One-way valve

Abstract

The utility model discloses a one-way valve, which belongs to the technical field of fluid flow direction control equipment, and comprises a shell provided with a first end, a second end and a channel for communicating the first end with the second end; the wall face, close to the second end, of the channel is provided with a first conical face, the wall face close to the first end is provided with a sealing face, and the diameter of the first conical face is gradually reduced in the direction from the second end to the first end. The bracket is connected with the first end; a through hole communicated with the channel is formed in the bracket, a plugging block and an elastic piece which abut against the sealing face are arranged in the through hole, and the elastic piece enables the plugging block to have the tendency to be close to the second end. A second conical surface is arranged on the outer wall of the expansion sleeve, and when the second conical surface abuts against the first conical surface, the expansion sleeve enables the shell to have the trend of radial expansion. According to the utility model, the shell can be expanded and fixed through the first conical surface and the second conical surface which are matched; the plugging block can abut against the sealing face under the action of the elastic piece to achieve sealing, the shell, the bracket and the expansion sleeve are convenient to assemble, the overall structure is simple, and reliability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid flow control equipment, in particular to a one-way valve. Background Art

[0002] A one-way valve, also known as a check valve or non-return valve, can control the fluid to flow only along the water inlet and cannot flow back at the water outlet; a one-way valve is usually used in hydraulic systems to prevent oil flow from flowing in the opposite direction, or in pneumatic systems to prevent compressed air from flowing in the opposite direction.

[0003] In some operating systems, in order to ensure the one-way flow of fluid, one-way valves are widely used as passive control devices. As the usage scenarios change, the performance requirements of small size and high pressure applicability are further put forward for one-way valves. At the same time, one-way valves must also meet requirements in terms of stability and sealing. The structure of existing one-way valves often makes it difficult to meet the above requirements simultaneously.

[0004] Therefore, developing and designing a one-way valve with a strong connection structure, simple overall structure, easy assembly, no need for sealing rubber rings, and high reliability is a problem that needs to be solved urgently at this stage. Utility Model Content

[0005] In response to the problems existing in the prior art, the utility model provides a one-way valve, in which the first conical surface on the inner channel of the shell matches the second conical surface on the outer wall of the expansion sleeve, which can conveniently expand and fix the shell, and the connection is firm and stable; the sealing block in the through hole of the bracket can abut against the sealing surface on the inner channel of the shell under the action of the elastic member to block the channel, so that the fluid can only flow from the second end to the first end. The overall structure is simple, and the assembly between the shell, the bracket and the expansion sleeve is convenient, no sealing rubber ring is required, and the reliability is high.

[0006] In order to achieve the above purpose, the technical solution adopted by the present utility model is as follows:

[0007] The utility model provides a one-way valve, comprising:

[0008] A housing having a first end and a second end, wherein the housing has a passage connecting the first end and the second end; a first tapered surface is formed on a wall surface of the passage near the second end, wherein the diameter of the first tapered surface gradually decreases from the second end to the first end; and a sealing surface is formed on a wall surface of the passage near the first end;

[0009] a bracket connected to the first end; a through hole in the bracket communicating with the channel, a blocking block and an elastic member provided in the through hole, the blocking block abutting against the sealing surface, and the elastic member causing the blocking block to tend to move toward the second end;

[0010] An expansion sleeve can be installed in the channel; the outer wall of the expansion sleeve has a second conical surface that matches the first conical surface. When the second conical surface abuts the first conical surface, the expansion sleeve causes the shell to expand radially or have a tendency to expand radially.

[0011] As a preferred technical solution, a connecting groove is provided on the wall surface of the channel between the sealing surface and the first end, and a connecting protrusion matching the connecting groove is provided on the outer wall of the bracket close to the first end, and the connecting protrusion is embedded in the connecting groove.

[0012] As a preferred technical solution, a third conical surface is provided on the outer wall of the shell corresponding to the connecting groove, and the diameter of the third conical surface gradually decreases in the direction from the second end to the first end.

[0013] As a preferred technical solution, the taper of the third conical surface is set to 100-140°;

[0014] And / or, the connecting groove is configured as an annular groove extending along the circumferential direction.

[0015] As a preferred technical solution, the difference between the taper of the second conical surface and the taper of the first conical surface is set to ±2°;

[0016] And / or, the taper of the second conical surface is set to 12-20°.

[0017] As a preferred technical solution, the sealing surface is set as a fourth conical surface, and the diameter of the fourth conical surface gradually increases in the direction from the second end to the first end.

