JP2012106157A - Valve device, and air drier - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a valve device for regenerating an air dryer considering the compatibility of rapid air filling and the versatility of the time setting of the air sending time adjusting function for the regeneration treatment of a desiccant.SOLUTION: The valve device 10 for regenerating the air dryer includes a piston 14 for internally demarcating a chamber 11 into the space on one end side of an air tank and the space on the other end side of a drying part, valves (28 and 31) closed by the movement of the piston to one side of the air tank and opened by the movement of the piston to the other side of the air tank, an energizing means 26 for energizing the piston in a valve closing direction, the hole part (16) formed to the piston and allowing the air to flow from one end side space to the other end side space corresponding to the difference between the pressure of the air in the one end side space and the pressure of the air in the other end side space and an auxiliary flow channel (33) having control means (21 and 29) for permitting the flow of the air from the other end side space to one end side space and controlling the flow of the air from one end side space to the other end side space.

Description

The present invention relates to an air dryer regeneration valve device having an air feed time adjusting function and an air dryer provided with the regeneration valve device.
In this specification, the valve device means that the piston provided in the chamber, which is the atrioventricular chamber, moves when the fluid pressure in the space on at least one side with respect to the piston changes, and the valve is opened and closed. A device that is configured to be switched.
The air dryer is a device that removes moisture and oil from a gas containing moisture and oil, and dries the gas.

  Conventionally, as shown in Patent Document 1, there has been a drying device (air dryer) that is used in an air brake device of a vehicle and removes moisture in compressed air. The drying apparatus had a drying container filled with a renewable desiccant and a regeneration tank in which dry compressed air in which moisture was adsorbed by the desiccant was stored. And the compressed air sent from the air compressor was dried with the desiccant of the drying container, and it was comprised so that it might store in the air tank of an air brake device. Under the present circumstances, it provided so that a part of dry compressed air might be stored in the reproduction | regeneration tank in a drying apparatus. And it was comprised so that the desiccant in a drying container could be regenerated by making dry dry air in a regeneration tank flow backward.

Japanese Patent No. 3167251

Here, it is conceivable to use an air tank outside the drying device without providing the regeneration tank in the drying device. However, if the regeneration tank is simply abolished, the dry compressed air in the air tank will flow backward. Will continue to do.
Therefore, it is necessary to limit the amount of dry compressed air necessary to regenerate the desiccant so as to back flow, and a valve device having an air feed time adjustment function is conceivable to limit the amount of back flow.

  FIGS. 6A and 6B are cross-sectional views showing the problems of the valve device having the air feed time adjusting function considered by the applicant. Among these, FIG. 6 (A) is a figure which shows a mode that a valve is switched from the closed state to the open state. On the other hand, FIG. 6B is a diagram showing a state where the valve is switched from the opened state to the closed state.

  As shown in FIG. 6A, the valve device 40 includes a chamber 43, a piston 41, a valve body 44, a valve seat portion 49, and a compression coil spring 45. Among these, the chamber 43 is configured so that air pressure acts. The piston 41 is configured to be able to slide inside the chamber in the axial direction of the piston 41. Specifically, an O-ring 46 is attached to the outer periphery of the piston 41, and the O-ring 46 is in contact with the inner surface of the chamber 43.

  Furthermore, the valve body 44 is provided on one end side (lower side in the figure) of the piston 41 so as to be movable together with the piston 41. And the valve body 44 will be in the state which the valve | bulb obstruct | occluded by contacting with the valve seat part 49 provided in the opening of the said one end side of the chamber 43. FIG. On the other hand, when the valve body 44 is separated from the valve seat portion 49, the valve is opened. The compression coil spring 45 is provided on the other end side (upper side in the figure) of the movement direction of the piston 41 in the chamber 43, and is configured to urge the piston 41 toward the one end side (lower side in the figure). Yes. Therefore, in a normal state where no air pressure is acting on the inside of the chamber 43, the valve is closed.

  The piston 41 has a relatively small-diameter hole 42 for controlling the time from when the valve is opened to adjust the air feeding time and the air starts to flow backward until it closes. Yes. The hole 42 allows air to flow in accordance with the difference between the pressure of the air on the one end side (lower side in the figure) in the chamber relative to the piston 41 and the pressure of the air on the other end side (upper side in the figure). It is comprised so that it can flow from one side to the other. Here, the time from when the valve is opened as the air feed time adjusting means and the air starts to flow backward until it is closed is determined by the opening diameter of the hole 42.

  Furthermore, the valve seat portion 49 on the one end side (the lower side in the drawing) of the chamber 43 is connected to the first flow path 47. The first flow path 47 is connected to the air tank. On the other hand, the other end side (upper side in the drawing) of the chamber 43 is connected to the second flow path 48. The second flow path 48 is connected to a drying container (not shown), and is further connected to an exhaust valve (not shown) and a compressor (not shown) via the drying container.

