TWM594086U - Bidirectional vent valve with inner floating roof - Google Patents

Abstract

A bidirectional vent valve for an inner floating roof includes an outer frame base fixed on the inner floating roof, a sealing cover on the outer frame base, a vent hole box fixed under the sealing cover, and a A floating box surrounded by an air hole box, and a plurality of sliders in a strip shape and fixed to the inner space between the outer frame base, the air hole box and the floating box. Through the liquid, the buoyancy pressure and gravitational difference of the floating tank are switched. When the liquid level rises, the floating tank will push up the sealing cover, so that the annular gas groove is opened to release pressure and ventilation. When the liquid level drops, Attract the floating box to open the sealing cover downwards, so that the central opening of the sealing cover is opened to allow pressure relief and ventilation. These sliding parts are made of non-metallic materials to increase the smoothness of the sliding surface and avoid problems such as temperature and sparks caused by friction between metals.

Description

Two-way vent valve with inner floating roof

The present invention relates to an air valve, especially a bidirectional ventilation valve with an internal floating roof.

The inner floating roof is a liquid storage tank for storing volatile organic compounds. The inner floating roof covers the liquid surface of the liquid storage, and rises and falls with the rise and fall of the liquid surface, so that the effect of greatly reducing the volatilization of the storage liquid can be achieved . Although the liquid storage tank needs to be well sealed to avoid damage caused by volatilization of the liquid storage, the liquid storage tank still needs to generate air flow in the liquid storage tank during the filling and drawing process, so that the liquid storage can enter and exit , And also has the function of regulating pressure.

Referring to FIGS. 1 and 2, a vent valve 1 is generally provided on the inner floating roof. The vent valve 1 is disposed on two spaced-apart floating plates 2 of the inner floating roof, and includes an outer frame base 11 disposed on the floating plates 2 and surrounding a through hole 111 extending vertically A pillar 12 that penetrates the through hole 111 up and down relative to the outer frame base 11 and a cover plate 13 fixed to the top of the pillar 12 and located above the outer frame base 11. The outer frame base 11 has an outer surrounding wall 112 fixed on the floating plates 2, an inner surrounding wall 113 located inside the outer surrounding wall 112 and surrounding the through hole 111, and a connecting outer periphery The wall 112 and the inner surrounding wall 113 define a top wall 115 of a plurality of air holes 114. The outer surrounding wall 112 and the inner surrounding wall 113 cooperate to define an inner space 116 that communicates with the liquid surface downward and communicates with the air holes 114 upward.

The outer frame base 11 will float with the floating plates 2 as the liquid level rises and falls. Usually, the pillar 12 drives the cover plate 13 to press down the top wall 115 due to its own weight, as shown in FIG. 1 The air holes 114 are closed as shown, so that the storage liquid can be prevented from escaping due to volatilization, and the inner floating roof can maintain the sealing function. When maintenance is required and the liquid is drawn out, causing the liquid level to drop substantially to the bottom surface 3 of the liquid storage tank, the bottom end of the pillar 12 will hit the inner bottom surface 3 by impact, causing the pillar 12 and the cover 13 It cannot be lowered anymore. When the outer frame base 11 continues to descend with the floating plates 2, the outer frame base 11 will move downward relative to the pillar 12 and the cover plate 13 as shown in FIG. The cover plate 13 is no longer tight against the top wall 115 to open the air holes 114, so the air can pass through the internal space 116 through the air holes 114 and enter below the inner floating roof to avoid the inner floating roof at the maintenance height Time. There is too much volatile gas volume under the inner floating roof.

However, the vent valve 1 can only be opened when the pillar 12 touches the bottom surface 3 of the liquid storage tank, and the gas and pressure cannot be adjusted outside the maintenance height. During the up and down movement of the pillar 12, the entire outer peripheral surface will rub against the inner surrounding wall 113 of the outer frame base 11. The friction area is too large, causing the metal to make the pillar 12 and the inner surrounding wall 113 easy to wear And, due to vacuum suction, the cover 13 is difficult to open. In addition, the pillar 12 is activated by hitting the inner bottom surface 3 of the liquid storage tank, but generally the inner bottom surface 3 of the liquid storage tank is often uneven, so the pillar 12 is easily skewed after the bottom is touched due to the uneven surface of the contact surface. As a result, the pillar 12 cannot move up and down in a straight up and down manner, which not only makes the stroke unsmooth, but also causes the components of the vent valve 1 to be damaged or inoperable due to excessive wear and pushing.

