JP4026855B2 - Adjustable elements, in particular compressed air cylinders for operating the flue gas valves of flue gas and heat exhaust systems - Google Patents

Abstract

A pneumatic cylinder for actuating fume extraction valves in fume and heat extraction plants has a piston (2) that may be actuated from both sides with at least one working surface and that can be made to slide by pressurised air in a cylinder (1) with at least one working chamber (4), as well as an energy accumulator with regulating means. The regulating means can be controlled by control means to open or keep open the fume extraction valves. In order to obtain a compact pneumatic cylinder for a fume and heat extraction plant which is easy to install, a storage chamber in which air or pressurised air is stored as compressible pressure medium is provided as energy accumulator. The storage chamber is in communication with a compression surface (7) of the piston (2), at its side opposite to the working surface (7), so that pressure medium may flow between the storage chamber and the compression surface (7). The controller actuates a venting valve in communication with the working chamber (4) so that pressurised air may flow between the venting valve and the working chamber (4).

Description

【Technical field】
The present invention is based on the superordinate concept of claim 1 and relates to an adjustable element, in particular a compressed air cylinder for operating a flue gas valve applied to a flue gas / heat exhaust system.
[Background]
A compressed air cylinder having pistons acting on both sides and having at least one working surface, which is slid by compressed air in a cylinder having at least one working chamber, is, for example, a flue gas / heat exhaust system ( (Abbreviation: RWA equipment), smoke that makes it difficult to rescue or prevents rescue by opening the exhaust / heat exhaust valve automatically or remotely by applying compressed air to the cylinder space or cylinder chamber in the event of a fire Used to remove and create access paths important for rescue. In addition to this, it is also intended to prevent the formation of thermal dams by opening the exhaust heat / smoke exhaust valve. The compressed air cylinder used in such cases must meet high reliability requirements. In this regard, it is known to ensure sufficient functional reliability by providing a terminal position locking device in the compressed air cylinder. In addition to these functions, a terminal position locking device which is particularly suitable for restraining the piston rod of the compressed air cylinder in an intermediate position is coaxial with the piston rod and can be moved toward the rod until it abuts the piston rod. A locking rod is provided, the auxiliary locking rod being characterized in that it restricts the partial stroke of the piston rod and penetrates into a locking cylinder arranged on the outer periphery of the locking piston at its partial stroke position (EP 0 363). 575 B1). The auxiliary locking piston slides in the locking cylinder, and in its partial stroke position, it is fitted into an annular groove provided in the auxiliary locking, or a radially movable ball is covered with a sleeve-like member. To do. The radially movable ball is released by moving its sleeve-like member in the axial direction. When the predetermined pressure is exceeded, the auxiliary locking piston is connected to the adjacent cylinder space via a pressure-controlled check valve. This intermediate position restraint system is combined with the locking element of the end position locking device formed as a ball fitted and held in the groove of the piston rod via a spring-loaded locking piston.
The above reliability requirements for the compressed air cylinders used include that the compressed air cylinders can be surely opened or kept open without any errors in connection with the cylinders in the event of a fire. The terminal position locking device satisfies these conditions. In order to reliably open the exhaust valve even in the event of a fire, the pressure transmission medium is supplied via a fire prevention pipe in an RWA cylinder that operates with a compressed medium.
DISCLOSURE OF THE INVENTION
[Problems to be solved by the invention]
However, the use and installation of fire protection piping means considerable additional costs.
Another known configuration for carrying out fire prevention construction with RWA equipment composed of RWA cylinders is to provide a gas pressure spring in the RWA cylinder. However, it is difficult to say that the gas pressure spring has sufficient reliability even if the cost required for it is ignored.
It is also known to couple to the RWA cylinder a mechanical spring that accumulates sufficient energy that can be brought into the open position by rotating the smoke exhaust valve along with the moving part of the RWA cylinder in the event of a fire. However, the provision of such an auxiliary spring increases the size of the RWA cylinder, and in particular makes it longer and inconvenient to handle.
The object of the present invention is to be as compact as possible, in particular as described at the beginning as an RWA cylinder, which can be easily installed in RWA equipment, without the need for additional auxiliary energy species and in particular no additional external fire protection piping. It is to provide a compressed air cylinder.
