JP5327143B2 - Check valve - Google Patents

Description

  The present invention relates to a check valve provided in a pipe for circulating a gas whose temperature is below freezing.

  In recent years, high-pressure dehumidification air cycle systems capable of obtaining a large cooling capacity with a small supply air flow rate by achieving high dehumidification efficiency have been widely used in aircraft air conditioners. In this high-pressure dehumidification air cycle system, the outlet temperature often reaches below freezing point, so that it is adjusted to an appropriate temperature to be supplied into the aircraft through a mixing chamber that mixes with hot trim air and recirculation air in the aircraft. (For example, see Patent Document 1).

  On the other hand, the relative humidity at the outlet of the high-pressure dehumidifying air cycle system may exceed 100%, and the temperature is below freezing point, so ice may be generated in the piping upstream of the temperature control unit.

  Here, in the case where a check valve for preventing the backflow of air from inside the machine is provided in the pipe, if ice generated in the pipe adheres to the valve body of the check valve, the pressure loss is reduced. Problems such as an increase, performance degradation of the air cycle system, and a shortage of air supplied to the aircraft may occur.

  As means for coping with this problem, conventionally, a method of blowing hot air to the check valve or a method of melting the ice by heating the check valve with an electric heater or the like is known. In the method, since the air passing through the check valve is also heated, there arises another problem that the cooling capacity is lowered.

  In order to avoid the above-mentioned problem of reduced cooling capacity, a separate icing detection device such as a differential pressure sensor or a differential pressure switch for detecting the adhesion of ice is provided, and this icing detection device detects the adhesion of ice. In such a case, a method of opening a valve provided in a pipe for blowing high-temperature air or supplying electric power to an electric heater can be considered. However, there is another problem in that it becomes complicated and the weight increases.

  The above-mentioned problems commonly occur in all check valves in piping in which a gas having a freezing point and a relative humidity exceeding 100% flows in an air conditioner.

JP 2004-90778 A

  The present invention focuses on the above points and aims to solve the problem of suppressing an increase in pressure loss without greatly reducing the cooling capacity and without complicating the mechanism. To do.

  That is, the check valve according to the present invention includes a housing that internally forms a main flow path for flowing gas in a certain direction, a valve mechanism that is disposed in the housing to open and close the main flow path, and a valve mechanism in the vicinity of the valve mechanism. Ice accretion detection having a high-temperature gas flow path for inflowing high-temperature gas and a port provided near the pressure chamber and the valve mechanism and opening toward the upstream side of the main flow path to guide the gas in the main flow path to the pressure chamber. Using the differential pressure between the mechanism and the pressure in the pressure chamber and the external pressure, when the icing detection mechanism detects icing, it takes an open state in which hot gas can be introduced from the hot gas channel, and in other cases And a control valve in a shut-off state for shutting off high-temperature gas.

  In such a configuration, the control valve control mechanism operates only when icing near the valve body, so that the control valve is opened and high-temperature gas is introduced in the vicinity of the valve mechanism to melt the ice. In this case, the control valve is shut off and the high temperature gas is not introduced near the valve mechanism of the main flow path. Therefore, an increase in pressure loss or the like can be suppressed by a simple mechanism without greatly reducing the cooling capacity.

  According to the configuration of the check valve of the present invention, it is possible to suppress an increase in pressure loss and the like without greatly reducing the cooling capacity and without causing a complicated mechanism.

The figure which shows schematically the non-return valve which concerns on one Embodiment of this invention. AA sectional drawing in FIG.

  An embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  The check valve according to the present embodiment is provided at the outlet of an aircraft air conditioner that mainly uses a high-pressure dehumidifying air cycle system.

  As shown in FIGS. 1 and 2, the check valve includes a housing 1 that internally forms a main flow path 1a through which a gas flows in a certain direction, that is, an arrow X direction in FIG. 1, and the main flow path 1a. A valve mechanism 2 disposed in the housing 1, a high-temperature gas flow path 6x for allowing a high-temperature gas to flow in the vicinity of the valve mechanism 2, a pressure chamber 7b, and the main flow path 1a provided in the vicinity of the valve mechanism 2. Using an icing detection mechanism 7 having a port 7a that opens toward the upstream side and guides the gas in the main flow path 1a into the pressure chamber 7b, and the differential pressure between the pressure in the pressure chamber 7b and the external pressure, When the ice detection mechanism 7 detects icing, the control valve 8 is in an open state in which high-temperature gas can be introduced from the high-temperature gas flow path 6, and in other cases, the control valve 8 is in a shut-off state that shuts off the high-temperature gas.

