Breather valve with interchangeable valve seat

Abstract

The utility model discloses a breather valve with an interchangeable valve seat, and relates to the field of petrochemical engineering. The breather valve comprises a valve body, a valve cover and a valve disc assembly, the valve cover is installed at the top of the valve body, the valve disc assembly comprises a positive pressure valve disc and a negative pressure valve disc, the positive pressure valve disc is arranged on a positive pressure valve seat in the valve body, a micro-leakage structure is arranged between the positive pressure valve disc and the negative pressure valve seat, the negative pressure valve disc is arranged on a negative pressure valve seat 9 in the valve body, and a micro-leakage structure is also arranged between the negative pressure valve seat 9 and the positive pressure valve disc. The micro-leakage structure comprises sealing grooves, sealing gaskets and leakage channels, the sealing grooves and the leakage channels are formed in the top of the positive pressure valve seat and the top of the negative pressure valve seat, the sealing gaskets are arranged at the bottom of the positive pressure valve disc and the bottom of the negative pressure valve disc, the sealing grooves are composed of a plurality of eccentric annular grooves, and the leakage channels are close to the sealing grooves and communicate with the sealing grooves. According to the utility model, the sealing groove is matched with the leakage channel to realize a micro pressure relief function, so that the valve disc is prevented from vibrating when gas pressure borne by the valve disc is close to an opening threshold value, and the problem of noise is solved.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, in particular to a breathing valve with an interchangeable valve seat. Background Art

[0002] A breathing valve is a valve that ensures that the storage tank space is isolated from the atmosphere within a certain pressure range, and is connected to the atmosphere (breathing) when the pressure exceeds or falls below this pressure range. Its function is to prevent the storage tank from being damaged due to overpressure or vacuum, and at the same time reduce the evaporation loss of the stored liquid.

[0003] Chinese patent document CN107420597A discloses an intelligent breathing valve, which consists of an outer valve body, an inner valve body, a valve core and a drive device; the inner valve body is fixedly installed in the outer valve body through an assembly column; the valve core is installed in the inner valve body; the drive device is installed on one side of the valve core through a lifting cylinder; the drive device is movably connected to the valve core. The patent document achieves the purpose of autonomously adjusting the internal pressure of the tank body and stabilizing the pressure within a certain range by controlling the upper valve core and the lower valve core switch. However, in the patent document, since the valve seat and the valve body are an integrated structure, when the gas pressure in the storage tank reaches the vicinity of the opening threshold of the positive pressure valve disc or the negative pressure valve disc, the positive pressure valve disc or the negative pressure valve disc may produce a "trembling" phenomenon, emitting a great noise, which makes people uncomfortable. And when the valve seat and the valve disc collide for a long time, the gap between the two will expand, resulting in the inability to form an effective seal. At the same time, since there is no way to replace the valve seat, in order to ensure the sealing effect, the breathing valve can only be replaced as a whole, which greatly increases the maintenance cost. Utility Model Content

[0004] In view of the problem that the valve disc of the above-mentioned existing breathing valve is prone to vibrate and generate noise when near the opening threshold, and the valve seat cannot be replaced after long-term use, which increases maintenance costs, the utility model provides a breathing valve with an interchangeable valve seat.

[0005] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A breathing valve with an interchangeable valve seat comprises a valve body, a valve cover and a valve disc assembly, wherein the valve body comprises a valve body shell and a valve body inner shell, wherein the valve body inner shell is located inside the valve body shell, and the valve cover is adapted to fit on the top of the valve body outer shell, and the valve disc assembly comprises a positive pressure valve disc and a negative pressure valve disc, wherein the positive pressure valve disc is arranged on the positive pressure valve seat at the top of the valve body inner shell, and the negative pressure valve disc is arranged on the negative pressure valve seat at the bottom of the valve body inner shell. A micro-leakage structure is arranged between the positive pressure valve disc and the positive pressure valve seat, and between the negative pressure valve disc and the negative pressure valve seat, wherein the micro-leakage structure comprises a sealing groove, a sealing gasket and a leakage channel, wherein the sealing gasket contacts the top surface of the sealing groove to form a seal, and the leakage channel is close to the sealing groove and communicates with the sealing groove.

[0007] Furthermore, the sealing groove and the leakage channel are located at the top of the positive pressure valve seat and the top of the negative pressure valve seat, and the sealing gasket is located at the bottom of the positive pressure valve disc and the bottom of the negative pressure valve disc.