Therefore, the purpose of the present invention is to provide a vent valve with strong adjustment capability and smooth sliding.

Therefore, the bidirectional vent valve of the inner floating roof of the present invention includes an outer frame base fixed on the inner floating roof, a vent hole box surrounded by the outer frame base and forming a plurality of air holes, and a fixed on the The top surface of the vent box is located above the base of the outer frame and forms an open sealing cover, a floating box located below the sealing cover, and a plurality of sliders in the shape of bars. The vent hole box defines an internal space communicating with the vent holes, and cooperates with the base of the outer frame to define an annular air slot. When the sealing cover is pressed against the outer frame base, the sealing cover closes the annular air groove and the air holes communicate with the annular air groove. When the sealing cover moves upward away from the outer frame base, the annular air groove is opened . The float box is located in the internal space. When the floating box abuts the sealing cover, the floating box closes the opening so that the opening does not communicate with the internal space, and when the floating box moves away from the sealing cover downward, the internal space communicates with the opening. The sliding members are arranged in the annular air groove and the internal space in a strip shape, and the sliding member located in the annular air groove is in sliding contact with one of the outer frame base and the vent hole box, located in the interior The sliding member in the space is in sliding contact with one of the vent box and the floating box.

The effect of the present invention is that when the storage liquid is injected, the increased pressure and the rising liquid level will drive the buoyant tank to push the sealing cap upwards, so that the sealing cap is away from the base of the outer frame, so that the annular air groove is opened , So that the pressure can be released by the annular air groove, and the air flow is driven to facilitate liquid injection. When the storage liquid is pumped out, the suction force generated by the lowered liquid level and the reduced pressure will drive the buoyancy box downward, so that the buoyancy box opens the sealing cover downwards, allowing the opening to communicate with the internal space without being closed. At this time, air can enter the internal space through the opening, and air flow is generated to make the pumping fluid smooth. In addition, between the outer frame base, the vent box, and the buoyancy box, non-rolling sliding contact is generated through the sliding members, thereby reducing mutual friction between each other, because the sliding members are tubular (or strips) Shape), so the sliding contact is generated on the arc-shaped outer peripheral surface, which can reduce the friction area, improve the sliding smoothness and prevent the outer frame base, the vent box or the floating box from being stuck.

Referring to FIGS. 3, 4 and 5, an embodiment of the vent valve 5 of the inner floating roof 4 of the present invention is suitable for being disposed on an inner floating roof 4. The vent valve 5 includes an outer frame base 51 fixed on the inner floating roof 4, a vent hole box 52 surrounded by the outer frame base 51 and forming a plurality of air holes 521, and a vent hole box 52 fixed on the top of the vent hole box 52 A sealing cover 53 above and above the outer frame base 51, a floating box 54 below the sealing cover 53, a plurality of slides provided between the outer frame base 51, the vent box 52 and the floating box 54 A piece 55, and a plurality of guide pieces 56 provided between the outer frame base 51, the vent box 52, and the float box 54. The vent hole box 52 defines an internal space 522 communicating with the vent holes 521. And the vent hole box 52 cooperates with the outer frame base 51 to define an annular air slot 57 located between the two in the horizontal direction. The sealing cover 53 has an opening 531 in the center.

The sliding members 55 have a tubular shape and the axis line extends in the horizontal direction, and are disposed in the annular air groove 57 and the internal space 522. The slider 55 located in the annular air groove 57 is fixed to the outer frame base 51 and is in sliding contact with the vent hole box 52 through the arc-shaped outer peripheral surface. The slider 55 located in the internal space 522 is fixed to the float box 54 and is in sliding contact with the vent box 52 through the arc-shaped outer peripheral surface. In this embodiment, the sliding members 55 are made of non-metallic materials, have acid resistance and alkali resistance, can correspond to volatile organic liquids, and have a low friction coefficient and have a good sliding effect.

