Blast valve

Abstract

The invention relates to a blast valve (1) for a shelter comprising a valve body (10) forming a flow channel (100), a valve plate (11) provided inside the valve body (10) and extending across the flow channel (100), an annular air deflector (12) provided in the flow channel (100) and arranged to co-operate with the valve plate (11) for capturing pressure blasts acting upon the valve plate (11); and a valve axis (13) having a first axis end (13a) and a second axis end (13b), the valve axis (13) is arranged to extend along the flow channel (100). The valve plate (11) and the annular air deflector (12) are separately arranged on the valve axis (13) such that the valve plate (11) and the annular air deflector (12) are independently movable along the valve axis (13).

Description

[0001] BLAST VALVE

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to a blast valve for a shelter. The blast valve is an intake and exhaust valve which is arranged to prevent blast waves from entering to an internal space of the shelter or other protective area similar to shelter.

[0004] BACKGROUND OF THE INVENTION

[0005] In the prior art, the blast valve comprises a valve plate with a flow guide at the edge of the plate which is intended to capture the pressure flow while the valve plate closes the outlet of the valve, i.e., the air opening leading to the shelter. The flow guide extends from the surface of the valve plate towards the valve inlet, where the pressure flow comes from. The flow guide is moulded directly into the valve plate or welded firmly to the valve plate.

[0006] One of the problems associated with the prior art is that the valve plate with the flow guide extending from its surface is quite heavy in mass so that it will take time to close the air opening in a situation where every fraction of a second is important

[0007] BRIEF DESCRIPTION OF THE INVENTION

[0008] An object of the present invention is to provide a blast valve which alleviates the disadvantages of the prior art.

[0009] The objects of the invention are achieved by a blast valve which is characterized by what is stated in the independent claim. The preferred embodiments of the invention are disclosed in the dependent claims.

[0010] The invention is based on the idea of minimizing the weight of the valve plate so that the closing of the air opening leading to the shelter is faster in a situation where a pressure wave tries to reach the shelter through the valve.

[0011] A blast valve for a shelter according to the invention comprises a valve body forming a flow channel, the valve body has a first end and a second end, and the flow channel extends between the first end and the second end; a valve plate provided inside the valve body and extending across the flow channel, the valve plate has a plate surface; an annular air deflector provided in the flow channel and arranged to co-operate with the valve plate for capturing pressure blasts acting upon the valve plate; and a valve axis having a first axis end and a second axis end, the valve axis is arranged to extend along the flow channel, the valve plate and the annular air deflector are separately arranged on the valve axis such that the valve plate and the annular air deflector are independently movable along the valve axis.

[0012] The valve body is preferably tubular, but may also comprise truncated cone sections connected together. However, the valve body is also preferably rotationally symmetrical about its axis. The valve body extends between the first end and the second end which are open so that the flow channel is formed inside the valve body between the first end and the second end. The valve plate is arranged inside the valve body so that the plate surface is perpendicular to the axis of the valve body extending between the first end and the second end of the valve body, and the valve plate is thereby also transverse to the valve body. The annular air deflector is arranged to co-operate with the valve plate so that the annular air deflector provides a collar for the plate surface when the annular air deflector and the valve plate are in contact with each other. The annular air deflector and the valve plate are preferably sized such that the collar is formed on the edge of the valve plate, or on the circumference of the valve plate. By arranging the collar of the annular air deflector in such a way that when the annular air deflector is in contact with the valve plate, the collar is on the edge region of the valve plate, the pressure wave that erupts from the center of the plate towards the circumference can be captured most efficiently. The valve plate and the annular air deflector are arranged on the same valve axis but separately so that they are independently movable. The valve plate and the annular air deflector are both movable along the flow channel on the valve axis. The valve axis preferably extends along the axis of the valve body between the first end and the second end of the valve body. When the valve plate moves separately from the annular air deflector, the valve plate closes the flow opening through the blast valve to the shelter faster, and the annular air deflector can receive the pressure wave accompanying the blast without slowing down the movement of the valve plate towards the opening.

