A hard-sealed check valve with a leak detection function

Abstract

The present invention discloses a hard-sealed check valve with a leak detection function, which includes a valve body and a valve cover. A closing disc is slidably connected up and down inside the valve cover, and a spring is installed on the lower side of the closing disc so that the closing disc can seal the valve body and prevent backflow. The hard-sealed check valve also includes two ring sleeves and a transparent ring plate. The ring plate connects the two ring sleeves. The ring sleeves are respectively sleeved on the outer sides of the valve body and the valve cover. Visible particles that can change when contacting the medium are provided inside the ring plate. The present invention performs the sealing work between the valve body and the valve cover through hard sealing. When a liquid leakage phenomenon occurs, the flowing-out medium will react with the visible particles, facilitating the staff to observe the liquid leakage phenomenon. The staff can adjust and enable the present invention to switch between the bidirectional flow and the unidirectional flow functions, and the staff can adjust the maximum flow rate per unit time of the present invention during unidirectional flow.

Description

Technical Field

[0001] The present invention relates to the technical field of check valves, and particularly to a hard-sealed check valve with a leak detection function. Background Art

[0002] A check valve is a valve body that controls the flow direction of gas and liquid. As shown in a micro-pressure check valve disclosed in the application number: 201010532197.5, most of the check valves on the market are currently composed of a valve body and a valve cover fixed in combination, and the seal between the valve body and the valve cover is usually achieved by using a sealing ring. In order to enhance the sealing performance, the sealing ring inside the valve generally uses a rubber material at present, that is, an O-ring.

[0003] However, in industry, if corrosive media flow inside the check valve, it is easy to corrode the O-ring made of rubber material, resulting in liquid leakage. Therefore, there is a hard-sealed check valve on the market, which replaces the rubber material sealing ring inside the ordinary check valve with a plastic or metal material, so as to form a hard seal between the valve body and the valve cover. This kind of sealing structure has the advantages of long service life and corrosion resistance. However, it is difficult for the existing hard-sealed check valve to solve the problem of poor hard-seal tightness, that is, the check valve with a hard-seal structure is prone to leakage. Under the action of the hard sealing ring, if the check valve has a small leakage, especially when the transported medium is gas, it is difficult for the staff to detect, which is likely to cause economic losses and potential safety hazards.

[0004] Moreover, most of the check valves on the market currently cannot adjust the flow rate per unit time, and their functions are single. Summary of the Invention

[0005] Aiming at the deficiencies of the prior art, the present invention provides a hard-sealed check valve with a leak detection function to solve the problems that it is difficult to detect when liquid leakage occurs in the existing hard-sealed check valve and the existing check valve has a single function.

[0006] The present invention provides the following technical solutions: A hard-sealed check valve with a leak detection function, including a valve body and a valve cover. An inlet liquid flow channel is provided inside the valve body, and a first threaded portion is provided inside the inlet liquid flow channel. An outlet liquid flow channel is provided inside the valve cover. From top to bottom, the outlet liquid flow channel is composed of a large-diameter portion, a middle-diameter portion, a small-diameter portion, and a second threaded portion. The valve cover is fixed inside the large-diameter portion so that the inlet liquid flow channel and the outlet liquid flow channel are communicated; A closing disc is slidably connected up and down inside the middle-diameter portion. The diameter of the closing disc is smaller than the diameter of the middle-diameter portion but larger than the diameter of the inlet liquid flow channel. An inner ring is provided on the side surface of the small-diameter portion. A spring is placed against the upper side surface of the ring. The upper end of the spring is connected to the lower side surface of the closing disc so that the closing disc can abut against the lower side surface of the valve body and close the inlet liquid flow channel;

[0007] It also includes two ring sleeves and a transparent ring plate. The ring plate connects the two ring sleeves. The two ring sleeves are of different sizes and are respectively sleeved on the outside of the valve body and the valve cover. A second sealing ring in contact with the valve body or the valve cover is further provided on the inner side surface of the ring sleeve, so that visible particles capable of contacting the medium and changing are provided inside the ring plate.