The guides 56 have a tubular shape and the axis line extends in the height direction, and are disposed in the annular air groove 57 and the internal space 522. The guide 56 located in the annular air groove 57 is fixed to the outside of the vent hole box 52 and is in sliding contact with the outer frame base 51 through the arc-shaped outer peripheral surface. The guide 56 located in the internal space 522 is fixed to the inside of the vent box 52, and is in sliding contact with the float box 54 through the arc-shaped outer peripheral surface. In this embodiment, the guides 56 are also made of non-metallic materials, have acid and alkali resistance, can correspond to volatile organic liquids, and have a low friction coefficient and a good sliding effect.

In this embodiment, when the liquid storage is stable, as shown in FIGS. 4 and 5, the sealing cover 53 is pressed down against the outer frame base 51, thereby closing the annular air groove 57, and the buoy 54 is Due to the influence of buoyancy, the sealing cover 53 is pushed upwards to close the opening 531. At this time, the vent valve 5 is in a closed state to prevent the vaporized storage liquid from volatilizing and escaping. Due to the influence of buoyancy, it tends to rise to the same height as the inner floating roof 4, but due to the weight of the sealing cover 53 canceling out part of the buoyancy, the balance state of FIG. 4 finally appears.

Referring to FIGS. 6 and 7, when the storage liquid is injected from the outside, the rising liquid level and the increased pressure drive the buoyant tank 54 to continue to move upward, which will cause the sealing cover 53 to be driven by the buoyant tank 54 away from the upward The outer frame base 51, so that the annular air groove 57 is no longer closed, so that the pressure can be released by the annular air groove 57 to reduce the shaking of the inner floating roof 4 to maintain stability, and to drive air flow to make the liquid injection Smooth.

Referring to FIG. 8 and FIG. 9, when the storage liquid is drawn to the outside, the falling liquid level and the suction force caused by the reduction in pressure will drive the buoy 54 to move downward, thereby no longer closing the opening 531, so that the air can be The opening 531 enters through the internal space 522, and enters the inner floating roof 4 after passing through the air holes 521 and the annular air groove 57. The aforementioned air flow can make the pumping operation smooth. Through the aforementioned actuation method, this embodiment can be opened by being driven by the buoyancy of the liquid storage, so as to achieve the function of adjusting the air pressure, and can avoid the disadvantages of the conventional driving by impact method. It should be noted that when the inner floating roof 4 is stopped at the lowest use state or maintenance height, since there is no liquid pressure between the floating plates 41, the floating tank 54 will naturally Next, the state shown in FIG. 9 is presented.

Referring back to FIGS. 4 and 5, the sliding members 55 and the guiding members 56 are in sliding contact with the outer frame base 51, the vent box 52, and the buoyancy box 54 through the arc-shaped outer peripheral surface, not only Significantly reduce the friction area and increase the smoothness of sliding, and because it is made of non-metallic materials, it can avoid dangerous situations such as high temperatures and sparks caused by friction between metals. In addition, since the sliding members 55 and the guide members 56 are fixed in a manner that does not roll or rotate, there is no need to worry about the smoothness of rotation or rolling during installation and maintenance, and it is quite easy to install and disassemble , Effectively improve convenience. The arrangement of the sliding members 55 and the guiding members 56 also enables the present embodiment to adopt the three-layer design of the outer frame base 51, the vent box 52, and the buoy 54, with a simple structure and components Few.

It should be particularly noted that although in this embodiment, two guides 56 are arranged on both sides of each slider 55, in practice, the sliders 55 and the guides 56 may need to be changed The arrangement of the sliders 55 and the guides 56 can also be replaced (for example, the slider 55 provided on the base 51 of the outer frame is fixed to the vent box 52), and further In this embodiment, only the sliding member 55 or the guiding member 56 may be provided, and the number and distribution position may be changed according to the balance condition, and it is not limited to this. In addition, the buoyancy tank 54 with different weights can also be selected according to the type of liquid storage and the required air permeability to adjust the buoyancy of the buoyancy tank 54 to change its stroke (for example, to change the opening of the opening 531), and thereby Produce suitable pressure relief ventilation function.