  Then, compressed air is sent from the second flow path 48 to the other end side (upper side in the drawing) of the chamber 43 with the piston 41 as a reference. Then, the pressure of the air on the other end side (upper side in the drawing) of the chamber 43 with respect to the piston 41 becomes larger than the pressure of the air on the one end side (lower side in the drawing). Therefore, the air on the other end side (upper side in the figure) in the chamber 43 gradually flows into the one end side (lower side in the figure) in the chamber 43 through the hole 42. Therefore, air accumulates on the one end side (lower side in the figure) of the chamber 43, and the pressure of air on the one end side (lower side in the figure) gradually increases.

  Then, the pressure of the air on the one end side (the lower side in the figure) of the chamber 43 moves the piston 41 gradually toward the other end side (the upper side in the figure) against the urging force of the compression coil spring 45. Then, when the piston 41 moves to the other end side (upper side in the figure), the valve is opened. After the valve is opened, the air tank reaches a set pressure, and the exhaust valve is opened by a pressure governor (not shown). Therefore, the compressed air from the second flow path 48 is discharged from the exhaust valve. Then, the air from the air tank connected to the first flow path 47 starts to flow backward to the second flow path 48 via the valves (44, 49) and the other end side (upper side in the drawing) of the chamber 43.

  As shown in FIG. 6 (B), the air feed time adjusting function starts to operate when the valve is opened and the air starts to flow backward. Specifically, the pressure of the air on the other end side (upper side in the drawing) of the chamber 43 with respect to the piston 41 becomes lower than the pressure of the air on the one end side (lower side in the drawing). Therefore, the air on the one end side (lower side in the figure) gradually flows out to the other end side (upper side in the figure) through the hole 42. Accordingly, the pressure of the air on the one end side (the lower side in the figure) gradually decreases. And if the magnitude | size of the force which pushes the piston 41 with the pressure of the air of the said one end side (lower side in the figure) becomes smaller than the magnitude | size of the force which the compression coil spring 45 pushes the piston 41, with the urging force of the compression coil spring 45, The piston 41 gradually moves toward the one end side (the lower side in the figure).

  During this time, the valve is in an open state, and air from the first flow path 47 is sent to the second flow path 48 via the valves (44, 49) and the other end side (upper side in the figure) of the chamber 43. continuing. Then, when a predetermined time (for example, 30 seconds) has elapsed since the valve opened and air began to flow backward, the valve body 44 contacts the valve seat portion 49 and is switched to the closed state. Air flow from the passage 47 is stopped. In this manner, the air feed time adjustment function is configured to allow air to flow back through the valve for a predetermined time (for example, 30 seconds).

  However, when the valve is switched from the closed state to the open state before the air feed time adjustment function starts to operate, air is supplied to the one end side (lower side in the figure) of the chamber 43 only through the hole 42. Since it is configured to flow in, in order to switch the valve from the closed state to the open state, the time approximately the same as the time (for example, 30 seconds) during which the air feed time adjustment function for switching from the open state to the closed state is operating (For example, 30 seconds) is required.

In other words, in the valve device 40 using the time during which the air in the volume chamber on the one end side (lower side in the figure) of the chamber 43 with respect to the piston 41 is exhausted, the volume on the one end side (lower side in the figure). In order to introduce air into the chamber, a time substantially the same as the exhaust time was required.
The time required for regeneration of the desiccant varies depending on the system, and is determined by the opening diameter of the hole 42. However, the time for filling the volume chamber with air (time until the valve opens) is the same as that of the hole 42. The configuration was determined by the opening diameter. For this reason, the timing of regeneration of the desiccant depends on the air filling time, and it is impossible to achieve both the requirement for quick air filling and the time setting freedom of the air feed time adjustment function for the regeneration process. . For example, when only 15 seconds can be charged for air, sufficient air filling for operating the air feed time adjustment function of 30 seconds cannot be performed, and the air feed time adjustment function is only halfway for 15 seconds. Will act. With this, the desiccant cannot be sufficiently regenerated.

  The present invention has been made in view of such a situation, and the problem is that there is a need for quick air filling and the freedom of time setting of the air feed time adjustment function for the regeneration treatment of the desiccant. An object of the present invention is to provide a regenerator valve device for an air dryer in consideration of compatibility.

