CN216895977U

CN216895977U - Vacuum protection valve

Info

Publication number: CN216895977U
Application number: CN202122770175.9U
Authority: CN
Inventors: 刘新文; 刘楚扬
Original assignee: Toyo Nijima Stainless Steel Zhaoqing Co ltd
Current assignee: Toyo Nijima Stainless Steel Zhaoqing Co ltd
Priority date: 2021-11-12
Filing date: 2021-11-12
Publication date: 2022-07-05
Anticipated expiration: 2031-11-12

Abstract

The utility model discloses a vacuum protection valve, which comprises a valve body, a valve core, a valve seat and a sealing piece, wherein the valve core is arranged on the valve body; the valve seat is connected to the lower side of the valve body, an air inlet cavity is formed in the valve seat, the valve seat is communicated with the external space through a plurality of overflowing holes, an air inlet is formed at the joint of the valve seat and the valve body, and a valve seat sealing surface is formed on the upper edge of the valve seat; the valve core is arranged in the valve body and is matched with the sealing surface of the valve seat to open or close the air inlet; a central guide pipe is also arranged in the valve seat; and the valve core is sealed with the valve seat through a valve face sealing ring on the sealing face of the valve seat. By adopting the heavy hammer type valve core structure, the opening pressure can be adjusted according to the weight of the valve core, and is constant without deviation; the surface of the valve seat sealing ring is sprayed with a polytetrafluoroethylene coating, so that the situation that the valve core cannot act due to the adhesion of the valve core and the valve seat caused by the aging of the sealing ring is prevented. The valve core is completely wrapped inside the valve body, so that sealing failure caused by foreign matters falling on a sealing surface of the valve core is avoided, and the valve core is guided by the center and has a forced pneumatic opening function.

Description

Vacuum protection valve

Technical Field

The utility model relates to the technical field of valve body structures, in particular to a vacuum protection valve which is applied to an automatic overpressure (negative pressure) protection device and used for protecting a storage tank when the storage tank is in abnormal vacuum.

Background

The vacuum protecting valve is one automatic overpressure (negative pressure) protector for storage tank to prevent the pressure in the storage tank from exceeding the designed allowable value and to protect the safety of equipment and personnel. The working principle is as follows: when the pressure in the tank is reduced to negative pressure and reaches the set negative pressure, the valve core is pushed upwards under the action of the atmospheric pressure outside the tank, and the atmosphere enters the tank. The set pressure is adjusted based on the weight of the spool. The existing vacuum protection valve has the advantages of unreasonable structural design, few functions, incapability of well meeting the automatic overpressure (negative pressure) protection requirement of the existing storage tank, inconvenience in maintenance and easy aging and failure to lose the protection function.

SUMMERY OF THE UTILITY MODEL

The utility model provides a vacuum protection valve aiming at the problems existing in the background and the prior art method, and the technical scheme of the utility model is as follows:

a vacuum protection valve comprises a valve body, a valve core, a valve seat and a sealing piece; the valve seat is connected to the lower side of the valve body, an air inlet cavity is formed in the valve seat, the valve seat is communicated with the external space through a plurality of overflowing holes, an air inlet is formed at the joint of the valve seat and the valve body, and a valve seat sealing surface is formed on the upper edge of the valve seat; the valve core is arranged in the valve body and is matched with the sealing surface of the valve seat to open or close the air inlet; a central guide pipe is further arranged inside the valve seat, extends along the direction of the valve body and is connected with the valve core; the sealing element comprises a valve face sealing ring arranged on the sealing face of the valve seat and is used for realizing the sealing between the valve core and the valve seat.

As a further illustration of the utility model, the surface of the valve face sealing ring is sprayed with a polytetrafluoroethylene coating.

Furthermore, the valve also comprises a forced opening device which is connected to the lower side of the valve seat and is connected with the valve core through the central guide pipe.

Furthermore, the central guide pipe is arranged along the central line direction of the valve seat and the forced opening device and is used as a guide shaft of the valve core, the valve core comprises a sleeve rod extending towards the valve seat, and the sleeve rod is sleeved on the upper part of the central guide pipe, so that the valve core can move up and down along the axis.

Furthermore, the excircle of the upper part of the central guide pipe is provided with a spiral groove, and the length of the spiral groove on the axis is more than or equal to the length of the sleeve sleeved by the central guide pipe.

Furthermore, the sleeve rod penetrates through the center of the air inlet to enable the air inlet to form an annular air inlet, and the total area of a plurality of overflowing holes formed in the outer circle of the valve seat 5 is larger than the annular area of the air inlet between the valve seat and the valve core.

Furthermore, a cleaning pipe used for cleaning the interior of the valve body is arranged in the valve body.

Further, the cleaning pipe is disposed on a moving path of the valve core, and limits a lifting height of the valve core.

Furthermore, the disk seat with the connection can be dismantled to the valve body, fastens both together through the clamp, the sealing member contains the valve body sealing washer, sets up the disk seat with between the valve body the clamp is locked the back and is realized sealing between disk seat and the valve body.