[Means for Solving the Problems]
The object is solved by forming a compressed air cylinder of the kind mentioned at the outset having the features set forth in the characterizing part of claim 1.
This compressed air cylinder does not require any additional auxiliary energy species because it is controlled only by a given compressible compressed medium, i.e. in particular compressed air, for normal operation. The purpose was to adjust the position of adjustable elements. In particular, during the normal operation of the compressed air cylinder for closing the flue gas valve, the air confined in the pressure accumulator chamber of the compressed air cylinder is naturally compressed, so that this air cooperates with the piston in the air spring. Form. For adjusting the position of the adjustable element in the opposite direction, and thus opening the smoke exhaust valve especially in the event of a fire, it is sufficient to reduce the pressure on the working side of the piston by exhausting the working chamber, The piston is slid under the action of compressed air in the accumulator chamber. Therefore, the operation system according to the present invention is based on the pressure-pressure chamber in contact with the compression surface of the piston opposite to the operation surface before the piston receives pressure on the operation surface and can sufficiently compress the compressive air in the accumulator chamber. It is assumed that the air is sufficiently filled in advance. The pressure created in the accumulator chamber is determined from the area ratio of the working surface and the compression surface of the piston (in this case, the area of the working surface is particularly small compared to that of the compression surface) as well as the stroke of the piston or the first end position. It depends on the displacement volume of the piston as it moves to the second end position. This function is based on the premise that as long as the ambient conditions (temperature) remain unchanged, air loss in the accumulator chamber does not occur as much as possible, especially during subsequent stroke movements.
The smoke exhaust valve rotates further beyond a predetermined opening angle (typically 90 °) under the influence of gravity and reaches a large opening angle, for example 140 °, via the usual mechanical connection element When an RWA facility that is forced to entrain a piston rod of a compressed air cylinder is equipped with a compressed air cylinder, air is sucked into the accumulator chamber and replenished, so that pressure medium loss in the preceding phase is at least partially Will be compensated for. Appropriate structural measures to intentionally use the suction effect in such RWA equipment with a large opening angle are: Claim 7 It is described in.
According to the above claims, the main point of the pressure medium replenishing device with a simple structure especially for the special RWA equipment is preferably as a pressure medium suction device in the form of a low pressure valve, preferably on the cylinder bottom or on the cylinder wall. The cylinder space formed and separated from the working chamber is connected to the outside air via its valve. It is appropriately realized that air is sucked from outside air through the valve to fill the accumulator chamber with air by using the normal function of the compressed air cylinder. Further, a compact structure is realized by such a configuration of the compressed air cylinder.
Instead of the above configuration, as a pressure medium replenishing device, Claim 1 As described, the configuration may be such that the working chamber and the cylinder space separated from the chamber are connected via a flow channel provided with a differential pressure limiter that is automatically controlled mechanically. In this case, the differential pressure between the working chamber and the accumulator chamber is preferably preset in the differential pressure limiter at the piston position where the compression pressure of the compressed air contained in the accumulator chamber, preferably provided by the stopper, is maximum. When the value is exceeded, the channel leading to the working chamber is opened. At this time, partial pressure compensation is performed, so that if the pressure medium is lost due to leakage, the pressure accumulating chamber is automatically replenished.
Specifically, this form of pressure medium replenishment device is Claim 1 It is preferably formed in the piston as described. A first slide valve and a check valve as a differential pressure limiter are arranged in the piston so that the flow channel in the piston between the working chamber and the cylinder space separated from the chamber is opened. The In order to open the flow channel, the first slide valve is actuated by a thrust bar arranged in the cylinder space forming the accumulator chamber. The flow channel in the piston is a first slide valve, in particular its thrust bar abuts against a stopper or similar solid surface by the piston, and the pressure difference between the working chamber and the cylinder space is preset to the check valve It will be released if it exceeds.
One preferred embodiment of the compressed air cylinder is that the check valve is formed as a second slide valve, and the second slide valve and the first slide valve with protruding thrust rods are a common hole in the piston. The first slide valve and the second slide valve are directed toward the outer seal surface by a coil spring disposed between the first slide valve and the second slide valve. It is characterized by being pressed. This embodiment is advantageous in manufacturing in that only one hole needs to be formed in the piston, particularly for two slide valves composed of a small number of parts.