  In order to achieve the above object, a regeneration valve device for an air dryer according to a first aspect of the present invention includes a drying unit that performs a drying process of a compressed gas supplied from a gas compressor, and a dried compressed gas that has been dried. A gas tank that is provided between the gas tank and a piston that moves in the chamber, and a piston that moves in the chamber, wherein the chamber has one end side space on the gas tank side, and the drying unit side. A piston that is provided in the other end side space, a valve that is closed when the piston moves toward the one end side, and an open state when the piston moves toward the other end side, and a direction in which the valve closes An urging means for urging the piston, and a gas formed in the piston, and gas is supplied from one side according to a difference between a gas pressure in the one end side space and a gas pressure in the other end side space. Hole to flow to the other A restricting means for allowing a gas flow from the other end side space of the chamber toward the one end side space direction and restricting a gas flow from the one end side space toward the other end side space in the flow path. And an auxiliary flow path.

  According to this aspect, when the gas is sent from the gas compressor to the other end side space in the chamber, the gas sent to the other end side space passes through the hole and the auxiliary flow path. It can flow into the one end side space in the chamber. Therefore, the amount of the flow-in per unit time can be increased as compared with the above-described configuration (see FIG. 6) in which the gas flows only through the hole. As a result, it is possible to shorten the time required for accumulating gas in the one end side space in the chamber, moving the piston to the other end side, and switching the valve to the open state. That is, since a sufficient amount of gas can be flowed into the one end side space in the chamber and the valve can be opened, there is no possibility that the air feed time adjusting function starts to work in a halfway state.

On the other hand, after the valve is switched to the open state and the dry compressed gas in the gas tank starts to flow backward, the gas in the one end side space in the chamber passes through the hole to the other end side space. To gradually flow out. And by the outflow of this gas, the pressure of the said one end side space in the said chamber becomes low. At this time, the urging force of the urging means moves the piston to the one end side, and the valve is in the closed state by the movement of the piston. Thus, the dry compressed gas in the gas tank can be made to flow backward for a predetermined time.
That is, in the configuration in which the length of the backflow time is controlled by the hole portion, both the requirement for quick air filling and the freedom of time setting of the air feed time adjustment function for the regeneration treatment of the desiccant are compatible. Can do.

  According to a second aspect of the present invention, in the first aspect, the auxiliary flow path is formed by a clearance between an outer peripheral surface of a flange portion of the piston and an inner peripheral surface of the chamber, and the restriction means However, the chamber is constituted by a cup seal that is accommodated in a recess formed along the outer peripheral surface of the flange portion so that the opening portion faces the one end side space, and the opening portion expands and contracts by elastic deformation, When the gas flows from the other end side space into the one end side space in addition to the hole portion, the opening portion of the cup seal is reduced and the clearance is opened, so that the clearance is opened. When the gas flows into the one end side space and the gas flows out from the one end side space to the other end side space in the chamber, the opening of the cup seal is enlarged. The clearance Te is by being closed, the gas to the other end side space only through said hole portion is characterized by having a structure that flows.

  According to this aspect, in addition to the same effect as the first aspect, the check valve function can be simplified and the structure can be reduced.

  According to a third aspect of the present invention, in the first or second aspect, gas is sent from the drying unit to the other end side space in the chamber, and the gas sent to the other end side space is The pressure flows into the one end side space in the chamber, and the pressure in the one end side space in the chamber increases, so that the pressure moves against the urging force of the urging means, and the piston moves toward the other end side. By moving the piston, the valve is in the open state, and the gas in the one end side space in the chamber flows out to the other end side space through the hole, and the outflow of the gas A configuration in which the pressure of the one end side space in the chamber is lowered, whereby the biasing force of the biasing means moves the piston to the one end side, and the valve is in the closed state by the movement of the piston. That is And butterflies.

  According to this aspect, in addition to the same effect as the aspect of the first or second aspect, the valve is opened by sending gas from the drying unit to the other end side space in the chamber. be able to. The time from when the gas starts to flow until the valve is switched to the closed state can be adjusted by the opening diameter of the hole.

  An air dryer according to a fourth aspect of the present invention is an air dryer comprising a drying unit having a recyclable desiccant and a regeneration valve device connected to one end side of a flow path in the drying unit. The regeneration valve device is the regeneration valve device according to any one of the first to third aspects, and a gas compressor and a gas discharge unit are connected to the other end of the flow path in the drying unit. And the gas is sent by the gas compressor to the one end side space in the chamber through the hole of the regeneration valve device and the auxiliary flow path. Is opened, and the gas discharge part is opened to the atmosphere, so that the dry compressed gas in the gas tank is sent to the drying part via the valve of the regeneration valve device, and from the gas discharge part. Discharged Characterized in that it is a configuration that.

  According to this aspect, the air dryer includes the regeneration valve device according to any one of the first to third aspects. Therefore, in the air dryer, the same function and effect as in any one of the first to third aspects can be obtained. Further, when the gas discharge part is opened to the atmosphere, the air feed time adjustment function starts to operate, and the dry compressed gas in the gas tank can be used for regeneration of the desiccant for a predetermined time.

