CA2359773A1 - Pressure control valve and a compressed air dehumidification device that uses this - Google Patents
Pressure control valve and a compressed air dehumidification device that uses this Download PDFInfo
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- CA2359773A1 CA2359773A1 CA002359773A CA2359773A CA2359773A1 CA 2359773 A1 CA2359773 A1 CA 2359773A1 CA 002359773 A CA002359773 A CA 002359773A CA 2359773 A CA2359773 A CA 2359773A CA 2359773 A1 CA2359773 A1 CA 2359773A1
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- valve
- pressure
- valve body
- compressed air
- pressure control
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/04—Control of fluid pressure without auxiliary power
- G05D16/10—Control of fluid pressure without auxiliary power the sensing element being a piston or plunger
Abstract
To supply a pressure control valve and a compressed air dehumidification device that uses it which make it possible to aim at the improvement of dehumidification efficiency while holding in check the increase in the number of component parts. A
pressure control valve possessing (a) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (b) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (c) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (d) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact;
and (e) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
pressure control valve possessing (a) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (b) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (c) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (d) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact;
and (e) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
Description
A PRESSURE CONTROL VALVE AND A COMPRESSED AIR
DEHUMIDIFICATION DEVICE THAT USES THIS
The present invention relates to a compressed air dehumidification device built into a compressed air source device for the purpose of supplying compressed air to such pneumatic machines as the breaking devices of railway cars and automatic door opening equipment, as well as to the pressure control valve contained in this dehumidification device.
Prior Art Previously, the item shown in Figure 7 was for example known of as a compressed air source device supplying compressed air to such pneumatic machines as the breaking devices of railway cars, etc. (refer to Utility Model Gazette S62-45107 ( 1987)). This device has been configured such that the compressed air is supplied from an air compressor (1 ) to an original air tank (5) through the medium of an aftercooler (2), a dehumidification device 1 S (3) and a check valve (4), and then the compressed air is sent from the original air tank (5) to said pneumatic machines (not shown in the figure). A pressure regulator (6) has been provided at the exit side of the original air tank (5).
In the dehumidification device (3), an adsorption/regeneration type dehumidifier (7) containing an adsorbent necessary for drying and regeneration treatment at each fixed time interval, a check valve (8) that allows only circulation in the direction of the original air tank (5), a pressure control valve (9) and a regenerated air tank (10) are connected serially between the aftercooler (2) and the check valve (4), and in addition a check valve (11) that allows only circulation in the direction that returns to the dehumidifier (7) side and a restrictor (12) have been connected. Moreover, a discharge valve (13) has been connected to the entrance side of the dehumidifier (7).
In general there is a tendency for the dehumidification function of the dehumidifier (7) to decline since the amount of saturated moisture in the air becomes greater in the case of the pneumatic low-pressure region than in the high-pressure region, so in the case of the dehumidification device (3) the circulation of compressed air from the dehumidifier (7) in the direction of the original air tank (5) by means of the pressure control valve (9) is being blocked until the pressure of the compressed air supplied from the air compressor ( 1 ) attains the prescribed value in a state wherein the discharge valve (13) is closed.
Then, when the pressure of the compressed air supplied from said air compressor ( 1 ) attains the prescribed value, the pressure control valve opens and compressed air is supplied to both the regenerated air tank ( 10) and the original air tank (5), and due to this the pressure inside both the regenerated air tank (10) and the original air tank (5) gradually rises. After that, when the pressure of the compressed air inside the original air tank (5) attains the prescribed upper limit value, the pressure regulator (6) begins to operate and the air compressor (1) is stopped, and simultaneous with this the discharge valve (13) is opened, and owing to this the regeneration of the humidifier (7) is performed as follows.
In other words, when the air compressor (1) stops, the back flow of compressed air from the original air tank (5) in the direction of the regenerated air tank (10) is prevented by the check valve (4), but during this time compressed air flows back gradually from the regenerated air tank (10) to the dehumidifier (7) side through the medium of the restrictor ( 12) and the check valve ( 11 ), and it is then discharged from the discharge valve ( 13) through the medium of the dehumidifier (7), and the adsorbent inside the dehumidifier is dried and regenerated.
After that, the compressed air inside the original air tank (5) is consumed by said air compressor, and owing to this the pressure inside the original air tank (5) declines to the lower limit value. When this happens, the pressure regulator (6) begins to operate and the discharge valve (13) is closed, and at the same time the air compressor (1) begins to operate again, such that the compressed air is supplied to the regenerated air tank (10) and the original air tank (S) through the medium of the pressure control valve (9), etc. by the same steps as described above. Subsequently the pressure inside the original air tank (5) is controlled such that it falls within the range of the above-mentioned upper limit value and lower limit value.
Summary of the Invention However, in said dehumidification device, attempts have been made to rationalize the regeneration action of the dehumidifier (7) so that after the air compressor ( 1 ) has stopped a fixed time lag until the control valve (9) closes occurs, so immediately after the closing of the air compressor (1) the back flow of the compressed air through the medium of the pressure control valve (9) is prevented, and the compressed air inside the regenerated air tank ( 10) flows through only the restrictor ( 12) and the check valve ( 11 ) to the dehumidifier (7) at an appropriate speed. However, in the above-mentioned composition the inconvenience arises that the pressure control valve (9) and the check valve (8) have been provided separately and as a result the number of component parts increases.
The present invention takes as its purpose the provision of a pressure control valve and a compressed air dehumidification device that employs this that solve the above-mentioned problem and whereby it becomes possible to aim at an improvement of the dehumidification efficiency while holding in check the increase in the number of component parts.
For this reason, the pressure control valve of the present invention possesses (a) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (b) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (c) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (d) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (e) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
Due to this, by building into the pressure control valve said valve body, which is equivalent to the check valve that was provided separately from the pressure control value in the conventional device, it becomes possible to hold in check the increase of the number of component parts while reliably preventing by means of said valve body the back flow of compressed air that passes through the pressure control valve immediately after the compressed air source stops its operation.