The first slide valve and the second slide valve are each formed as a rubber molded product having a seal bead formed in an annular shape on the outer front surface, so that a particularly good seal that enables the highest pressure accumulation is obtained. Realized.
The function of the first slide valve located in the piston assumes that a stopper or similar solid surface limits the movement of the piston. This stopper or solid surface is arranged in a cylinder space separated from the working chamber, which cylinder space forms the entire pressure accumulator chamber (see claim 2) or forms part of the accumulator chamber (claim). Item 3).
3. The arrangement according to claim 2, wherein the accumulator chamber is entirely formed by a basically sealed cylinder space separated from the working chamber by a piston in the cylinder, and the cylinder has a very simple structure with a relatively small diameter. Become.
In the configuration according to claim 3, wherein the cylinder space forming a part of the pressure accumulation chamber and the partial pressure accumulation chamber are connected via the flow channel, the partial pressure accumulation chamber can be formed very freely. The partial pressure accumulating chamber is preferably an annular chamber disposed around the cylinder. As a result, the cylinder has a relatively short structure, but the outer periphery is relatively large. It is also preferable to structurally separate this partial pressure accumulation chamber from the cylinder or cylinder unit as an external pressure accumulation chamber.
Claim 1 As in the described configuration, the sliding of the piston into the cylinder space that is generally separated from the working chamber and forms or forms part of the accumulator chamber is limited by a stopper. In this case, the stopper may be arranged outside the cylinder space, and may be configured to act on the piston rod, for example. The final pressure in the storage chamber due to compression of the compression medium (air or compressed air in the present invention) is also determined by the stopper. The final pressure is selected such that the power-stroke curve of the compressed air shilling is always above the load curve determined by the operation of the smoke exhaust valve.
further Claim 8 As in the arrangement described, the cylinder space separated from the working chamber is preferably connected to the outside air via a high-pressure limiting valve located on the cylinder bottom or cylinder wall. As a result, even if the ambient temperature rises, the final pressure in the pressure accumulating chamber does not exceed a predetermined value, ensuring the normal function of the compressed air cylinder and avoiding overloading of the exhaust heat valve and the connecting element coupled thereto. Is done.
As mentioned above, the compressed air cylinder Claim 9 It is preferred to have a terminal position locking device acting on the piston rod as in the arrangement described, by means of which the piston is locked to at least one terminal position when the working chamber is evacuated, The valve can be kept open.
Claim 10 In the described separate arrangement, a double-sided end position locking device for the piston rod is provided.
Claim 11 It is emphasized that the pressure accumulator chamber is prefilled with air (this air may be branched from the compressed air for operating the compressed air cylinder).
BEST MODE FOR CARRYING OUT THE INVENTION
In the following, six embodiments of the compressed air cylinder according to the present invention having the features of the present invention will be described with reference to FIG. Each figure has shown the longitudinal cross-section of each Example.
FIG. 1 shows the entirety of a compressed air cylinder 1 having a piston rod 3 and a piston 2 that can be acted on from both sides. The piston 2 separates the working chamber 4 from the cylinder space 5 which is formed as air as a compression medium or a pressure accumulating chamber for accumulating compressed air. A stopper 8 is attached to the center of the cylinder bottom 9 inside the cylinder space 5.
The cylinder bottom 9 is provided with a flow channel 11 that connects the cylinder space 5 to outside air (not shown), and a low-pressure valve 10 is provided in the flow channel 11. The low pressure valve 10 incorporates a spring-loaded ball. When the piston is in the position shown in FIG. 1, when the pressure in the cylinder space 5 falls below the external pressure by a predetermined value, the ball The flow channel 11 is opened by being pushed toward the inner cylinder space 5 by the external atmospheric pressure. In this case, air is replenished to the cylinder space under atmospheric pressure.
Similarly, the high pressure limiting valve 12 provided in the cylinder bottom 9 is configured in the same manner as the low pressure valve 10. However, the high pressure limiting valve 12 is disposed in the flow channel 13 in the direction opposite to the low pressure valve 10. Therefore, this valve opens the flow channel 13 in the direction of the outside air when the piston 2 is in the position shown in FIG. 2 and the pressure in the cylinder space 5 is higher than the value preset in the high-pressure limiting valve 12. To do.
