KR20210030934A - Relief valve - Google Patents

Abstract

In order to provide an explosion-proof valve 1 which can be manufactured simply and inexpensively and in particular reduces deposits on the valve seat, the first end surface DA1 forming the first sealing surface DF1 according to the invention And a second end surface DA2 facing each other forming the second sealing surface DF2 is provided on the sealing member 16, and the valve plate 15 is the first end when the explosion-proof valve 1 is closed. Sealing contact with the sub surface DA1, the second end surface DA2 is at least partially exposed, the inner continuous sealing inner circumferential surface 23 is provided on the sealing member 16, and The sealing inner circumferential surface connects the first end surface DA1 and the second end surface DA2 to be directly sealed with the wall or the fixing flange arranged on the wall in the state where the explosion-proof valve is installed in the closed state, and the sealing inner circumferential surface 23 The outer sealing outer circumferential surface 28 of the sealing member 16 facing the first end surface DA1 and connecting the second end surface DA2 is disposed on the valve seat member 5, and the sealing inner circumferential surface 23 ) Limits the valve seat opening VO along the perimeter.

Description

Relief valve

The present invention relates to a relief valve in the form of an explosion-proof valve for arranging at a wall opening of a wall of a work space for reducing the pressure of the working space when the combustion medium explodes when a predetermined opening pressure inside the working space is exceeded, the valve A valve seat member having a seat opening, a valve plate that closes the valve seat opening in the closed state of the relief valve, and a valve plate disposed between the valve seat member and the valve plate on the valve seat member and in contact with the valve plate in the closed state of the explosion-proof valve And an integral sealing member, wherein the valve plate can be lifted from the sealing member for opening of the valve seat opening when a predetermined opening pressure is exceeded.

Relief valves are, for example, explosion-proof valves used to relieve pressure in closed working spaces in case of explosion. Such a working space can be, for example, a crank housing of an internal combustion engine, which, in particular in order to prevent damage, has to relieve the pressure that suddenly rises inside the crank housing due to the explosion in case of an explosion. There are also other closed workspaces that must be protected in case of explosion using relief valves. Closed working spaces, where powdered flammable media are handled, are particularly at risk of explosion, since dust explosions can take place relatively easily here. If the dust consists of a combustible material, for example coal, flour, wood, cacao, coffee, starch or cellulose, the mixture of dust and air is explosive. Inorganic substances and elements such as for example magnesium, aluminum and even iron and steel are explosive (or at least flammable) in this form. In addition to combustibility, the small particle size of the dust is also decisive, that is, as the particle size decreases, the surface of the dust particle increases, thereby increasing the explosion effect. Due to this effect, even materials that are considered non-flammable in a compact form can be burned in this finely dispersed form. As an ignition source, various electrical or mechanical effects due to sufficient temperature and energy density can be used. Sparks caused by, for example, unplugging an electrical plug or malfunctioning inside an electrical device may suffice. For example, not only static electricity caused by electrostatically charged clothing, but also conveying means (conveyor belts made of rubber or the like) that can generate significant electrostatic stresses and charges by friction and movement are also important sources of risk. Other sources of ignition are, for example, hot surfaces (eg in a production environment), grinding- or friction sparks and bearing damage.

Explosion-relief valves are basically disclosed in the prior art. For example, documents DK 91047 C, KR 101800799 B1, CN 204512564 U, DE 212012000084 U1, AT 6424 U1, AT 311129 B, ES 312337 A3, KR 100928079 B1 , KR 100981453 B1, WO 09136674 A1, and DD87441 A present various shapes of explosion-proof valves, and in this case, ring-shaped grooves and O-rings are formed on the valve seat for sealing between the valve plate and the valve seat. A seal is provided. The relatively high manufacturing complexity of the valve seat, on the one hand, is a disadvantage of this shape, on the one hand, since in order to ensure a good sealing, in particular the groove for the O-ring must be manufactured very accurately. Another disadvantage is that expensive corrosion-resistant materials have to be used for the valve seat due to the contact of the valve seat with the working space, especially when the medium inside the working space is aggressive, which is expensive. In addition, a gap is formed in the area of the seal in the valve seat, and deposits may form in the gap, which is not desirable for sensitive hygiene applications such as in the food- or pharmaceutical industry. Further, the desired sealing force cannot always be achieved, and replacement of the sealing portion for maintenance is relatively complicated. Document CN 206233978 U shows an explosion-proof valve having a flat seal between the valve seat and the valve disc and with a connecting pipe for attachment and a fixing flange. Besides explosion-proof valves, a number of other valves exist in the prior art, for example for regulating the flow of liquid or gaseous media. For example, documents JP S51100328 U and JP S63126677 U disclose spring-actuated valves. Documents US 2015/0377107 A1, JP S61206171 U and JP S 50100133 U show examples of positive control valves via actuators. In addition, there is a valve integrally configured with a device, for example a ship engine or distribution device, as shown in document 6,834,624 B1, document 4,674,449 A or document GB 473,901 A.