[0008] Preferably, the spring is in the shape of a pagoda. The diameter of the lower end of the spring is adapted to the small-diameter part so that there is friction between it and the annular surface of the small-diameter part. A positioning post is integrally formed on the lower side surface of the closing disc. The spring is sleeved outside the positioning post, and the outer side surface of the positioning post is in contact with the spring.

[0009] Preferably, an upwardly penetrating annular groove is provided in the annular surface of the large-diameter part. A first sealing ring is provided in the annular groove. A protruding ring is integrally formed on the outer side surface of the valve cover. The first sealing ring is squeezed by the lower side surface of the protruding ring and the outer side surface of the valve cover.

[0010] Preferably, the material constituting the first sealing ring is one of PTFE and RPTFE.

[0011] Preferably, a bracket is provided in the liquid inlet flow channel. A positioning bolt is rotatably connected inside the bracket. The positioning bolt extends to the lower side of the bracket and an internal thread sleeve is externally threaded on the positioning bolt. A sliding groove for accommodating the internal thread sleeve and enabling it to slide up and down is provided in the upper side surface of the closing disc.

[0012] Preferably, the lower end of the internal thread sleeve is also connected to the lower end of the sliding groove by a rope. The diameter of the middle-diameter part gradually increases in the downward direction.

[0013] Preferably, a limiting plate is provided on the upper side surface of the bracket. The limiting plate is fixed to the upper side of the bracket by a fixing screw. A clamping sleeve for clamping the positioning bolt is also fixedly provided on the side surface of the limiting plate.

[0014] Preferably, the center of the closing disc protrudes upward to increase the depth of the sliding groove.

[0015] Preferably, a pull ring is provided at the lower end of the positioning post.

[0016] Preferably, the valve body and the valve cover are made of CF8 material, and the spring is made of SS304 material.

[0017] The present invention provides a hard-sealed check valve with a leak detection function, having the following beneficial effects:

[0018] The present invention performs the sealing work between the valve body and the valve cover through hard sealing. Hard sealing has the advantages of long service life, high temperature resistance, and corrosion resistance;

[0019] In view of the defect of poor sealing performance of the hard seal, the present invention is provided with a leak detection assembly outside the valve body and the valve cover. When a liquid leakage phenomenon occurs, the flowing medium will react with the replaceable visible particles in the leak detection assembly, facilitating the staff to observe the liquid leakage phenomenon;

[0020] The staff can adjust the function of the present invention by rotating the positioning bolt, that is, it can be switched between bidirectional flow and unidirectional flow, and the staff can adjust the maximum flow rate per unit time of the present invention during unidirectional flow by rotating the positioning bolt, which is easy to control. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the present invention;

[0022] Figure 2 is Figure 1 an enlarged schematic view of the sealing disc and the bracket in;

[0023] Figure 3 is Figure 1 an enlarged schematic view of the position A in.

[0024] In the figure:

[0025] 11. Valve body; 12. Valve cover; 13. Liquid inlet channel; 14. Liquid outlet channel; 15. Sealing disc; 16. Spring; 17. Positioning column; 18. First sealing ring; 19. Protruding ring; 21. Ring sleeve; 22. Ring plate; 23. Bracket; 24. Positioning bolt; 25. Internal thread sleeve; 26. Rope; 27. Limiting plate; 28. Fixing screw; 29. Second sealing ring; 30. Chute; 31. Pulling ring; 50. First thread part; 51. Large diameter part; 52. Middle diameter part; 53. Small diameter part; 54. Ring; 55. Second thread part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] In the present invention, unless otherwise clearly defined and limited, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Referring to Figures 1-3 , according to an embodiment of a hard-sealed check valve with a leak detection function of the present invention, it includes a valve body 11 and a valve cover 12. An inlet liquid flow channel 13 is provided in the valve body 11, and a first threaded portion 50 is provided in the inlet liquid flow channel 13. An outlet liquid flow channel 14 is provided in the valve cover 12. From top to bottom, the outlet liquid flow channel 14 is composed of a large-diameter portion 51, a medium-diameter portion 52, a small-diameter portion 53, and a second threaded portion 55. The valve cover 12 is fixed in the large-diameter portion 51 so that the inlet liquid flow channel 13 and the outlet liquid flow channel 14 are communicated. A closing disc 15 is slidably connected up and down in the medium-diameter portion 52. The diameter of the closing disc 15 is smaller than the diameter of the medium-diameter portion 52 but larger than the diameter of the inlet liquid flow channel 13. An inner ring 54 is provided on the side surface of the small-diameter portion 53. A spring 16 is placed in contact with the upper side surface of the ring 54. The upper end of the spring 16 is connected to the lower side surface of the closing disc 15. In the initial state, the closing disc 15 will abut against the lower side surface of the valve body 11 under the action of the spring 16 and close the inlet liquid flow channel 13 to prevent the medium from flowing back, that is, to prevent the medium from being blocked by the closing disc 15 when attempting to flow into the inlet liquid flow channel 13 through the outlet liquid flow channel 14. When the medium flows into the outlet liquid flow channel 14 through the inlet liquid flow channel 13, it will impact the closing disc 15 and cause it to move downward and no longer abut against the valve body 11. At this time, the medium can flow out through the gap between the closing disc 15 and the medium-diameter portion 52 and through the outlet liquid flow channel 14.

[0031] The spring 16 is preferably a conical spring. The conical spring can prevent the middle part from bending when it is compressed, so as not to affect the elastic force. The diameter of the lower end of the spring 16 is adapted to the small-diameter part 53 so that there is friction between it and the annular surface of the small-diameter part 53. A positioning post 17 is integrally formed on the lower side surface of the closed disc 15. The spring 16 is sleeved outside the positioning post 17, and the outer side surface of the positioning post 17 contacts the spring 16, which increases the stability.

[0032] The valve body 11 and the valve cover 12 can be fixed to each other by welding or a plurality of bolts. In order to increase the sealing performance and prevent liquid leakage at the connection between the valve body 11 and the valve cover 12, an upwardly penetrating annular groove is provided in the annular surface of the large-diameter part 51. A first sealing ring 18 is provided in the annular groove. A protruding ring 19 is integrally formed on the outer side surface of the valve cover 12. The first sealing ring 18 is squeezed by the lower side surface of the protruding ring 19 and the outer side surface of the valve cover 12. The material of the first sealing ring 18 is preferably one of PTFE and RPTFE to form a hard seal. The first sealing ring 18 of this material is resistant to high temperature and corrosion, and will not adhere to the contact surface, and has good stability. Of course, a rubber material can also be selected.

[0033] In the second embodiment, the difference from the above embodiment is that a leak detection assembly is further provided outside the valve body 11 and the valve cover 12. The leak detection assembly includes two ring sleeves 21 and a transparent ring plate 22 connected to the outer annular surfaces of the two ring sleeves 21. The sizes of the two ring sleeves 21 are different and are respectively sleeved on the outer sides of the valve body 11 and the valve cover 12. Visible particles that can change when contacting the medium are provided between the ring plate 22 and the two ring sleeves 21. The visible particles are replaced according to the use environment and can be anhydrous copper sulfate or other active metal particles. If the medium in the liquid inlet pipe 13 and the liquid outlet pipe 14 breaks through the seal of the first sealing ring 18, it will react with the visible particles located in the ring plate 22 to consume the visible particles or cause them to absorb water and change color, so as to facilitate the staff to observe and perform maintenance in time;

[0034] In order to prevent the visible particles from reacting with water or other substances in the air, the inner annular surfaces of the two ring sleeves 21 are also connected to the outer annular surface of the valve body 11 or the valve cover 12 through a second sealing ring 29.