DEHUMIDIFICATION DEVICE THAT USES THIS
The present invention relates to a compressed air dehumidification device built into a compressed air source device for the purpose of supplying compressed air to such pneumatic machines as the breaking devices of railway cars and automatic door opening equipment, as well as to the pressure control valve contained in this dehumidification device.
Prior Art Previously, the item shown in Figure 7 was for example known of as a compressed air source device supplying compressed air to such pneumatic machines as the breaking devices of railway cars, etc. (refer to Utility Model Gazette S62-45107 ( 1987)). This device has been configured such that the compressed air is supplied from an air compressor (1 ) to an original air tank (5) through the medium of an aftercooler (2), a dehumidification device 1 S (3) and a check valve (4), and then the compressed air is sent from the original air tank (5) to said pneumatic machines (not shown in the figure). A pressure regulator (6) has been provided at the exit side of the original air tank (5).
In the dehumidification device (3), an adsorption/regeneration type dehumidifier (7) containing an adsorbent necessary for drying and regeneration treatment at each fixed time interval, a check valve (8) that allows only circulation in the direction of the original air tank (5), a pressure control valve (9) and a regenerated air tank (10) are connected serially between the aftercooler (2) and the check valve (4), and in addition a check valve (11) that allows only circulation in the direction that returns to the dehumidifier (7) side and a restrictor (12) have been connected. Moreover, a discharge valve (13) has been connected to the entrance side of the dehumidifier (7).
In general there is a tendency for the dehumidification function of the dehumidifier (7) to decline since the amount of saturated moisture in the air becomes greater in the case of the pneumatic low-pressure region than in the high-pressure region, so in the case of the dehumidification device (3) the circulation of compressed air from the dehumidifier (7) in the direction of the original air tank (5) by means of the pressure control valve (9) is being blocked until the pressure of the compressed air supplied from the air compressor ( 1 ) attains the prescribed value in a state wherein the discharge valve (13) is closed.
Then, when the pressure of the compressed air supplied from said air compressor ( 1 ) attains the prescribed value, the pressure control valve opens and compressed air is supplied to both the regenerated air tank ( 10) and the original air tank (5), and due to this the pressure inside both the regenerated air tank (10) and the original air tank (5) gradually rises. After that, when the pressure of the compressed air inside the original air tank (5) attains the prescribed upper limit value, the pressure regulator (6) begins to operate and the air compressor (1) is stopped, and simultaneous with this the discharge valve (13) is opened, and owing to this the regeneration of the humidifier (7) is performed as follows.
In other words, when the air compressor (1) stops, the back flow of compressed air from the original air tank (5) in the direction of the regenerated air tank (10) is prevented by the check valve (4), but during this time compressed air flows back gradually from the regenerated air tank (10) to the dehumidifier (7) side through the medium of the restrictor ( 12) and the check valve ( 11 ), and it is then discharged from the discharge valve ( 13) through the medium of the dehumidifier (7), and the adsorbent inside the dehumidifier is dried and regenerated.
After that, the compressed air inside the original air tank (5) is consumed by said air compressor, and owing to this the pressure inside the original air tank (5) declines to the lower limit value. When this happens, the pressure regulator (6) begins to operate and the discharge valve (13) is closed, and at the same time the air compressor (1) begins to operate again, such that the compressed air is supplied to the regenerated air tank (10) and the original air tank (S) through the medium of the pressure control valve (9), etc. by the same steps as described above. Subsequently the pressure inside the original air tank (5) is controlled such that it falls within the range of the above-mentioned upper limit value and lower limit value.
Summary of the Invention However, in said dehumidification device, attempts have been made to rationalize the regeneration action of the dehumidifier (7) so that after the air compressor ( 1 ) has stopped a fixed time lag until the control valve (9) closes occurs, so immediately after the closing of the air compressor (1) the back flow of the compressed air through the medium of the pressure control valve (9) is prevented, and the compressed air inside the regenerated air tank ( 10) flows through only the restrictor ( 12) and the check valve ( 11 ) to the dehumidifier (7) at an appropriate speed. However, in the above-mentioned composition the inconvenience arises that the pressure control valve (9) and the check valve (8) have been provided separately and as a result the number of component parts increases.
The present invention takes as its purpose the provision of a pressure control valve and a compressed air dehumidification device that employs this that solve the above-mentioned problem and whereby it becomes possible to aim at an improvement of the dehumidification efficiency while holding in check the increase in the number of component parts.
For this reason, the pressure control valve of the present invention possesses (a) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (b) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (c) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (d) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (e) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
Due to this, by building into the pressure control valve said valve body, which is equivalent to the check valve that was provided separately from the pressure control value in the conventional device, it becomes possible to hold in check the increase of the number of component parts while reliably preventing by means of said valve body the back flow of compressed air that passes through the pressure control valve immediately after the compressed air source stops its operation.
The pressure control valve supports said valve for setting the opening pressure by means of a spring receiving element provided such that it can adjust its position relative to said valve unit in the composition recorded in Claim 1. Owing to this, the opening pressure of said valve body, that is, the pressure that initiates the supply of compressed air to the air compressor that is the destination of the supply of compressed air from this pressure control valve, can be regulated by regulation of the position of said spring receiving element.
The pressure control valve may possess a configuration wherein the piston body is annular, and said spring receiving element possesses a shaft-shaped part that guides the sliding by contact of said piston body from the inner side by passing the piston completely through it in the composition recorded in Claim 2. Due to this, it becomes possible to guide the sliding by contact of the piston body with a simple composition and moreover with small number of parts.
The invention also relates to a compressed air dehumidification device employing the pressure control valve wherein:
(a) it is a compressed air dehumidification device provided between the compressed air source and the air tank;
(b) it is equipped with (i) a dehumidifier that dehumidifies the compressed air from said compressed air source; and (ii) a pressure control valve that is provided between this dehumidifier and said air tank, and that opens the valve when the pressure on the dehumidifier side has attained a prescribed pressure; and (c) it possesses (i) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (ii) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (iii) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (iv) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (v) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction. Owing to this, it becomes possible to improve the dehumidification efficiency just as in the above-mentioned Claim 1, and in addition there is the advantage that it is possible to hold in check the increase of the number of parts.
