JPWO2016190389A1 - Snap mechanism and liquid pumping device - Google Patents

Abstract

In the snap mechanism, the snap operation force is effectively increased. The snap mechanism (60) has a depression (67b) on the side surface and moves in the axial direction by an external force, and is arranged on the side of the trigger rod (67) toward the depression (67b). A snap rod (64) having a holding hole (64c) that opens, and a hold pin that holds the snap rod (64) by entering the holding hole (64c) provided so as to be able to advance and retreat toward the holding hole (64c). 62) and a trigger ball (not shown) that is disposed inside the holding hole (64c) and is pushed by the movement of the trigger rod (67) to push the hold pin (62) in the backward direction to release the snap rod (64). 65), and the trigger rod (67) is elastically deformed with the movement of the snap rod (64). And a coil spring (68, 69) for moving the prods (64).

Description

  The present application relates to a snap mechanism and a liquid pumping device including the snap mechanism.

  2. Description of the Related Art Conventionally, a snap mechanism is known as a mechanism for causing an abrupt operation (snap operation) to be performed when an actuating member that operates gently reaches a predetermined operating position. For example, Patent Literature 1 discloses a liquid pumping device provided with the above-described snap mechanism. This liquid pumping device includes a sealed container in which drain generated in the steam system flows and is stored, and a steam (working gas) supply valve provided in the sealed container. In this liquid pumping apparatus, a float is accommodated in a sealed container, and a power transmission shaft that moves in the axial direction as the float moves up and down snaps (snaps) by a snap mechanism. The supply valve is opened and closed by the snap operation of the power transmission shaft. When the air supply valve is opened, steam is introduced into the sealed container, and the drain stored in the sealed container is pushed downward by the pressure of the steam and discharged from the discharge port. In this way, the drain is pumped to the user by the steam pressure.

  The snap mechanism includes a cylindrical member attached to the outer periphery of the power transmission shaft, and a locking member provided on a side of the cylindrical member. Two grooves are sequentially provided in the axial direction on the outer peripheral surface of the cylindrical member. The locking member is biased toward the outer peripheral surface of the tubular member, and the end portion is in one of the grooves (upper side) of the tubular member. In the snap mechanism, when the float rises, the cylindrical member moves upward together with the power transmission shaft. Due to the movement of the tubular member, the locking member is gradually pushed outward and comes out of the upper groove of the tubular member. Here, when the locking member starts to be pushed outward, the locking member becomes a resistance against the movement of the power transmission shaft (tubular member), so that the buoyancy of the float is increased by the moving force of the power transmission shaft (increase). Power). When the locking member comes out of the groove of the cylindrical member, the resistance to the movement of the power transmission shaft is lost, and thus the stored moving force is released at once. As a result, the power transmission shaft (cylindrical member) suddenly moves upward (snap operation) and the air supply valve is opened, while the locking member enters the lower groove of the cylindrical member by the biasing force. .

JP-A-11-236997

  However, the above-described snap mechanism cannot sufficiently use the stored force (moving force), and therefore the snap operation force is relatively weak and there is room for improvement. In other words, the inclination of the tangent of the contact portion of the locking member with the groove changes so as to approach the vertical direction (the axial direction of the power transmission shaft) from when the locking member starts to be pushed out of the groove. Therefore, the resistance force of the locking member with respect to the movement of the power transmission shaft decreases, and the force stored when the locking member starts to be pressed decreases. Therefore, when the locking member comes out of the groove, almost no accumulated force remains, and the snap operation force becomes weak. That is, since the stored force cannot be used effectively, the snap operation force cannot be earned. For this reason, the force for opening and closing the supply valve may be insufficient.

  The technology disclosed in the present application has been made in view of such circumstances, and an object thereof is to effectively increase the snap operation force in the snap mechanism.

  In order to achieve the above object, the technology disclosed in the present application stores an external force applied to the drive shaft member as an elastic force (elastic energy) in the elastic member, and causes the driven shaft member to snap by the stored elastic force. I made it.