It is an object of the present invention to provide an explosion-proof valve that eliminates these drawbacks. In particular, explosion-proof valves should be able to be manufactured simply and inexpensively, and deposits on the valve seat should be reduced, and in particular should be prevented.

According to the present invention, the above object is provided in the sealing member with a first end surface forming a first sealing surface and a second end surface facing each other forming a second sealing surface, and in the closed state of the explosion-proof valve, the valve plate is Sealing contact with the first end surface, the second end surface at least partially exposed, and an inner continuous sealing inner circumferential surface provided to the sealing member so as to directly seal with the wall or the fixing flange arranged on the wall with the explosion-proof valve installed. Wherein the sealing inner circumferential surface connects the first end surface and the second end surface, faces the sealing inner circumferential surface, and connects the first end surface and the second end surface, the outer sealing outer circumferential surface of the sealing member is disposed on the valve seat member And the sealing inner circumferential surface is solved by limiting the valve seat opening along the periphery. By using the sealing member to shield the valve seat from the process medium inside the working space, a cheaper material can be used for the manufacture of the valve seat element. In addition, the demand for manufacturing precision, in particular flatness, of the valve seat member is less stringent, and this allows the valve seat to be manufactured cheaper. The valve seat member can be structurally implemented more simply, thereby enabling weight reduction. Further, the sealing member can be used for sealing against the fixed flange or against the wall at the same time, whereby a separate sealing can be omitted.

Preferably, the explosion-proof valve has a fixing means for fixing the explosion-proof valve to the wall of the working space, and as fixing means, preferably, a plurality of fixing screws are provided for screwing the explosion-proof valve to the wall of the working space. do. The screw is an inexpensive standard product and has the advantage that it can be simply opened and screwed back.

Preferably, a flame arrester for preventing flame propagation from the work space to the outside through the explosion prevention valve is provided in the explosion prevention valve, in which case the flame arrester is preferably a lamellar stack consisting of a plurality of laminated thin plate lamellas. It is implemented in the form of. Therefore, it is possible to reliably prevent the flame from spreading to the outside during an explosion inside the work space, which increases safety for people and reduces the risk of fire.

Preferably the explosion-proof valve has a suspension unit provided to apply a pre-stress to the sealing member on the valve plate by a pre-stress in the closed state of the explosion-proof valve, wherein the suspension unit is preferably linear, gradual or haptic. It is formed as a helical spring with a spring characteristic curve. This allows simple and inexpensive standard-mechanical elements to be used.

Preferably, a circular valve seat opening and a corresponding circular valve plate are provided, in which case the sealing member is formed as a rotationally symmetric sealing ring. This results in a substantially cylindrical explosion-proof valve that can be manufactured simply and inexpensively. By means of the circular shape of the opening, the valve plate and in particular the sealing ring, a good sealing action is achieved and deposits are reduced.

It is preferable that the first end surface and the sealing inner circumferential surface form a first main sealing lip that contacts the valve plate in the closed state of the explosion-proof valve. Further, it is preferable that the first end surface and the sealing outer circumferential surface form a second main sealing lip that contacts the valve plate in the closed state of the explosion-proof valve. This can improve the sealing action.

In order to further improve the sealing action, at least one auxiliary sealing lip may be provided on the first end surface of the sealing member, the auxiliary sealing lip being arranged between the first main sealing lip and the second sealing lip or At least one auxiliary sealing lip is provided on the second end surface and the auxiliary sealing lip is arranged between an outer circumferential surface of the sealing portion and an inner circumferential surface of the sealing portion.

Preferably, a valve seat member protrusion extending inwardly in the direction of the valve seat opening is provided in the valve seat member, and a sealing member recess for disposing the sealing member in the valve seat member protrusion is provided on the sealing outer circumferential surface, in this case the valve The seat member has a first disc-shaped valve seat part having a first central valve seat part recess and a second central valve seat part recess according to a preferred shape, and a second disc-shaped adjacent thereto in the direction of closing movement of the valve plate. It comprises a valve seat component, in which case the first valve seat component recess is smaller than the second valve seat component recess, for the formation of the valve seat component protrusion. Due to this, the manufacture of the valve seat member and consequently the manufacture of the entire explosion-proof valve can be simplified, and good arrangement and simple assembly of the sealing member can be achieved.

Continuing with reference to Figs. 1A to 4B, which illustrate, illustratively, schematically and non-limitingly, preferred features of the invention, the invention will be described in detail.

1A is a view showing an explosion-proof valve disclosed in the prior art.
1B is a view showing a detailed view of the valve seat.
Figure 2a shows an explosion-proof valve according to the invention in a closed state.
Figure 2b is a view showing a detailed view of the valve seat of the explosion-proof valve according to the present invention.
3 is a view showing an explosion-proof valve according to the present invention in an open state.
4A is a view showing a first shape of the sealing member of the explosion-proof valve according to the present invention.
4B is a view showing another shape of the sealing member of the explosion-proof valve according to the present invention.