[0013] The annular air deflector being separate from the valve plate is advantageous in the event of pressure strokes or pressure blasts, because the annular air deflector lags behind the valve plate due to the valve plates larger surface area which causes a faster start-up for the valve plate. The annular air deflector captures the rapidly advancing pressure spike, so that it does not flow through the blast valve. The valve plate closes due to the impact of the pressure stroke.

[0014] According to the invention the annular air deflector comprises a center piece and a flow controller connected to the center piece. The center piece is arranged on the valve axis so that the annular air deflector moves, and the flow controller is arranged to extend around the center piece at a distance from the valve axis such that when in contact with the valve plate, the flow controller forms a collar on the valve plate which the collar extends away from the plate surface in a transverse direction to the plate surface.

[0015] In other words, the annular air deflector has the center piece which is provided on the valve axis so that the annular air deflector is movable along the valve axis. The flow controller of the annular air deflector comprises an annular surface which extends around the center piece. The annular surface of the flow controller forms a collar on the plate surface of the valve plate when the annular air deflector is in contact with the valve plate, which the collar extends preferably perpendicularly with respect to the plate surface. However, the flow controller may alternatively have an inclination with respect to the plate surface, either inwards towards the valve axis or outwards away from the valve axis.

[0016] According to the invention the flow controller is arranged coaxially with the valve axis.

[0017] In other words, the flow controller around the center piece of the annular air deflector is coaxial with the valve axis on which the annular air deflector is arranged to move.

[0018] According to the invention the center piece comprises a central part which extends around the valve axis such that it forms a sliding connection with the valve axis, and at least two support arms which extend from the central part to the flow controller and form a connection between the central piece and the flow controller.

[0019] In other words, the annular air deflector comprises the flow controller which is the part forming the collar on the valve plate when the annular air deflector is in contact with the valve plate, and the annular air deflector comprises the center piece which holds the flow controller at a distance from the valve axis. The central piece is formed of the central part and the support arms extending between the central part and the flow controller. The support arms are arranged on the annular air deflector in such a way that openings are formed between adjacent support arms, which enable air to flow through the annular air deflector. This means that when the annular air deflector is in contact with the valve plate, the air flowing from the side of the annular air deflector along the flow channel flows through the openings of the annular air deflector toward the valve plate. The central part is provided around the valve axis so that there is a sliding connection between the valve axis and the annular air deflector.

[0020] According to the invention both the valve plate and the annular air deflector are arranged to move on the valve axis along the flow channel.

[0021] In other words, the valve plate is arranged to move along the valve axis and the annular air deflector is arranged to move along the valve axis. The valve plate is arranged symmetrically on the valve axis and the annular air deflector is arranged symmetrically on the valve axis.

[0022] According to the invention the blast valve further comprises a first flow opening in connection with the first end of the valve body, which has a first flange arranged to define the first flow opening, and a second flow opening in connection with the second end of the valve body, which has a second flange arranged to define the second flow opening.

[0023] The first flow opening is provided in connection with the first end of the valve body which means that the first flow opening may be provided at the first end of the valve body or somewhere between the first end and the center of the valve body in the longitudinal direction of the valve body. The longitudinal direction of the valve body being the direction between the first end and the second end of the valve body. The same applies to the second flow opening so that the second flow opening may be provided at the second end of the valve body or somewhere between the second end and the center of the valve body in the longitudinal direction of the valve body. The first flange defines the first flow opening and the second flange defines the second flow opening. The first flange and the second flange are arranged to extend from the valve body towards the valve axis. This means that the first flange and the second flange are arranged to extend on the inside of the valve body. The first flange and the second flange are arranged to extend along the cross-section of the valve body coaxially with the valve axis. The first flange and / or the second flange provide a contacting surface either for the edge region of the valve plate or for the flow controller of the annular air deflector when they move along the valve axis to the flow opening. The valve plate closes the flow opening when in contact with the flange, therefore the diameter of the valve plate is greater than the diameter of the first flow opening and / or the second flow opening.