  Specifically, the snap mechanism of the present application includes a drive shaft member, a driven shaft member, a holding member, a release member, and an elastic member. The drive shaft member has a recessed portion on the side surface and moves in the axial direction by an external force. The driven shaft member is disposed on the side of the drive shaft member so as to extend in the axial direction of the drive shaft member, and has a holding hole that opens toward the recess. The holding member is provided so as to be able to advance and retreat from the side of the driven shaft member toward the holding hole, and holds the driven shaft member by entering the holding hole. The release member is disposed inside the holding hole in a state where a part of the release member is located in the recess. The release member is pushed toward the holding member by the movement of the hollow portion accompanying the movement of the drive shaft member, thereby pushing the holding member in the backward direction to release the holding of the driven shaft member. The elastic member is provided between the drive shaft member and the driven shaft member. The elastic member is elastically deformed with the movement of the drive shaft member, and when the holding of the driven shaft member is released, the driven shaft member is moved in the axial direction by an elastic force.

  Moreover, the liquid pumping device of the present application includes a casing, an air supply valve, and a valve operating mechanism. The casing has a liquid storage space formed therein, and has a working gas inlet for introducing the working gas into the storage space and discharging the liquid in the storage space. The air supply valve opens and closes the introduction port. The valve operating mechanism has a float arranged in the storage space, and opens and closes the air supply valve by raising and lowering the float.

  Furthermore, the valve operating mechanism includes the above-described snap mechanism, a power transmission shaft, and a valve operating shaft. The power transmission shaft is connected to the drive shaft member of the snap mechanism, and moves the drive shaft member by a lifting and lowering force of the float. The valve operating shaft is connected to the driven shaft member of the snap mechanism, and opens and closes the air supply valve by movement of the driven shaft member.

  As described above, according to the snap mechanism of the present application, since the elastic member that elastically deforms with the movement of the drive shaft member is provided, the external force acting through the drive shaft member is applied to the elastic member as an elastic force (elastic energy). Can be stored reliably. When the driven shaft member is released, the driven shaft member is moved by the elastic force of the elastic member, so that the driven shaft member snaps using the force (elastic force) stored in the elastic member. Can be made. Thereby, the snap operation force of the driven shaft member can be effectively increased.

  Further, according to the liquid pumping device of the present application, the power transmission shaft that is connected to the drive shaft member of the snap mechanism described above and moves the drive shaft member by the lifting and lowering force of the float is provided. Can be stored in the elastic member as an elastic force (elastic energy). And since it connected with the driven shaft member of the snap mechanism mentioned above, and provided with the valve operating shaft which opens and closes an air supply valve by movement of this driven shaft member, the force (elastic force) stored in the elastic member is used. Thus, the valve operating shaft can be snapped. Thereby, since the force which opens and closes an air supply valve can be increased, the opening and closing operation of an air supply valve can be performed reliably.

FIG. 1 is a cross-sectional view illustrating a schematic configuration of the liquid pumping apparatus according to the first embodiment. FIG. 2 is an enlarged cross-sectional view of the schematic configuration of the air supply valve and the exhaust valve. FIG. 3 is an enlarged cross-sectional view illustrating a schematic configuration of the valve operating mechanism according to the first embodiment. FIG. 4 is a cross-sectional view illustrating one operation state of the snap mechanism according to the first embodiment. FIG. 5 is a view corresponding to FIG. 4 illustrating another operation state of the snap mechanism according to the first embodiment. FIG. 6 is a view corresponding to FIG. 4 illustrating another operation state of the snap mechanism according to the first embodiment. FIG. 7 is a view corresponding to FIG. 4 illustrating another operation state of the snap mechanism according to the first embodiment. FIG. 8 is a view corresponding to FIG. 4 illustrating another operation state of the snap mechanism according to the first embodiment. FIG. 9 is a view corresponding to FIG. 4 illustrating another operation state of the snap mechanism according to the first embodiment. FIG. 10 is a cross-sectional view illustrating a schematic configuration of the valve operating mechanism according to the second embodiment. FIG. 11 is a cross-sectional view illustrating one operation state of the snap mechanism according to the second embodiment. FIG. 12 is a view corresponding to FIG. 11 illustrating another operation state of the snap mechanism according to the second embodiment. FIG. 13 is a view corresponding to FIG. 11 illustrating another operation state of the snap mechanism according to the second embodiment. FIG. 14 is a view corresponding to FIG. 11 illustrating another operation state of the snap mechanism according to the second embodiment. FIG. 15 is a view corresponding to FIG. 11 illustrating another operation state of the snap mechanism according to the second embodiment. FIG. 16 is a view corresponding to FIG. 11 illustrating another operation state of the snap mechanism according to the second embodiment.