1 is a cross-sectional view of a cylindrical explosion-proof valve 1 disclosed in the prior art. The explosion-proof valve 1 is closed so that the explosion-proof valve 1 seals the working space AR against the periphery AT of the closed working space AR in the closed state of the explosion-proof valve 1. It is arranged in the wall opening 4 of the wall 3 of the working space AR. The explosion-proof valve 1 here comprises a valve shaft VA, an outer valve housing 2 and a valve seat member 5 supported together by a plurality of clamping members 6 in the form of a clamping screw 6a. do. Spacing members 7 are arranged between the valve housing 2 and the valve seat member 5, and as shown in Fig. 1, the spacing members are, for example (not shown), clamping screws ( It can be implemented around 6a) or integrally with the clamping screw 6a. The spacing members 7 are used for substantially fixed connection between the valve housing 2 and the valve seat member 5 at a specific spacing in the axial direction of the explosion-proof valve 1 at a distance from each other. A corresponding threaded bore 8 can be provided in the valve seat member 5 to tighten the clamping screw 6a, and a screw nut 9 for secure screwing of the clamping screw 6a to the valve housing 2 Is provided, and the screw nut is screwed into the threaded section of the clamping screw 6a protruding past the valve housing 2.

A flame arrester 10 is disposed between the valve housing 2 and the valve seat member 5 in the axial direction and in the radial direction outside the explosion-proof valve 1, and the flame arrester is in the form of a laminated sheet of lamellar therein. Is implemented as The flame arrester 10 is used to prevent flames from spreading to the surroundings (AT) through the explosion prevention valve 1 in the open state of the explosion prevention valve 1 in the case of an explosion inside the work space AR. do. The explosion-proof valve 1 is here fixed to the wall 3 by means of fastening means 11 in the form of a fastening screw 11a. For screwing of the fixing screw 11a, a corresponding threaded bore 12 is provided in the wall 3. In addition, a spacer 7 between the valve housing 2 and the valve seat member 5 may be arranged around the fixing means 11, the spacer being implemented as a spacer sleeve 7a in the example shown. do.

A suspension unit 13 is disposed on the inner side of the valve housing 2, and one axial end of the suspension unit contacts the valve housing 2, and the opposite axial end contacts the valve plate 15. do. The suspension unit 13 applies a pre-stress to the valve seat member 5 on the valve plate 15 by a prescribed pre-stress in the closed state of the explosion-proof valve 1, so that the wall opening of the wall 3 ( 4) And work space (AR) can be closed. On the valve seat member 5, a sealing member 16 in the form of an O-ring is disposed between the valve plate 15 and the valve seat member 5, and the sealing member is (closed of the explosion prevention valve 1). State) the valve plate 15 is sealed against the valve seat member 5.

Fig. 1b is a detailed view of the sealing area between the valve plate 15 and the valve seat member 5, indicated in Fig. 1a. The sealing member 16 embodied here as an O-ring is arranged in a substantially annular enclosing sealing groove 17 in the valve seat member 5. In order to achieve a sufficiently good sealing action, the shape of the sealing groove 17 is very important. The sealing groove 17 has a complex geometry, ie it must be manufactured very accurately with small dimensional tolerances and must also be very smooth, ie it must have a small roughness and must be flat. This, of course, requires a high manufacturing complexity, since the valve seat member 5 has to be machined to be mechanically complex, for example, the surface of the valve seat member 5 facing the valve plate 15 first, This is because the sealing groove 17 must be produced after it is formed, for example by milling or lathe processing, which can be made, for example, by lathe processing, if the sealing groove is a rotationally symmetric sealing groove as here.

In the conventional implementation of the explosion-proof valve, the manufacture of the valve plate, which is generally carried out by deep drawing processing, is also relatively complicated in order to achieve a sufficient sealing force. In particular, very high accuracy is required for the flatness of the valve plate, which cannot always be sufficiently satisfied.

In addition to the relatively high manufacturing technical complexity for the production of the sealing groove, the valve plate 15 and the valve seat in the area of the sealing member 16 in the closed state of the explosion-proof valve 1, as shown in FIG. A gap region 18 between the members 5 is formed. Such a gap area is particularly undesirable when some very stringent legal requirements with respect to cleanliness apply, for example in the case where explosion-proof valves 1 are used in hygienic applications in the food- or pharmaceutical industry. If, for example, perishable food is handled in the working area AR, there is a risk of deposits forming in the gap area 18, which may lead to the formation of bacteria, which is undesirable in any case. .

It can also be seen from Fig. 1A that the valve seat member 5 is in direct contact with the working space AR and the working medium handled therein on the radially inner side. When using the explosion-proof valve 1 when the medium inside the working space AR is aggressive and highly corrosive, the valve seat 5 must be suitably made of corrosion-resistant and thus expensive material, which is from an economical point of view. Not desirable.