The figure which shows piping of the vehicle provided with the valve apparatus of a present Example. Sectional drawing which shows the outline of the valve apparatus of a present Example (blocking state). Sectional drawing which shows operation | movement of the valve apparatus of a present Example (the air inflow start). Sectional drawing which shows operation | movement of the valve apparatus of a present Example (open state (backflow)). Sectional drawing which shows operation | movement of the valve apparatus of a present Example (at the time of an air feed time adjustment function effect | action). (A) (B) is sectional drawing which shows the problem of the valve apparatus which the applicant has considered.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of a piping configuration of a vehicle such as a truck provided with the valve device of the present embodiment. In addition, the principal part of the structure of this invention is shown in figure, and illustration of the other member and gas flow path is abbreviate | omitted.
As shown in FIG. 1, an air processing system 1 provided in a vehicle brake system according to this embodiment includes an air dryer regeneration valve device 10 (hereinafter simply referred to as a “valve device”) having an air feed time adjustment function. And a drying unit 5. The piping configuration of the air processing system 1 of the present embodiment can be used as, for example, an air brake system of a commercial vehicle such as a truck or a general automobile air conditioning system.

  Specifically, the air processing system 1 includes a compressor 2 that is a gas compressor, a gas tank 7 for the system, a valve device 10, a drying unit 5, an exhaust valve 3 that is a gas discharge unit, and a silencer 4. It is equipped with. Among these, the compressor 2 is provided so that gas can be compressed and this compressed gas can be sent. Moreover, the gas tank 7 can store the dried gas, and is configured to be used in, for example, an air brake system. Furthermore, the valve device 10 is provided in a state in which the valve is closed when the gas pressure is not acting, and can be switched between an open state and a closed state of the valve by a so-called pilot command. Has been.

  Moreover, the drying part 5 has the desiccant 6 inside and is provided so that the gas which passes can be dried. Furthermore, the exhaust valve 3 is normally provided in a state in which the valve is closed, and is configured to be able to switch between the open state and the closed state of the valve by a pilot command from a pressure governor (not shown). . Moreover, the silencer 4 is provided so that the sound at the time of discharging | emitting gas can be made small.

One of the valves of the valve device 10 based on the valve is connected to the gas tank 7 by the first flow path 30. The other is connected to the drying unit 5 by the second flow path 32. Further, the first flow path 30 and the second flow path 32 are connected by the first check valve 8.
Here, the “check valve” refers to a valve configured to allow a flow in one direction and stop a flow in the opposite direction. Also called check valve.

In the present embodiment, the first check valve 8 is provided so as to enable the flow from the drying unit 5 to the gas tank 7 and stop the flow from the gas tank 7 to the drying unit 5.
The first check valve 8 is a valve with a spring. When a pressure exceeding a predetermined level is applied, the gas flows from the drying unit 5 to the gas tank 7 against the urging force of the spring.

  A compressor 2 and an exhaust valve 3 are connected to the side of the drying unit 5 opposite to the side connected to the valve device 10. Furthermore, a silencer 4 is connected to the exhaust valve 3 on the side opposite to the side connected to the drying unit 5 and the compressor 2.

Hereinafter, the configuration and operation of the valve device 10 will be described in detail.
As will be described in detail later, the valve device 10 has a second check function having a check valve function in the first hole portion 16 used for air venting and filling and the third flow path 33 parallel to the flow path used for air venting and filling. And a valve 29. In this embodiment, the piston cup 21 (see FIGS. 2 to 5) corresponds to the second check valve 29.

  In a state where the exhaust valve 3 is closed, the compressed gas is sent from the compressor 2 to the drying unit 5, and the compressed gas is dried by the drying unit 5. Then, the dried compressed gas is sent to the gas tank 7 via the first check valve 8. At this time, the dried compressed gas also flows into the valve device 10 to switch the valve of the valve device 10 to an open state. Specifically, the dried compressed gas flows from the second flow path 32 into the chamber of the valve device 10 body through the second check valve 29 and the first hole portion 16 of the third flow path 33. Thereby, the valve of the valve device 10 is switched to the open state. Accordingly, the dried compressed gas is sent to the gas tank 7 also through the valve device 10.

  Here, the gas flows into the chamber not only through the first hole portion 16 but also through the second check valve 29 of the third flow path 33. Therefore, the valve of the valve device 10 is switched from the closed state to the open state at an earlier timing compared to the configuration (see FIG. 6) in which the gas flows through only the hole portion 42 (see FIG. 6) described above. Can do. Therefore, the request | requirement of quick air filling can be satisfy | filled.