  Hereinafter, embodiments of the present application will be described with reference to the drawings. Note that the following embodiments are essentially preferable examples, and are not intended to limit the scope of the technology disclosed in the present application, applications thereof, or uses thereof.

(Embodiment 1)
Embodiment 1 of the present application will be described with reference to FIGS. The liquid pumping apparatus 1 of this embodiment is provided in, for example, a steam system, and collects drain (condensate) generated by steam condensation and pumps it to a boiler or a waste heat utilization apparatus. That is, in this embodiment, the drain corresponds to the liquid according to the claims of the present application. As shown in FIG. 1, the liquid pumping apparatus 1 includes a casing 10 that is a sealed container, three valve mechanisms (a discharge valve 20, an air supply valve 30, and an exhaust valve 40), and a valve operating mechanism 50. . The valve operating mechanism 50 is provided with a snap mechanism 60 according to the claims of the present application.

  In the casing 10, the main body portion 11 and the lid portion 12 are coupled by a bolt, and a drain (liquid) storage space 13 is formed therein. The lid 12 is provided with a liquid inlet 14 through which drain flows, a liquid outlet 15 through which drain is discharged, a steam inlet 16 through which steam is introduced, and a steam outlet 17 through which steam is discharged. It has been. In this embodiment, steam corresponds to the working gas according to the claims of the present application. The liquid inflow port 14 is provided near the upper part of the lid part 12, and the liquid discharge port 15 is provided at the lower part of the lid part 12. Both the steam inlet 16 and the steam outlet 17 are provided in the upper part of the lid 12. These liquid inlets 14 and the like are all in communication with the storage space 13.

  The liquid discharge port 15 is provided with a discharge valve 20, the steam introduction port 16 is provided with an air supply valve 30, and the vapor discharge port 17 is provided with an exhaust valve 40. The discharge valve 20, the air supply valve 30, and the exhaust valve 40 open and close the liquid discharge port 15, the vapor introduction port 16, and the vapor discharge port 17, respectively.

  The discharge valve 20 includes a valve case 21, a valve body 22, and a lifting rod 23. The valve case 21 has an internal space that communicates with the liquid discharge port 15. The valve case 21 is formed with two openings 24 that are positioned one above the other and communicate with the internal space and the storage space 13. The valve body 22 is formed in a disc shape, and is provided integrally with the lifting rod 23. The elevating rod 23 is inserted into the two openings 24 of the valve case 21 so as to be movable up and down, and the two valve bodies 22 are arranged in the vertical direction. The discharge valve 20 is configured such that the lift rod 23 is raised and the valve body 22 closes the opening 24 to close the liquid discharge port 15. The lift rod 23 is lowered and the valve body 22 opens the opening 24 to discharge the liquid. The outlet 15 is opened.

  As shown in FIG. 2, the air supply valve 30 includes a valve case 31, a valve body 32, and a lifting rod 33. The valve case 31 has a through hole in the axial direction, and a valve seat 34 is formed above the through hole. An opening 35 through which the through hole communicates with the storage space 13 is formed at an intermediate portion of the valve case 31. The valve body 32 is formed in a spherical shape and is disposed on the valve case 31. The elevating rod 33 is inserted into the through hole of the valve case 31 so as to be movable up and down. In the air supply valve 30, when the elevating rod 33 rises and pushes up the valve body 32, the valve body 32 is separated from the valve seat 34 and the steam inlet 16 is opened. Further, in the air supply valve 30, when the elevating rod 33 is lowered, the valve body 32 is seated on the valve seat 34 and the steam inlet 16 is closed.