The compressed air dehumidification device employing the pressure control valve is something wherein said dehumidifier has been made into an adsorption and regeneration type dehumidifier. In this way, the check valve provided separately from the pressure control valve in the conventional device becomes unnecessary and it is possible to hold in check the increase of the number of parts by providing said pressure control valve between the adsorption/regeneration type dehumidifier and the regenerated air tank.
The compressed air dehumidification device employing the pressure control valve is something wherein said dehumidifier has been made into a hollow-fiber membrane type dehumidifier. In this way, it becomes possible to aim at the simplification and the miniaturization of the structure compared to the adsorption/regeneration type dehumidifier by employing a hollow-fiber membrane type dehumidifier, and in addition it becomes possible to aim at a reduction of the number of parts and a reduction of maintenance by omitting the check valve that is a valve separate from the pressure control valve.
Brief Description of the Drawings Figure 1 is an explanatory figure showing the compressed air source device for the mode of the first embodiment of the present invention.
Figure 2 is a summary cross section diagram showing the pressure control valve included in said compressed air source device.
Figure 3 is a summary cross section diagram showing a state wherein the valve body and the piston body of said pressure control valve have moved upwards.
Figure 4 is a summary cross section diagram showing a state wherein only the valve body of said pressure control valve has moved downwards.
Figure 5 is an explanatory figure showing the compressed air source device for the mode of the second embodiment of the present invention.
Figure 6 is an explanatory figure showing the dehumidifier in the compressed air source device for the mode of the second embodiment.
Figure 7 is an explanatory figure showing a conventional compressed air source device.
Description of the Preferred Embodiment An explain follows below of the mode of the first embodiment of the present invention based on figures. As shown in Figure 1, the compressed air source device for the mode of this embodiment for the purpose of supplying compressed air to the air compressor of such things as the breaking devices of railway cars and automatic door opening equipment possesses a configuration that is basically the same as that of the conventional example in Figure 7, and as such all of the explanation that overlaps with this as concerns the reference numbers that are identical with the same constituent elements as in said conventional example will be omitted here.
The dehumidification device (20) included in the compressed air source device of the mode of this embodiment also employs an adsorption/regeneration dehumidifier (7), and thus shares basically the same composition as the dehumidification device in the above-mentioned conventional example. In other words, the dehumidification device (20) is provided between a dehumidifier (7) that dehumidifies the compressed air from an air compressor (1) (the compressed air source), and is equipped with a pressure control valve (21 ) that opens when the pressure on the dehumidifier (7) side attains the prescribed value, but it differs from the above-mentioned conventional example in that this pressure control valve (21 ) has built into it in one piece a valve body (32) possessing the function of the conventional check valve (8).
An explanation follows of the internal structure of this pressure control valve (21 ).
As shown in Figure 2, the pressure control valve (21 ) is equipped with a main case (22) that forms a portion of the valve unit, and on this main case (22) connection openings to the primary side and the secondary side, whereon each of the tapered female screws (23a, 23b), whereby the region around the tip of each pipe of the primary side and the secondary side (not shown in the figure) have been screwed in, have been formed, have been provided in positions corresponding to both side parts. The configuration is such that while the connection opening on the primary side (23) is connected to the exit side of the dehumidifier (7) in Figure 1 through the medium of a pipe that is not shown in the diagram, the connection opening on the secondary side (24) is connected to a regenerated air tank (10).
A cylindrical valve seat (26) has been mated and fixed on the linkage opening (25) of the primary side and secondary side provided in a vertical direction in the figure on the central part of the main case (22). On the upper side of the valve seat (22), a round screw hole (27) has been formed on the main case (22) concentrically with the linkage opening (25), and a roughly cylindrical auxiliary case (29) possessing an upper bottom part (28) has been screwed into this screw hole (27) with a male screw (29a) with a lower tip circumference. Then, a large bore flange (29b) that is in neighboring contact with the upper side of the male screw (29a) is in contact with the upper part of the main case (22), and positioning in an axial direction has been performed. The valve unit has been composed by the main case (22) and the auxiliary case (29).
Cylindrical sleeves (31 ) have been mated and fixed concentrically with the valve seat (26) on the lower part of the inside of the auxiliary case (29). Then, cylindrical abrading part portions (32b) in the valve body (32) has been mated on the inner radius of the sleeves (31) such that it can freely slide in contact with it. Multiple through holes (32c) have been formed along the peripheral direction ofthe cylindrical abrading part portions (32b).
The valve body (32) is the element that is equivalent to the check valve (8) in the conventional example, and has been built into the inside of the pressure control valve (21 ).
An annular piston body (33) has been mated such that it can freely slide in contact inside the sleeves (31 ) on the upper side of the cylindrical abrading part portions (32b). A spring receiving element (34) formed into a joggling [?] has been mated such that it can freely slide in contact with the medium-diameter part (34b) (the shaft-shaped portion) on the inner radius of the piston body (33). A nut (35) used to prevent the piston body (33) from coming offhas been screwed together on the small-diameter part (34a) of the receiving element (34) positioned on the lower side of the medium-diameter part (34b).
Ring grooves have respectively been formed on the outer radius and the inner radius of the piston body (33), and O-rings (36, 37) for the purpose of maintaining the air tightness between the piston body (33) and the sleeve (31 ) and between the piston body (33) and the spring receiving element (34) have been mated to each of said ring grooves.
A screw hole (28a) has been created on the upper bottom part (28) of the auxiliary case (29), and a screw (38) for regulating the spring tension has been screwed from the upper side into this screw hole (28a), and on the upper surface side of the upper bottom part (28) a lock nut (39) has further been screwed together with the screw (38) for regulating the spring tension. Then, the upper surface side of the spring receiving flange part (34d) of the upper tip of said spring receiving element (34) has been placed in contact with lower tip of the screw (38) for regulating the spring tension protruding inside the auxiliary case (29).
Now, (34c) is the large-diameter part positioned between the medium-diameter part (34b) on the spring receiving element (34) and the spring receiving flange part (34d).