[0024] According to the invention the plate surface of the valve plate is larger than the first flow opening such that the valve plate is arranged to cover the first flow opening when the valve plate is arranged against the first flange of the first flow opening, and / or the plate surface of the valve plate is larger than the second flow opening such that the valve plate is arranged to cover the second flow opening when the valve plate is arranged against the second flange of the second flow opening.

[0025] In other words, the diameter of the valve plate is greater than the diameter of the first flow opening and / or the second flow opening.

[0026] According to the invention the flow controller of the annular air deflector is arranged at such a distance from the valve axis that when the annular air deflector is arranged in connection with the first flow opening, the flow controller is against the first flange surrounding the first flow opening, or the flow controller of the annular air deflector is arranged at such a distance from the valve axis that when the annular air deflector is arranged in connection with the second flow opening, the flow controller is against the second flange surrounding the second flow opening.

[0027] In other words, the flow controller is arranged at such a distance from the central part of the center piece that when the annular air deflector is at the first or second flow opening, the flow controller is against the first or second flange.

[0028] According to the invention the valve axis is arranged coaxially with the valve body and attached to the valve body.

[0029] In other words, the valve axis is arranged to extend in the flow channel of the valve body such that it extends coaxially with the valve body. The valve axis is connected to the valve body at one or both ends or from another part of the valve axis.

[0030] According to the invention the blast valve further comprises a first spring arranged on the valve axis in connection with the annular air deflector, and a second spring arranged on the valve axis in connection with the valve plate.

[0031] In other words, the valve axis comprises a first spring and a second spring such that the first spring is arranged in connection with the annular air deflector and the second spring is arranged in connection with the valve plate. The first spring is arranged to extend preferably between the first axis end and the annular air deflector and the second spring is arranged to extend preferably between the second axis end and the valve plate. Alternatively, the second spring is arranged to extend between the first axis end and the annular air deflector and the first spring is arranged to extend between the second axis end and the valve plate. The annular air deflector and the valve plate are immediately successive on the valve axis, which means that there is no spring between the annular air deflector and the valve plate. The springs are provided on the valve axis in connection with both the annular air deflector and the valve plate because they both need to be movable back into a normal position when the pressure blast has occurred and the situation has normalised. The normal position of the annular air deflector and the valve plate is at a distance from both the first flow opening and the second flow opening and preferably halfway between them. The first spring which is at the first valve end from where the air flow comes to the blast valve is for those situation when there is a negative phase of the blast pressure sucking air back to the blast valve in the opposite direction than during the pressure blast, when the annular air deflector and / or valve plate presses against the first flange and closes the first flow opening. After the situation normalises the first spring pushes the valve plate and the annular air deflector back to the normal position.

[0032] The blast wave, i.e. the pressure blast, causes an increased pressure and flow resulting from the deposition of a large amount of energy in a small, very localized volume. The blast wave is followed by a blast wind of negative gauge pressure, which sucks the air back.

[0033] According to the invention the first spring is arranged on the valve axis between the first axis end and the annular air deflector, and the second spring is arranged on the valve axis between the second axis end and the valve plate, or the first spring is arranged on the valve axis between the second axis end and the annular air deflector, and the second spring is arranged on the valve axis between the first axis end and the valve plate.

[0034] According to the invention the valve plate and the annular air deflector are arranged in immediate succession on the valve axis.

[0035] This means that there is no other element on the valve axis between the annular air deflector and the valve plate.

[0036] According to the invention the first axis end of the valve axis is connected to the valve body with a connecting element, or the second axis end of the valve axis is connected to the valve body with a connecting element, or both the first axis end and the second axis end are connected to the valve body with a connecting element

[0037] In other words, the valve body comprises a connecting element for the valve axis, from which the valve axis is attached to the valve body via the connecting element The connecting element can be arranged at one end of the flow channel or at both ends of the flow channel. So, there can be one or more connecting elements for the valve axis. The end of the flow channel may not necessarily be the same as the end of the valve body, but it can be. The end of the flow channel may be regarded as the point at which the flange is provided, thereby meaning that the first end of the flow channel is where the first flange is arranged, and the second end of the flow channel is where the second flange is arranged.