  As shown in FIG. 2, the exhaust valve 40 includes a valve case 41, a valve body 42, and a lifting rod 43. The valve case 41 has a through hole in the axial direction, and a valve seat 44 is formed slightly above the through hole. The valve case 41 is formed with an opening 45 through which the through hole communicates with the storage space 13. The valve body 42 is formed in a substantially hemispherical shape, and is provided integrally with the upper end of the lifting rod 43. The elevating bar 43 is inserted into the through hole of the valve case 41 so as to be movable up and down. In the exhaust valve 40, the valve body 42 is seated on the valve seat 34 when the elevating rod 43 is raised, the steam discharge port 17 is closed, and the valve body 42 is separated from the valve seat 34 when the elevating rod 43 is lowered. Then, the steam outlet 17 is opened.

  The valve operating mechanism 50 includes a float 51, two valve operating shafts 55 and 75, a power transmission shaft 57, and a snap mechanism 60. The valve operating mechanism 50 operates the two valve operating shafts 55 and 75 by raising and lowering (ups and downs) of the float 51 to open and close the exhaust valve 20, the air supply valve 30, and the exhaust valve 40 described above.

  The float 51 is formed in a spherical shape, and the float arm 52 is connected thereto. The float 51 is arranged in the storage space 13 and moves up and down according to the drain water level in the storage space 13. The float arm 52 is rotatably supported on a shaft 53 provided on the bracket 54. With this configuration, the float arm 52 swings about the shaft 53 as the float 51 moves up and down. One end (upper end) of the valve operating shaft 55 is rotatably connected to the float arm 52 by a shaft 56a, and the other end (lower end) of the valve operating shaft 55 is rotatably connected to the end of the lifting / lowering rod 23 of the discharge valve 20 by a shaft 56b. Yes. One end of the valve operating shaft 55 is connected to the float arm 52 on the opposite side of the shaft 53 from the float 51 side. The valve operating shaft 55 is displaced as the float arm 52 swings, and moves the elevating rod 23 of the discharge valve 20 up and down. That is, the valve operating shaft 55 opens and closes the discharge valve 20 by raising and lowering the float 51.

  The power transmission shaft 57 and the valve operating shaft 75 are connected via a snap mechanism 60. As shown in FIGS. 2 and 3, the power transmission shaft 57 is provided so as to extend in the vertical direction. The power transmission shaft 57 has one end (upper end) connected to the snap mechanism 60 and the other end (lower end) connected to the float arm 52 by a shaft 58. The other end of the power transmission shaft 57 is connected to the float 51 side with respect to the shaft 53 in the float arm 52. A hole 59 having an inner diameter larger than the outer diameter of the shaft 58 is formed in the float arm 52, and the shaft 58 is inserted into the hole 59 to connect the power transmission shaft 57. The power transmission shaft 57 moves up and down as the float arm 52 swings as the float 51 moves up and down. That is, the power transmission shaft 57 moves in both axial directions as the float 51 moves up and down. The power transmission shaft 57 is configured to operate the snap mechanism 60 by moving up and down.

  On the other hand, the valve operating shaft 75 is a cylindrical shaft and is provided so as to extend in the vertical direction. The power transmission shaft 57 is inserted into the valve operating shaft 75, and the power transmission shaft 57 and the valve operating shaft 75 are provided coaxially with each other. One end (upper end) of the valve operating shaft 75 is connected to the snap mechanism 60, and the other end (lower end) is coupled to the push-up rod 77 via the connection shaft 76. The push-up bar 77 is provided in a state extending in the horizontal direction, and a connecting shaft 76 is coupled to the center thereof. The push-up rod 77 is provided with push-up portions 78 and 79 having a substantially rectangular shape on both sides of the connection shaft 76. The two push-up portions 78 and 79 are integrally provided with a lifting rod 43 of the exhaust valve 40 and a lifting rod 33 of the air supply valve 30, respectively.