  And it is comprised so that the compressed gas dried in the gas tank 7 may be stored. When the pressure in the gas tank 7 reaches the set pressure, a pressure governor (not shown) generates a control pressure as an air pressure signal, and switches the exhaust valve 3 to an open state. Thereby, the compressed gas from the compressor 2 is exhausted from the exhaust valve 3 and the silencer 4 to the atmosphere. Further, the dry compressed gas in the gas tank 7 flows back through the valve device 10 for a predetermined time to regenerate the desiccant 6 in the drying unit 5.

  At this time, the valve device 10 is configured to cause the dry compressed gas to flow backward for a predetermined time by operating an air feed time adjusting function. As will be described in detail later, when the valve of the valve device 10 is opened and the dry compressed gas starts to flow backward, the gas that has flowed into the chamber gradually escapes from the first hole 16 to the second flow path 32. And when predetermined time (for example, 30 seconds) passes as an air feed time adjustment function, it is comprised so that the valve apparatus 10 may be switched to a obstruction | occlusion state.

  Then, the gas used for regeneration is discharged from the exhaust valve 3 to the atmosphere. Thereafter, when the pressure value of the gas tank 7 falls below a set value by using an air brake or the like, a pressure governor (not shown) switches the exhaust valve 3 to a closed state. Thereby, as mentioned above, dry compressed gas is sent to the gas tank 7, and the pressure of the gas tank 7 reaches the set pressure.

Next, details of the valve device 10 having an air feed time adjustment function will be described.
FIG. 2 is a cross-sectional view schematically showing the closed valve device of the present embodiment.
As shown in FIG. 2, the valve device 10 of the present embodiment includes a chamber 11, a piston 14, a valve body 28, and a compression coil spring 27 as an urging means 26.
Among these, the chamber 11 is provided so that the pressure of gas can act.

  The piston 14 is configured to be able to slide inside the chamber 11 in the axial direction of the shaft portion 15 of the piston 14. Furthermore, one end side (lower side in the figure) of the movement direction of the piston 14 in the chamber 11 is connected to the first flow path 30. Further, a valve body 28 is provided on one end side of the piston 14. The valve body 28 is configured to move integrally with the piston 14, and comes into contact with the valve seat portion 31 provided at the opening of the first flow path 30 to close the valve. Further, when the valve body 28 is separated from the valve seat portion 31, the valve is switched to an open state.

The compression coil spring 27 is provided on the other end side (upper side in the drawing) of the chamber 11 in the moving direction of the piston 14. And it is comprised so that the piston 14 may be urged | biased to the said one end side (lower side in a figure).
Furthermore, the piston 14 has a first hole portion 16 having a relatively small diameter. It is a so-called orifice. The first hole portion 16 corresponds to the difference between the gas pressure on the one end side (lower side in the figure) and the gas pressure on the other end side (upper side in the figure) in the chamber with the piston 14 as a reference. It is comprised so that gas can be flowed from one side to the other.

  Specifically, when the gas pressure on the one end side (the lower side in the figure) is higher than the pressure on the other end side (the upper side in the figure), the one end side (the lower side in the figure) to the other end side (the figure Gas flows to the middle upper side. On the contrary, when the pressure of the gas on the other end side (upper side in the figure) is higher than the pressure on the one end side (lower side in the figure), the other end side (upper side in the figure) to the one end side (lower side in the figure) Gas flows to). The length of time of the air feed time adjustment function is determined by the amount of gas flowing per unit time from the one end side (lower side in the figure) to the other end side (upper side in the figure) through the first hole 16. It is configured.

  A piston cup 21 made of an elastic material is attached to the outer periphery of the piston 14. Specifically, a groove portion 19 is formed on the outer periphery of the piston 14, and the piston cup 21 is attached so as to fit into the groove portion 19. Therefore, the piston cup 21 can move in the axial direction integrally with the piston 14 while being in contact with the first sliding surface 12 of the chamber 11.

  Here, the piston cup 21 is provided with a sealing portion 24 that seals one gas in the chamber 11 with the piston 14 as a reference between the piston 14 and the first sliding surface 12. The sealing part 24 is formed so as to be divided into two branches toward the space to be sealed. In this embodiment, the part divided into two is called an opening 25. The piston cup 21 is attached to the piston 14 so that the opening 25 of the piston cup 21 faces the one end side (the lower side in the figure).

  Thereby, as will be described in detail later, gas is prevented from flowing out from the one end side (the lower side in the figure) to the other end side (the upper side in the figure) and from the other end side (the upper side in the figure). It is possible to allow gas to flow into the one end side (lower side in the figure). In other words, by making the opening 25 face the one end side (lower side in the figure), the same effect as the check valve can be obtained.

An O-ring 20 is attached to the shaft portion 15 of the piston 14. The piston 14 and the shaft portion 15 are provided to move while the O-ring 20 is in contact with the second sliding surface 13. In addition, a penetrating second hole portion 17 is formed inside the shaft portion 15. The other end side (upper side in the figure) of the second hole portion 17 is configured such that the gas on the other end side (upper side in the figure) of the chamber 11 can enter and exit. Furthermore, the other end side (upper side in the drawing) of the chamber 11 is connected to the second flow path 32.
When the compressed gas is not sent from the compressor 2 and the air feed time adjusting function is not operating, the valve device 10 is in a state where the valve is closed by the compression coil spring 27.

Next, the operation of the valve device 10 having an air feed time adjustment function will be described.
FIG. 3 is a cross-sectional view showing the operation of the valve device 10 when gas inflow starts.
As shown in FIG. 3, as described above, the dry compressed gas is sent from the compressor 2 to the other end side (upper side in the drawing) of the chamber 11 from the second flow path 32. The dry compressed gas sent to the other end side (upper side in the figure) of the chamber 11 flows into the one end side (lower side in the figure) of the chamber 11 with the piston 14 as a reference through the first hole 16. To do.

  Further, the dry compressed gas sent to the other end side (upper side in the figure) of the chamber 11 is based on the piston 14 even between the piston cup 21 and the first sliding surface 12 of the chamber 11. It flows into the one end side (lower side in the figure) of the chamber 11. This is the third flow path 33 described above. This is so that when the pressure of the dry compressed gas acts from the other end side (upper side in the figure) toward the one end side (lower side in the figure), it opens to the fork of the sealing portion 24 of the piston cup 21. It is deformed to close the branched tip side. This is because an appropriate gap can be formed between the piston cup 21 and the first sliding surface 12.

  Therefore, compared with the configuration described above (see FIGS. 6A and 6B), gas can be stored in the one end side (lower side in the figure) of the chamber 11 with the piston 14 as a reference in a short time, The gas pressure on the one end side (lower side in the figure) can be increased. The gas pressure on one end side (lower side in the figure) moves the piston 14 and the shaft portion 15 to the other end side (upper side in the figure) against the urging force of the compression coil spring 27. As a result, the valve body 28 starts to be separated from the valve seat portion 31, and the valve is switched from the closed state to the open state.

FIG. 4 is a cross-sectional view showing an outline of the valve device 10 in an open state according to this embodiment.
As shown in FIG. 4, the dry compressed gas sent to the other end side (upper side in the figure) of the chamber 11 is the one end side (lower side in the figure) of the chamber 11 with the piston 14 as a reference from the state shown in FIG. ). Thereby, the pressure of the gas on the one end side (lower side in the figure) is further increased. Accordingly, the piston 14 and the shaft portion 15 are further moved to the other end side (upper side in the drawing). As a result, the valve is completely opened.

  As described above, the pressure of the gas tank 7 reaches the set pressure, and a pressure governor (not shown) switches the exhaust valve 3 to the open state. Thereby, the compressed gas from the compressor 2 is exhausted from the exhaust valve 3 to the atmosphere, and the pressure on the other end side (upper side in the drawing) in the chamber 11 is reduced. Then, the dry compressed gas in the gas tank 7 described above flows into the chamber 11 through the first flow path 30. Specifically, the other end side of the chamber 11 with reference to the piston 14 passes through the valve body 28 and the second hole portion 17 of the shaft portion 15 from the valve seat portion 31 of the first flow path 30 (in the drawing). Flow upward). Then, the dry compressed gas flows out from the other end side (upper side in the drawing) of the chamber 11 to the second flow path 32, is sent to the drying unit 5, and is used to regenerate the desiccant 6 in the drying unit 5. The gas used for regeneration is discharged to the atmosphere via the exhaust valve 3.

FIG. 5 is a cross-sectional view showing the operation of the valve device 10 when the air feed time adjusting function of this embodiment is operated.
As shown in FIG. 5, when the valve of the valve device 10 is opened and the dry compressed gas starts to flow backward, the air feed time adjusting function by the first hole portion 16 starts to act. Specifically, the gas on the one end side (lower side in the figure) of the chamber 11 with respect to the piston 14 gradually flows out to the other end side (upper side in the figure) through the first hole 16. The amount of gas flowing out per unit time is determined by the size of the first hole 16. Then, the gas pressure on the one end side (lower side in the figure) of the chamber 11 with respect to the piston 14 gradually decreases.
In addition, while gradually decreasing, the dry compressed gas in the gas tank 7 described above continues to flow to the drying unit 5 through the first flow path 30, the chamber 11, and the second flow path 32.

Then, the pressure of the gas on the one end side (lower side in the figure) of the chamber 11 with respect to the piston 14 gradually decreases, and the magnitude of the force pushing the piston 14 by the pressure of the gas is such that the compression coil spring 27 is the piston. It becomes smaller than the magnitude of the force pushing 14. Therefore, the piston 14 and the shaft portion 15 gradually move toward the one end side (the lower side in the figure) by the urging force of the compression coil spring 27.
As a result, after a predetermined time (for example, 30 seconds) has elapsed since the valve was opened and the dry compressed gas began to flow backward, the valve body 28 contacted the valve seat portion 31, and the valve was closed as shown in FIG. It becomes a state.
As described above, the valve device 10 is configured so that the dry compressed gas in the gas tank 7 flows back through the valve for a predetermined time (for example, 30 seconds) as the air feed time adjustment function.

  In this embodiment, by attaching the piston cup 21 to the piston 14 in a predetermined direction, the amount of gas per unit time that flows into the valve device 10 from the second flow path 32 is the above-described configuration (FIG. 6 ( (A) (see (B)) is configured to be larger than this, but is not limited thereto. As a technical idea, in addition to the piston cup 21, the valve device 10 may include a third flow path 33 and a second check valve 29 on the third flow path 33. In the present embodiment, the piston cup 21 is used by changing the O-ring 46 (see FIGS. 6A and 6B) having the above-described configuration to the piston cup 21, and the third flow path 33 and the third flow path. This is because the same effect as the configuration having the second check valve 29 on 33 can be obtained.

  An air dryer regeneration valve device 10 according to the present embodiment includes a drying unit 5 that performs a drying process of compressed gas supplied from a compressor 2 that is a gas compressor, and a gas tank 7 that stores the dried compressed gas that has been dried. Between the chamber 11 on which the gas pressure acts and the piston 14 that moves in the chamber 11, and the one end side space (lower side in the figure) on the gas tank 7 side in the chamber 11, The other end side space (upper side in the figure) on the drying unit 5 side, the piston 14 provided in the drawing, and the piston 14 is moved to the one end side (lower side in the figure) to become a closed state, and the other end side ( The valve (28, 31) which is opened by moving to the upper side in the figure, the urging means 26 for urging the piston 14 in the closing direction of the valve (28, 31), and the piston 14 are formed, One end side space ( A first hole portion 16 which is a hole portion for flowing gas from one to the other according to the difference between the pressure of the gas in the middle lower side) and the pressure of the gas in the other end side space (upper side in the figure); The flow of gas from the other end side space (upper side in the figure) of the chamber 11 toward the one end side space (lower side in the figure) is allowed, and the other end side from the one end side space (lower side in the figure). And a third flow path 33 as an auxiliary flow path having a second check valve 29 as a restriction means for restricting the flow of gas in the space (upper side in the figure) direction. To do.

  Further, in the present embodiment, the third flow path 33 is formed by a clearance between the outer peripheral surface of the flange portion of the piston 14 and the inner peripheral surface of the chamber 11, and the restricting means (the second check valve 29 includes Equivalent) is opened by elastic deformation in which the opening 25 which is an opening in the groove portion 19 as a recess formed along the outer peripheral surface of the flange portion is accommodated so as to face the one end side space (lower side in the figure). When the gas flows into the one end side space (lower side in the figure) from the other end side space (upper side in the figure) in the chamber 11, the first cup 25 is constituted by the piston cup 21 as a cup seal 25 that expands and contracts. In addition to the hole portion 16, the opening 25 of the piston cup 21 is reduced to open the clearance, whereby the one end side space (lower side in the figure) via the third flow path 33. When gas flows in and gas flows out from the one end side space (lower side in the figure) to the other end side space (upper side in the figure) in the chamber 11, the opening 25 of the piston cup 21 is enlarged and the clearance is closed. By doing so, the gas flows out to the other end side space (upper side in the figure) only through the first hole portion 16.

  Furthermore, in the present embodiment, gas is sent from the drying unit 5 to the other end side space (upper side in the figure) in the chamber 11, and the gas sent to the other end side space (upper side in the figure) 11 and flows into the one end side space (lower side in the figure) in the chamber 11 and the pressure in the one end side space (lower side in the figure) in the chamber 11 is increased, so that the pressure becomes the biasing force of the biasing means 26. On the contrary, the piston 14 is moved to the other end side (upper side in the figure), and the movement of the piston 14 opens the valves (28, 31), and the one end side space in the chamber 11 (lower side in the figure). ) Flows out to the other end side space (upper side in the figure) through the first hole portion 16, and the pressure of the one end side space (lower side in the figure) in the chamber 11 is caused by the outflow of the gas. By lowering, the biasing force of the biasing means 26 causes the piston 14 to Is moved to the end side (lower side in the figure), the movement of the piston 14, the valve (28, 31) is characterized in that it is a configuration in which the closed state.