[0038] According to the invention the connecting element is arranged in connection with the first flow opening such that the connecting element forms at least two flow opening segments in the first flow opening, or the connecting element is arranged in connection with the second flow opening such that the connecting element forms at least two flow opening segments in the second flow opening, or the flow channel comprises two connecting elements such that the connecting element is arranged in connection with the first flow opening such that the connecting element forms at least two flow opening segments in the first flow opening, and the connecting element is arranged in connection with the second flow opening such that the connecting element forms at least two flow opening segments in the second flow opening.

[0039] In other words, the connecting element is arranged in connection with the first or second flow opening or both flow openings comprise the connecting element. The connecting element can be arranged in contact with the first or second flange in such a way that the connecting element is arranged on the opposite side of the flange than the one against which the valve plate or annular air guide moves. Alternatively, the connecting element can be arranged close to the flange but not in contact with the flange. Still alternatively, the connecting element can be arranged between the first flange and the first end of the valve body and / or between the second flange and the second end of the valve body.

[0040] According to the invention the annular air deflector is arranged on the valve axis on the side of the valve plate that is closer to the first axis end, or the annular air deflector is arranged on the valve axis on the side of the valve plate that is closer to the second axis end, or the blast valve comprises annular air deflectors on both sides of the valve plate.

[0041] In other words, the annular air deflector can be arranged on either side of the valve plate on the valve axis or both sides of the valve plate.

[0042] An advantage of the invention of having a separate annular air deflector and a valve plate is that the manufacturing of the parts becomes simpler compared to the prior art valve plate having the firm flow guide. This means for example that there is no need for special tools when manufacturing the valve plate and the annular air deflector compared to the valve plate having the firm flow guide. Also, the weight of the parts, i.e. the weight of the valve plate and the annular air deflector, is easier to control when the parts are separate. The weight of the parts is decisive for the response time of the blast valve in an emergency situation.

[0043] BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The invention is described in detail by means of specific embodiments with reference to the enclosed drawings, in which

[0045] Figure la shows a valve plate and an annular air deflector on a valve axis;

[0046] Figure lb shows the valve plate and the annular air deflector as seen along the valve axis;

[0047] Figure 2 shows the blast valve according to the invention;

[0048] Figure 3 shows the blast valve according to the invention in a normal mode;

[0049] Figure 4 shows the blast valve according to the invention in a closed position;

[0050] Figure 5 shows the blast valve according to the invention in a pressure backlash situation;

[0051] Figure 6 shows the blast valve according to the invention as seen from the end of the valve body;

[0052] Figure 7 shows the blast valve according to the invention;

[0053] Figure 8 shows the blast valve according to the invention;

[0054] Figure 9 shows another example of the blast valve according to the invention; and

[0055] Figure 10 shows the blast valve shown in figure 9 in a closed position.

[0056] DETAILED DESCRIPTION OF THE INVENTION

[0057] Figure la shows a valve plate 11 and an annular air deflector 12 on a valve axis 13. The valve axis 13 has a first axis end 13a and a second axis end 13b and the valve plate 11 and the annular air deflector 12 are arranged on the valve axis 13 between the first axis end 13a and the second axis end 13b.

[0058] Figure lb shows the valve plate 11 and the annular air deflector 12 as seen along the valve axis 13 from the cut-out line A- A (shown in figure la). The annular air deflector 12 has a center piece 12a and a flow controller 12b around the center piece 12a. The flow controller 12b is coaxial with the valve plate 11 seen behind the annular air deflector 12 and the diameter of the annular air deflector conforms with the diameter of the valve plate in this embodiment of the invention. The diameter of the annular air deflector 12 and the valve plate 11 may not necessarily be the same. The flow controller 12b is arranged to connect to the center piece 12a through the support arms 12a.2 extending between the flow controller 12b and a central part 12a.l which is arranged around the valve axis 13. The central part 12a.l and the valve axis form a sliding connection such that the annular air deflector 12 is configured to slide along the valve axis 13. The support arms 12a.2 are arranged in the annular air deflector 12 such that openings are formed between adjacent support arms 12a.2 so that the air flow coming through the flow channel reaches the valve plate 11, which is on the valve axis 13 after the annular air deflector 12.