  The valve operating shaft 75 is configured to move up and down (moves in both directions in the axial direction) by the operation of the snap mechanism 60. The push-up bar 77 moves up and down together with the valve operating shaft 75 to move the lift bars 33 and 43 of the air supply valve 30 and the exhaust valve 40 up and down. When the push-up rod 77 rises, the lift rods 33 and 43 rise together with the push-up portions 78 and 79, and the air supply valve 30 opens and the exhaust valve 40 closes. When the push-up rod 77 is lowered, the lift rods 33 and 43 are lowered together with the push-up portions 78 and 79, the air supply valve 30 is closed, and the exhaust valve 40 is opened. That is, the valve operating shaft 75 is configured to open and close the air supply valve 30 and the exhaust valve 40 by moving up and down by the snap mechanism 60. The configuration and operation of the snap mechanism 60 will be described later.

  In the liquid pressure feeding device 1, the float 51 is located at the bottom of the storage space 13 when the drain does not collect in the storage space 13. In this state, the valve operating shaft 75 and the push-up rod 77 are lowered, the air supply valve 30 is closed, and the exhaust valve 40 is open. On the other hand, the valve operating shaft 55 is raised, and the discharge valve 20 is closed. When drain is generated in the steam system, the drain flows from the liquid inlet 14 and accumulates in the storage space 13. As the drain accumulates in the storage space 13, the float 51 rises. As the float 51 rises, the power transmission shaft 57 rises and the valve operating shaft 55 falls. When the valve operating shaft 55 is lowered, the discharge valve 20 is opened. In the storage space 13, the steam is discharged from the steam discharge port 17 as the drain accumulates. When the drain water level in the storage space 13 reaches a predetermined high water level, the valve operating shaft 75 is raised by the snap mechanism 60. Thereby, the air supply valve 30 is opened and the exhaust valve 40 is closed.

  When the air supply valve 30 is opened, steam (high-pressure steam) in the steam system flows from the steam inlet 16 and is introduced into the upper part of the storage space 13 (the upper space of the drain). Then, the drain accumulated in the storage space 13 is pushed downward by the pressure of the introduced steam and discharged from the liquid discharge port 15. That is, the drain of the storage space 13 is pumped. The drain pumped by the liquid pumping apparatus 1 is supplied to a boiler or a waste heat utilization apparatus. When the drain water level in the storage space 13 is lowered due to the drainage, the float 51 is lowered. As the float 51 is lowered, the power transmission shaft 57 is lowered and the valve operating shaft 55 is raised. When the drain water level in the storage space 13 reaches a predetermined low water level, the valve operating shaft 75 is lowered by the snap mechanism 60. Thereby, the air supply valve 30 is closed and the exhaust valve 40 is opened. Then, the float 51 further descends, and the discharge valve 20 is closed by further raising the valve operating shaft 55.

<Configuration of snap mechanism>
The snap mechanism 60 is operated by the vertical movement of the power transmission shaft 57, and causes the valve operating shaft 75 to snap in the vertical direction (snap movement). That is, the snap mechanism 60 transmits the ascending force (buoyancy) and the descending force (self-weight) of the float 51 by the power transmission shaft 57 to cause the valve operating shaft 75 to snap. As shown in FIG. 1, the snap mechanism 60 is provided outside the casing 10 and is covered with a cap 18.

  As shown in FIG. 4, the snap mechanism 60 includes a case 61, a hold pin 62, a snap rod 64, trigger balls 65 and 66, a trigger rod 67, and coil springs 68 and 69. The case 61 is formed in a cylindrical shape extending in the vertical direction, and is held on the inner surface of the cap 18. The snap rod 64, the trigger rod 67 and the coil springs 68 and 69 are provided in the case 61.