The basic function of the compressed air cylinder 1 shown in FIGS. 1 and 2 is as described below. In this case, the piston rod 3 is connected to a rotary smoke exhaust valve in the RWA facility via a connecting element (not shown). It is assumed that
In order to set the smoke exhaust valve opened at the position of the piston 2 and the piston rod 3 shown in FIG. 1 to the closed position, the working chamber 4 is connected to a means (not shown) via a connecting hole 14 and a flow channel 15. In particular, compressed air is supplied through a control valve. Compressed air acts on the piston 2 via the piston working surface 6, and this piston has a relatively low pressure in the initial state shown in FIG. It can be slid to the right. When the piston 2 slides in the direction of the cylinder space 5, the air previously filled in the space 5 is compressed by the compression surface 7 of the piston that moves toward the cylinder bottom 9. In that case, the cylinder space 5 is shown in FIG. 2 from the end position shown in FIG. 1 under the action of the ratio of the working surface 6 to the compression surface 7 and the pressure of the compressed air in the working chamber 4. Depending on the piston displacement volume that the piston 2 excludes in the cylinder space 5 when being slid to the end position, a high pressure that is lower than the pressure of the compressed air in the working chamber 4 is generated. Thus, when the pressure of the air compressed in the cylinder space 5 exceeds a predetermined value particularly when the ambient temperature subsequently increases, the high-pressure limiting valve 12 opens.
Therefore, in the terminal position shown in FIG. 2, the piston 2 is in a state of receiving the force of the pressure of the compressible air in the cylinder space 5 as the pressure accumulation chamber.
If a smoke exhaust valve not shown is to be opened, for example in the event of a fire, there is no need to supply further energy to the compressed air cylinder, but rather a valve device (not shown) connected to the connecting hole 14 (this is It is sufficient to evacuate the working chamber through, for example, a solenoid valve or a 3-way / 2-way valve. Therefore, in this case, since the pressure in the working chamber 4 is substantially equal to the pressure of the outside air, the piston 2 is again shown in FIG. 1 from the end position shown in FIG. 2 under the pressure of air in the cylinder space 5. It returns to the end position and the smoke exhaust valve is opened. When a predetermined, for example 90 ° opening angle is exceeded when the smoke exhaust valve rotates, it automatically moves to the open end position, for example 140 °, pulling the piston rod 3 together with the piston 2, As a result, the pressure in the cylinder space 5 is reduced below the atmospheric pressure, and the cylinder space 5 will no longer be filled with sufficient air for the compression phase when the smoke exhaust valve is closed. In order to avoid this, as described above, the low pressure valve 10 is opened and a desired amount of air is supplied.
The second embodiment shown in FIGS. 3 and 4 differs from the first embodiment described above in that a pressure medium replenishing device is disposed on the piston 16 instead of the low pressure valve 10 disposed on the cylinder bottom. Yes. In addition, the same code | symbol is attached | subjected to the same element common to all the Examples of a compressed air cylinder. In particular, the pressure medium replenishing device arranged on the piston 16 basically comprises a spring-loaded first slide valve 17 with a thrust bar 19 protruding from the compression surface 18 of the piston and a pre-adjustable check. It consists of a valve 20. The first slide valve 17 and the check valve 20 are arranged in a non-referenced flow channel from the working chamber 4 through the pre-adjustable check valve 20 and the slide valve 17 to the cylinder space 5. Yes.
The second embodiment is also different from the first embodiment in terms of the structure of the cylinder bottom 21. In the second embodiment, the stopper 22 in the form of a hollow cylinder is formed integrally with the cylinder bottom 21. The first stick 19 of the slide valve 17 is formed so as to contact the front face 23 of the stopper.
In this embodiment, the high-pressure restriction valve 12 is coaxially arranged with the longitudinal axis 24 of the compressed air cylinder represented by a one-dot chain line, and the flow channel 13 of the high-pressure restriction valve 12 reaches the inside of the stopper 22. With such a structure, the pressure contact between the compression surface 18 of the piston 16 and the front surface 23 of the stopper is realized without tilting the piston while simultaneously operating the thrust bar 19.