[0059] Figure 2 shows the blast valve 1 according to the invention which comprises a valve body 10 having a first end 10a and a second end 10b and a flow channel 100 extending between the first end 10a and the second end 10b. The valve body 10 is provided with a valve axis 13 extending in the direction between the first end 10a and the second end 10b of the valve body 10 and the valve axis 13 having a first axis end 13a and a second axis end 13b. In this embodiment of the invention the valve axis 13 is attached to the valve body 10 from the second axis end 13b with a connecting element 20 at the second end 10b of the valve body 10. The connecting element 20 is attached to the valve body 10 and in this embodiment of the invention also forms a second flange 19. Although for the sake of simplicity the connecting element 20 and the second flange 19 are drawn as one piece, in reality the connecting element 20 and the second flange 19 can be separate parts that are connected to the valve body 10 or formed from the valve body 10. That kind of embodiment can be seen in connection with figure 8 but is applicable also in the embodiment shown in this figure. The first axis end 13a of the valve axis 13 is provided with a stopping element 21 such as a nut in this embodiment, but the first axis end 13a may alternatively be provided with the connecting element 21 as well, which is shown in figure 7. The valve axis 13 is provided with the annular air deflector 12 and the valve plate 11 which are arranged on the valve axis 13 in immediate succession. The valve axis 13 is also provided with a first spring 14 in connection with the annular air deflector 12 and a second spring 15 in connection with the valve plate 11. The first spring 14 is arranged between the stopping element 21 at the first axis end 13a and the annular air deflector 12, and the second spring 15 is arranged between the valve plate 11 and the connecting element 21 at the second axis end 13b. The valve body 10 is also provided with a first flange 18 extending inside the valve body 10 from the valve body 10 towards the valve axis 13. The first flange 18 defines the first flow opening 16. The first flange 18 may be provided at the first end 10a of the valve body 10 or, as shown in figure 2, in connection with the first end 10a of the valve body 10 but not literally at the first end 10a. The second flange 19 is provided at the second end 10b of the valve body 10, or as shown in figure 2, in connection with the second end 10b of the valve body 10. The second flange 19 defines the second flow opening 17.

[0060] Figure 3 shows the blast valve 1 according to the invention in a normal mode which means that the air exchange through the flow channel 100 is normal air exchange without pressure blasts. The blast valve 1 in figure 3 is the same as in figure 2 so the features of the blast valve are not explained here again due to repetition. However, the figure shows the air flow in normal conditions as shown by the arrows. The air flow bypasses the annular air deflector 12 and the valve plate 11 which are provided in the midsection of the flow channel, i.e. at a distance from the first flow opening 16 and from the second flow opening 17. The normal air flow does not move the annular air deflector 12 and the valve plate 11 along the valve axis 13.

[0061] Figure 4 shows the blast valve 1 according to the invention in a closed position, where the pressure blast has occurred and has closed the valve plate 11, while the annular air deflector 12 has remained in motion after the valve plate 11 to catch the air caused by the pressure blast The arrows show the path of the air when the pressure blast has happened. When the pressure blast comes to the blast valve 1, the air flow flows through the annular air deflector 12 and presses the valve plate 11 against the second flange 19 and closes the second flow opening 17. The flow controller 12a of the annular air deflector 12 catches the pressure blast As the valve plate 11 has closed the second flow opening 17 there is no air flow through the blast valve 1 to the shelter which is on the side of the second end 10b of the valve body 10. The second spring 15 presses between the valve plate 11 and the connecting element 20 so that when the air flow coming with the pressure blast normalises the valve plate 11 will be pushed back again in the normal position shown in figure 3 with second spring 15. The features of the blast valve 1 shown in figure 4 are otherwise the same as already explained in connection with the figure 2.

[0062] Figure 5 shows the blast valve 1 according to the invention in a backlash situation in which the pressure blast has already occurred and closed the second flow opening 17 to the shelter. In the backlash situation the air flow flows back from the shelter, i.e. the air flow is in opposite direction than during the pressure blast situation. The pressure blast is therefore a positive phase of a blast and the backlash is a negative phase of the blast, in which the air is sucked back through the blast valve 1. The arrows in figure 5 show the direction of the air flowing in the blast valve 1. In this situation both the annular air deflector 12 and the valve plate 11 have moved against the first flange 18 to close the first flow opening 16. After the backlash flow the first spring 14 which is now pressed between a stopping element and the annular air deflector 12 pushes them back to the normal position. The features of the blast valve 1 shown in figure 5 are otherwise the same as already explained in connection with the figure 2.

[0063] Figure 6 shows the blast valve 1 according to the invention as seen from the second end 10b of the valve body 10 from the cut-out line B-B (shown in figure 2). The valve body 10 shown in figures is tubular, although having a larger crosssection preferably in the middle of the valve body 10. The larger cross-section provides more space in the flow channel 100 for the annular air deflector 12 and the valve plate 11, which can fit there in a normal situation so that the air flows around them from the first flow opening 16 to the second flow opening 17. The second flange 19 is provided in the valve body 10 to extend from the valve body 10 towards the valve axis 13. The second axis end 13b is connected to the connecting element 20 which in the embodiment shown in figures 2 and 6 also provide the second flange 19 for the valve body 10. The connecting element 20 and the flange can alternatively be separate elements. The connecting element 20 attaching the valve axis 13 to the valve body 10 is formed such that it provides the flow opening 17 for the air to flow from the valve body 10 to outside the valve body. The flow opening 17 is formed from flow opening segments 17a, 17b such that there are at least two flow opening segments 17a, 17b forming the flow opening 17. In the figure 6 shown the second flow opening 17 is formed of three flow opening segments 17, 17a, 17b. The valve plate 11 is shown next to the connecting element 20.

[0064] Figure 7 shows the blast valve 1 according to the invention in which the valve body 10 is provided with two connecting elements 20 at both ends of the valve body 10 for connecting the valve axis 13 to the valve body 20. In this example both connecting elements 20 also form the flanges for the annular air deflector 12 and for the valve plate 11. Also, as compared to the previous figures the valve plate 11 and the annular air deflector 12 are provided in different order on the valve axis 13. This is especially advantageous when the blast valve is arranged to the wall of the shelter so that the pressure blast is considered to enter from the second end 10b of the valve body 10. All the other features of the blast valve 1 are the same as already discussed in connection with the figure 2.

[0065] Figure 8 shows the blast valve 1 according to the invention in which the valve body is provided with the connecting element 20 at the second end 10b of the valve body 10 together with a separate flange, i.e. the second flange 19. Another difference for the previous examples of the blast valve 1 is that the valve plate 11 on the valve axis 13 is provided with two annular air deflectors 12 on the opposite sides of the valve plate 11. All the other features of the blast valve 1 are the same as already discussed in connection with the figure 2.

[0066] Figure 9 shows an example of the blast valve 1 according to the invention in a normal mode which means that the air exchange through the flow channel 100 is normal air exchange without pressure blasts. The normal air exchange can be for example exhaust gas flow in certain special valve installation locations. The valve body 10 is similar as the blast valves 1 already described above, so that the valve body 10 has the first end 10a and the second end 10b and the flow channel 100 extending between the first end 10a and the second end 10b. The valve body 10 is provided with the valve axis 13 extending in the direction between the first end 10a and the second end 10b of the valve body 10.