[0008] Furthermore, the sealing groove is composed of a plurality of eccentric annular grooves, and the eccentric annular grooves intersect with each other.

[0009] Further, the leakage channel includes a plurality of first leakage channels and a plurality of second leakage channels, each of the first leakage channels is located on the positive pressure valve seat and communicates with an eccentric annular groove located outside the sealing groove, and each of the second leakage channels is located on the negative pressure valve seat and communicates with an eccentric annular groove located inside the sealing groove.

[0010] Further, the bottom of the positive pressure valve seat has a thread, and the positive pressure valve seat is threadedly connected to the top of the inner shell of the valve body. The bottom of the negative pressure valve seat has a thread, and the positive pressure valve seat is threadedly connected to the bottom of the inner shell of the valve body.

[0011] Furthermore, the bottoms of the positive-pressure valve disc and the negative-pressure valve disc each have a plurality of recessed pits, and the cross-section of each of the recesses is arc-shaped.

[0012] Furthermore, the plurality of recesses are divided into a first group and a second group, the first group and the second group surround the axis of the positive pressure valve disc, and the first group and the second group surround the axis of the negative pressure valve disc.

[0013] Furthermore, the valve disc assembly further comprises a first valve stem, a second valve stem, a first counterweight disc and a second counterweight disc, the positive pressure valve disc and the first counterweight disc are fixed on the first valve stem, the bottom of the valve cover has a guide sleeve, and the first valve stem is adapted to move along the guide sleeve. The negative pressure valve disc and the second counterweight disc are fixed on the second valve stem, the bottom of the negative pressure valve seat has a limiter, the limiter has a through hole, the second valve stem is adapted to be inserted into the through hole, and moves along the through hole.

[0014] Furthermore, an outlet reducer is fixed to one side of the inner shell of the valve body, and the outlet reducer passes through the outer shell of the valve body.

[0015] Furthermore, a connecting flange is detachably fixed to the bottom of the valve body shell.

[0016] The beneficial effects of the utility model are as follows: the utility model realizes the micro-pressure relief function by cooperating with the sealing groove and the leakage channel, thereby preventing the valve disc from vibrating when the gas pressure on the valve disc is near the opening threshold value, and solving the noise problem. The valve seat and the inner shell of the valve body in the utility model adopt a split design to realize the convenient replacement of the valve seat, so that the breathing valve that originally needed to be scrapped can now meet the normal use only by replacing the valve seat, which greatly reduces the user's maintenance cost. The bottom of the valve disc in the utility model is provided with a plurality of pits, which is conducive to increasing the friction between the valve disc and the airflow, thereby increasing the opening height of the valve disc, and then increasing the ventilation volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a schematic diagram of the structural principle of an implementation method of the utility model.

[0018] Figure 2 Shown Figure 1 Top view of the .

[0019] Figure 3 Shown Figure 2 Cross-sectional view at point A in the middle.

[0020] Figure 4 Shown Figure 3 Side view of .

[0021] Figure 5 Shown is a structural schematic diagram of a positive pressure valve seat.

[0022] Figure 6 Shown Figure 5 Top view of the .

[0023] Figure 7 Shown is a schematic structural diagram of a negative pressure valve seat.

[0024] Figure 8 Shown Figure 7 Top view of the . DETAILED DESCRIPTION

[0025] The utility model discloses a breathing valve with an interchangeable valve seat. An implementation manner of the utility model is specifically described below in conjunction with the accompanying drawings.

[0026] Combination Figure 1 and Figure 2 As shown, the breathing valve includes a valve body, a valve cover 3, a positive pressure valve disc assembly and a negative pressure valve disc assembly. The valve body includes a valve body shell 1 and a valve body inner shell 2. The valve cover 3 is detachably fixed to the top of the valve body shell 1. A connecting flange 5 is detachably fixed to the bottom of the valve body shell 1. The breathing valve is connected to the storage tank through the connecting flange 5. Figure 5 and Figure 6As shown, the top of the valve body inner shell 2 is provided with a positive pressure valve seat 6, the bottom outer side of the positive pressure valve seat 6 is provided with a thread, and the positive pressure valve seat 6 is threadedly connected to the top of the valve body inner shell 2, so that the positive pressure valve seat 6 can be easily replaced. Figure 7 and Figure 8 As shown, the bottom of the inner shell 2 of the valve body is provided with a negative pressure valve seat 9, and the outer side of the bottom of the negative pressure valve seat 9 is provided with a thread, and the negative pressure valve seat 9 is threadedly connected with the bottom of the inner shell 2 of the valve body, so as to facilitate the replacement of the negative pressure valve seat 9. An outlet reducer 4 is fixed to one side of the inner shell 2 of the valve body, and one end of the outlet reducer 4 passes through the outer shell 1 of the valve body, and the inner shell 2 of the valve body is connected with the outside through the outlet reducer 4.