Furthermore, the vacuum protection valve is also provided with an inductive switch which is arranged in the central guide pipe and is used for detecting the position state of the valve core.

The utility model has the beneficial effects that:

the utility model adopts the weight type valve core structure, can adjust the opening pressure according to the weight of the valve core, and has constant opening pressure without deviation. The surface of the valve seat sealing ring is sprayed with a polytetrafluoroethylene coating, so that the phenomenon that the valve core cannot act due to the adhesion of the valve core and the valve seat because the sealing ring is aged is prevented. The valve core is completely wrapped inside the valve body, so that sealing failure caused by foreign matters falling on a sealing surface of the valve core is avoided, the valve core is guided by the center and has a forced pneumatic opening function and an opening feedback function, and a special cleaning nozzle device is arranged in the valve to ensure that the inside of the valve can be completely cleaned.

Drawings

FIG. 1 is a partial schematic view of an embodiment of the present invention;

FIG. 2 is a schematic view of the total area of the flow holes and the annular area of the inlet of FIG. 1;

fig. 3 is a schematic illustration of the gas flow in overpressure protection according to the utility model.

Reference numerals: the valve comprises a valve body 1, a cleaning pipe 2, a valve core 3, a hoop 4, a valve seat 5, a central guide pipe 6, a forced opening device 7, an overflowing hole 8 and an annular area 9.

Detailed Description

Example (b):

the embodiments of the present invention will be described in detail with reference to the accompanying drawings, and it is to be understood that the described embodiments are merely a part of the embodiments of the utility model, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

A vacuum protection valve comprises a valve body 1, a valve core 3, a valve seat 5 and a sealing element; the valve seat 5 is connected to the lower side of the valve body 1, an air inlet cavity is formed in the valve seat 5, the valve seat is communicated with an external space through a plurality of overflowing holes 8, an air inlet is formed at the joint of the valve seat 5 and the valve body 1, and a valve seat sealing surface is formed on the upper edge of the valve seat 5; the valve core 3 is arranged in the valve body 1 and is matched with the sealing surface of the valve seat to open or close the air inlet; a central guide pipe 6 is further arranged inside the valve seat 5, and the central guide pipe 6 extends along the direction of the valve body 1 and is connected with the valve core 3; the sealing element comprises a valve face sealing ring arranged on the sealing face of the valve seat and is used for realizing the sealing between the valve core 3 and the valve seat 5. The vacuum protection valve of the embodiment is used for automatic overpressure (negative pressure) protection of a storage tank, and an air inlet cavity of the valve body 1, which is communicated with a valve seat 5 in the storage tank, is communicated with an external space during installation. Under normal conditions, referring to the attached drawing 1, the valve core 3 is pressed on the valve seat sealing surface under the action of self gravity, the valve surface sealing element on the valve seat sealing surface realizes the sealing effect and cuts off the communication between the interior of the storage tank and the external space, at the moment, even if a certain negative pressure exists in the storage tank, the valve core 3 can close the air inlet to maintain the closed state of the storage tank as long as the pressure difference with the atmospheric pressure is not enough to push the valve core 3 open. When the negative pressure in the storage tank is reduced to a certain degree and reaches a preset value (the set pressure is adjusted according to the weight of the valve core 3), the valve core 3 is pushed upwards under the action of the atmospheric pressure outside the tank, the atmospheric pressure enters the tank, and the internal pressure of the storage tank is increased; along with the continuous rising of pressure, when reaching another predetermined value, case 3 descends automatically under the action of gravity and closes the air inlet, and the valve closes automatically again, prevents the atmosphere to continue to flow in, guarantees the operating pressure in the storage tank.

In order to ensure reliable opening performance of the vacuum protection valve, preferably, the valve face sealing ring is coated with a polytetrafluoroethylene coating, so that the phenomenon that the valve core 3 cannot act due to adhesion of the valve core 3 and the valve seat 5 caused by aging of the valve face sealing ring is prevented.

Preferably, the vacuum protection valve is provided with a forced opening device 7, the forced opening device 7 is connected to the lower side of the valve seat 5 and is connected with the valve core 3 through the central guide pipe 6, when the valve is cleaned and before a storage tank is cleaned or discharged, the valve core 3 is forcibly separated from the valve seat 5, the sealing surface can be cleaned, and the sensitivity of the valve action can be ensured. Specifically, referring to fig. 1 to 3, the center guide tube 6 is provided along the center line direction of the valve seat 5 and the forcible opening device 7 and serves as a guide shaft of the valve body 3 so that the valve body 3 can move up and down along the center axis. When necessary, the central guide pipe 6 can be driven to axially move by the forced opening device 7, so that the valve core 3 is pushed to move upwards to open the air inlet, the function of forced opening is achieved, and the valve body 1 and the storage tank can be maintained and overhauled conveniently. Specifically, in this embodiment, the valve element 3 includes a sleeve rod extending in the direction of the valve seat 5, and the sleeve rod is sleeved on the upper portion of the central guide pipe 6, so that the valve element 3 can move up and down along the axis, and the forced opening device 7 can accurately act on the valve element 3 when acting, thereby ensuring the forced opening function.