  The air dryer of this example is an air dryer including a drying unit 5 having a recyclable desiccant 6 and a regeneration valve device 10 connected to one end side of a flow path in the drying unit 5, A compressor 2 and an exhaust valve 3 as a gas discharge unit are connected to the other end side of the flow path in the drying unit 5, and gas is supplied by the compressor 2 to the first hole 16 and the third hole of the regeneration valve device 10. By being sent to the one end side space (lower side in the figure) in the chamber 11 through the flow path 33, the valves (28, 31) of the regeneration valve device 10 are opened, and the exhaust valve 3 is opened to the atmosphere. As a result, the dry compressed gas in the gas tank 7 is sent to the drying section 5 through the valves (28, 31) of the regeneration valve device 10 and is discharged from the exhaust valve 3. Characterized in that it is a configuration that.

  The present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the invention described in the claims, and these are also included in the scope of the present invention. Needless to say.

1 Air treatment system, 2 Compressor, 3 Exhaust valve,
4 Silencer, 5 Drying part (Air dryer), 6 Desiccant, 7 Gas tank,
8 First check valve, 10 valve device (air feed time adjusting device),
11 chamber, 12 first sliding surface, 13 second sliding surface, 14 piston,
15 shaft portion, 16 first hole portion, 17 second hole portion, 19 groove portion, 20 O-ring,
21 piston cup, 24 sealing part, 25 opening, 26 biasing means,
27 compression coil spring, 28 valve body, 29 second check valve, 30 first flow path,
31 valve seat, 32 second flow path, 33 third flow path,
40 (problem) valve device, 41 piston, 42 hole,
43 chamber, 44 valve section, 45 compression coil spring, 46 O-ring,
47 1st flow path, 48 2nd flow path, 49 Valve seat part

Claims (4)

A chamber that is provided between a drying unit that performs a drying process of the compressed gas supplied from the gas compressor, and a gas tank that stores the dried compressed gas that has been subjected to the drying process;
A piston that moves in the chamber, and a piston that divides the chamber into the one end side space on the gas tank side and the other end side space on the drying unit side;
A valve that is closed when the piston moves toward the one end, and an open state when moved toward the other end;
Biasing means for biasing the piston in a direction in which the valve is closed;
A hole that is formed in the piston and allows gas to flow from one to the other according to the difference between the pressure of the gas in the one end side space and the pressure of the gas in the other end side space;
The flow path has restriction means for allowing a gas flow from the other end side space of the chamber toward the one end side space direction and restricting a gas flow from the one end side space toward the other end side space. An auxiliary flow path,
An air dryer regeneration valve device characterized by the above. The regeneration valve device for an air dryer according to claim 1, wherein the auxiliary flow path is formed by a clearance between an outer peripheral surface of a flange portion of the piston and an inner peripheral surface of the chamber.
The restricting means is configured by a cup seal in which the opening is accommodated in a recess formed along the outer peripheral surface of the flange portion so that the opening faces the one end side space, and the opening is enlarged and reduced by elastic deformation. ,
When the gas flows from the other end side space into the one end side space in the chamber, in addition to the hole portion, the opening portion of the cup seal is reduced and the clearance is opened, so that the auxiliary flow path is reduced. Gas flows into the one end side space through,
When the gas flows out from the one end side space to the other end side space in the chamber, the opening of the cup seal is enlarged and the clearance is closed, so that the other end side only through the hole. It has a configuration that allows gas to flow into the space.
An air dryer regeneration valve device characterized by the above. 3. The valve device according to claim 1, wherein gas is sent from the drying section to the other end side space in the chamber, and the gas sent to the other end side space is the one end side in the chamber. Flow into the space,
By increasing the pressure in the one end side space in the chamber, the pressure moves the piston to the other end side against the urging force of the urging means,
The movement of the piston causes the valve to be in the open state,
The gas in the one end side space in the chamber flows out to the other end side space through the hole, and the outflow of the gas lowers the pressure in the one end side space in the chamber. The urging force of the urging means moves the piston to the one end side,
A valve device for regenerating an air dryer, wherein the valve is in the closed state by movement of the piston. A drying section having a renewable desiccant;
A regeneration valve device connected to one end of the flow path in the drying section, and an air dryer comprising:
The regeneration valve device is the regeneration valve device according to any one of claims 1 to 3,
A gas compressor and a gas discharge unit are connected to the other end side of the flow path in the drying unit,
Gas is sent by the gas compressor to the one end side space in the chamber through the hole of the regeneration valve device and the auxiliary flow path, so that the valve of the regeneration valve device is opened. ,
When the gas discharge unit is opened to the atmosphere, the dry compressed gas in the gas tank is sent to the drying unit via the valve of the regeneration valve device and discharged from the gas discharge unit. An air dryer.

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