  The trigger rod 67 is a shaft member formed in a cylindrical shape having a smaller diameter than the case 61, and is attached (connected) to the power transmission shaft 57 in the case 61. That is, the upper end of the power transmission shaft 57 is inserted into the case 61. The power transmission shaft 57 has a main shaft portion 57a, and an insertion portion 57b and an end portion 57c are sequentially formed at the upper end of the main shaft portion 57a. The main shaft portion 57 a is a portion that is connected to the float arm 52 and is a portion that is inserted into the valve operating shaft 75. The insertion portion 57b is formed to have a smaller diameter than the main shaft portion 57a and the end portion 57c, and the trigger rod 67 is inserted and attached. The outer diameter of the insertion portion 57 b is slightly smaller than the inner diameter of the trigger rod 67, and the outer diameters of the main shaft portion 57 a and the end portion 57 c are larger than the inner diameter of the trigger rod 67. The length of the insertion portion 57 b is longer than the trigger rod 67.

  The trigger rod 67 moves in the vertical direction by the vertical movement of the power transmission shaft 57. That is, the trigger rod 67 is a drive shaft member that moves in both axial directions by an external force. Further, the power transmission shaft 57 is connected to the trigger rod 67 and moves the trigger rod 67 by the lifting and lowering force of the float 51. The trigger rod 67 has two hollow portions 67b and 67c on the outer peripheral surface (side surface). The two depressions 67b and 67c are provided in order in the axial direction of the trigger rod 67, and each is provided over the circumferential direction. A portion where the two recessed portions 67b and 67c are connected to each other is a peak portion 67a. In the recesses 67b and 67c, the upper and lower edges are inclined.

  The snap rod 64 is a cylindrical shaft member that has a smaller diameter than the case 61 and extends in the vertical direction, and is inserted into the case 61 so as to be movable up and down. A trigger rod 67 is inserted into the snap rod 64 so as to be movable up and down. That is, the snap rod 64 is a driven shaft member that extends in the axial direction of the trigger rod 67 on the side of the trigger rod 67. The snap rod 64 is longer than the trigger rod 67.

  The snap rod 64 has two holding holes 64c and 64d (provided in order in the axial direction) vertically. In addition, the two mentioned here mean two of the upper holding hole 64c and the lower holding hole 64d. The holding holes 64 c and 64 d penetrate the snap rod 64 in the radial direction. Note that a plurality of (for example, four) upper holding holes 64c and a lower holding hole 64d are provided in the circumferential direction. The upper holding hole 64c and the lower holding hole 64d open toward the recesses 67b and 67c of the trigger rod 67, respectively. The holding holes 64c and 64d have groove portions 64a and 64b. The groove portions 64a and 64b are provided at the outer opening edge portions in the holding holes 64c and 64d. That is, two grooves 64 a and 64 b are provided on the outer peripheral surface (side surface) of the snap rod 64 in the vertical direction.

  The hold pin 62 is formed in a cylindrical shape, and is inserted into the opening 61 a penetrating in the radial direction in the case 61. One hold pin 62 is provided in the vertical direction of the case 61. A plurality of (for example, four) hold pins 62 are provided in the circumferential direction of the case 61. The hold pin 62 is a holding member that is provided so as to be able to advance and retract from the side of the snap rod 64 toward the holding holes 64c and 64d, and holds the snap rod 64 by entering the holding holes 64c and 64d. Specifically, the hold pin 62 is provided so as to be movable in the radial direction of the case 61 and is urged in the forward direction (that is, inward in the radial direction of the case 61) by a ring spring 63 (elastic member). The hold pin 62 moves forward and enters the grooves 64 a and 64 b of the holding holes 64 c and 64 d in the snap rod 64 to hold the snap rod 64. That is, the vertical movement of the snap rod 64 is blocked by the hold pin 62.