Thus, according to the present invention, as shown in Figs. 2A, 2B and 3, an explosion-proof valve 1 having a specially formed sealing member 16 is implemented. A first end surface DA1 forming the first sealing surface DF1 and a second end surface DA2 facing each other forming the second sealing surface DF2 are provided on the sealing member 16, and in this case, an explosion In the closed state of the prevention valve 1, the valve plate 15 is in sealing contact with the first end surface DA1 or the formed sealing surface DF1, and the second end surface DA2 is at least partially exposed. That is, the explosion-proof valve 1 may be arranged such that the exposed end surface DA2 contacts the part, for example, the wall 3 of the work space AR when in use. The sealing member 16 also has an inner continuous sealing inner circumferential surface 23, which connects the first end surface DA1 and the second end surface DA2. A sealing outer circumferential surface 28 of the sealing member 16 facing the sealing inner circumferential surface 23 and connecting the first end surface DA1 and the second end surface DA2 is disposed on the valve seat member 5. By the shape according to the present invention, the sealing member 16 is also used for sealing to the valve plate 15 and for direct sealing to the fixing flange 20 or to the wall 3, whereby a separate seal is omitted. Can be (see Figs. 1A and 1B, the seal between the valve seat member 5 and the wall 3).

Fig. 2a shows a cross-sectional view of an explosion-proof valve 1 according to the invention, which is arranged in the wall opening 4 of the wall 3 of the working space AR and has a valve axis VA. The configuration of the explosion-proof valve 1 basically corresponds to the configuration of the explosion-proof valve 1 shown in Fig. 1A. The explosion-proof valve 1 has a valve housing 2, which is fixed to the wall 3 by means of a fixing means 11, here by means of a fixing screw 11a (not shown in cross section), The fixing screw is screwed into a threaded bore 12 (not shown) in the wall 3. In order to support the explosion-proof valve 1 together in the axial direction, the explosion-proof valve 1 has a clamping member 6 distributed circumferentially, a clamping screw 6a in the example shown. A support member 19 may also be provided at an end lying on the outside of the clamping member 6, away from the valve housing 2, the support members being embodied in the form of screw eyelets here, the screw eyelets being for example For example, it is screwed into the threaded section of the clamping screw 6a. By fixing the relief valve to the crane hook, for example, the explosion-proof valve 1 can be handled more simply by means of the supporting members 19 or screw eyelets, which is especially useful in the implementation of the heavy explosion-proof valve 1. This is preferable because it simplifies assembly.

The explosion-proof valve 1 also comprises a suspension unit 13 which is formed here as a conical helical spring 14, preferably having a nonlinear spring characteristic curve. The nonlinear spring characteristic curve means that the spring stiffness (c) of the helical spring 14 changes according to the distance (l) as long as the helical spring 14 is compressed. It corresponds to the so-called valve stroke (H _x ) of the explosion-proof valve (1). The valve stroke H _x is thus the distance between the closed position and the open position of the valve plate 15. The nonlinear spring characteristic curve can be implemented gradually or tangibly, in which case the spring constant (c) increases over the distance (l) in the gradual spring characteristic curve, and decreases over the distance (l) in the tangible spring characteristic curve do. This, for example, requires a specific first opening force (Fo1) to lift the valve plate 15 by the first 10% of the _{valve stroke (H x ), and the valve plate with the second 20% of the valve stroke (H).} A specific second opening force Fo2 is required in order to additionally lift (15), and the second opening force may mean greater (gradually) or less (perceptual) than the first opening force Fo1. . Accordingly, the opening characteristic of the explosion-proof valve 1 may be determined by the structural shape of the helical spring 14. Of course, a helical spring 14 having a linear spring characteristic curve can also be used, in which case the spring constant c is constant over the distance l.

Of course, other types of springs, such as ring springs, volute springs, diaphragm springs, disc springs, etc., may be considered to be used as the suspension unit 13. Further, for example, a disclosed air spring can be used, which will provide the advantage that the spring stiffness c and the opening characteristics of the explosion-proof valve 1 can be changed by the air pressure of the air spring. This allows the relief spring 1 to be adjusted very flexibly for various applications with variable opening pressure, in which case the opening pressure is the working space where the valve plate 15 starts to lift from the valve seat member 5 (AR) Corresponds to the internal pressure.