[0035] In the third embodiment, the difference from the above two embodiments is that: a bracket 23 is provided in the liquid inlet flow channel 13. A positioning bolt 24 is rotatably connected in the bracket 23. The positioning bolt 24 extends to the lower side of the bracket 23 and an internally threaded sleeve 25 is externally threaded on the positioning bolt 24. A sliding groove 30 for accommodating the internally threaded sleeve 25 is provided in the upper side surface of the closed disc 15. The internally threaded sleeve 25 has multiple functions:

[0036] 1. The internal thread sleeve 25 can slide within the chute 30 and can prevent the closing disc 17 from swinging during the up and down movement, ensuring that it can accurately contact the lower end of the valve body 11 and close the liquid inlet channel 13 when moving upward to reset.

[0037] 2. The staff can rotate the positioning bolt 24 to move the internal thread sleeve 25 to the lower limit. At this time, the internal thread sleeve 25 can abut against the lower end of the chute 30 and push the closing plate 15 to no longer abut against the valve body 11. At this time, a hard-sealed check valve with a leak detection function of the present invention no longer has the check valve function but serves as a connector for transporting fluids.

[0038] 3. The diameter of the middle diameter part 52 gradually increases in the downward direction. The greater the sinking distance of the closing plate 15, the greater the amount of fluid passing through the gap between the closing plate 15 and the wall surface of the middle diameter part 52 per unit time. The lower end of the internal thread sleeve 25 is also connected to the lower end of the chute 30 through a rope 26. At this time, the up and down position of the internal thread sleeve 25 can control the maximum sinking distance of the closing plate 15 through the rope 26. When the rope 26 is straightened, the closing plate 15 moves to the lowest position, that is, the staff can rotate the positioning bolt 24 to control the maximum flow rate through the liquid inlet channel 13.

[0039] A pull ring 31 is provided at the lower end of the positioning post 17. After the staff adjusts the up and down position of the internal thread sleeve 25, the rope 26 can be straightened by pulling the pull ring 31. At this time, the staff can insert a measuring ruler into the liquid inlet channel 13 and abut against the closing disc 15, and then convert the maximum flow rate according to the position of the closing disc 15.

[0040] The upper side of the closing disc 15 protrudes upward to increase the depth of the chute 30. Of course, the chute 30 extends into the positioning post 17 to further increase the depth.

[0041] To prevent the positioning bolt 24 from automatically rotating under the impact of the fluid, a limiting plate 27 is provided on the upper side of the bracket 23. The limiting plate 27 is fixed to the upper side of the bracket 23 by a fixing screw 28. A sleeve for clamping the positioning bolt 24 is also fixedly provided on the side surface of the limiting plate 27. The sleeve is provided with an inner hexagonal cavity adapted to the shape of the nut in the positioning bolt 24. When the fixing screw 28 fixes the limiting plate 27, the nut of the positioning bolt 24 will be stuck in the cavity to prevent rotation.

[0042] The valve body 11 and the valve cover 12 are made of CF8 material, and the spring 16 is made of SS304 material. Both are stainless steels, which further improves the service life and corrosion resistance. Moreover, the spring 16 can be further upgraded to SS316.

[0043] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any changes or modifications made by those skilled in the art within the scope of the present invention are covered by the patent scope of the present invention.