A pair of inner and outer springs for setting the opening pressure (41, 42) have been provided by shrinkage between the spring receiving flange part (34d) and the upper surface of the piston body (33), and these apply downward force to the piston body (33). The configuration is such that the force applied by these springs for setting the opening pressure (41, 42) can be altered by turning the screw (38) for regulating the spring tension and causing said screw (38) for regulating the spring tension to move in a vertical direction relative to the auxiliary case (29).
An air hole (29c) has been formed in the vicinity of upper bottom part (28) of the auxiliary case (29), and the inside of the auxiliary case (29) has been made into an atmospheric pressure chamber. Next, an impulsion spring (43) that applies downward force to the valve body (32), that is, downward such that the valve body (32) mounts on the valve seat (26) and assumes a closed state, has been arranged between the lower surface side of the piston body (33) and the upper surface side of the valve unit (32a) of the valve body (32).
An explanation follows of the action of said pressure control valve (21 ) the dehumidification device (20) that includes this pressure control valve (21 ).
Since the pressures inside the regenerated air tank (10) and the original air tank (5) have both been kept at atmospheric pressure, and since at this time the primary side and the secondary side of the valve body (32) of the pressure control valve (21 ) have both been kept at atmospheric pressure, the valve body (32) is mounted on the valve seat (26) by means of the force applied by the springs for setting the opening pressure (41, 42).
The pressure control valve may possess a configuration wherein the piston body is annular, and said spring receiving element possesses a shaft-shaped part that guides the sliding by contact of said piston body from the inner side by passing the piston completely through it in the composition recorded in Claim 2. Due to this, it becomes possible to guide the sliding by contact of the piston body with a simple composition and moreover with small number of parts.
The invention also relates to a compressed air dehumidification device employing the pressure control valve wherein:
(a) it is a compressed air dehumidification device provided between the compressed air source and the air tank;
(b) it is equipped with (i) a dehumidifier that dehumidifies the compressed air from said compressed air source; and (ii) a pressure control valve that is provided between this dehumidifier and said air tank, and that opens the valve when the pressure on the dehumidifier side has attained a prescribed pressure; and (c) it possesses (i) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (ii) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (iii) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (iv) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (v) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction. Owing to this, it becomes possible to improve the dehumidification efficiency just as in the above-mentioned Claim 1, and in addition there is the advantage that it is possible to hold in check the increase of the number of parts.
The compressed air dehumidification device employing the pressure control valve is something wherein said dehumidifier has been made into an adsorption and regeneration type dehumidifier. In this way, the check valve provided separately from the pressure control valve in the conventional device becomes unnecessary and it is possible to hold in check the increase of the number of parts by providing said pressure control valve between the adsorption/regeneration type dehumidifier and the regenerated air tank.
The compressed air dehumidification device employing the pressure control valve is something wherein said dehumidifier has been made into a hollow-fiber membrane type dehumidifier. In this way, it becomes possible to aim at the simplification and the miniaturization of the structure compared to the adsorption/regeneration type dehumidifier by employing a hollow-fiber membrane type dehumidifier, and in addition it becomes possible to aim at a reduction of the number of parts and a reduction of maintenance by omitting the check valve that is a valve separate from the pressure control valve.
Brief Description of the Drawings Figure 1 is an explanatory figure showing the compressed air source device for the mode of the first embodiment of the present invention.
Figure 2 is a summary cross section diagram showing the pressure control valve included in said compressed air source device.
Figure 3 is a summary cross section diagram showing a state wherein the valve body and the piston body of said pressure control valve have moved upwards.
Figure 4 is a summary cross section diagram showing a state wherein only the valve body of said pressure control valve has moved downwards.
Figure 5 is an explanatory figure showing the compressed air source device for the mode of the second embodiment of the present invention.
Figure 6 is an explanatory figure showing the dehumidifier in the compressed air source device for the mode of the second embodiment.
Figure 7 is an explanatory figure showing a conventional compressed air source device.
Description of the Preferred Embodiment An explain follows below of the mode of the first embodiment of the present invention based on figures. As shown in Figure 1, the compressed air source device for the mode of this embodiment for the purpose of supplying compressed air to the air compressor of such things as the breaking devices of railway cars and automatic door opening equipment possesses a configuration that is basically the same as that of the conventional example in Figure 7, and as such all of the explanation that overlaps with this as concerns the reference numbers that are identical with the same constituent elements as in said conventional example will be omitted here.
The dehumidification device (20) included in the compressed air source device of the mode of this embodiment also employs an adsorption/regeneration dehumidifier (7), and thus shares basically the same composition as the dehumidification device in the above-mentioned conventional example. In other words, the dehumidification device (20) is provided between a dehumidifier (7) that dehumidifies the compressed air from an air compressor (1) (the compressed air source), and is equipped with a pressure control valve (21 ) that opens when the pressure on the dehumidifier (7) side attains the prescribed value, but it differs from the above-mentioned conventional example in that this pressure control valve (21 ) has built into it in one piece a valve body (32) possessing the function of the conventional check valve (8).
An explanation follows of the internal structure of this pressure control valve (21 ).
As shown in Figure 2, the pressure control valve (21 ) is equipped with a main case (22) that forms a portion of the valve unit, and on this main case (22) connection openings to the primary side and the secondary side, whereon each of the tapered female screws (23a, 23b), whereby the region around the tip of each pipe of the primary side and the secondary side (not shown in the figure) have been screwed in, have been formed, have been provided in positions corresponding to both side parts. The configuration is such that while the connection opening on the primary side (23) is connected to the exit side of the dehumidifier (7) in Figure 1 through the medium of a pipe that is not shown in the diagram, the connection opening on the secondary side (24) is connected to a regenerated air tank (10).
A cylindrical valve seat (26) has been mated and fixed on the linkage opening (25) of the primary side and secondary side provided in a vertical direction in the figure on the central part of the main case (22). On the upper side of the valve seat (22), a round screw hole (27) has been formed on the main case (22) concentrically with the linkage opening (25), and a roughly cylindrical auxiliary case (29) possessing an upper bottom part (28) has been screwed into this screw hole (27) with a male screw (29a) with a lower tip circumference. Then, a large bore flange (29b) that is in neighboring contact with the upper side of the male screw (29a) is in contact with the upper part of the main case (22), and positioning in an axial direction has been performed. The valve unit has been composed by the main case (22) and the auxiliary case (29).