The valve plate 15 is disposed so as to contact sealing member 16 in the closed state of the explosion-proof valve 1 and to be movable relative to the sealing member 16 in the direction of the valve axis VA. The valve plate 15 closes the valve seat opening VO of the explosion-proof valve 1 in the closed state, and the sealing member 16 by the pressure applied by the valve plate 15 to the valve plate 15 in general. When lifted from, the valve seat opening VO is opened. The explosion-proof valve 1 comprises a special sealing member 16 according to the invention and a valve seat member 5 acting therewith. The sealing member 16 has a first sealing surface DF1 on the first end surface DA1, and the sealing surface is the valve plate inner surface 15a of the valve plate 15 in the closed state of the explosion-proof valve 1. ) In sealed contact. The second end surface DA2 of the sealing member 16, which faces in the direction of the valve shaft VA, has an exposed second sealing surface DF2. The first end surface DA1 and the second end surface DA2 are connected by a continuous sealing inner circumferential surface 23 on the inner side (toward the valve seat opening VO), and the sealing outer circumferential surface 28 on the opposite side. ), in which case the sealing inner circumferential surface 23 simultaneously forms a limiting portion along the periphery of the valve seat opening VO. The sealing member 16 and in particular the sealing inner circumferential surface 23 are formed as a continuous surface forming a restriction along the periphery of the valve seat opening VO, so that possible seams in the area of the valve seat opening VO can be minimized as much as possible and In this way, the risk of deposits on the explosion-proof valve 1 can be reduced and preferably prevented. The continuous sealing inner circumferential surface 23 is used in particular to allow undesirable components such as dust or oil to be discharged from the sealing member 16. This is particularly advantageous in hygienic applications in order to prevent undesirable components from being left on the sealing member 16 during the cleaning process of the explosion-proof valve 1. At the same time, by this implementation of the sealing member 16, it is ensured that the valve seat member 5 is separated from the valve seat opening VO by the sealing member 16. Thereby, the valve seat member 5 is no longer in contact with the working medium inside the working space AR, so that the valve seat member 5 can be implemented more simply with respect to the materials used.

The exposed second end surface DA2 allows the explosion-proof valve 1 to be simply and reliably sealed to the component. It may be desirable for the second end surface DA2 to protrude from the axial end of the explosion-proof valve 1, formed from the valve seat member 5, in the direction of the valve shaft VA, thereby sealing The member 16 can be compressed axially by the fixing means 11 when placed on the part, which improves the sealing at the second sealing surface DF2.

The explosion-proof valve 1 can for example be fixed directly to the wall 3 of the working space AR. In addition, a fixed flange 20 may also be provided, the fixed flange being fixed to the wall 3 and the explosion-proof valve 1 fixed to the fixed flange. For this purpose, the explosion-proof valve 1 may be first connected to the fixing flange 20 and then connected together to the wall 3.

The clamping screw 6a is screwed into the fixing flange 20 in the embodiment shown, in this case, of course, a corresponding recess axially penetrating the valve seat member 5 in the valve seat member 5, preferably A through bore is provided, and the clamping screw 6a can be screwed to the fixing flange 20 (or also to the wall 3) by passing through the through bore. However, the fixed flange 20 is only optional, and in particular, an accurately defined sealing surface 21 can be provided as a support for the sealing member 16, thereby improving the sealing properties of the explosion-proof valve 1 Provides. In particular, when the surface of the wall 3 is contaminated or uneven, the arrangement of the fixing flange 20 is preferable. Further, since the recess in the fixing flange 20 can be more simply adjusted with respect to the valve seat opening VO, a seam or gap is not formed between the fixing flange 20 and the sealing member 16 as much as possible. Accordingly, the central recess 20a in the fixing flange 20 can simply extend axially in a straight line with respect to the valve seat opening VO and seamlessly. If the fixing flange 20 is not provided, the sealing member 16 is a wall of the working space AR instead of the fixing flange 20 by the exposed second sealing surface DF2 of the second end surface DA2. 3) directly support.

The explosion-proof valve 1 is implemented in the embodiment shown comprising a substantially cylindrical, round, preferably circular valve seat opening VO, in which case the wall opening 4 of the wall 3 is of course preferred. It also has a round cross section. Thus, the valve plate 15, the valve seat member 5 and the fixing flange 20 are implemented substantially rotationally symmetrically about the valve axis VA in the illustrated example. The sealing member 16 is thus also implemented as a rotationally symmetric sealing ring. Of course, the bores for the clamping screw 6a and the fixing screw 11a can be excluded from rotational symmetry. The bores are arranged over so-called bolt holes having a specific bolt hole diameter, and are preferably arranged spaced apart from each other at regular angular intervals in the bolt hole.

The sealing member 16 is preferably a sealing inner circumferential surface 23 having an outer surface 22 of the recess 20a of the fixing flange 20, which may be conical or cylindrical, is continuous and smooth of the valve seat opening VO. It is implemented to form a limiting surface along the perimeter, preferably as seamless as possible.

The valve seat member 5 can be implemented integrally, or can be implemented in two parts as in the illustrated embodiment. Since the valve seat member 5 is implemented in two parts, the valve seat member 5 can be manufactured very simply and inexpensively, because the two valve seat parts 5a, 5b are substantially structurally simple. This is because it is a disk-shaped part. The manufacture of the valve seat parts 5a, 5b can thereby be made simply, for example by laser cutting from a plate of a suitable material, by continuous casting and subsequent sawing or the like. Of course, the valve seat member 5 may be implemented integrally as, for example, a lathe processing unit.