[0027] Combination Figure 3 and Figure 4 As shown, the positive pressure valve disc assembly is adapted to the positive pressure valve seat 6, and the positive pressure valve disc assembly includes a positive pressure valve disc 7, a first valve stem 8 and a first counterweight disc. The positive pressure valve disc 7 and the first counterweight disc are sleeved outside the first valve stem 8 and fixed to the first valve stem 8 by a nut. A guide sleeve adapted to the first valve stem 8 is fixed at the center position of the bottom of the valve cover 3, and the upper part of the first valve stem 8 is inserted into the guide sleeve and moves up and down along the guide sleeve. The negative pressure valve disc assembly is adapted to the negative pressure valve seat 9, and the negative pressure valve disc assembly includes a negative pressure valve disc 10, a second valve stem 11 and a second counterweight disc. The negative pressure valve disc 10 and the second counterweight disc are sleeved outside the second valve stem 11 and fixed to the second valve stem 11 by a nut. The bottom of the negative pressure valve seat 9 has a limiter 901, and the limiter 901 has a through hole at the center position. The limiter 901 is sleeved outside the lower part of the second valve stem 11 by using the through hole, and the second valve stem 11 moves up and down along the through hole.

[0028] A micro-leakage structure is provided between the positive pressure valve disc 7 and the positive pressure valve seat 6, and between the negative pressure valve disc 10 and the negative pressure valve seat 9. The micro-leakage structure includes a sealing groove, a sealing gasket 13 and a leakage channel. The sealing groove is composed of a plurality of eccentric annular grooves 14, and each eccentric annular groove 14 intersects with each other. The leakage channel includes a plurality of first leakage channels 15 and a plurality of second leakage channels 16. The top of the positive pressure valve seat 6 has a sealing groove and a first leakage channel 15. The first leakage channel 15 is located outside the sealing groove and communicates with the eccentric annular groove 14 located at the outermost side of the sealing groove. The top of the negative pressure valve seat 9 has a sealing groove and a second leakage channel 16. The second leakage channel 16 is located inside the sealing groove and communicates with the eccentric annular groove 14 located at the innermost side of the sealing groove. The bottom of the positive pressure valve disc 7 and the bottom of the negative pressure valve disc 10 are both bonded with sealing gaskets 13 adapted to the sealing groove, and each sealing gasket 13 is in a circular ring shape. The sealing gasket 13 contacts the top surface of the sealing groove to form a seal, and the sealing gasket 13 is made of elastic material.

[0029] When the positive pressure or negative pressure reaches the opening threshold of the breathing valve, the sealing gasket 13 at the bottom of the positive pressure valve disc 7 and the negative pressure valve disc 10 is slightly deformed under the action of the gas pressure, so that a gap is generated between the sealing gasket 13 and the top surface of the sealing groove, and the gas inside the positive pressure valve seat 6 or the gas outside the negative pressure valve seat 9 enters the sealing groove along the gap and flows along the eccentric annular grooves 14. After passing through the eccentric annular grooves 14, the gas inside the positive pressure valve seat 6 leaks from the first leakage channel 15 to the outside of the positive pressure valve seat 6. After passing through the eccentric annular grooves 14, the gas outside the negative pressure valve seat 9 leaks from the second leakage channel 16 to the inside of the negative pressure valve seat 9. The sealing groove and the leakage channel cooperate to achieve micro-pressure relief, avoid the vibration phenomenon of the gas pressure on the positive pressure valve disc 7 or the negative pressure valve disc 10 when it is near the opening threshold, and reduce noise.

[0030] The bottom surface of the positive pressure valve disc 7 and the bottom surface of the negative pressure valve disc 10 are both provided with a plurality of concave pits 12, each of which has an arc-shaped cross section, and the plurality of pits 12 are divided into a first group arranged evenly in a circle and a second group arranged evenly in a circle. In the positive pressure valve disc 7, the first group is located on the inner side of the second group, and the first and second groups surround the axis of the positive pressure valve disc 7; in the negative pressure valve disc 10, the first group is located on the inner side of the second group, and the first and second groups surround the axis of the negative pressure valve disc 10. Each pit 12 is conducive to increasing the friction between the positive pressure valve disc 7, the negative pressure valve disc 10 and the airflow, thereby increasing the opening height of the positive pressure valve disc 7 and the negative pressure valve disc 10, and then increasing the ventilation volume.