  More specifically, as shown in FIG. 1, the housing 1 is provided in an air supply line that supplies air from an air conditioner for an aircraft to a pressurized chamber such as a cabin.

  As shown in FIGS. 1 and 2, the valve mechanism 2 includes an open position O that connects the upstream side and the downstream side of the air supply line around the shaft 4 provided in the housing 1, the housing and the support column. The valve body 3 is rotatably provided between a shielding position S that shields the upstream side and the downstream side of the air supply line in contact with the air supply line, and a part of the valve body 3 is housed in the housing 1. And a support column 5 that is a valve seat that abuts the valve body 3 positioned at the center. Here, the valve body 3 is provided apart from the housing 1 and the support column 5. Here, the valve body 3 is urged toward the shield position S by a torsion coil spring (not shown), and resists the urging force when receiving pressure derived from the flow of gas from upstream to downstream. Move toward the open position O.

  The icing detection mechanism 7 is provided inside the column 5. As described above and as shown in FIGS. 1 and 2, the icing detection mechanism 7 opens toward the upstream side of the pressure chamber 7b and the main flow path 1a, and allows the gas in the main flow path 1a to flow into the pressure chamber. 7b leading into 7b. The pressure chamber 7b includes the high-temperature gas flow path 6x, a first high-temperature gas supply path 6a for introducing a high-temperature gas into the valve body 2, and a second high-temperature gas for introducing a high-temperature gas in the vicinity of the port 7a. It also communicates with the supply path 6b.

  As shown in FIG. 1, the control valve 8 is provided in the pressure chamber 7b and is capable of introducing a high temperature gas from the high temperature gas flow path 6x, that is, the high temperature gas flow path 6x and the first and second. An open state in which the high-temperature gas supply paths 6a and 6b communicate with each other, and a state in which the high-temperature gas is blocked, that is, a block between the high-temperature gas flow path 6x and the first and second high-temperature gas supply paths 6a and 6b. It is possible to switch between states. More specifically, the control valve 8 includes a first slide 91 provided on the port 7a side, a first slide 91 provided on the opposite side of the port 7a from the first slide 91, and first and second high temperatures. A second slide 92 movable between a blocking position SS for closing the gas supply paths 6a, 6b and an open position OO for opening the first and second high-temperature gas supply paths 6a, 6b, and the second slide 92; This is a spool valve in which a spool 9 as a valve body integrally having a third slide 93 provided to be separated from the slide 7 on the opposite side to the port 7a is formed to be slidable in the pressure chamber 7b. The first slide 91 is provided with a communication path 91a that communicates the port 7a side and the opposite side. The spool 9 is biased by the compression coil spring SP toward the port 7a side, that is, the side where the second slide 92 becomes the open position OO. In the pressure chamber 7b, a plurality of spool support protrusions 7b1 are provided inward from the inner wall so as to restrict the movement of the spool 9 beyond the position where the second slide 92 becomes the open position OO. ing. In FIG. 1, the state in which the second slide 92 takes the blocking position SS is shown by an imaginary line, and the state in which the second slide 92 takes the open position OO is shown by a solid line.

  Specifically, when the valve body 3 and the support column 4 are not icing and there is an air flow in the main flow path 1a, the main flow path 1a passes through the port 7a and enters the pressure chamber 7b. This air flow is introduced. At this time, the total pressure derived from the air flow becomes larger than the surrounding pressure, and the force received by the spool 9 due to the total pressure exceeds the spring force of the compression coil spring SP. Accordingly, the spool 9 moves in a direction away from the port 7a against the spring force, and the second slide 92 takes the blocking position SS. At this time, the high temperature air supply path 6x and the main flow path 1a are blocked, and the high temperature air is not introduced into the main flow path 1a.