[0018] As a preferred technical solution, the taper of the fourth cone surface is set to 40-50°;

[0019] And / or, the blocking block is a steel ball;

[0020] And / or, the elastic member is configured as a spring, the blocking block is located between the spring and the sealing surface; a step surface is provided in the through hole; one end of the spring abuts against the blocking block, the other end of the spring abuts against the step surface, and the spring is in a compressed state.

[0021] As a preferred technical solution, a plurality of drain holes communicating with the through holes are provided on the side wall of the bracket.

[0022] As a preferred technical solution, a plurality of axially distributed annular grooves are provided on the outer wall of the shell near the second end.

[0023] As a preferred technical solution, the channel includes a small diameter section connected to the first end and a large diameter section connected to the second end; the sealing surface is provided at the small diameter section, and the first conical surface is provided at the large diameter section.

[0024] The beneficial effects of the present invention are as follows:

[0025] The first conical surface on the inner channel of the shell of the utility model matches the second conical surface on the outer wall of the expansion sleeve, which can conveniently expand and fix the shell; the sealing block in the through hole of the bracket can abut against the sealing surface on the inner channel of the shell under the action of the elastic member to seal the channel, and the fluid can only flow in the direction from the second end to the first end without using a sealing rubber ring, avoiding the defect that the sealing rubber ring is greatly affected by the use environment, with a wider range of applications and higher reliability; the shell, the bracket and the expansion sleeve are easy to assemble, the overall structure is simple, and when subjected to pressure, the overall connection structure of the utility model is more firm under the action of pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a one-way valve of the utility model;

[0027] Figure 2 for Figure 1 Schematic diagram of the cone angles of each cone surface in ;

[0028] Figure 3 for Figure 1 Enlarged view of area A in the middle;

[0029] Figure 4 for Figure 1 Schematic diagram after installation.

[0030] In the figure: 1-shell, 11-first end, 12-second end, 13-channel, 131-first conical surface, 132-sealing surface, 133-connecting groove, 134-small diameter section, 135-large diameter section, 14-third conical surface, 15-annular groove, 2-bracket, 21-through hole, 211-step surface, 22-connecting protrusion, 23-emptying hole, 3-blocking block, 4-elastic member, 5-expansion sleeve, 51-second conical surface, 6-work station hole, 61-limiting surface. DETAILED DESCRIPTION

[0031] In order to facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0032] Please refer to Figure 1-Figure 4, is an embodiment of a one-way valve provided by the utility model, including a shell 1, the shell 1 having a first end 11 and a second end 12, the shell 1 having a channel 13 connecting the first end 11 and the second end 12, and the channel 13 having a sealing surface 132 on the wall surface close to the first end 11; the bracket 2 is connected to the first end 11, and the bracket 2 has a through hole 21 connected to the channel 13, and a blocking block 3 and an elastic member 4 are provided in the through hole 21, the blocking block 3 abuts against the sealing surface 132, and the elastic member 4 makes the blocking block 3 have a tendency to move toward the second end 12, and only when the fluid flows in the direction from the second end 12 to the first end 11 and the pressure applied by the fluid to the blocking block 3 is greater than the elastic force applied by the elastic member 4 to the blocking block 3, can the blocking block 3 leave the sealing surface 132, and the fluid can flow from the channel 13 of the shell 1 through the through hole 21 of the bracket 2 and into the operating system;

[0033] At the same time, the channel 13 has a first conical surface 131 on the wall surface close to the second end 12, and the diameter of the first conical surface 131 gradually decreases in the direction from the second end 12 to the first end 11; the hollow structure expansion sleeve 5 can be installed in the channel 13 under the action of pressure; the outer wall of the expansion sleeve 5 has a second conical surface 51 that matches the first conical surface 131. When the second conical surface 51 abuts against the first conical surface 131, the expansion sleeve 5 causes the shell 1 to expand radially or has a tendency to expand radially, which can conveniently tighten and fix the shell 1 in the work station hole 6 of the operating system.

[0034] For clarification, please refer to Figure 2 In order to ensure efficient cooperation between the first conical surface 131 and the second conical surface 51, the difference between the taper α of the second conical surface 51 and the taper β of the first conical surface 131 is preferably set to ±2°; at the same time, the taper β of the second conical surface 51 is preferably set to 12-20°, and more preferably, the taper β of the second conical surface 51 is set to 16°, which can ensure that the expansion sleeve 5 has good expansion characteristics.

[0035] For details, please refer to Figure 4 Two annular grooves 15 distributed in the axial direction are provided on the outer wall of the shell 1 near the second end 12. After the shell 1 is loosely fitted into the work hole 6 of the operating system, the shell 1 is radially expanded by pressing the expansion sleeve 5. The shell 1 at the annular groove 15 is easier to deform and fits tightly with the work hole 6, ensuring that the shell 1 is firmly fixed on the operating system while also playing a sealing role. It should be noted that the radial, circumferential and axial directions in the present invention are all based on the axis of the shell 1.