[0031] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A breathing valve with interchangeable valve seats, characterized in that: The invention comprises a valve body, a valve cover (3) and a valve disc assembly, wherein the valve body comprises a valve body shell (1) and a valve body inner shell (2), wherein the valve body shell (2) is located inside the valve body shell (1), and the valve cover (3) is adapted to be mounted on the top of the valve body shell (1); the valve disc assembly comprises a positive pressure valve disc (7) and a negative pressure valve disc (10), wherein the positive pressure valve disc (7) is arranged on a positive pressure valve seat (6) at the top of the valve body inner shell (2), and the negative pressure valve disc (10) is arranged on a negative pressure valve seat (9) at the bottom of the valve body inner shell (2); A micro-leakage structure is provided between the positive pressure valve disc (7) and the positive pressure valve seat (6), and between the negative pressure valve disc (10) and the negative pressure valve seat (9). The micro-leakage structure comprises a sealing groove, a sealing gasket (13) and a leakage channel. The sealing gasket (13) contacts the top surface of the sealing groove to form a seal. The leakage channel is close to the sealing groove and is connected to the sealing groove.

2. A breathing valve with interchangeable valve seats according to claim 1, characterized in that: The sealing groove and the leakage channel are located at the top of the positive pressure valve seat (6) and the top of the negative pressure valve seat (9), and the sealing gasket (13) is located at the bottom of the positive pressure valve disc (7) and the bottom of the negative pressure valve disc (10).

3. A breathing valve with interchangeable valve seats according to claim 2, characterized in that: The sealing groove is composed of a plurality of eccentric annular grooves (14), and the eccentric annular grooves (14) intersect with each other.

4. A breathing valve with interchangeable valve seats according to claim 3, characterized in that: The leakage channel comprises a plurality of first leakage channels (15) and a plurality of second leakage channels (16), each of the first leakage channels (15) being located on the positive pressure valve seat (6) and communicating with an eccentric annular groove (14) located outside the sealing groove; Each of the second leakage channels (16) is located on the negative pressure valve seat (9) and is in communication with an eccentric annular groove (14) located on the inner side of the sealing groove.

5. The breathing valve with interchangeable valve seats according to claim 1, characterized in that: The bottom of the positive pressure valve seat (6) is provided with threads, and the positive pressure valve seat (6) is threadedly connected to the top of the inner shell (2) of the valve body; The bottom of the negative pressure valve seat (9) is provided with threads, and the positive pressure valve seat (6) is threadedly connected to the bottom of the inner shell (2) of the valve body.

6. A breathing valve with interchangeable valve seats according to claim 1, characterized in that: The bottoms of the positive pressure valve disc (7) and the negative pressure valve disc (10) are each provided with a plurality of recessed pits (12), and the cross section of each of the recesses (12) is arc-shaped.

7. A breathing valve with interchangeable valve seats according to claim 6, characterized in that: The plurality of recesses (12) are divided into a first group and a second group. The first group and the second group surround the axis of the positive pressure valve disc (7), and the first group and the second group surround the axis of the negative pressure valve disc (10).

8. The breathing valve with interchangeable valve seats according to claim 1, characterized in that: The valve disc assembly further comprises a first valve stem (8), a second valve stem (11), a first counterweight disc and a second counterweight disc, the positive pressure valve disc (7) and the first counterweight disc are fixed on the first valve stem (8), the bottom of the valve cover (3) has a guide sleeve, and the first valve stem (8) is adapted to move along the guide sleeve; The negative pressure valve disc (10) and the second counterweight disc are fixed on the second valve stem (11); the bottom of the negative pressure valve seat (9) has a limit piece (901); the limit piece (901) has a through hole; the second valve stem (11) is adapted to be inserted into the through hole and move along the through hole.

9. The breathing valve with interchangeable valve seats according to claim 1, characterized in that: An outlet reducer (4) is fixed to one side of the valve body inner shell (2), and the outlet reducer (4) passes through the valve body outer shell (1).

10. The breathing valve with interchangeable valve seats according to claim 1, characterized in that: A connecting flange (5) is detachably fixed to the bottom of the valve body shell (1).

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