In the position of the piston 16 corresponding to the open position of the smoke exhaust valve connected to the piston rod 3 shown in FIG. 3, the cylinder space 5 is sealed against the flow channel by the spring-loaded first slide valve 17. The flow channel via the pre-adjustable check valve 20 and the first slide valve 17 is closed.
For example, when compressed air is applied to the working chamber 4 via a three-way / two-way valve, the piston 16 has an initial pressure in the cylinder space 5 and the compression surface 18 of the piston 16 and the piston 16 whose sign is not indicated. Depending on the area ratio with respect to the working surface, while compressing the air previously filled in the cylinder space 5, the right stopper 23 again until the compression surface 18 of the piston 16 contacts the front surface 23 of the stopper 22. At the same time, the thrust bar 19 is pushed inward into the piston 16 against the spring load of the first slide valve 17, and the slide valve 17 moves the flow channel in the piston into the cylinder space. Open toward 5. At that time, when the final pressure (equal to the compression pressure) in the cylinder space 5 at the position where the piston 16 is in pressure contact with the stopper 22 is still low by the differential pressure set in the pre-adjustable check valve 20, The check valve opens until the differential pressure between the working chamber 4 and the cylinder space 5 reaches a pre-adjusted value. Accordingly, the same initial condition always exists for the movement of the piston from the end position shown in FIG. 4 to the end position shown in FIG. In the present embodiment, the above-described movement of the piston for opening the smoke exhaust valve is performed by exhausting the working chamber 4 through the connection hole 14 and a three-way valve / 2-way valve (not shown). In order to achieve the final pressure in the cylinder space 5 when the piston 16 is at the position shown in FIG. 4, the rotary rod is used to pull the piston rod 3 beyond a certain open position to a position corresponding to the fully open position. It is not necessary for the valve and the compressed air cylinder to be connected, rather the compressed air cylinder shown in FIGS. 3 and 4 can be used without such a restriction and achieves a predetermined final pressure in the cylinder space 5.
The function of the high-pressure limiting valve that ensures the final pressure even when the temperature changes, particularly when the ambient temperature rises, is the same as that of the first embodiment shown in FIGS.
In the third embodiment shown in FIGS. 5 and 6, the pressure accumulating chamber in which the air previously filled therein is compressed by the piston 16 is not formed entirely by the cylinder space 25. The pressure accumulation chamber is different from that of the second embodiment in that the pressure accumulation chamber is arranged around the cylinder 24 as the annular chamber 26. In this case, the annular chamber 26 is connected to the cylinder space 25 via at least one hole 27 arranged in the cylinder wall 28. Therefore, the pressure accumulation volume in this case is greater than the pressure accumulation volume of the cylinder space 5 in the second embodiment shown in FIGS. 3 and 4 assuming that the cylinder space 25 and the cylinder space 5 have the same volume. Is larger by the volume of the annular chamber 26. In other words, the structure of the compressed air cylinder 24 can be made shorter than the compressed air cylinder 1 shown in FIGS. 3 and 4 if the same total pressure accumulation volume needs to be realized. is there.
5 and FIG. 6 (in this case, the position of FIG. 5 corresponds to the position of FIG. 3 of the second embodiment, and the position of FIG. 6 is a diagram of the second embodiment). (Corresponding to position 4) is the same as the function described above.
The compressed air cylinder 29 according to the fourth embodiment shown in FIGS. 7 to 9 has a stopper 8 in the cylinder space, a low pressure valve 10 in the flow channel 11, and a high pressure restriction in the flow channel 13, particularly in the cylinder space 5. This corresponds to the first embodiment provided with a cylinder bottom 9 on which a valve 12 is arranged. To that end, refer to the first embodiment for functional explanation.
In this fourth embodiment, the piston 30 is coupled to a piston rod 32 protruding from the working surface 31 of the piston. The working surface 31 forms a limit of the working chamber 33, and the other limit of the chamber 33 is formed by the cylinder head 34.
In this embodiment, the cylinder head 34 is suitable for fixing the piston rod 32 to the position of FIG. 7 corresponding to the open position of the smoke exhaust valve (not shown) connected to the piston rod 32 on the outer front surface thereof. The terminal position locking device, generally designated 35, is accommodated. For this purpose, the end position locking device has a locking piston 36, and a spring attempts to push the piston 36 into the elastic chamber 37 in the direction of the ball 42 as a locking element on the right in the figure. The locking piston 36 forms the limit of a locking pressurization chamber 38 inside the cylinder head, which is connected to the working chamber via a through hole 39 (not shown in FIG. 9), The working pressure is applied. A pressure medium can be supplied or evacuated under working pressure through a valve through a further hole 40 (also not shown in FIG. 9) in the locking pressurization chamber and the working chamber. The pressure medium is also preferably compressed air in this case.