[0036] For further information, please refer to Figure 1 、 Figure 2 and Figure 4The channel 13 includes a small-diameter section 134 communicating with the first end 11 and a large-diameter section 135 communicating with the second end 12; the sealing surface 132 is provided at the small-diameter section 134, and the shell 1 is thicker at the small-diameter section 134, having sufficient structural strength; the first conical surface 131 is provided at the large-diameter section 135, which facilitates pressing the expansion sleeve 5 into place while also reducing the thickness of the shell 1, making it easier for the shell 1 to expand radially.

[0037] In this embodiment, please refer to Figure 1-Figure 3 A connecting groove 133 is provided on the wall surface of the channel 13 between the sealing surface 132 and the first end 11, and a connecting protrusion 22 matching the connecting groove 133 is provided on the outer wall of the bracket 2 near the first end 11. The connecting protrusion 22 is embedded in the connecting groove 133 to firmly connect the shell 1 and the bracket 2; specifically, the connecting groove 133 is preferably set as an annular groove extending along the circumferential direction, and the connecting protrusion 22 can be set as a matching annular protrusion or a plurality of circumferentially distributed protrusions, both of which can firmly connect the shell 1 and the bracket 2; in other embodiments, the connecting groove 133 can also be set as a plurality of circumferentially distributed arc segments, and accordingly, the shape of the connecting protrusion 22 matches the arc segment-shaped connecting groove 133, and the bracket 2 can also be fixed to the shell 1.

[0038] Based on the above examples, please refer to Figure 1-Figure 4 A third conical surface 14 is provided on the outer wall of the shell 1 corresponding to the connecting groove 133, and the diameter of the third conical surface 14 gradually decreases along the direction from the second end 12 to the first end 11. When the shell 1 is installed into the work hole 6 of the operating system, the work hole 6 has a limiting surface 61 that matches the third conical surface 14. While limiting the shell 1, the third conical surface 14 can also be squeezed, so that the connecting groove 133 can further clamp the connecting protrusion 22, thereby improving the connection stability between the bracket 2 and the shell 1.

[0039] For details, please refer to Figure 2 In order to ensure the limiting effect and improve the clamping effect of the connecting groove 133 on the connecting protrusion 22, the taper γ of the third conical surface 14 is set to 100-140°. More preferably, the taper γ of the third conical surface 14 is set to 120°.

[0040] In this embodiment, please refer to Figure 1-Figure 4 The sealing surface 132 is set as a fourth conical surface, and the diameter of the fourth conical surface gradually increases in the direction from the second end 12 to the first end 11; accordingly, the blocking block 3 is set as a steel ball, and when the steel ball abuts against the fourth conical surface, the channel 13 can be effectively blocked and sealed, with high reliability, and no sealing rubber ring is required; in other embodiments, the sealing surface 132 can also be a plane, and accordingly, the blocking block 3 is in a square shape, so that the sealing effect can be guaranteed when the blocking block 3 abuts against the sealing surface 132.

[0041] For details, please refer to Figure 2 The taper δ of the fourth conical surface is set to 40-50°. More preferably, the taper δ of the fourth conical surface is set to 45°. The tolerance range of the taper δ of the fourth conical surface is set to ±2°. The taper δ of the fourth conical surface can ensure that the sealing block 3 has the best sealing characteristics under this taper condition.

[0042] For further information, please refer to Figure 1-Figure 4 The elastic member 4 is set as a spring, and the blocking block 3 is located between the spring and the sealing surface 132; a step surface 211 is provided in the through hole 21; one end of the spring abuts against the blocking block 3, and the other end of the spring abuts against the step surface 211. The spring is in a compressed state, and the spring can exert a stable elastic force on the blocking block 3 so that the blocking block 3 abuts against the sealing surface 132 and ensures the sealing effect; in other embodiments, the elastic member 4 can also be a spring sheet, based on the ability to exert a stable elastic force on the blocking block 3.

[0043] In this embodiment, please refer to Figure 1-Figure 4 Two drain holes 23 connected to the through hole 21 are provided on the side wall of the bracket 2. The two drain holes 23 are symmetrically arranged to ensure that after the blocking block 3 leaves the sealing surface 132, the through hole 21 has a good drainage space; in other embodiments, the number of drain holes 23 can also be other values, so as to ensure the smooth flow of the fluid in the through hole 21.

