Check valve

Abstract

The utility model belongs to the technical field of valves, and particularly relates to a check valve which comprises a valve body, a flow channel is arranged in the valve body, and connecting threads are arranged at the two ends of the valve body. The detachable valve element is arranged in the flow channel through a detachable connecting structure; the detachable valve element blocks the inlet end and the outlet end of the flow channel when a medium stops flowing, and the detachable valve element communicates with the inlet end and the outlet end of the flow channel when the medium flows down. Compared with the prior art, when the valve element assembly is damaged, only the detachable valve element needs to be directly detached and replaced, and the valve element is installed in the flow channel of the valve body again after a new valve element is replaced, the whole valve does not need to be detached, maintenance time is greatly shortened, maintenance of the check valve is facilitated, and use cost is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of valve technology, and in particular relates to a check valve. Background Technology

[0002] A check valve is a type of valve that relies on the pressure of the medium to actuate and prevent backflow of the medium. It belongs to the category of automatic valves and is also known as a non-return valve, one-way valve, backflow valve, or isolation valve. Commonly available check valves typically consist of a valve body, a valve seat within the valve body, a ball valve core that mates with the valve seat, and a preload spring. When the medium flows in the forward direction, the valve core opens due to the thrust of the medium; when the medium stops flowing, the valve core is pressed against the valve seat by the elastic force of the preload spring, thus preventing backflow of the medium.

[0003] The existing check valve requires complete replacement if it is damaged during use, and maintenance is inconvenient, increasing operating costs and reducing work efficiency. Therefore, it is necessary to make improvements. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a check valve that facilitates maintenance and reduces operating costs.

[0005] In view of this, the present invention provides a check valve, comprising:

[0006] The valve body has a flow channel inside and connecting threads at both ends.

[0007] Also includes:

[0008] A detachable valve core, wherein the detachable valve core is arranged in the flow channel via a detachable connection structure;

[0009] The detachable valve core blocks the inlet and outlet of the flow channel when the medium stops flowing, and connects the inlet and outlet of the flow channel when the medium flows in the direction of flow.

[0010] In this technical solution, when the valve core assembly is damaged, the detachable valve core can be directly removed and replaced. After replacing the new valve core, it can be reinstalled into the flow channel of the valve body without disassembling the entire valve. This greatly shortens the maintenance time, facilitates the maintenance of the check valve, and reduces the cost of use.

[0011] In the above technical solution, the detachable valve core further includes:

[0012] A column body, wherein cavities are provided in the column body along the axial direction, the top end of the cavity is a medium inlet, the bottom end of the cavity is provided with a sealing end cap, and a valve seat is provided in the cavity;

[0013] The medium outlet has two outlets that are symmetrically distributed along the radial direction of the column on both sides of the middle part of the column.

[0014] A ball valve core assembly, wherein the ball valve core assembly is disposed in the cavity;

[0015] The two ends of the medium outlet are respectively connected to the cavity and the flow channel. The ball valve core assembly cooperates with the valve seat to block the medium inlet and the medium outlet. When the medium flows downstream, the ball valve core assembly separates from the valve seat to connect the medium inlet and the medium outlet.

[0016] In the above technical solution, the top sidewall of the column is provided with an external thread, and the inner wall of the flow channel is provided with an internal thread that mates with the external thread. The column is detachably arranged in the flow channel through the mating of the external and internal threads.

[0017] In the above technical solution, the ball valve core assembly further includes two ball valve cores and two preload springs arranged corresponding to the two ball valve cores. The valve seat is arranged in two positions corresponding to the two ball valve cores. The two ball valve cores are distributed axially at intervals and are both located upstream of the medium outlet.

[0018] In the above technical solution, further, there is a gap between the bottom sidewall of the column and the inner wall of the flow channel, the medium outlet is located at the top of the gap, and the medium in the gap can form a gas blocking layer in the gap area by utilizing surface tension.

[0019] Furthermore, the above technical solution also includes:

[0020] A sealing ring is disposed between the column and the flow channel to seal the contact surface between the column and the flow channel, and the sealing ring is located upstream of the medium outlet;

[0021] The ring groove has two ring grooves that are symmetrically distributed on the upper and lower sides of the sealing ring, and the ring grooves are concentrically distributed with the sealing ring.

[0022] The annular protrusions are distributed on the inner and outer edges of the annular groove, and are concentrically distributed with the sealing ring.

[0023] Deformation groove, which is arranged in a ring on the outer circumferential surface of the sealing ring, and the deformation groove is concentrically distributed with the sealing ring;

[0024] The inner walls of the column and the flow channel are respectively provided with retaining rings and retaining grooves for installing the sealing rings, and the surfaces of the retaining rings and retaining grooves are provided with protruding rings for fitting the ring grooves.

[0025] The beneficial effects of this utility model are:

[0026] 1. The detachable valve core design enables modular replacement, reducing maintenance time to less than 1 / 5 of that of traditional valves, minimizing downtime losses, facilitating check valve maintenance, and lowering operating costs.

[0027] 2. The double ball valve core, combined with the pre-tightening spring, forms a multi-stage seal, reducing the leakage rate to below 0.01 mL / min; the liquid film barrier in the annular gap further isolates impurities from the sealing surface, extending service life.

[0028] 3. The sealing ring forms multiple seals through the annular groove and annular protrusion, which improves the sealing performance and is compatible with different sealing ports, making it highly applicable. The symmetrical design on both sides facilitates the installation of the sealing ring. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a specific embodiment of the present utility model.

[0031] Figure 2 This is an exploded view of the structure of this utility model.

[0032] Figure 3 This is a schematic cross-sectional view of the present invention.

[0033] Figure 4 This is a schematic diagram of the sealing ring structure of this utility model.

[0034] Figure 5 This is a schematic cross-sectional view of the sealing ring of this utility model.

[0035] The markings in the diagram are as follows:

[0036] 1. Valve body; 100. Connecting thread; 2. Flow channel; 3. Removable valve core; 30. Column; 31. Cavity; 32. Medium inlet; 33. Sealing end cap; 34. Valve seat; 35. Medium outlet; 36. Ball valve core assembly; 4. External thread; 5. Internal thread; 6. Ball valve core; 7. Preload spring; 8. Clearance; 9. Sealing ring; 10. Annular groove; 11. Annular protrusion; 12. Deformation groove; 13. Snap ring; 14. Snap groove; 15. Raised ring. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0038] In the description of this application, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0039] Example 1:

[0040] This application provides a check valve, including: a valve body 1, a flow channel 2 provided inside the valve body 1, and connecting threads 100 provided at both ends of the valve body 1;

[0041] It also includes: a detachable valve core 3, which is arranged in the flow channel 2 through a detachable connection structure;

[0042] The detachable valve core 3 blocks the inlet and outlet of the flow channel 2 when the medium stops flowing, and connects the inlet and outlet of the flow channel 2 when the medium flows in the direction of flow.

[0043] In this embodiment, when the valve core assembly is damaged, the detachable valve core 3 can be directly removed and replaced. After replacing the new valve core, it can be reinstalled into the flow channel 2 of the valve body 1 without disassembling the entire valve. This greatly shortens the maintenance time, facilitates the maintenance of the check valve, and reduces the cost of use.

[0044] Example 2:

[0045] This embodiment provides a check valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the detachable valve core 3 further includes: a column 30, in which a cavity 31 is provided along the axial direction, the top end of the cavity 31 is a medium inlet 32, the bottom end of the cavity 31 is provided with a sealing end cap 33, and a valve seat 34 is provided in the cavity 31; a medium outlet 35, which has two outlets and is symmetrically distributed radially along the two sides of the middle part of the column 30; and a ball valve core assembly 36, which is disposed in the cavity 31.

[0046] The two ends of the medium outlet 35 are connected to the cavity 31 and the flow channel 2 respectively. The ball valve core assembly 36 cooperates with the valve seat 34 to block the medium inlet 32 ​​and the medium outlet 35. When the medium flows downstream, the ball valve core assembly 36 separates from the valve seat 34 to connect the medium inlet 32 ​​and the medium outlet 35.

[0047] The top sidewall of the column 30 is provided with an external thread 4, and the inner wall of the flow channel 2 is provided with an internal thread 5 that mates with the external thread 4. The column 30 is detachably arranged in the flow channel 2 through the mating of the external thread 4 and the internal thread 5.

[0048] The ball valve core assembly 36 includes two ball valve cores 6 and two preload springs 7 arranged corresponding to the two ball valve cores 6. The valve seat 34 has two corresponding to the two ball valve cores 6. The two ball valve cores 6 are distributed axially at intervals and are both located upstream of the medium outlet 35.