Further, the locking piston 36 covers the ball 42 when the ball 42 is fitted into the annular groove 43 provided in the piston rod on the inner end face (see FIG. 7) or the ball moves into the annular groove when the piston rod 32 moves. A sleeve-like portion 41 is provided which is suitable for releasing the ball 42 so that it can be pushed out of 43 and moved radially outwardly in the locking pressure chamber 38 (see FIG. 9).
Specifically, in FIG. 7, when the locking pressurization chamber is evacuated and the working chamber 33 is also evacuated and the piston is moved to the left position to open the smoke exhaust valve, the annular groove 43 is In this state, it is located under the sleeve-like portion 41 of the locking piston that is moving to the right, whereby the ball 42 is fitted into the annular groove 43 and restrains the piston rod 32.
On the other hand, in the operating state shown in FIG. 9 in which compressed air flows into the locking pressurizing chamber 38 and the operating chamber 33 under the operating pressure, the locking piston is moved to the left against the spring force, and the ball 42 is moved in the radial direction. The piston rod 32 is retracted outwardly and disengaged from the annular groove 43, so that the piston rod 32 is no longer restrained and is moved to the right position corresponding to the closed position of the smoke exhaust valve by the piston.
In the fourth embodiment, the control is performed by the three-way / two-way thermo valve 44. The thermo valve 44 automatically exhausts the locking pressurization chamber 38 and the working chamber 33 when the temperature rises to a predetermined limit value or more. The thermo valve 44 can optionally be connected to a separate three-way / two-way valve 45, which can be operated manually or electromagnetically (as a solenoid valve), for example. The three-way valve / 2-way valve 45 is further connected to a compressed air source.
FIG. 8 shows a cross section of the thermo valve 44. Since the thermo valve 44 has a conventional structure, a detailed description thereof will be omitted. The thermo valve 44 is connected to a separate hole 40 leading to the locking pressurization chamber 38 as suggested in FIG.
A compressed air cylinder 45 as a fifth preferred embodiment shown in FIGS. 10 to 12 is equivalent to the fourth embodiment shown in FIG. 7 in the left end portion having a terminal position locking device 46 and a thermo valve 47. The piston 48 partly corresponds to the second embodiment shown in FIG. However, in the present embodiment, unlike the second embodiment, a second slide valve 50 that forms a check valve 50 in the axial direction of the piston 48 inside the single hole 49 is different from the second embodiment. The first slide valve 51 is arranged in series. The slide valves 50 and 51 are rubber molded products, and annular seal beads 52 and 53 are formed on the front surfaces thereof. The seal beads 52 and 53 perform a good seal in cooperation with the flat surface on which they are pressed.
In the present embodiment, the second slide valve 50 replaces the ball of the pre-adjustable check valve 20 shown in FIGS. The seal bead 53 of the second slide valve 50 acts by a spring force of a coil spring (not shown) that presses the first slide valve 51 and the second slide valve 50 in the opposite directions while supporting the flanges 58 and 59. Below, a flat ring-shaped front surface 54 of the insert 55 having a through hole 56 communicating with the working chamber 57 is pressed and sealed.
The first slide valve 51 is actuated by the thrust bar 63 when the thrust bar 63 comes into contact with a stopper 64 provided on the cylinder bottom 65.
The cylinder bottom 65 has a high-pressure limiting valve 66, and the high-pressure limiting valve 66 is connected to a cylinder space 68 that is basically separated from the working chamber 57 through a hole 67. Regarding the function of the high-pressure limiting valve 66, refer to the first embodiment again.