[0044] Please refer to Figure 1-Figure 4 , the specific working process of this utility model is as follows:

[0045] Place the elastic member 4 and the steel ball into the through hole 21 of the bracket 2 in sequence, and insert the connecting protrusion 22 of the bracket 2 into the connecting groove 133 to connect the bracket 2 to the housing 1;

[0046] Place the housing 1 into the work hole 6 of the operating system. At this point, the housing 1 and the work hole 6 are loosely fitted, and the limiting surface 61 abuts against the third conical surface 14. Under the action of external pressure, press the expansion sleeve 5 from the second end 12 of the housing 1 into the channel 13 until the second conical surface 51 engages with the first conical surface 131, causing the outer wall of the housing 1 to radially expand and tightly contact the work hole 6, thereby fixing the housing 1 in the work hole 6.

[0047] When fluid flows in from the first end 11, when the pressure of the fluid on the steel ball is greater than the elastic force of the elastic member 4 on the steel ball, the fluid pushes the steel ball to separate the steel ball from the sealing surface 132, and the fluid flows into the operating system through the through hole 21 and the drain hole 23 of the bracket 2; when the pressure of the fluid on the steel ball is not greater than the elastic force of the elastic member 4 on the steel ball, the steel ball abuts against the sealing surface 132 to achieve sealing.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A one-way valve, characterized in that: include: A shell (1), the shell (1) having a first end (11) and a second end (12), the shell (1) having a channel (13) in communication with the first end (11) and the second end (12); a first conical surface (131) is provided on a wall surface of the channel (13) close to the second end (12), the diameter of the first conical surface (131) gradually decreasing in a direction from the second end (12) to the first end (11); a sealing surface (132) is provided on a wall surface of the channel (13) close to the first end (11); A bracket (2), the bracket (2) being connected to the first end (11); a through hole (21) communicating with the channel (13) is provided in the bracket (2); a blocking block (3) and an elastic member (4) are provided in the through hole (21); the blocking block (3) abuts against the sealing surface (132); and the elastic member (4) causes the blocking block (3) to have a tendency to move toward the second end (12); An expansion sleeve (5) is installed in the channel (13); the outer wall of the expansion sleeve (5) is provided with a second conical surface (51) matching the first conical surface (131); when the second conical surface (51) abuts against the first conical surface (131), the expansion sleeve (5) causes the housing (1) to expand radially or has a tendency to expand radially.

2. A one-way valve according to claim 1, characterized in that: The channel (13) is provided with a connecting groove (133) on the wall surface between the sealing surface (132) and the first end (11); the bracket (2) is provided with a connecting protrusion (22) matching the connecting groove (133) on the outer wall near the first end (11); the connecting protrusion (22) is embedded in the connecting groove (133).

3. A one-way valve according to claim 2, characterized in that: A third conical surface (14) is provided on the outer wall of the housing (1) corresponding to the connecting groove (133), and the diameter of the third conical surface (14) gradually decreases in the direction from the second end (12) to the first end (11).

4. A one-way valve according to claim 3, characterized in that: The taper of the third conical surface (14) is set to 100-140°; And / or, the connecting groove (133) is configured as an annular groove extending in the circumferential direction.

5. A one-way valve according to claim 1, characterized in that: The difference between the taper of the second tapered surface (51) and the taper of the first tapered surface (131) is set to ±2°; And / or, the taper of the second conical surface (51) is set to 12-20°.

6. A one-way valve according to claim 1, characterized in that: The sealing surface (132) is set as a fourth conical surface, and the diameter of the fourth conical surface gradually increases along the direction from the second end (12) to the first end (11).

7. A one-way valve according to claim 6, characterized in that: The taper of the fourth cone surface is set to 40-50°; And / or, the blocking block (3) is configured as a steel ball; And / or, the elastic member (4) is configured as a spring, the blocking block (3) is located between the spring and the sealing surface (132); a step surface (211) is provided in the through hole (21); one end of the spring abuts against the blocking block (3), and the other end of the spring abuts against the step surface (211), and the spring is in a compressed state.

8. The one-way valve according to claim 1, characterized in that: A plurality of drain holes (23) communicating with the through holes (21) are provided on the side wall of the bracket (2).

9. The one-way valve according to claim 1, characterized in that: A plurality of axially distributed annular grooves (15) are provided on the outer wall of the housing (1) close to the second end (12).

10. The one-way valve according to claim 1, characterized in that: The channel (13) comprises a small-diameter section (134) communicating with the first end (11) and a large-diameter section (135) communicating with the second end (12); the sealing surface (132) is provided at the small-diameter section (134), and the first conical surface (131) is provided at the large-diameter section (135).

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