In the illustrated example, the valve seat member 5 comprises two valve seat parts 5a, 5b adjacent to each other in the direction of the valve axis VA of the explosion-proof valve 1. As shown in Fig. 2B, the first valve seat part 5a is located closer to the valve plate 5 in the axial direction than the second valve seat part 5b. The first valve seat component 5a has a first central valve seat component recess, and the second valve seat component 5b has a second central valve seat component recess. The first valve seat component recess has a smaller diameter than the second valve seat component recess, ie in the case of the illustrated cylindrical implementation of the explosion-proof valve 1 compared to the second valve seat component recess. The two valve seat parts 5a, 5b arranged up and down are thus embodied in a substantially disc shape with the same outer diameter, but with different thicknesses and different inner diameters. This shape forms, for example, a substantially ring-shaped valve member protrusion 24 extending radially inward. Of course, such a valve member protrusion 24 protruding from the valve seat member 5 in the direction of the valve seat opening VO may optionally be formed differently, in particular over the integral valve seat member 5. The valve member protrusion 24 is preferably implemented closed over the circumference of the valve seat opening VO.

The sealing member 16 preferably has its sealing outer circumferential surface 28 disposed on the valve member protrusion 24. To this end, the sealing member 16 has a sealing member recess 25 corresponding to the sealing outer peripheral surface 28, by means of which the sealing member 16 can be disposed on the valve member protrusion 24.

Another advantage of the explosion-proof valve 1 according to the invention is the complete shielding of the valve seat member 5 from the working medium of the explosion-proof valve 1. This allows the valve seat member 5 or the two valve seat parts 5a, 5b of the valve seat member 5 to be made of any suitable material, and in the prior art the mechanical Machinable materials required for machining do not necessarily have to be used. In particular when handling corrosive working medium in the working space AR, the shielding of the valve seat member 5 from the working medium provides a distinct advantage over conventional valves. By preventing the valve seat member 5 from coming into contact with the aggressive corrosive atmosphere inside the work space AR, it is not necessary to use a corrosion-resistant material for manufacturing the valve seat member 5 as before, for example, mild steel ( Simple steel such as S 235 JR) can be used, which can greatly reduce costs, especially when implementing large relief valves. Other suitable materials may also be considered, for example plastics or non-ferrous metals.

As described above, preferably a flame arrestor 10 is also provided in the explosion prevention valve 1, which prevents the flame from escaping from the explosion prevention valve 1 to the surrounding AT when a flame is generated due to explosion. It is used to This is particularly used as a safety measure for persons staying in the surroundings in some cases, or for fire protection when combustible materials, gases or other substances are present in the surrounding AT outside of the explosion-proof valve 1. Since this flame arrester 10 is disclosed in the prior art, it is not discussed in detail here.

In FIGS. 4A and 4B two preferred shapes of cross-sections of the sealing member 16 are shown by way of example. The specific structural shape of the sealing member 16 is of course entrusted to a person skilled in the art, depending on the application example of the explosion-proof valve 1, for example, depending on the temperature inside the working space AR, depending on the working medium or the working space ( AR) It may vary depending on internal pressure, etc. For example, the sealing member 16 surrounds one or more of the first end face DA1 facing the valve plate 15 and/or the second end face DA2 away from the valve plate 15. It may have a sealing lip (see FIGS. 4A and 4B). A cross-section of a first preferred shape of the sealing member 16 is shown in FIG. 4A, and a second preferred shape is shown in FIG. 4B. The sealing member 16 can be made of substantially any suitable material, in which case a conventional elastic material is preferably used. For example, plastics, synthetic rubbers, natural rubbers or other materials and mixtures thereof may be considered. Sealing materials are known in the prior art, and those skilled in the art can appropriately select a material suitable for a particular application. In particular, suitable sealing materials must be used for hygiene applications, for example in the food- or pharmaceutical industry.

The sealing member 16 of FIG. 4A has a sealing member recess 25 in the sealing outer circumferential surface 28, and the lower recessed surface 25a of the sealing member is a second sealing surface of the second end surface DA2 ( DF2) is substantially parallel. Since the facing upper recess surface 25b of the sealing member recess 25 is inclined at a specific prestress angle α with respect to the first recess surface 25a, (in the unmounted state of the sealing member 16) ) A specific minimum spacing a is provided between the two recessed faces 25a, 25b. This minimum distance a is preferably set so that the minimum distance is smaller than the axially protruding extension b of the valve seat member protrusion 24 (see Fig. 2B). Due to the preferred elastic material of the sealing member 16, a predetermined pre-stress can be formed, and the second recess surface 25b (in the mounted state of the sealing member 16) is formed by the pre-stress at the valve seat member protrusion ( 24) It is pressed upward. Due to this, a substantially gap-free arrangement of the sealing member 16 on the valve seat member protrusion 24 can be ensured, in which case the upper recess surface 25b is preferably the valve seat when the sealing member 16 is mounted. It lies flat on the member protrusion 24 and is thus parallel to the lower recess surface 25a.