Cylindrical sleeves (31 ) have been mated and fixed concentrically with the valve seat (26) on the lower part of the inside of the auxiliary case (29). Then, cylindrical abrading part portions (32b) in the valve body (32) has been mated on the inner radius of the sleeves (31) such that it can freely slide in contact with it. Multiple through holes (32c) have been formed along the peripheral direction ofthe cylindrical abrading part portions (32b).
The valve body (32) is the element that is equivalent to the check valve (8) in the conventional example, and has been built into the inside of the pressure control valve (21 ).
An annular piston body (33) has been mated such that it can freely slide in contact inside the sleeves (31 ) on the upper side of the cylindrical abrading part portions (32b). A spring receiving element (34) formed into a joggling [?] has been mated such that it can freely slide in contact with the medium-diameter part (34b) (the shaft-shaped portion) on the inner radius of the piston body (33). A nut (35) used to prevent the piston body (33) from coming offhas been screwed together on the small-diameter part (34a) of the receiving element (34) positioned on the lower side of the medium-diameter part (34b).
Ring grooves have respectively been formed on the outer radius and the inner radius of the piston body (33), and O-rings (36, 37) for the purpose of maintaining the air tightness between the piston body (33) and the sleeve (31 ) and between the piston body (33) and the spring receiving element (34) have been mated to each of said ring grooves.
A screw hole (28a) has been created on the upper bottom part (28) of the auxiliary case (29), and a screw (38) for regulating the spring tension has been screwed from the upper side into this screw hole (28a), and on the upper surface side of the upper bottom part (28) a lock nut (39) has further been screwed together with the screw (38) for regulating the spring tension. Then, the upper surface side of the spring receiving flange part (34d) of the upper tip of said spring receiving element (34) has been placed in contact with lower tip of the screw (38) for regulating the spring tension protruding inside the auxiliary case (29).
Now, (34c) is the large-diameter part positioned between the medium-diameter part (34b) on the spring receiving element (34) and the spring receiving flange part (34d).
A pair of inner and outer springs for setting the opening pressure (41, 42) have been provided by shrinkage between the spring receiving flange part (34d) and the upper surface of the piston body (33), and these apply downward force to the piston body (33). The configuration is such that the force applied by these springs for setting the opening pressure (41, 42) can be altered by turning the screw (38) for regulating the spring tension and causing said screw (38) for regulating the spring tension to move in a vertical direction relative to the auxiliary case (29).
An air hole (29c) has been formed in the vicinity of upper bottom part (28) of the auxiliary case (29), and the inside of the auxiliary case (29) has been made into an atmospheric pressure chamber. Next, an impulsion spring (43) that applies downward force to the valve body (32), that is, downward such that the valve body (32) mounts on the valve seat (26) and assumes a closed state, has been arranged between the lower surface side of the piston body (33) and the upper surface side of the valve unit (32a) of the valve body (32).
An explanation follows of the action of said pressure control valve (21 ) the dehumidification device (20) that includes this pressure control valve (21 ).
Since the pressures inside the regenerated air tank (10) and the original air tank (5) have both been kept at atmospheric pressure, and since at this time the primary side and the secondary side of the valve body (32) of the pressure control valve (21 ) have both been kept at atmospheric pressure, the valve body (32) is mounted on the valve seat (26) by means of the force applied by the springs for setting the opening pressure (41, 42).
In other words, the piston body (33) has pressure applied to it downwards in Figure 2 by the springs for setting the opening pressure (41, 42), the lower surface of this piston body (33) contacts the upper tip surface of the cylindrical abrading portion (32b) of the valve body (32) and pressure is thus applied downwards on the valve body (32), and owing to this the valve body is caused to be mounted on the valve seat (26).
ABer that, when the air compressor ( 1 ) begins rotation, the compressed air flows from the air compressor (1) into the primary side of the pressure control valve (21) through the medium of the aftercooler (2) and the dehumidifier (7), but since initially the pressure that pushes the valve body (32) upwards from the primary side is smaller than the force applied by the springs for setting the opening pressure (41, 42) the valve body (32) maintains a closed state.
When the pressure of the primary side of the pressure control valve (21 ) attains a prescribed value set beforehand and the pressure of this primary side becomes greater than the force applied by the springs for setting the opening pressure (41, 42), as shown in Figure 3 the valve body (32) and the piston body (33) resist the force applied by the springs for setting the opening pressure (41, 42) and move upwards, and the valve body (32), that is, the pressure control valve (21 ) changes to an open state, and the primary side and the secondary side, concretely, the dehumidifier (7) and the regenerated air tank (10) of Figure 1 change to a linked state. Now, when the piston body (33) moves upwards, the piston body (33) slides in contact at its inner radius relative to the medium-diameter part (34b) of the spring receiving element (34).
It is preferable that said prescribed value, in other words, the pressure of the primary side of the pressure control valve (21) at the point when the valve body (32) opens, be set in advance such that it is equal to the upper limit value of the pressure inside the original air tank (5) (for example, approximately 9 kgfr/cm2). As described above, this is because of the fact that it is optimal to make the pressure of the compressed air that passes through the dehumidifier (7) as high as possible in order to raise the dehumidification efficiency in the dehumidifier (7).
When the pressure control valve (21 ) changes to an open state, the compressed air that has passed through the dehumidifier (7) flows from the pressure control valve (21 ), the regenerated air tank (10) and the check valve (4) to the original air tank (5), and the pressures inside the regenerated air tank (10) and the original air tank (5) gradually rise.
Then, when the pressure inside the original air tank (5) reaches the prescribed upper limit value (for example, approximately 9 kgfr/cm2 as mentioned above), the pressure regulator S (6) begins to operate and at the same time as the driving of the air compressor ( 1 ) is stopped the discharge valve (13) changes to an open state.
When the driving of said air compressor (1) is stopped, the pressure differential between the primary side and the secondary side of the pressure control valve (21 ) disappears, so as shown in Figure 4 the valve body (32) rapidly moves downwards due to the force applied by the impulsion spring (43) and mounts on the valve seat (26), and thus the valve body (32), that is, the pressure control valve (21 ), changes to a closed state.