  On the other hand, when the icing on the valve body 3 and the support column 4, the port 7 a is closed by the ice, so that the air flow in the main flow path 1 a is not introduced into the pressure chamber 7 b. At this time, the pressure in the pressure chamber 7b becomes equal to the surrounding pressure, and the spool 9 moves to the port 7a side under the spring force of the compression coil spring SP. Then, the spool 9 hits the spool support protrusion 7b1. Then, the second slide 92 takes the open position OO, and the high temperature air supply path 6x and the first and second high temperature gas supply paths 6a and 6b communicate with each other. In response to this, high-temperature air is injected toward the valve body 3 and the port 7a in the housing 1 in order to melt the icing ice.

  When the ice adhering to the port 7a is melted in the state where the air flow is present in the main flow path 1a, the air flow is again introduced into the pressure chamber 7b from the main flow path 1a through the port 7a. Therefore, the spool 9 moves against the spring force of the compression coil spring SP until the second slide 92 takes the blocking position SS, and the high-temperature air supply path 6x and the main flow path 1a are blocked again.

  In addition, in a state where there is no air flow in the main flow path 1a, the high temperature air does not reach the main flow path 1a because the high temperature air is not introduced into the high temperature air supply path 6x.

  As described above, according to the configuration of the check valve according to the present embodiment, the spool 9 is the compression coil spring only when the port 7a is iced in the state where the air flow exists in the main flow path 1a. Only the spring force from the SP is received, the second slide takes the open position OO, the high temperature air supply path 6x and the first and second high temperature gas supply paths 6a and 6b communicate with each other, and ice Hot air is supplied toward the valve body 3 and the port 7a to melt the air. On the other hand, when there is an air flow in the main flow path 1a and the port 7a is not icing, the air flow in the main flow path 1a is introduced into the pressure chamber 7b through the port 7a, and the spool 9 is When the total pressure received exceeds the spring force received from the compression coil spring SP, the spool 9 moves in a direction away from the port 7a, the second slide 92 takes the blocking position SS, and the high temperature air supply path 6x and the first and The second hot gas supply paths 6a and 6b are disconnected. That is, when the icing detection mechanism does not detect icing, the high temperature air supply path 6x and the main flow path 1a are blocked. Accordingly, it is possible to suppress the occurrence of problems such as an increase in pressure loss due to the adhesion of ice to the valve body 3 and the support column 4 without greatly reducing the cooling capacity.

  The present invention is not limited to the embodiment described above.

  For example, the configuration of the present invention may be adopted in a check valve provided in an air cycle system and provided in a bypass passage in which a gas below freezing point may flow.

  Further, instead of providing a compression coil spring, for example, when ice adheres to the port, the valve body moves vertically downward by its own weight so that high temperature air from the high temperature air flow path is supplied to the vicinity of the valve mechanism, In other cases, a mode may be adopted in which the valve body is pushed up by the flow of air supplied to the pressure chamber via the port to block the high-temperature air from the high-temperature air flow path. In this case, the upper end of the valve body is connected to the valve seat or the like by means of fall prevention means such as a string, and when the valve body moves vertically downward by its own weight, the valve body may be held at a predetermined lower end position by the string. .

  In addition, as long as it is in the valve mechanism or in the vicinity of the valve mechanism, the icing detection mechanism and the control valve may be provided not only in the column as the valve seat but also in other places.

  In addition, various modifications may be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Housing 1a ... Main flow path 2 ... Valve mechanism 6 ... High temperature gas flow path 7 ... Icing detection mechanism 7a ... Port 7b ... Pressure chamber 8 ... Control valve

Claims (1)

A housing that internally forms a main flow path that allows gas to flow in a certain direction, a valve mechanism that is disposed in the housing to open and close the main flow path, and a high-temperature gas flow that flows in the vicinity of the valve mechanism An icing detection mechanism having a port, a pressure chamber, and a port provided in the vicinity of the valve mechanism and opening toward the upstream side of the main flow path to guide the gas in the main flow path to the pressure chamber; Control that uses the pressure difference from the pressure to open the state where high temperature gas can be introduced from the high temperature gas flow path when the icing detection mechanism detects icing, and to block the high temperature gas in other cases And a check valve.

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