The first (upper) end surface DA1 of the sealing member 16 is provided with first and second main sealing lips 27a, 27b, in which case the first main sealing lip 27a is the sealing inner circumferential surface 23 And the first sealing surface DF1, and the second main sealing lip 27b is formed by the first sealing surface DF1 and the sealing outer circumferential surface 28. The main sealing lips 27a and 27b each have round ends with a specific radius R. As shown in Fig. 2B, the main sealing lips 27a, 27b act to seal together with the valve plate 15 in the mounted state of the sealing member 16. As shown in FIG. The exact number (i) and exact structural shape of the main sealing lips (27i) depend on the application example of the explosion-proof valve (1), for example, the expected maximum or minimum temperature inside the working space (AR), It depends on the expected pressure, the working medium or the required life of the sealing member 16 for example. For example, in the closed state of the explosion-proof valve 1 (this is a general case), the first main sealing lip 27a contacting the inner surface 15a of the valve plate is as good as possible on the inner surface 15a of the valve plate. For close contact, it may be implemented with a long, narrow and small radius R, thereby minimizing the risk of deposits forming in the area between the valve plate 15 and the first main sealing lip 27a. Further, the main sealing lips 27a and 27b may be omitted, and in this case, the first sealing surface DF1 will be formed substantially similar to the second sealing surface of FIG. 4A. However, for example, only the first (or second) main sealing lip 27a (or 27b) may be provided on the sealing member 16.

As shown by the dotted line in Fig. 4A, for example, the sealing inner circumferential surface 23 may have a curvature in the unmounted state of the sealing member 16, thereby making it better for the valve plate inner surface 15a in the mounted state. It can be tight. In order to apply a predetermined pre-stress to the valve plate 15, the first main sealing lip 27a is preferably elastically deformed in the mounted state of the sealing member 16 and when the explosion-proof valve 1 is closed, This improves the sealing action. Due to the curvature of the sealing inner circumferential surface 23 of Fig. 2B, the entire sealing member 16 in the closed state of the explosion-proof valve 1 undergoes a predetermined deformation. This deformation may also depend on a number of parameters and influencing factors, for example the spring force pressing the valve plate 15 onto the sealing member 16, the sealing material, the temperature of the working space interior AR, and the like.

In the example shown in Fig. 4A, the sealing member 16 is a substantially straight sealing inner circumferential surface having a sealing slope β between the sealing inner circumferential surface 23 and the second sealing surface DF2 of the second end surface DA2. Has (23). For example, if the sealing inner circumferential surface 23 is bent and implemented (dotted line in FIG. 4A ), this sealing slope β may be variable over the length of the sealing inner circumferential surface 23. (Upper) In the first end surface DA1, two auxiliary sealing lips 29 are additionally arranged between the two main sealing lips 27a and 27b, and the sealing lips are closed of the explosion-proof valve 1 In the state, it contacts the inner surface 15a of the valve plate to improve sealing. The ends and edges of the auxiliary sealing lip 29 may also be provided with rounding with a specific radius R. Manufacturing may generally provide for a certain minimum radius of rounding. Further, depending on the application and the required sealing action, more or less auxiliary sealing lip 29 may be provided or no auxiliary sealing lip may be provided.

The embodiment according to Fig. 4b, unlike the embodiment according to Fig. 4a, in order to improve the sealing action on the fixing flange 20 (or the wall 3), the secondary sealing also on the (lower) second end surface DA2 It has a lip 29. In addition, a protrusion 30 is provided between the second main sealing lip 27b and the sealing member recess 25, whereby the recess face 25b is expanded so that the sealing member ( 16) provides improved support.

The shape of the sealing member 16 according to FIG. 4a is preferably used for a valve seat opening (VO) having a diameter <500 mm, and the shape of the sealing member 16 according to FIG. 4b is preferably a valve having a diameter> 500 mm. It is used for the sheet opening VO.

The illustrated variations of the sealing member 16 should, of course, be conceived only by way of example. A very great design freedom is given to the person skilled in the art with respect to the structural shape of the sealing member 16, and depending on the specific application of the explosion-proof valve 1, in order to achieve the required sealing action, a variety of sealing members 16 You can see that there are shapes. Of course, only the first or second main sealing lips 27a, 27b may be disposed, a plurality (i) of auxiliary sealing lips 29i may be disposed or different protrusions, curvatures and angles may be provided.

Although the explosion-proof valve 1 according to the present invention has been described with reference to a preferred cylindrical shape, it should be noted that basically other structural shapes are also possible. Explosion-proof valves 1 may also be provided for wall recesses 4 different from eg cylindrical shape, for example for triangular, square or elliptical wall recesses 4. The structural design can be matched to the shape of the wall recess 4. The essence of the present invention, namely the shape of the sealing member 16 for limiting the valve seat opening VO along the periphery and for shielding the valve seat member 5 from the valve seat opening VO, remains unchanged.

AR........work space,
3........wall,
4........wall opening,
1........Relief valve,
5........valve seat member,
15........valve plate,
16........no sealing.