Relative to this, the pressure of the compressed air inside the regenerated air tank ( 10) acts on the lower surface of the piston body (33 ) though the medium of the through hole (32c), and in addition to this frictional force is present between the O-ring (36) and the sleeve (31 ) and frictional force is present between the O-ring (3 7) and said medium-diameter part (34b), so the piston body (33) does not move immediately downwards together with the valve body (32), but since the valve body (32) closes the linkage opening (25) the back flow of the compressed on the regenerated air tank ( 10) side through the medium of the pressure control valve (21 ) is prevented.
As noted above, when the pressure of the original air tank (5) attains the upper limit value and the air compressor (1) is stopped, and moreover the discharge valve (13) is opened, the compressed air inside the regenerated air tank ( 10) gradually flows back through the medium of the restrictor (12) and the check valve (11), and then it flows through the dehumidifier (7) and is discharged from discharge valve (13), and owing to this the adsorbent inside the dehumidifier (7) is dried and regenerated.
In addition, due to the fact that the compressed air inside the regenerated air tank ( 10) flows back the pressure inside the regenerated air tank ( 10) gradually declines, and when this occurs the piston body (33) moves downwards owing to the force applied by the springs for setting the opening pressure (41, 42) and once more comes into contact with the upper surface of the cylindrical abrading portion (32b) of the valve body (32) as shown in Figure 2.
After that, the compressed air inside the original air tank (S) is consumed by the air compressor not shown in the figure, and when the pressure inside the original air tank (5) declines to the prescribed lower limit value (for example, approximately 8 kgfr/cm2) the pressure regulator (6) begins to operate and the air compressor begins to work again, and in addition the discharge valve (13) changes to a closed state.
Owing to this, compressed air begins to be supplied from the air compressor (1) to the pressure control valve (21 ) through the medium of the aftercooler (2) and the dehumidification device (3), and then by repeating the same process as described above, h pressure inside the original air tank (5) is controlled such that it ordinarily falls within the range between the prescribed upper limit value and lower limit value. In this way, in the mode of this embodiment, a valve body (32) that makes the same movement as the conventional check valve that has been provided on the side in front of the pressure control valve inside the pressure control valve (21 ) has been built in, so it is possible to reduce the number of parts.
Next, an explanation is provided of the mode of the second embodiment of the present invention. As shown in Figure 5, this compressed air source device is configured such that compressed air is sent from the air compressor ( 1 ) to the original air tank (5) through the medium of a drain separator (50) and a dehumidification device (51). Here, the dehumidification device (51 ) is composed of a hollow-fiber membrane type dehumidifier (52) and a pressure control valve (21 ) that is the same as that in the mode of the first embodiment.
The hollow-fiber membrane type dehumidifier (52) is as shown in Figure 6 something wherein multiple hollow-fiber membranes (54) composed of a macromolecular substance is arranged between the entrance part (53a) and the exit part (53b) inside the case (53). Each of the hollow-fiber membranes (54) is configured such that it causes only the vapor in the compressed air to be passed through in the direction of its thickness and to be discharged to the outside of the hollow-fiber membrane (54), while the air is sent from the entrance part (53a) to the exit part (53b) without being passed through.
In addition, a restrictor (55) has been provided on the exit part (53b), a portion of the compressed air that reaches the exit part (53b) passes through the restrictor (SS) and is sent to the space on the outer side of the hollow-fiber membrane through the medium of a passageway (53c), this air acts as purging air, and the device is configured such that the vapor that passes through to the outside of said hollow-fiber membranes (54) is discharged from the purging air exit (54d).
An explanation follows below of the operation of said compressed air source device.
When the air compressor (1) begins to operate, compressed air is supplied from the air compressor ( 1 ) to the pressure control valve (21 ) through the medium of the drain separator (50) and the dehumidification device (S 1). Then, when the pressure of the primary side of the pressure control valve (21) reaches the prescribed value, that is, the upper limit value of the pressure inside the original air tank (5), the valve body (32) opens in the same manner as described above (Figure 3), and the compressed air that has passed through the pressure control valve (21) is supplied to the original air tank (5), and owing to this the pressure inside the original air tank (5) gradually rises.
Then, in the mode of this embodiment, at that stage when the compressed air has been supplied from the air compressor (1) to the original air tank (5), as described above a portion of the compressed air of the exit part (53b) of the dehumidifier (52) passes through the restrictor (55) and flows back, and the vapor that has been passed through to the outside of the hollow-fiber membranes (54) is discharged from the purged air exit (54d), so it is possible to perform simultaneously the supply of compressed air to the original air tank (5) and the regeneration action (the action that causes the vapor to be discharged) of the dehumidifier (52).
When the pressure inside the original air tank (5) attains the prescribed upper limit value, the pressure regulator (6) begins to operate, and air compressor (1 ) is stopped, but as noted above the regeneration of the dehumidifier (52} is carried out during the supply of compressed air to the original air tank (5), so there is no need to carry out the regeneration of the dehumidifier (52) before the time when the air compressor (1) is stopped.
For this reason, this mode of embodiment differs from the mode of the first embodiment, insofar as there is no need to provide a regenerated air tank ( 10) inside the dehumidification and a restrictor ( 12), check valve ( 11 ), etc., and in addition the check valve (4) between the regenerated air tank (10) and the original air tank (S) in the mode of the first embodiment become unnecessary, so it is possible to reduce to a great extent the number of parts of the compressed air source device, and as a result the time and effort required for maintenance of the dehumidifier (52) can also be curtailed.
Now, the valve body (32) inside the pressure control valve (21 ) here makes movements that prevent the back flow of compressed air from the original air tank (5), but since a valve body (32) possessing a fixnction equivalent to that of the check valve that had conventionally been provided separately from the pressure control device (21 ) has been built into the pressure control valve (21 ), it is possible to aim at a further reduction of the number of parts.
ABer that, when the air compressor ( 1 ) begins rotation, the compressed air flows from the air compressor (1) into the primary side of the pressure control valve (21) through the medium of the aftercooler (2) and the dehumidifier (7), but since initially the pressure that pushes the valve body (32) upwards from the primary side is smaller than the force applied by the springs for setting the opening pressure (41, 42) the valve body (32) maintains a closed state.
