Spring type miniature one-way valve and control method thereof

Abstract

The invention relates to the technical field of spring type miniature one-way valves, in particular to a spring type miniature one-way valve and a control method thereof.The spring type miniature one-way valve comprises a valve seat, the valve seat is fixedly connected with a valve flow distribution type miniature hydraulic pump through outer side threads, a cavity is formed in the middle of the top of the valve seat, and a spring base is clamped at the bottom of the cavity; the valve seat cavity is slidably connected with a spring seat at the top of the spring base, a valve element groove is formed in the middle of the bottom of the spring seat, and a valve element is coaxially installed in the valve element groove in an interference fit mode. The sealing structure has the beneficial effects that as the pressure difference between the oil outlet and the oil inlet is reduced, the gap between the oil outlet of the valve seat and the valve element is correspondingly reduced until the oil outlet of the valve seat and the valve element are in surface contact to form sealing; and when the pressure difference between the oil outlet and the oil inlet is reduced, the gap between the oil outlet of the valve seat and the valve element is correspondingly reduced until the oil outlet of the valve seat and the valve element are in surface contact to form sealing, and the one-way valve is closed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of spring type micro one-way valve, in particular to a spring type micro one-way valve and a control method thereof. BACKGROUND

[0002] For oil drilling and production work under complex geological conditions, using oil drilling and production equipment with micro hydraulic pump is a common oil well development means. However, due to the late start of domestic micro hydraulic technology development, low reliability of domestic micro hydraulic components, and other problems, the localization application of micro hydraulic components still has great development space. The localization of components of the vertical drilling system of the oil drilling equipment provides a driving force to solve the above problems. The vertical drilling system is a high-reliability drilling equipment system developed for the problems of heterogeneous rock strata and low efficiency of drilling deviation correction. The hydraulic components in the system all need to be designed with micro structure to reduce the diameter of the oil well to save drilling and production time and cost.

[0003] In recent years, the localization application of micro hydraulic components has developed rapidly, providing a large number of high-quality production and manufacturing parts for the hydraulic industry. In the design and development of hydraulic pumps, the key technology research of plunger pairs, flow distribution pairs, and sliding shoe pairs has produced many innovative achievements. These key technologies can improve the working reliability and efficiency of hydraulic pumps, achieve more accurate control and monitoring of working media, real-time display of the running state of hydraulic equipment, collection of running data for fault prediction, and real-time diagnosis of faults. Therefore, the development and design of advanced hydraulic pumps are the inevitable trend of the future hydraulic field. In a typical valve flow distribution type micro hydraulic pump, one of the key components is the one-way valve.

[0004] In order to meet the axial and radial size requirements of the micro hydraulic pump, a spring type micro one-way valve capable of achieving valve flow distribution needs to be developed. Some current spring type micro one-way valves are relatively large in size, have high requirements for the performance of the built-in spring, and have low reliability, which seriously affects the use efficiency of the micro hydraulic pump and increases the use cost. In order to solve this problem, it is meaningful to invent a spring type micro one-way valve with smaller size and higher reliability. SUMMARY

[0005] The present application aims to provide a spring type micro one-way valve and a control method thereof to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: a valve seat is fastened and connected with a valve flow distribution type micro hydraulic pump by using external threads, a cavity is formed in the top and middle part of the valve seat, the bottom of the cavity holds a spring base, a spring seat is slidably connected to the top of the spring base in the cavity of the valve seat, a valve core groove is formed in the middle of the bottom of the spring seat, and a valve core is installed in the valve core groove by interference fit.

[0007] The bottom of the valve seat is provided with a sealing groove, and an O-shaped ring is clamped in the sealing groove.

[0008] The spring base is clamped at the bottom of a cavity formed in the middle of the valve seat.

[0009] The bottom of the spring seat is provided with spring cavities, and the number of the spring cavities is the same as the number of the groups of springs connected to the top of the spring base.

[0010] The rough end of the valve core is in surface contact with the oil outlet port of the valve seat to form a seal, and the outer side of the spring seat and the inner side of the valve seat slide relative to each other to form a moving pair.

[0011] The bottom of the spring seat is provided with a plurality of inclined flow channels.

[0012] The spring seat is provided with a flow channel at the bottom of the spring cavity and the flow channel.

[0013] A control method of a spring type micro one-way valve, comprising the following steps:

[0014] Step one: opening, the oil in the cavity at the lower end of the oil outlet of the one-way valve is discharged through other one-way valves connected by the cavity, at this time, the pressure in the cavity at the oil outlet is obviously smaller than the atmospheric pressure, under the action of the pressure difference, the spring seat pushes the spring in the spring cavity to be compressed, the relative axial displacement between the valve seat oil outlet and the valve core generates a gap, the oil flows into the cavity at the lower end of the oil outlet from the gap, and the one-way valve is opened.

[0015] Step two: closing, as the pressure difference between the oil and the oil outlet and the oil inlet decreases, the gap between the valve seat oil outlet and the valve core also decreases, until the valve seat oil outlet and the valve core are in surface contact to form a seal, and the one-way valve is closed.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] The spring type micro one-way valve and the control method thereof are provided, the one-way valve is screwed on the valve distribution type micro hydraulic pump before work, and is immersed in the oil source, at this time, the O-ring in the sealing groove around the bottom of the valve seat cooperates with the sealing inclined surface of the valve distribution type micro hydraulic pump to prevent the oil from leaking from the threaded side of the valve seat to the oil source; when the oil in the lower end cavity of the oil outlet of the one-way valve is discharged through other one-way valves connected by the cavity, at this time, the cavity pressure of the oil outlet is obviously smaller than the external atmospheric pressure, the spring in the spring cavity is compressed under the action of the pressure difference, at this time, the relative axial displacement between the oil outlet of the valve seat and the valve core generates a gap, the oil flows into the flow channel groove at the bottom of the flow channel through the inner cavity in the middle of the valve seat along the flow channel around the valve seat, and then flows into the gap between the oil outlet of the valve core and the valve seat from the flow channel groove, and then flows into the lower end cavity of the oil outlet from the gap, and the one-way valve is opened; as the pressure difference between the oil outlet and the oil inlet decreases, the gap between the oil outlet of the valve seat and the valve core also decreases, until the oil outlet of the valve seat and the valve core are in surface contact to form a seal; as the pressure difference between the oil outlet and the oil inlet decreases, the gap between the oil outlet of the valve seat and the valve core also decreases, until the oil outlet of the valve seat and the valve core are in surface contact to form a seal, and the one-way valve is closed; in the device, the axial and radial dimensions of the one-way valve are very small, the multiple spring redundancy design improves the working reliability of the one-way valve, and the size adaptation problem of the one-way valve of the valve distribution type micro hydraulic pump is solved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1 It is the axial side view of the spring type micro one-way valve of the present application.

[0019] Fig. 2 It is the cross-sectional structure schematic diagram of the present application.

[0020] Fig. 3 It is the three-dimensional structure schematic diagram of the spring seat of the present application.

[0021] Fig. 4 It is the three-dimensional structure schematic diagram of the spring base of the present application.

[0022] In the figure: O-ring 1, valve seat 2, spring base 3, valve core 4, spring 5, spring seat 6, sealing groove 7, valve core groove 8, spring cavity 9, flow channel 10, spring guide rod 11, flow channel 12. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme of the present application clear, complete and more clear and obvious, the embodiments of the present application are further described in detail below in combination with the drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present application, not all embodiments, and are used to explain the embodiments of the present application, and do not limit the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0024] Please refer to Figs. 1 to 4 The application provides a technical solution: the valve seat 2 is fastened and connected with the valve flow distribution type micro hydraulic pump by the outer thread, the top of the valve seat 2 is provided with a cavity, the bottom of the cavity clamps the spring base 3, the cavity of the valve seat 2 is slidably connected with the spring seat 6 at the top of the spring base 3, the bottom of the spring seat 6 is provided with a valve core groove 8, and the valve core 4 is arranged in the valve core groove 8 by interference fit.