Claims (10)

Arranged in the wall opening (4) of the wall (3) of the working space (AR) to relieve the pressure of the working space (AR) when the combustion medium explodes when the predetermined opening pressure inside the working space (AR) is exceeded. As an explosion-proof valve 1 for performing, the valve seat member 5, the valve seat opening VO, the valve plate 15, and on the valve seat member 5, the valve seat member 5 and the valve It is disposed between the plates 15 and includes a sealing member 16 in contact with the valve plate 15 when the explosion-proof valve 1 is closed, and the valve plate 15 is the explosion-proof valve 1 In the closed state of ), the valve seat opening VO is closed, and the valve plate 15 is lifted from the sealing member 16 to open the valve seat opening VO when a predetermined opening pressure is exceeded. In the detonated explosion-proof valve (1),
A first end surface DA1 forming a first sealing surface DF1 and a second end surface DA2 facing each other forming a second sealing surface DF2 are provided on the sealing member 16, and the explosion The valve plate 15 is in sealing contact with the first end surface DA1 so as to be directly sealed with the wall or the fixing flange arranged on the wall in the state where the explosion-proof valve is installed in the closed state of the prevention valve 1, and 2 End surface DA2 is at least partially exposed, an inner continuous sealing inner circumferential surface 23 is provided on the sealing member 16, and the sealing inner circumferential surface is the first end surface DA1 and the second end. The outer sealing outer circumferential surface of the sealing member 16 connecting the sub-surface DA2, facing the sealing inner circumferential surface 23 and connecting the first end surface DA1 and the second end surface DA2 ( 28) is disposed on the valve seat member (5), and the sealing inner circumferential surface (23) limits the valve seat opening (VO) along the periphery. 2. The anti-explosion valve (1) according to claim 1, having fixing means (11) for fixing the explosion-proof valve (1) to the wall (3) of the working space (AR), the fixing means ( Explosion, characterized in that a plurality of fixing screws (11a) are provided as 11), and the explosion prevention valve (1) can be screwed to the wall (3) of the working space (AR) by means of the fixing screws. Prevention valve. A flame arrestor (10) for preventing flame propagation from the working space (AR) to the outside through the explosion prevention valve (1) is provided in the explosion prevention valve (1), , The flame arrester 10 is an explosion prevention valve, characterized in that implemented in the form of a lamellar stack made of a plurality of laminated thin plate lamella. The method according to any one of claims 1 to 3, wherein the explosion-proof valve (1) has a suspension unit (13), and the suspension unit has a pre-stress (F) in the closed state of the explosion-proof valve (1). _V ) is provided to apply a pre-stress to the sealing member 16 on the valve plate 15, the suspension unit 13 being a helical spring 14 having a linear, gradual or haptic spring characteristic curve Explosion-proof valve, characterized in that formed as. The method according to any of the preceding claims, wherein a circular valve seat opening (VO) and a corresponding circular valve plate (15) are provided, the sealing member (16) being formed as a rotationally symmetric sealing ring. Explosion-proof valve characterized by. The method according to any one of claims 1 to 5, wherein the first end surface (DA1) and the sealing inner circumferential surface (23) form a first main sealing lip (27a), and the first main sealing lip is the An explosion-proof valve, characterized in that the explosion-proof valve (1) is in contact with the valve plate (15) in a closed state. The method according to any one of claims 1 to 6, wherein the first end surface (DA1) and the sealing outer circumferential surface (28) form a second main sealing lip (27b), and the second main sealing lip is the An explosion-proof valve, characterized in that the explosion-proof valve (1) is in contact with the valve plate (15) in a closed state. The method according to claim 7, wherein at least one auxiliary sealing lip (29) is provided on the first end surface (DA1) of the sealing member (16), the auxiliary sealing lip being the first main sealing lip and the second At least one auxiliary sealing lip 29 is provided on the feature arranged between the main sealing lip 27a, 27b and/or on the second end surface DA2 of the sealing member 16, the auxiliary sealing lip An explosion-proof valve having a feature arranged between the sealing outer circumferential surface (28) and the sealing inner circumferential surface (23). 9. The valve seat member according to any one of claims 1 to 8, wherein a valve seat member protrusion (24) extending inward in the direction of the valve seat opening (VO) is provided in the valve seat member (5), and the valve seat An explosion-proof valve, characterized in that a sealing member recess (25) for disposing the sealing member (16) in the member protrusion (24) is provided in the sealing outer peripheral surface (28). 10. The valve plate according to claim 9, wherein the valve seat member (5) has a first disc-shaped valve seat part (5a) having a central first valve seat part recess and a central second valve seat part recess, and the valve plate A second disc-shaped valve seat part (5b) adjacent thereto in the closing motion direction of (15), wherein the first valve seat part recess is provided for the formation of the valve seat member protrusion (24), Explosion-proof valve, characterized in that it is smaller than the valve seat component recess.

Images