When the pressure of the primary side of the pressure control valve (21 ) attains a prescribed value set beforehand and the pressure of this primary side becomes greater than the force applied by the springs for setting the opening pressure (41, 42), as shown in Figure 3 the valve body (32) and the piston body (33) resist the force applied by the springs for setting the opening pressure (41, 42) and move upwards, and the valve body (32), that is, the pressure control valve (21 ) changes to an open state, and the primary side and the secondary side, concretely, the dehumidifier (7) and the regenerated air tank (10) of Figure 1 change to a linked state. Now, when the piston body (33) moves upwards, the piston body (33) slides in contact at its inner radius relative to the medium-diameter part (34b) of the spring receiving element (34).
It is preferable that said prescribed value, in other words, the pressure of the primary side of the pressure control valve (21) at the point when the valve body (32) opens, be set in advance such that it is equal to the upper limit value of the pressure inside the original air tank (5) (for example, approximately 9 kgfr/cm2). As described above, this is because of the fact that it is optimal to make the pressure of the compressed air that passes through the dehumidifier (7) as high as possible in order to raise the dehumidification efficiency in the dehumidifier (7).
When the pressure control valve (21 ) changes to an open state, the compressed air that has passed through the dehumidifier (7) flows from the pressure control valve (21 ), the regenerated air tank (10) and the check valve (4) to the original air tank (5), and the pressures inside the regenerated air tank (10) and the original air tank (5) gradually rise.
Then, when the pressure inside the original air tank (5) reaches the prescribed upper limit value (for example, approximately 9 kgfr/cm2 as mentioned above), the pressure regulator S (6) begins to operate and at the same time as the driving of the air compressor ( 1 ) is stopped the discharge valve (13) changes to an open state.
When the driving of said air compressor (1) is stopped, the pressure differential between the primary side and the secondary side of the pressure control valve (21 ) disappears, so as shown in Figure 4 the valve body (32) rapidly moves downwards due to the force applied by the impulsion spring (43) and mounts on the valve seat (26), and thus the valve body (32), that is, the pressure control valve (21 ), changes to a closed state.
Relative to this, the pressure of the compressed air inside the regenerated air tank ( 10) acts on the lower surface of the piston body (33 ) though the medium of the through hole (32c), and in addition to this frictional force is present between the O-ring (36) and the sleeve (31 ) and frictional force is present between the O-ring (3 7) and said medium-diameter part (34b), so the piston body (33) does not move immediately downwards together with the valve body (32), but since the valve body (32) closes the linkage opening (25) the back flow of the compressed on the regenerated air tank ( 10) side through the medium of the pressure control valve (21 ) is prevented.
As noted above, when the pressure of the original air tank (5) attains the upper limit value and the air compressor (1) is stopped, and moreover the discharge valve (13) is opened, the compressed air inside the regenerated air tank ( 10) gradually flows back through the medium of the restrictor (12) and the check valve (11), and then it flows through the dehumidifier (7) and is discharged from discharge valve (13), and owing to this the adsorbent inside the dehumidifier (7) is dried and regenerated.
In addition, due to the fact that the compressed air inside the regenerated air tank ( 10) flows back the pressure inside the regenerated air tank ( 10) gradually declines, and when this occurs the piston body (33) moves downwards owing to the force applied by the springs for setting the opening pressure (41, 42) and once more comes into contact with the upper surface of the cylindrical abrading portion (32b) of the valve body (32) as shown in Figure 2.
After that, the compressed air inside the original air tank (S) is consumed by the air compressor not shown in the figure, and when the pressure inside the original air tank (5) declines to the prescribed lower limit value (for example, approximately 8 kgfr/cm2) the pressure regulator (6) begins to operate and the air compressor begins to work again, and in addition the discharge valve (13) changes to a closed state.
Owing to this, compressed air begins to be supplied from the air compressor (1) to the pressure control valve (21 ) through the medium of the aftercooler (2) and the dehumidification device (3), and then by repeating the same process as described above, h pressure inside the original air tank (5) is controlled such that it ordinarily falls within the range between the prescribed upper limit value and lower limit value. In this way, in the mode of this embodiment, a valve body (32) that makes the same movement as the conventional check valve that has been provided on the side in front of the pressure control valve inside the pressure control valve (21 ) has been built in, so it is possible to reduce the number of parts.
Next, an explanation is provided of the mode of the second embodiment of the present invention. As shown in Figure 5, this compressed air source device is configured such that compressed air is sent from the air compressor ( 1 ) to the original air tank (5) through the medium of a drain separator (50) and a dehumidification device (51). Here, the dehumidification device (51 ) is composed of a hollow-fiber membrane type dehumidifier (52) and a pressure control valve (21 ) that is the same as that in the mode of the first embodiment.
The hollow-fiber membrane type dehumidifier (52) is as shown in Figure 6 something wherein multiple hollow-fiber membranes (54) composed of a macromolecular substance is arranged between the entrance part (53a) and the exit part (53b) inside the case (53). Each of the hollow-fiber membranes (54) is configured such that it causes only the vapor in the compressed air to be passed through in the direction of its thickness and to be discharged to the outside of the hollow-fiber membrane (54), while the air is sent from the entrance part (53a) to the exit part (53b) without being passed through.
In addition, a restrictor (55) has been provided on the exit part (53b), a portion of the compressed air that reaches the exit part (53b) passes through the restrictor (SS) and is sent to the space on the outer side of the hollow-fiber membrane through the medium of a passageway (53c), this air acts as purging air, and the device is configured such that the vapor that passes through to the outside of said hollow-fiber membranes (54) is discharged from the purging air exit (54d).
An explanation follows below of the operation of said compressed air source device.
When the air compressor (1) begins to operate, compressed air is supplied from the air compressor ( 1 ) to the pressure control valve (21 ) through the medium of the drain separator (50) and the dehumidification device (S 1). Then, when the pressure of the primary side of the pressure control valve (21) reaches the prescribed value, that is, the upper limit value of the pressure inside the original air tank (5), the valve body (32) opens in the same manner as described above (Figure 3), and the compressed air that has passed through the pressure control valve (21) is supplied to the original air tank (5), and owing to this the pressure inside the original air tank (5) gradually rises.