The functions of the end position locking device 46 and the thermo valve 47 connected to the locking pressurization chamber 70 through a hole have been described in relation to the same working elements of the fourth embodiment. FIGS. 10 and 11 do not show the ball 42 that cooperates with the sleeve-like portion 41 shown in FIGS. 7 and 9. When compressed air is applied to the locking pressurizing chamber 70 and the working chamber 57 through the three-way valve to which the thermo valve 47 is connected under the working pressure, the piston rod 71 is unlocked and the piston 48 is moved as shown in FIG. As shown in FIG. 4, the stopper 64 is brought into pressure contact. As a result, the first slide valve 51 that is actuated via the thrust bar 63 is opened, and the first slide valve 51 disposed in the piston 48 between the actuating chamber 57 and the cylinder space 68 is limited to the differential pressure limit. The flow channel via the second slide valve 50 acting as a vessel is opened until the differential pressure between the working chamber 57 and the cylinder space 68 reaches a value preset in the second slide valve 50. The
When the working chamber 57 and the locking pressurizing chamber 70 are exhausted, the piston 48 is slid to the left by the pressure in the cylinder space 68, and the smoke exhaust valve connected to the piston rod 71 is opened. During the movement, the second slide valve 50 and the first slide valve 51 are both sealed (see FIG. 12). The second slide valve 50 has the same function as the adjustable check valve 20 of the second embodiment.
The compressed air cylinder 72 as the sixth embodiment shown in FIG. 13 is basically the same as the fifth embodiment in that an external pressure accumulating chamber 73 connected to the cylinder bottom 75 via a pipe 74 is provided. It is different. The external pressure accumulating chamber 73 is connected to the cylinder space 78 through the holes 76 and 77, and the volume of the cylinder space 78 when the piston 48 is in the illustrated position does not have a stopper protruding from the shilling bottom 75. Since the working surface of the piston 48 is in pressure contact with the front surface of the cylinder bottom 75, it is substantially zero. Thus, the entire volume in the cylinder 72 limited by the piston 48 can be utilized as the working chamber 79, while the external accumulator chamber 73 can be provided spatially separated from the compressed air cylinder 72. As a result, the operation stroke between the piston 48 and the piston rod 80 is maximized.
[Brief description of the drawings]
FIG. 1 is a view showing a longitudinal section of a first embodiment including a pressure medium suction device and a high-pressure limiting valve when a smoke exhaust valve (not shown) connected to a piston rod is in an open position. .
FIG. 2 is a view showing a longitudinal section of the first embodiment in a position corresponding to the closed position of the smoke exhaust valve.
FIG. 3 is a view showing a longitudinal section of a second embodiment including a pressure medium replenishing device and a high-pressure limiting valve at a position corresponding to an open position of a smoke exhaust valve not shown.
FIG. 4 is a view showing a longitudinal section of a second embodiment in a position corresponding to the closed position of the smoke exhaust valve.
FIG. 5 is similar to the second embodiment in a position corresponding to the open position of the smoke exhaust valve not shown, but with a partial accumulator chamber arranged as an annular chamber around the cylinder; It is a figure which shows the longitudinal cross-section of a 3rd Example.
6 is a view showing a longitudinal section of the third embodiment shown in FIG. 5 in a position corresponding to the closed position of the smoke exhaust valve.
FIG. 7 is similar to the first embodiment, but with a non-illustrated smoke exhaust valve connected to the piston rod in the open position, but also a thermo-valve and optionally operable 3-way / 2-way valve And a longitudinal section of a fourth embodiment provided with a terminal position locking device.
FIG. 8 is a cross-sectional view of the fourth embodiment shown in FIG.
FIG. 9 is a view showing a longitudinal section of a fourth embodiment in which a thermo valve and other three-way / two-way valves are omitted in the position corresponding to the closed position of the smoke exhaust valve.
FIG. 10 is a view showing a longitudinal section of a fifth embodiment including a thermo valve and a smoke exhaust valve end position locking device (not shown) in a position corresponding to the closed position of the smoke exhaust valve.
11 is a diagram showing details of the fifth embodiment, that is, details of the piston in the position shown in FIG.
FIG. 12 is a diagram showing details of the piston shown in FIG. 11 in an intermediate position between both positions corresponding to the closed position and the open position of the smoke exhaust valve.
13 is a view similar to the fifth embodiment shown in FIG. 10, but showing a longitudinal section of a sixth embodiment with an independent compressed air tank.

Claims (11)

At least one working surface (6, 31) slidable by compressed air in a cylinder (1, 24, 29, 45, 72) having at least one working chamber (4, 33, 57, 79); The pistons (2, 16, 30, 48) acting on both sides, the piston rod (3) connected to the smoke exhaust valve, and the control device controlling in its first function acting on the working surface Adjustable elements, in particular adjustable elements, with an energy accumulator with adjusting means that keeps the flue gas valve activated or activated, in particular open. In a compressed air cylinder for operating a smoke exhaust valve of a smoke / exhaust heat facility, air as a compressible pressure medium or a pressure accumulation chamber for accumulating compressed air is provided as an energy accumulator. The pressure accumulating chamber is connected to the compression surface (7, 18) opposite to the operating surface (6, 31) of the piston (2, 16, 30, 48) via a pressure medium, and the control device has its second function. In the operation chamber (4, 33, 57, 79) and an exhaust valve connected to the operation chamber and to which the operation pressure is applied , the stopper (8, 22, 64) is operated in the operation chamber (4). In the cylinder space (5, 25, 68) separated from the cylinder), the stopper restricts the movement of the piston into the cylinder space (5, 25, 68) and the working chamber (4, 57). The cylinder space (5, 25, 68) is connected via a flow channel provided with a mechanically controlled differential pressure limiter and is operated by a stopper in the cylinder space. And a check valve (20) as a differential pressure limiter are disposed in the piston (16, 48), the slide valve abuts against a stopper, the operating chamber, the cylinder space, The flow channel in the piston (16, 48) between the cylinder space and the working chamber is opened when the differential pressure between the cylinder space and the check valve reaches a preset value. compressed air cylinder, characterized in that it is. The accumulator chamber is entirely formed by a sealed cylinder space (5), which is in the cylinder (1, 29, 45) by the piston (2, 16, 30, 48) and the working chamber (4, 33). 2. A compressed air cylinder according to claim 1, which is separated from the compressed air cylinder. A cylinder space (25) separated from the working chamber (4) by a piston (16, 48) in the cylinder (24, 72) forms part of the pressure accumulating chamber, the cylinder space (25) and its partial pressure accumulating. The compressed air cylinder according to claim 1, wherein the chambers are connected via a flow channel (hole 27). A compressed air cylinder according to claim 3, wherein the annular chamber (26) is arranged as a partial accumulator chamber around the cylinder (24). A check valve is formed as a second slide valve (50), and a first slide valve (51) having a second slide valve (50) as well as a protruding thrust bar (63) is disposed in the piston (48). The common hole (49) is coaxially arranged in series and supported, and the nest (55) is inserted into one end of the hole so that the first slide valve (51) and the second slide valve (50 The compressed air cylinder according to any one of claims 1 to 4, wherein the compressed air cylinder is pressed toward the outer sealing surface (54) by a coil spring disposed between them . The first slide valve (51) and the second slide valve (50) are each formed as a rubber molded product having seal beads (52, 53) formed in an annular shape on the outer front surface. Compressed air cylinder as described . 8. The valve according to claim 1, wherein the valve is connected to the valve so that the piston of the compressed air cylinder is moved in the direction of the working chamber by the valve beyond the predetermined opening angle when the smoke exhaust valve is opened. A compressed air cylinder according to claim 1, wherein the pressure medium replenishing device is formed in the cylinder bottom (9) or cylinder wall as a pressure medium suction device in the form of a low pressure valve (10) and is separated from the working chamber (4) The compressed air cylinder according to any one of claims 1 to 6, wherein the space (5) is connected to outside air via the low-pressure valve . A cylinder space (5, 25, 68, 78) separated from the working chamber (4) is connected to the outside air via a cylinder bottom (9, 65, 75) or a high pressure limiting valve (12, 66) arranged on the cylinder wall. The compressed air cylinder as described in any one of Claims 1 thru | or 7 connected . The piston rod (32, 71, 80) is locked by the at least one terminal position locking device (35) in a position pushed by the pressure in the pressure accumulating chamber when the working chamber (33, 57, 79) is evacuated. The compressed air cylinder according to any one of claims 1 to 8 . The compressed air cylinder according to claim 9, wherein a piston rod double-sided termination position locking device is arranged . The compressed air cylinder according to any one of claims 1 to 10, wherein the pressure accumulation chamber is prefilled with air .

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