In summary, the new model is in a closed state in the general state to avoid the volatilization of the storage liquid, and it is in the open state when drawing and injecting liquid to achieve the effect of air circulation and pressure relief. The way is better than the old one-way ventilation valve. The sliding member 55 and the guide member 56 can reduce the friction area and improve the smoothness of sliding, avoiding the danger and wear caused by frictional contact on the whole surface of the metal, and installation and disassembly Easy, so it can really achieve the purpose of new cost.

However, the above are only examples of the new model. When the scope of the new model cannot be limited by this, any simple equivalent changes and modifications made according to the patent application scope and patent specification content of the new model are still regarded as Within the scope of this new patent.

4: Inner floating roof 5: vent valve 51: outer frame base 52: vent box 521: Stomata 522: interior space 53: Sealing cover 531: opening 54: floating box 55: Slider 56: Guide 57: annular air groove

Other features and functions of the present invention will be clearly presented in the embodiments referring to the drawings, in which: Figure 1 is a schematic diagram illustrating a conventional vent valve; 2 is a schematic diagram illustrating the open state of the vent valve in FIG. 1; Figure 3 is a perspective view illustrating the inner floating roof to which the new model is applicable; 4 is a side cross-sectional view illustrating an embodiment of the two-way vent valve of the new internal floating roof; 5 is a perspective view illustrating the three-dimensional appearance of FIG. 4; 6 is a side cross-sectional view illustrating the open state of this embodiment when injecting liquid; 7 is a perspective view illustrating the three-dimensional appearance of FIG. 6; 8 is a side cross-sectional view illustrating the open state of the present embodiment when pumping liquid; and FIG. 9 is a perspective view illustrating the three-dimensional aspect of FIG. 8.

4: Inner floating roof

5: vent valve

51: outer frame base

52: vent box

521: Stomata

522: interior space

53: Sealing cover

531: opening

54: floating box

55: Slider

56: Guide

57: annular air groove

Claims (7)

A bidirectional vent valve with an internal floating roof, the vent valve including: An outer frame base, fixed on the inner floating roof; A vent box surrounded by the outer frame base and forming a plurality of vent holes, the vent hole box defines an internal space communicating with the vent holes, and cooperates with the outer frame base to define an annular air slot; A sealing cover is fixed on the top surface of the vent box and is located above the outer frame base and forms an opening. When the sealing cover is pressed against the outer frame base, the sealing cover closes the annular air groove, and the The air hole communicates with the annular air groove, and when the sealing cover moves upward away from the base of the outer frame, the annular air groove is opened; A floating box is located in the internal space and under the sealing cover. When the floating box abuts the sealing cover, the floating box closes the opening so that the opening does not communicate with the internal space. When moving away from the sealing cover downward, the internal space communicates with the opening; and A plurality of sliding members are arranged in the annular air groove and the internal space in a strip shape, and the sliding member located in the annular air groove is in sliding contact with one of the outer frame base and the vent hole box, located in the interior The sliding member in the space is in sliding contact with one of the vent box and the floating box. The bidirectional vent valve of the inner floating roof according to claim 1, wherein the sliding member located in the annular air groove is fixed to the base of the outer frame and is in sliding contact with the vent hole box. The two-way vent valve of the inner floating roof according to claim 2, wherein the sliding member located in the internal space is fixed to the floating tank and is in sliding contact with the vent hole box. The two-way vent valve of the inner floating roof according to claim 3, wherein the axial lines of the sliding members extend in the horizontal direction. The bidirectional vent valve of the inner floating roof as described in claim 4, further comprising a plurality of guides provided in the annular air groove and the internal space, and the axis lines of the guides extend along the height direction and are located in the ring The guide in the air slot is in sliding contact with one of the outer frame base and the vent box, and the guide in the inner space is in sliding contact with one of the vent box and the buoyancy box. The bidirectional vent valve of the inner floating roof according to claim 5, wherein the guide member located in the annular air groove is fixed to the vent hole box and is in sliding contact with the base of the outer frame. The two-way vent valve of the inner floating roof according to claim 6, wherein the guide located in the internal space is fixed to the vent hole box and is in sliding contact with the floating box.

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