Then, in the mode of this embodiment, at that stage when the compressed air has been supplied from the air compressor (1) to the original air tank (5), as described above a portion of the compressed air of the exit part (53b) of the dehumidifier (52) passes through the restrictor (55) and flows back, and the vapor that has been passed through to the outside of the hollow-fiber membranes (54) is discharged from the purged air exit (54d), so it is possible to perform simultaneously the supply of compressed air to the original air tank (5) and the regeneration action (the action that causes the vapor to be discharged) of the dehumidifier (52).
When the pressure inside the original air tank (5) attains the prescribed upper limit value, the pressure regulator (6) begins to operate, and air compressor (1 ) is stopped, but as noted above the regeneration of the dehumidifier (52} is carried out during the supply of compressed air to the original air tank (5), so there is no need to carry out the regeneration of the dehumidifier (52) before the time when the air compressor (1) is stopped.
For this reason, this mode of embodiment differs from the mode of the first embodiment, insofar as there is no need to provide a regenerated air tank ( 10) inside the dehumidification and a restrictor ( 12), check valve ( 11 ), etc., and in addition the check valve (4) between the regenerated air tank (10) and the original air tank (S) in the mode of the first embodiment become unnecessary, so it is possible to reduce to a great extent the number of parts of the compressed air source device, and as a result the time and effort required for maintenance of the dehumidifier (52) can also be curtailed.
Now, the valve body (32) inside the pressure control valve (21 ) here makes movements that prevent the back flow of compressed air from the original air tank (5), but since a valve body (32) possessing a fixnction equivalent to that of the check valve that had conventionally been provided separately from the pressure control device (21 ) has been built into the pressure control valve (21 ), it is possible to aim at a further reduction of the number of parts.
Claims (6)
1. A pressure control valve possessing (a) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (b) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (c) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (d) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (e) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
2. The pressure control valve according to Claim 1 that supports said valve for setting the opening pressure by means of a spring receiving element provided such that it can adjust its position relative to said valve unit.
3. The pressure control valve according to Claim 2 wherein said piston body is annular, and said spring receiving element possesses a shaft-shaped part that guides the sliding by contact of said piston body from the inner side by passing the piston completely through it.
4. The compressed air dehumidification device employing the pressure control valve wherein:
(a) it is a compressed air dehumidification device provided between the compressed air source and the air tank;
(b) it is equipped with (i) a dehumidifier that dehumidifies the compressed air from said compressed air source; and (ii) a pressure control valve that is provided between this dehumidifier and said air tank, and that opens the valve when the pressure on the dehumidifier side has attained a prescribed pressure; and (c) it possesses (i) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (ii) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (iii) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (iv) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (v) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
(a) it is a compressed air dehumidification device provided between the compressed air source and the air tank;
(b) it is equipped with (i) a dehumidifier that dehumidifies the compressed air from said compressed air source; and (ii) a pressure control valve that is provided between this dehumidifier and said air tank, and that opens the valve when the pressure on the dehumidifier side has attained a prescribed pressure; and (c) it possesses (i) a valve unit, which possesses a connection opening to the primary side and to the secondary side; (ii) a valve body that is provided on the valve itself and that links or isolates from each other the primary side and the secondary side based on the pressure differential between the primary side pressure and the secondary side pressure; (iii) a piston body provided such that it can contact and release relative to the valve body by sliding in contact with this valve body on the same axis, and that demarcates the secondary side and the atmospheric pressure chamber; (iv) a spring for setting the opening pressure that has been provided inside said atmospheric pressure chamber and that applies force to said valve body in a closing direction in a state wherein said piston body and said valve body are in contact; and (v) an impulsion spring that is arranged between said piston body or said valve unit and said valve body and that applies force to said valve body in a closing direction.
5. The compressed air dehumidification device employing the pressure control valve according to Claim 4 wherein said dehumidifier is an adsorption and regeneration type dehumidifier.
6. The compressed air dehumidification device employing the pressure control valve according to Claim 5 wherein said dehumidifier is a hollow-fiber membrane type dehumidifier.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24532699A JP2001065721A (en) | 1999-08-31 | 1999-08-31 | Pressure control valve and dehumidifier system of compressed air using it |
| CA002359773A CA2359773A1 (en) | 1999-08-31 | 2001-10-23 | Pressure control valve and a compressed air dehumidification device that uses this |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24532699A JP2001065721A (en) | 1999-08-31 | 1999-08-31 | Pressure control valve and dehumidifier system of compressed air using it |
| CA002359773A CA2359773A1 (en) | 1999-08-31 | 2001-10-23 | Pressure control valve and a compressed air dehumidification device that uses this |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2359773A1 true CA2359773A1 (en) | 2003-04-23 |
Family
ID=32043788
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002359773A Abandoned CA2359773A1 (en) | 1999-08-31 | 2001-10-23 | Pressure control valve and a compressed air dehumidification device that uses this |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP2001065721A (en) |
| CA (1) | CA2359773A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005075055A (en) * | 2003-08-29 | 2005-03-24 | Mitsubishi Electric Corp | Method for controlling vehicle air compressor device |
| CN103470829A (en) * | 2013-09-21 | 2013-12-25 | 徐介斌 | Direct-viewed-pointer pressure relief valve capable of presetting opening pressure |
| KR102229789B1 (en) * | 2020-09-16 | 2021-03-19 | 유진기공산업주식회사 | Urgent braking valve device for railway vehicles |
| KR102431693B1 (en) * | 2021-01-21 | 2022-08-31 | 주식회사 썬프리시즌 | Back pressure type release valve |
| CN113175537B (en) * | 2021-04-24 | 2022-02-08 | 开维喜阀门集团有限公司 | Gate valve system based on intelligent hydraulic engineering and operation method thereof |
-
1999
- 1999-08-31 JP JP24532699A patent/JP2001065721A/en active Pending
-
2001
- 2001-10-23 CA CA002359773A patent/CA2359773A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001065721A (en) | 2001-03-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |