and is suitable for high-viscosity fluids (such as hydraulic oil), ensuring uniform heat exchange. The inlet valve 6 and the outlet valve 7 are both one-way valves to prevent fluid backflow. (See attached diagram.) Figure 4 A sector-shaped counterweight 20 is installed on crankshaft 2, which is integrally formed or bolted to the phase of crankshaft 2. The counterweight calculation is based on the crankshaft 2 rotational inertia force balance formula (the industry commonly used ISO1940-1 standard), to counteract the inertial torque generated by the diesel engine piston and plunger pump connecting rod 43, reducing vibration to below 5mm / s. The power unit 3 is a diesel engine, whose piston connecting rod mechanism and plunger pump connecting rod 43 are connected to different crank arms of crankshaft 2 to achieve coordinated movement of multiple cylinders. Through counterweight optimization, it can adapt to speed fluctuations (600-1800rpm).

[0041] Reference Appendix Figure 2 The upper part of the machine body 1 is equipped with a sealing cylinder cover 8, which uses a rubber sealing ring to prevent fluid leakage.

[0042] Work methods such as Figure 3 As shown: The power unit 3 drives the plunger pump assembly 4 to reciprocate via the crankshaft 2; when the plunger 42 moves back and creates negative pressure, the inlet valve 6 opens (e.g., Figure 1(F1 indicates the direction of fluid flow). The fluid flows into the receiving cavity 5. When the plunger 42 moves forward to create positive pressure, the fluid flows around in the receiving cavity 5 and is discharged through the outlet valve 7. The fluid flow path carries away the heat of the power unit 3. In continuously operating diesel generator sets, this design can replace the external cooler and reduce auxiliary equipment.

[0043] The power device proposed in this embodiment has the following advantages: Compact and lightweight design: This invention integrates the power unit 3 (such as a diesel engine) and the plunger pump assembly 4 into the same body 1, sharing the crankshaft 2 and housing cavity 5, eliminating the need for independent support structures, couplings, and other components required in traditional separate designs. This not only reduces the overall size and weight but also simplifies the assembly process, making it suitable for space-constrained engineering machinery applications, such as mobile hydraulic equipment or mining machinery.

[0044] Energy efficiency improvement and vibration control: The crankshaft 2 directly drives the plunger pump assembly 4, avoiding energy loss in the coupling transmission. At the same time, the sector-shaped counterweight 20 set on the crankshaft 2 effectively balances the rotational inertial force, reduces the vibration and noise of the whole machine, improves the comfort and life of the equipment, and meets the industry requirements for stability of high-pressure plunger pumps.

[0045] High-efficiency thermal management: The housing 5 surrounds the power unit 3 and the plunger pump assembly 4. During pumping, fluid flows along the housing, carrying away the heat generated by the power unit 3. This "liquid-cooled" heat dissipation replaces the independent cooling system, reducing the overall heat load of the machine. It is particularly suitable for high-load conditions (such as diesel engines operating continuously) and avoids overheating that leads to seal aging or component failure.

[0046] Functional Integration and Reliability: The inlet valve 6 and outlet valve 7 employ a one-way valve design. The filter ring 64 and sealing plate 65 of the inlet valve 6 prevent impurities from entering, extending valve body life. Furthermore, the isolation block 45 ensures directional fluid flow within the receiving cavity 5, avoiding eddy current losses. These designs enable the plunger pump to perform multiple functions, including suction, discharge, and cooling, enhancing its adaptability to harsh environments such as high-dust construction sites.

[0047] Easy maintenance and cost optimization: The integrated design reduces external piping and sealing points, lowering the risk of leakage. The modular structure of valve assemblies (such as inlet valve 6) allows for quick replacement, reducing maintenance time. Overall manufacturing costs are reduced, while thermal management extends the service life of critical components (such as crankshaft 2 and connecting rod 43).

[0048] At least one embodiment provides a method for operating a power unit, the method comprising: The power unit 3 drives the plunger pump assembly 4 to reciprocate via the crankshaft 2; When the plunger pump assembly 4 is under negative pressure, the inlet valve 6 opens to allow fluid to flow into the receiving chamber 5; When the plunger pump assembly 4 is under positive pressure, the fluid flows around the plunger pump assembly 4 and the outer wall of the power unit 3 in the receiving cavity 5 and flows out through the outlet valve 7. The liquid flows along the receiving cavity 5, surrounding the outer wall of the power unit 3 and the outer wall of the plunger pump assembly 4, to remove the heat generated during the operation of the power unit 3. In the description of the embodiments of the present invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence unless expressly indicated herein. Therefore, without departing from the teachings of the exemplary embodiments, the first element, component, region, layer, or segment discussed above may be referred to as a second element, component, region, layer, or segment.