[0025] The bottom of the valve seat 2 is provided with a sealing groove 7 around the valve seat 2, the O-shaped ring 1 is clamped in the sealing groove 7, the lower end of the valve seat 2 is an oil outlet, and the O-shaped ring 1 is matched with the sealing inclined surface of the valve flow distribution type micro hydraulic pump to prevent oil from leaking from the threaded side of the valve seat 2 to the oil source.

[0026] The spring base 3 is clamped in the cavity at the middle of the valve seat 2, a plurality of spring guide rods 11 are arranged around the top of the spring base 3, the spring base 3 is connected with the spring 5 around the spring guide rod 11, and the spring guide rod 11 can guide the extension direction of the spring 5 to prevent the spring 5 from being skewed.

[0027] The bottom of the spring seat 6 is provided with a spring cavity 9 around the spring seat 6, the number of spring cavities 9 is the same as the number of springs 5 connected to the top of the spring base 3, the spring 5 is inserted into the spring cavity 9 and connected with the inner wall at the top of the spring cavity 9, and the spring 5 can drive the spring seat 6 to extend and retract through the spring cavity 9; under the action of the pressure difference, the spring seat 6 pushes the spring 5 in the spring cavity 9 to be compressed, and at this time, the oil outlet of the valve seat 2 and the valve core 4 relatively axially displace to form a gap.

[0028] The thick end of the valve core 4 is in contact with the oil outlet port surface of the valve seat 2 to form a seal, and the outer side of the spring seat 6 and the inner side of the valve seat 2 relatively slide to form a moving pair; a plurality of inclined flow channels 10 are arranged at the bottom of the spring seat 6, the flow channels 10 are staggered with the spring cavities 9 arranged at the bottom of the spring seat 6, the top of the flow channel 10 is communicated with the middle inner cavity of the spring seat 6, and the flow channel 10 is inclined to be arranged, and the top of the flow channel 10 is always communicated with the oil source through the inner cavity in the middle of the spring seat 6.

[0029] The spring seat 6 is provided with a drainage groove 12 at the bottom of the spring cavity 9 and the flow channel 10; the oil flows along the flow channel 10 around the valve seat 2 through the inner cavity in the middle of the valve seat 2, flows into the drainage groove 12 at the bottom of the flow channel 10, and flows into the gap between the valve seat 2 and the oil outlet of the valve core 4 from the drainage groove 12.

[0030] In actual use, before work, the check valve is screwed on the valve distribution type micro hydraulic pump, and is immersed in the oil source. At this time, the O-ring 1 in the sealing groove 7 around the bottom of the valve seat 2 cooperates with the sealing slope of the valve distribution type micro hydraulic pump to prevent oil leakage from the threaded side of the valve seat 2 to the oil source. When the oil outlet lower end cavity of the check valve discharges through other check valves connected by the cavity, the pressure in the cavity at the oil outlet is obviously less than the atmospheric pressure. Under the action of the pressure difference, the spring seat 6 pushes the spring 5 in the spring cavity 9 to compress. At this time, the valve seat 2 and the valve core 4 are relatively axially displaced to form a gap. The oil flows through the inner cavity of the valve seat 2, along the flow channel 10 around the valve seat 2, into the drainage groove 12 at the bottom of the flow channel 10, and from the drainage groove 12 into the gap between the valve seat 2 and the valve core 4 at the oil outlet, and then flows into the oil outlet lower end cavity, and the check valve is opened.

[0031] As the pressure difference between the oil outlet and the oil inlet decreases, the gap between the valve seat 2 and the valve core 4 at the oil outlet also decreases, until the valve seat 2 and the valve core 4 at the oil outlet are in surface contact to form a seal. As the pressure difference between the oil outlet and the oil inlet decreases, the gap between the valve seat 2 and the valve core 4 at the oil outlet also decreases, until the valve seat 2 and the valve core 4 at the oil outlet are in surface contact to form a seal, and the check valve is closed. In the device, the axial and radial dimensions of the check valve are very small, and the multiple spring redundancy design improves the working reliability of the check valve, solving the size matching problem of the valve distribution type micro hydraulic pump check valve.