Claims

1. A hard-sealed check valve with a leak detection function, comprising a valve body (11) and a valve cover (12), Characterized in that: An inlet liquid flow channel (13) is provided in the valve body (11), a first threaded portion (50) is provided in the inlet liquid flow channel (13), an outlet liquid flow channel (14) is provided in the valve cover (12), and from top to bottom, the outlet liquid flow channel (14) is composed of a large-diameter portion (51), a medium-diameter portion (52), a small-diameter portion (53) and a second threaded portion (55). The valve cover (12) is fixed in the large-diameter portion (51) so that the inlet liquid flow channel (13) and the outlet liquid flow channel (14) are communicated; A closing disc (15) is slidably connected up and down in the medium-diameter portion (52). The diameter of the closing disc (15) is smaller than the diameter of the medium-diameter portion (52) but larger than the diameter of the inlet liquid flow channel (13). An inner ring (54) is provided on the side surface of the small-diameter portion (53). A spring (16) is placed against the upper side surface of the ring (54). The upper end of the spring (16) is connected to the lower side surface of the closing disc (15) so that the closing disc (15) can abut against the lower side surface of the valve body (11) and close the inlet liquid flow channel (13); It further includes two ring sleeves (21) and a transparent ring plate (22). The ring plate (22) connects the two ring sleeves (21). The sizes of the two ring sleeves (21) are different and are respectively sleeved on the outer sides of the valve body (11) and the valve cover (12). A second sealing ring (29) in contact with the valve body (11) or the valve cover (12) is further provided on the inner side surface of the ring sleeve (21) so that visible particles that can contact the liquid and change are provided in the ring plate (22).

2. A hard-sealed check valve with a leak detection function according to claim 1, Characterized in that: The spring (16) is in the shape of a pagoda. The diameter of the lower end of the spring (16) is adapted to the small-diameter portion (53) so that there is friction between it and the annular surface of the small-diameter portion (53). A positioning post (17) is integrally formed on the lower side surface of the closing disc (15). The spring (16) is sleeved outside the positioning post (17), and the outer side surface of the positioning post (17) is in contact with the spring (16).

3. A hard-sealed check valve with a leak detection function according to claim 1, Characterized in that: An upwardly penetrating annular groove is provided in the annular surface of the large-diameter portion (51). A first sealing ring (18) is provided in the annular groove. A protruding ring (19) is integrally formed on the outer side surface of the valve cover (12). The first sealing ring (18) is squeezed by the lower side surface of the protruding ring (19) and the outer side surface of the valve cover (12).

4. A hard-sealed check valve with a leak detection function according to claim 3, Characterized in that: The material constituting the first sealing ring (18) is one of PTFE and RPTFE.

5. A hard-sealed check valve with a leak detection function according to claim 1, Characterized in that: A bracket (23) is provided in the liquid inlet flow channel (13). A positioning bolt (24) is rotatably connected inside the bracket (23). The positioning bolt (24) extends to the lower side of the bracket (23), and an internally threaded sleeve (25) is externally threaded to the positioning bolt (24). A chute (30) for accommodating the internally threaded sleeve (25) and enabling it to slide up and down is provided in the upper side surface of the closing disc (15).

6. A hard-sealed check valve with a leak detection function according to claim 5, characterized in that: The lower end of the internally threaded sleeve (25) is also connected to the lower end of the chute (30) by a rope (26), and the diameter of the middle diameter part (52) gradually increases in the downward direction.

7. A hard-sealed check valve with a leak detection function according to claim 5, characterized in that: A limiting plate (27) is provided on the upper side surface of the bracket (23). The limiting plate (27) is fixed to the upper side of the bracket (23) by a fixing screw (28), and a clamping sleeve for clamping the positioning bolt (24) is also fixedly provided on the side surface of the limiting plate (27).

8. A hard-sealed check valve with a leak detection function according to claim 6, characterized in that: The center of the closing disc (15) protrudes upward to increase the groove depth of the chute (30).

9. A hard-sealed check valve with a leak detection function according to claim 2, characterized in that: A pull ring (31) is provided at the lower end of the positioning post (17).

10. A hard-sealed check valve with a leak detection function according to claim 1, characterized in that: The valve body (11) and the valve cover (12) are made of CF8 material, and the spring (16) is made of SS304 material.

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