[0049] There is a gap 8 between the bottom sidewall of the column 30 and the inner wall of the channel 2. The medium outlet 35 is located at the top of the gap 8. The medium in the gap 8 can form a gas blocking layer in the gap 8 region by utilizing surface tension.

[0050] Furthermore, the sealing end cap 33 is threadedly fixed to the bottom of the column 30. A sealing packing material is also present between the sealing end cap 33 and the inner wall of the cavity 31. This sealing packing material has a multi-layered alternating structure, including a flexible graphite layer and an intermediate layer formed by alternating stacks of graphite layers and barrier membrane material. The ball valve core 6 is made of silicon nitride ceramic. The valve seat 34 is integrally machined into the inner wall of the cavity 31. The sealing surface of the valve seat 34 is spherical or conical, forming a spherical seal or line seal with the ball valve core 6. The preload spring 7 is made of Inconel 718, with a wire diameter of 0.8mm, a free length of 15mm, and a stiffness coefficient of 5N / mm, ensuring… When there is no medium pressure, the ball valve core 6 fits tightly against the valve seat 34. One end of the preload spring 7 abuts against the ball valve core 6, and the other end can be connected to the inner wall of the cavity 31 through a conventional spring support seat. The two ball valve cores 6 are distributed axially at a distance of 10mm. The upstream ball is 325mm away from the medium inlet, and the downstream ball is 358mm away from the medium outlet, forming a series double seal. A 0.5mm annular gap 8 is left between the bottom side wall of the column 30 and the inner wall of the flow channel 2, with a height of 15mm (from the medium outlet 35 to the bottom). When the medium flows through, some of the medium is retained in the gap 8, forming a liquid film barrier with a thickness of about 0.1mm.

[0051] In this embodiment, when the medium flows in from the inlet end of the valve body 1, the initial pressure acts on the upstream ball valve core 6, overcoming the preload of the first spring, causing it to move axially along the cavity 31 and disengage from the upstream valve seat 34. As the medium continues to flow, the pressure is transmitted to the downstream ball valve core 6, overcoming the preload of the second spring, causing it to move and disengage from the downstream valve seat 34. The medium flows into the annular gap 8 through the two radial outlets in the middle section of the cavity 31. At this time, the stagnant medium in the gap 8 is pushed by the new medium and flows out from the outlet end of the valve body 1, achieving forward flow. Furthermore, the arrangement of the two radial medium outlets 35 effectively prevents the check valve from failing due to blockage of one medium outlet 35, improving the working stability of the check valve. When the medium stops flowing or flows backward, the spring force pushes the two ball valve cores 6 to reset, sequentially abutting against the corresponding valve seats 34: the upstream ball seals first, blocking most of the backflow medium; the downstream ball further seals, ensuring no leakage. The retained medium within the annular gap 8 forms a stable liquid film due to surface tension, isolating the backflow gas (such as compressed air) from the sealing surface and preventing impurities in the gas from wearing down the valve core or valve seat 34. When leakage occurs in the valve core assembly (such as wear on the sealing surface), close the upstream pipeline valve to release the pipeline pressure. Use a special wrench to unscrew the removable valve core 3, remove the old valve core, and clean the internal threads 5 and sealing surface of the valve body 1. Screw the new valve core into the valve body 1, ensuring that the sealing ring 9 is fully embedded in the groove 14. Reopen the pipeline valve to complete the maintenance. The entire process takes ≤5 minutes, significantly shortening maintenance time, facilitating check valve maintenance, and reducing operating costs.

[0052] Example 3:

[0053] This embodiment provides a check valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including: a sealing ring 9, which is disposed between the column 30 and the flow channel 2 to seal the contact surface between the column 30 and the flow channel 2, and the sealing ring 9 is located upstream of the medium outlet 35; an annular groove 10, which has two grooves symmetrically distributed on the upper and lower sides of the sealing ring 9, and the annular groove 10 is concentrically distributed with the sealing ring 9; an annular protrusion 11, which is distributed on the inner and outer edges of the annular groove 10, and the annular protrusion 11 is concentrically distributed with the sealing ring 9; and a deformation groove 12, which is annularly disposed on the outer circumferential surface of the sealing ring 9, and the deformation groove 12 is concentrically distributed with the sealing ring 9.

[0054] The inner walls of the column 30 and the flow channel 2 are respectively provided with a retaining ring 13 and a retaining groove 14 for mounting the sealing ring 9. The surfaces of the retaining ring 13 and the retaining groove 14 are provided with a protruding ring 15 for mounting the ring groove 10.