In a preferred embodiment, a spiral groove is machined on the outer circle of the upper part of the central guide pipe 6, and when the valve core 3 moves up and down, the vacuum or pressure-holding condition of a cavity between the valve core 3 and the central guide pipe 6 can be avoided. It is easy to understand that the length of the spiral groove on the axis is greater than or equal to the length of the sleeve sleeved by the central guide tube 6, so as to ensure that the spiral groove can realize the technical functions and effects in the embodiment scheme.

Referring to fig. 2, the valve core 3 of the above embodiment includes a sleeve rod passing through the center of the inlet port, so that the inlet port actually forms an annular inlet port. In order to ensure that the vacuum protection valve can quickly supplement air under the condition of overpressure, the total area of a plurality of overflowing holes 8 arranged on the outer circle of the valve seat 5 is preferably larger than the annular area 9 of an air inlet between the valve seat 5 and the valve core 3.

In this embodiment, a cleaning pipe 2 is arranged in the valve body 1 and is used for cleaning the inside of the valve body 1, and preferably, the cleaning pipe 2 is arranged on a moving path of the valve element 3, so that the cleaning pipe can clean the inside of the valve body 1 and limit the lifting height of the valve element 3 (the length of the valve element 3 matched with the central guide pipe 6 cannot be exceeded).

In this embodiment, disk seat 5 with valve body 1 can dismantle the connection, fastens both together through clamp 4, the sealing member contains the valve body sealing washer, sets up disk seat 5 with between the valve body 1 it is sealed between disk seat 5 and the valve body 1 to realize after the locking of clamp 4.

In some embodiments, the vacuum protection valve is further provided with an inductive switch, which is arranged inside the central guide tube 6 and is used for detecting the position state of the valve core 3, and if necessary, a feedback signal can be formed for realizing remote monitoring control.

Preferably, the valve body 1, the cleaning pipe 2, the valve body 3, the clip 4, the valve seat 5, the center guide pipe 6, and the forced opening device 7 are metal members.

The foregoing is illustrative of the preferred embodiments of the present invention only and is not to be construed as limiting the claims. The utility model is not limited to the above embodiments, the specific construction of which allows variations, and in any case variations, which are within the scope of the utility model as defined in the independent claims.

Claims

1. A vacuum protection valve characterized by: comprises a valve body, a valve core, a valve seat and a sealing element; the valve seat is connected to the lower side of the valve body, an air inlet cavity is formed in the valve seat, the valve seat is communicated with the external space through a plurality of overflowing holes, an air inlet is formed at the joint of the valve seat and the valve body, and a valve seat sealing surface is formed on the upper edge of the valve seat; the valve core is arranged in the valve body and is matched with the sealing surface of the valve seat to open or close the air inlet; a central guide pipe is further arranged inside the valve seat, extends along the direction of the valve body and is connected with the valve core; the sealing element comprises a valve face sealing ring arranged on the sealing face of the valve seat and is used for realizing the sealing between the valve core and the valve seat.

2. The vacuum protection valve of claim 1, wherein: and a polytetrafluoroethylene coating is sprayed on the surface of the valve face sealing ring.

3. The vacuum protection valve according to claim 1 or 2, wherein: the valve seat is characterized by further comprising a forced opening device, wherein the forced opening device is connected to the lower side of the valve seat and is connected with the valve core through the central guide pipe.

4. The vacuum protection valve of claim 3, wherein: the central guide pipe is arranged along the central line direction of the valve seat and the forced opening device and is used as a guide shaft of the valve core, the valve core comprises a sleeve rod extending towards the valve seat, and the sleeve rod is sleeved on the upper part of the central guide pipe, so that the valve core can move up and down along the axis.

5. The vacuum protection valve of claim 4, wherein: the excircle of the upper part of the central guide pipe is provided with a spiral groove, and the length of the spiral groove on the axis is more than or equal to the length of the sleeve sleeved by the central guide pipe.

6. The vacuum protection valve of claim 4, wherein: the sleeve rod penetrates through the center of the air inlet to enable the air inlet to form an annular air inlet, and the total area of a plurality of overflowing holes formed in the outer circle of the valve seat is larger than the annular area of the air inlet between the valve seat and the valve core.

7. The vacuum protection valve of claim 3, wherein: and a cleaning pipe used for cleaning the interior of the valve body is arranged in the valve body.

8. The vacuum protection valve of claim 7, wherein: the cleaning pipe is arranged on a moving path of the valve core and limits the lifting height of the valve core.

9. The vacuum protection valve of claim 3, wherein: the disk seat with the connection can be dismantled to the valve body, is in the same place through the clamp fastening both, the sealing member contains the valve body sealing washer, sets up the disk seat with between the valve body it is sealed between disk seat and the valve body to realize after the clamp locking.

10. The vacuum protection valve of claim 3, wherein: the vacuum protection valve is also provided with an inductive switch which is arranged in the central guide pipe and used for detecting the position state of the valve core.