[0032] Although the above describes the specific embodiments of the present application in order to enable those skilled in the art to understand the present application, the present application is not limited to the scope of the specific embodiments. For those skilled in the art, all applications created by utilizing the concept of the present application are within the scope of the present application as long as various changes are within the spirit and scope of the present application as defined and determined by the appended claims.

Claims

1. A spring-loaded micro one-way valve, characterized in that: include: The valve seat (2) is fastened to the valve distribution type micro hydraulic pump by using an outer thread, a cavity is opened in the middle of the top of the valve seat (2), the bottom of the cavity clamps the spring base (3), the cavity of the valve seat (2) is slidably connected to the spring seat (6) on the top of the spring base (3), a valve core groove (8) is opened in the middle of the bottom of the spring seat (6), and a valve core (4) is coaxially installed in the valve core groove (8) through interference fit.

2. A spring-loaded micro one-way valve according to claim 1, characterized in that: The bottom of the valve seat (2) is provided with sealing grooves (7) around its periphery. An O-ring (1) is held in the sealing groove (7). The lower end of the valve seat (2) is an oil outlet. The O-ring (1) cooperates with the sealing inclined surface of the valve distribution type micro hydraulic pump to prevent oil from leaking from the threaded side of the valve seat (2) to the oil source.

3. A spring-loaded micro one-way valve according to claim 2, characterized in that: The spring base (3) is clamped at the bottom of a cavity opened in the middle of the valve seat (2), and multiple groups of spring guide rods (11) are arranged around the top of the spring base (3). The spring base (3) is connected to the spring (5) around the spring guide rods (11).

4. The spring-loaded micro one-way valve according to claim 3, characterized in that: The bottom of the spring seat (6) is provided with spring cavities (9) around its periphery. The number of groups of spring cavities (9) is the same as the number of groups of springs (5) connected to the top of the spring base (3). The springs (5) are inserted into the spring cavities (9) and connected to the top inner wall of the spring cavities (9).

5. The spring-loaded micro one-way valve according to claim 4, characterized in that: The thick end of the valve core (4) contacts the oil outlet port surface of the valve seat (2) to form a seal, and the outer side of the spring seat (6) and the inner side of the valve seat (2) slide relative to each other to form a moving pair.

6. The spring-loaded micro one-way valve according to claim 5, characterized in that: The bottom of the spring seat (6) is provided with a plurality of inclined flow channels (10), the flow channels (10) and the spring cavity (9) provided at the bottom of the spring seat (6) are staggered with each other, the top of the flow channel (10) is communicated with the middle inner cavity of the spring seat (6), and the top of the flow channel (10) is always kept unobstructed with the external oil source through the middle inner cavity of the spring seat (6).

7. The spring-loaded micro one-way valve according to claim 6, characterized in that: The spring seat (6) is provided with a discharge groove (12) at the bottom of the spring cavity (9) and the flow channel (10).

8. A control method for a spring-loaded micro one-way valve according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step 1: Open, the oil in the cavity at the lower end of the one-way valve oil outlet is discharged through the other one-way valve connected to the cavity. At this time, the cavity pressure at the oil outlet is significantly lower than the external atmospheric pressure. Under the action of the pressure difference, the spring seat (6) is pushed to compress the spring (5) in the spring cavity (9). The oil outlet of the valve seat (2) and the valve core (4) are relatively displaced axially to form a gap. The oil flows into the cavity at the lower end of the oil outlet from the gap, and the one-way valve is opened; Step 2: Closing, the oil pressure difference between the oil outlet and the oil inlet decreases, and the gap between the oil outlet of the valve seat (2) and the valve core (4) also decreases accordingly, until the oil outlet of the valve seat (2) and the valve core (4) are restored to contact with each other to form a seal, and the one-way valve is closed.

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