[0067] The valve axis 13 is provided with the annular air deflector 12 and the valve plate 11 which are arranged on the valve axis 13 in immediate succession. The valve body 10 is also provided with a first flange 18 extending inside the valve body 10 from the valve body 10 towards the valve axis 13. The first flange 18 defines the first flow opening 16. The second flange 19 is provided in connection with the second end 10b of the valve body 10. The second flange 19 defines the second flow opening 17. The valve axis 13 is provided with a stopping element 22 which can be connected to the second flange 19. The stopping element 22 prevents the valve plate 11 from closing the second flow opening 17, so that the normal air flow, which can be for example the exhaust gas flow, is allowed to flow through the second flow opening 17 all the time. The air flow is shown with arrows. The air flow bypasses the valve plate 11 and the annular air deflector 12 and flows through the second flow opening 17 away from the blast valve 1.

[0068] Figure 10 shows the blast valve 1 shown in figure 9 when a pressure blast has occurred and closed the blast valve 1 so that it is in a closed position. The valve plate 11 has closed the first flow opening 16, while the annular air deflector 12 has remained in motion after the valve plate 11 to catch the air caused by the pressure blast. The bold arrows show the path of the blast air when the pressure blasthas happened. When the pressure blast comes to the blast valve 1, the air flow flows through the annular air deflector 12 and presses the valve plate 11 against the first flange 18 and closes the first flow opening 16. The flow controller 12a of the annular air deflector 12 catches the pressure blast As the valve plate 11 has closed the first flow opening 16 there is no air flowthrough the blast valve 1. When the pressure blast is over and the air exchange normalises, the valve plate 11 moves towards the second flow opening 17 under the influence of the air flow, but is stopped with the stopping element 22 so that the second flow opening 17 remains open as explained in connection with figure 9. Other features shown in figure 10 are already explained in connection with previous figures. The invention has been described above with reference to the examples shown in the figures. However, the invention is in no way restricted to the above examples but may vary within the scope of the claims.

Claims

CLAIMS1. A blast valve (1) for a shelter, characterized in that the blast valve (1) comprises: a valve body (10) forming a flow channel (100), the valve body (10) has a first end (10a) and a second end (10b), and the flow channel (100) extends between the first end (10a) and the second end (10b); a valve plate (11) provided inside the valve body (10) and extending across the flow channel (100), the valve plate (11) has a plate surface(11a); an annular air deflector (12) provided in the flow channel (100) and arranged to co-operate with the valve plate (11) for capturing pressure blasts acting upon the valve plate (11); and a valve axis (13) having a first axis end (13a) and a second axis end (13b), the valve axis (13) is arranged to extend along the flow channel (100), the valve plate (11) and the annular air deflector (12) are separately arranged on the valve axis (13) such that the valve plate (11) and the annular air deflector (12) are independently movable along the valve axis (13).

2. A blast valve (1) according to claim 1, characterized in that the annular air deflector (12) comprises a center piece (12a) and a flow controller (12b) connected to the center piece (12a), the center piece (12a) is arranged on the valve axis (13), and the flow controller (12b) is arranged to extend around the center piece (12a) at a distance from the valve axis (13) such that when in contact with the valve plate (11) the flow controller (12b) forms a collar on the valve plate (11) which the collar extends away from the plate surface (11a) in a transverse direction to the plate surface (11a).

3. A blast valve (1) according to claim 2, characterized in that the flow controller (12b) is arranged coaxially with the valve axis (13).

4. A blast valve (1) according to claim 2, characterized in that the center piece (12a) comprises a central part (12a.l) which extends around the valve axis (13) such that it forms a sliding connection with the valve axis (13), and atleasttwo support arms (12a.2) which extend from the central part (12a.l) to the flow controller (12b) and form a connection between the central piece (12a) and the flow controller (12b).

5. A blast valve (1) according to any preceding claim, characterized in that both the valve plate (11) and the annular air deflector (12) are arranged to move on the valve axis (13) along the flow channel (100).