[0055] Furthermore, the sealing ring 9 is made of fluororubber (FKM) with a cross-sectional dimension of φ25mm×3mm, suitable for operating conditions from -20℃ to 200℃. Two annular deformation grooves 12 (0.5mm deep, 1mm wide) are provided on the outer circumference, allowing radial compression of up to 20%. An annular groove (0.3mm deep) is provided on each of the upper and lower surfaces of the sealing ring 9, corresponding to the retaining groove 14 of the valve body 1 and the protruding ring 15 (0.2mm high) on the retaining ring 13 of the column 30, forming a labyrinth seal after assembly. The retaining ring 13 of the column 30 is 1mm thick and mates with the retaining groove 14 of the valve body 1 to restrict the axial displacement of the sealing ring 9, ensuring sealing stability.

[0056] In this embodiment, the sealing ring 9 forms multiple seals through the annular groove 10 and the annular protrusion, which improves the sealing performance and is compatible with different sealing ports, making it highly applicable. The symmetrical design on both sides facilitates the installation of the sealing ring 9.

[0057] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A check valve, comprising: A valve body (1) is provided with a flow channel (2) inside the valve body (1), and connecting threads (100) are provided at both ends of the valve body (1); Its characteristic is that it further includes: A detachable valve core (3) is arranged in the flow channel (2) via a detachable connection structure; The detachable valve core (3) blocks the inlet and outlet of the flow channel (2) when the medium stops flowing, and connects the inlet and outlet of the flow channel (2) when the medium flows in the direction of flow.

2. A check valve according to claim 1, characterized in that, The detachable valve core (3) also includes: A column (30) is provided with axially distributed cavities (31) inside the column (30), the top end of the cavity (31) is a medium inlet (32), the bottom end of the cavity (31) is provided with a sealing end cap (33), and a valve seat (34) is provided in the cavity (31). Medium outlet (35), the medium outlet (35) has two and is symmetrically distributed on both sides of the middle part of the column (30) along the radial direction of the column (30); A ball valve core assembly (36) is disposed in a cavity (31); The two ends of the medium outlet (35) are connected to the cavity (31) and the flow channel (2) respectively. The ball valve core assembly (36) cooperates with the valve seat (34) to block the medium inlet (32) and the medium outlet (35). When the medium flows in the same direction, the ball valve core assembly (36) separates from the valve seat (34) to connect the medium inlet (32) and the medium outlet (35).

3. A check valve according to claim 2, characterized in that: The top sidewall of the column (30) is provided with an external thread (4), and the inner wall of the flow channel (2) is provided with an internal thread (5) that mates with the external thread (4). The column (30) is detachably arranged in the flow channel (2) through the mating of the external thread (4) and the internal thread (5).

4. A check valve according to claim 2, characterized in that: The ball valve core assembly (36) includes two ball valve cores (6) and two preload springs (7) arranged corresponding to the two ball valve cores (6). The valve seat (34) has two corresponding to the two ball valve cores (6). The two ball valve cores (6) are distributed axially at intervals and are both located upstream of the medium outlet (35).

5. A check valve according to claim 2, characterized in that: There is a gap (8) between the bottom sidewall of the column (30) and the inner wall of the channel (2), and the medium outlet (35) is located at the top of the gap (8). The medium in the gap (8) can form a gas blocking layer in the gap (8) region by utilizing surface tension.

6. A check valve according to claim 2, characterized in that, Also includes: A sealing ring (9) is provided between the column (30) and the flow channel (2) to seal the contact surface between the column (30) and the flow channel (2), and the sealing ring (9) is located upstream of the medium outlet (35); Annular groove (10), the annular groove (10) has two and is symmetrically distributed on the upper and lower sides of the sealing ring (9), the annular groove (10) and the sealing ring (9) are concentrically distributed; Annular protrusions (11) are distributed on the inner and outer edges of the annular groove (10), and the annular protrusions (11) are concentrically distributed with the sealing ring (9); Deformation groove (12), the deformation groove (12) is arranged in a ring on the outer circumferential surface of the sealing ring (9), and the deformation groove (12) and the sealing ring (9) are concentrically distributed; The inner walls of the column (30) and the flow channel (2) are respectively provided with a retaining ring (13) and a retaining groove (14) for mounting the sealing ring (9). The surfaces of the retaining ring (13) and the retaining groove (14) are provided with a protruding ring (15) for mounting the ring groove (10).

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