[0050] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A one-way valve, characterized in that, include: The valve chamber (61) is horizontally positioned inside the valve tube (60); The valve ball (62) is slidably disposed in the valve cavity (61) and is used to seal the liquid inlet of the valve tube (60); A compression spring (63) has its two ends abutting against the valve ball (62) and the side wall of the valve cavity (61), respectively; The filter ring (64) is horizontally slidably disposed in the valve cavity (61), and its inner wall is adapted to the valve ball (62); The filter ring (64) has a plurality of filter holes; A plurality of the sealing plates (65) are circumferentially distributed around the valve ball (62) for sealing the filter holes; When the valve tube (60) is under positive pressure, the fluid pushes the valve ball (62) toward the inlet, and the sealing plate (65) abuts against the filter ring (64) to block the fluid in the valve chamber (61) from overflowing out of the inlet.

2. The one-way valve as described in claim 1, characterized in that, A traction rope is provided between the sealing sheet (65) and the filter ring (64), and the length of the traction rope is less than the travel of the valve ball (62). When the fluid pushes the valve ball (62) to compress the compression spring (63), the sealing plate (65) moves horizontally relative to the filter ring (64) until the traction rope is taut, and then the filter ring (64) moves horizontally synchronously with the sealing plate (65).

3. A power unit, characterized in that, The one-way valve as described in claim 1 or 2 includes: The crankshaft (2) is rotatably located within the machine body (1); A power unit (3) is disposed inside the body (1) and connected to the crankshaft (2) to drive the crankshaft (2) to rotate; A plunger pump assembly (4) is located on one side of the power unit (3) and is directly driven by the crankshaft (2); A receiving cavity (5) is provided inside the body (1), which surrounds the outer wall of the power unit (3) and the outer wall of the plunger pump assembly (4); The inlet valve (6) and the outlet valve (7) are respectively located on both sides of the body (1) and are connected to the receiving cavity (5); The receiving cavity (5) is connected to the plunger pump assembly (4), and the valve pipe (60) is connected to the receiving cavity (5); Among them, the power unit (3) drives the plunger pump assembly (4) to reciprocate through the crankshaft (2); When the plunger pump assembly (4) is under negative pressure, the inlet valve (6) opens to allow fluid to flow into the receiving chamber (5). When the plunger pump assembly (4) is under positive pressure, the fluid flows around the plunger pump assembly (4) and the outer wall of the power unit (3) in the receiving cavity (5) and flows out through the outlet valve (7).

4. The power unit as described in claim 3, characterized in that, The plunger pump assembly (4) includes: Pump body (41) and plunger (42), wherein the plunger (42) is slidably disposed in the pump body (41), and its lower end is sleeved on the outer wall of the crankshaft (2) via a connecting rod (43); The pump body (41) has a notch (44) at its upper end, and the notch (44) is connected to the receiving cavity (5).

5. The power unit as described in claim 4, characterized in that, Two isolation blocks (45) are symmetrically arranged on the outer wall of the pump body (41). One isolation block (45) is located between the pump body (41) and the inner wall of the receiving cavity (5), and the other isolation block (45) is located between the pump body (41) and the outer wall of the power device (3).

6. The power unit as described in claim 3, characterized in that, Both the inlet valve (6) and the outlet valve (7) are one-way valves.

7. The power unit as described in claim 3, characterized in that, At least one sector-shaped counterweight (20) is provided on the crankshaft (2) to balance the inertial force generated by the crankshaft (2) during rotation.

8. The power unit as described in claim 7, characterized in that, The sector-shaped counterweight (20) is integrally formed with the crankshaft (2) or fixedly installed on the corresponding phase of the crankshaft (2) through a connector.

9. The power unit as described in claim 3, characterized in that, The power unit (3) is a diesel engine, and the piston connecting rod (43) mechanism of the diesel engine and the piston connecting rod (43) mechanism of the plunger pump assembly (4) are both connected to different crank arms of the crankshaft (2).

10. The power unit as described in claim 3, characterized in that, A sealed cylinder head (8) is provided at the upper end of the body (1), which is located above the power unit (3) and the plunger pump assembly (4).

11. A method for operating a power device, characterized in that, The operating method of using the power unit as described in any one of claims 3-10 includes: The power unit (3) drives the plunger pump assembly (4) to reciprocate via the crankshaft (2); When the plunger pump assembly (4) is under negative pressure, the inlet valve (6) opens to allow fluid to flow into the receiving chamber (5). When the plunger pump assembly (4) is under positive pressure, the fluid flows around the plunger pump assembly (4) and the outer wall of the power unit (3) in the receiving cavity (5) and flows out through the outlet valve (7); The liquid flows along the containment cavity (5) around the outer wall of the power unit (3) and the outer wall of the plunger pump assembly (4) to carry away the heat generated during the operation of the power unit (3).

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