6. A blast valve (1) according to any preceding claim, characterized in that the blast valve (1) further comprises a first flow opening (16) in connection with the first end (10a) of the valve body (10), which has a first flange (18) arranged to define the first flow opening (16), and a second flow opening (17) in connection with the second end (10b) of the valve body (10), which has a second flange (19) arranged to define the second flow opening (17).

7. A blast valve (1) according to claim 6, characterized in that the plate surface (11a) of the valve plate (11) is larger than the first flow opening (16) such that the valve plate (11) is arranged to cover the first flow opening (16) when the valve plate (11) is arranged against the first flange (18) of the first flow opening (16), and / or the plate surface (11a) of the valve plate (11) is larger than the second flow opening (17) such that the valve plate (11) is arranged to cover the second flow opening (17) when the valve plate (11) is arranged against the second flange (19) of the second flow opening (17).

8. A blast valve (1) according to claim 6, characterized in that the flow controller (12b) of the annular air deflector (12) is arranged at such a distance from the valve axis (13) that when the annular air deflector (12) is arranged in connection with the first flow opening (16), the flow controller (12b) is against the first flange (18) surrounding the first flow opening (16), or the flow controller (12b) of the annular air deflector (12) is arranged at such a distance from the valve axis (13) that when the annular air deflector (12) is arranged in connection with the second flow opening (17), the flow controller (12b) is against the second flange (19) surrounding the second flow opening (17).

9. A blast valve (1) according to any preceding claim,characterized in that the valve axis (13) is arranged coaxially with the valve body (10) and attached to the valve body (10).

10. A blast valve (1) according to any preceding claim, characterized in that the blast valve (1) further comprises a first spring(14) arranged on the valve axis (13) in connection with the annular air deflector (12), and a second spring (15) arranged on the valve axis (13) in connection with the valve plate (11).

11. A blast valve (1) according to claim 10, characterized in that the first spring (14) is arranged on the valve axis (13) between the first axis end (13a) and the annular air deflector (12), and the second spring (15) is arranged on the valve axis (13) between the second axis end (13b) and the valve plate (11), or the first spring (14) is arranged on the valve axis (13) between the second axis end (13b) and the annular air deflector (12), and the second spring(15) is arranged on the valve axis (13) between the first axis end (13a) and the valve plate (11).

12. A blast valve (1) according to any preceding claim, characterized in that the valve plate (11) and the annular air deflector (12) are arranged in immediate succession on the valve axis (13).

13. A blast valve (1) according to any preceding claim, characterized in that the first axis end (13a) of the valve axis (13) is connected to the valve body (10) with a connecting element (20), or the second axis end (13b) of the valve axis (13) is connected to the valve body (10) with a connecting element (20), or both the first axis end (13a) and the second axis end (13b) are connected to the valve body (10) with a connecting element (20).

14. A blast valve (1) according to claim 13, characterized in that the connecting element (20) is arranged in connection with the firstflow opening (16) such that the connecting element (20) forms at least two flow opening segments (16a, 16b) in the first flow opening (16), or the connecting element (20) is arranged in connection with the second flow opening (17) such that the connecting element (20) forms at least two flow opening segments (17a, 17b) in the second flow opening (17), or the flow channel (100) comprises two connecting elements (20) such that the connecting element (20) is arranged in connection with the first flow opening (16) such that the connecting element (20) forms at least two flow opening segments (16a, 16b) in the first flow opening (16), and the connecting element (20) is arranged in connection with the second flow opening (17) such that the connecting element (20) forms at least two flow opening segments (17a, 17b) in the second flow opening (17).

15. A blast valve (1) according to any preceding claim, c h a r a c t e r i z e d in that the annular air deflector (12) is arranged on the valve axis (13) on the side of the valve plate (11) that is closer to the first axis end (13a), or the annular air deflector (12) is arranged on the valve axis (13) on the side of the valve plate (11) that is closer to the second axis end (13b), or the blast valve (1) comprises annular air deflectors (12) on both sides of the valve plate (11).

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