  The trigger balls 65 and 66 are formed in a spherical shape, and are provided one by one inside the holding holes 64 c and 64 d of the snap rod 64. The trigger balls 65 and 66 are disposed in the holding holes 64 c and 64 d in a state where a part of the trigger balls 65 and 66 is located in the recesses 67 b and 67 c of the trigger rod 67. The trigger balls 65 and 66 are pushed toward the hold pin 62 by the vertical movement (movement) of the recesses 67b and 67c accompanying the vertical movement (movement) of the trigger rod 67, thereby moving the hold pin 62 in the backward direction (that is, the case). It is a release member that releases the holding of the snap rod 64 by pushing it radially outward (61).

  Two coil springs 68 and 69 are provided above and below the trigger rod 67 inside the snap rod 64. That is, one coil spring 68 and 69 is provided at each end of the trigger rod 67 in the axial direction. One end (upper end) of the upper coil spring 68 is supported by the snap ring 71 provided on the inner peripheral surface of the snap rod 64, and the other end (lower end) is supported by the upper end surface of the trigger rod 67. The lower coil spring 69 has one end (upper end) supported by the lower end surface of the trigger rod 67 and the other end (lower end) supported by a step portion 64 e formed on the inner peripheral surface of the snap rod 64. Thus, the two coil springs 68 and 69 are provided between the trigger rod 67 and the snap rod 64, respectively.

  The coil springs 68 and 69 are elastically deformed as the trigger rod 67 is moved up and down (moved), and when the snap rod 64 is released by the trigger balls 65 and 66, the snap rod 64 is elastically generated by the elastic deformation. The elastic member is configured to move in the vertical direction (axial direction). That is, as the trigger rod 67 is raised, the upper coil spring 68 is compressed, and when the snap rod 64 is released, the snap rod 64 is raised (snapped upward) by the elastic force generated by the compression of the upper coil spring 68. Operate. When the trigger rod 67 is lowered, the lower coil spring 69 is compressed, and when the snap rod 64 is released, the snap rod 64 is lowered (downward) by the elastic force generated by the compression of the lower coil spring 69. Snap action).

  A valve operating shaft 75 is connected to the lower end of the snap rod 64 by a shaft 72. The valve operating shaft 75 moves up and down together with the snap rod 64. That is, the valve operating shaft 75 is connected to the snap rod 64 and opens and closes the air supply valve 30 and the exhaust valve 40 by the movement of the snap rod 64.

<Operation of snap mechanism>
In the snap mechanism 60, when the drain is not collected in the storage space 13 and the float 51 is located at the bottom of the storage space 13, the state shown in FIG. Specifically, the lower end surface of the trigger rod 67 is in contact with the main shaft portion 57 a of the power transmission shaft 57. The hold pin 62 is urged in the forward direction by the ring spring 63 and enters the upper groove 64 a of the snap rod 64. The upper trigger ball 65 is pushed by the hold pin 62 and enters the upper recessed portion 67 b of the trigger rod 67 to be in contact therewith. On the other hand, the lower trigger ball 66 is not in contact with the trigger rod 67. In this state, the snap rod 64 is held by the hold pin 62 and is prevented from moving up and down.

  Next, in the snap mechanism 60, when the float 51 rises as the drain flows and the power transmission shaft 57 rises, the state shown in FIG. 5 is obtained. Specifically, the trigger rod 67 is pushed up by the main shaft portion 57a of the power transmission shaft 57 and rises. As the trigger rod 67 rises, the upper trigger ball 65 is pushed outward while in contact with the recess 67b. That is, the trigger ball 65 is moved by being pushed toward the hold pin 62 by the inclined surface of the recess 67b. As a result, the hold pin 62 moves backward. When the trigger ball 65 comes into contact with the peak portion 67 a of the trigger rod 67, the hold pin 62 comes out of the groove portion 64 a of the snap rod 64. Thereby, holding | maintenance of the snap rod 64 is cancelled | released. On the other hand, the upper coil spring 68 is compressed as the trigger rod 67 rises. As a result, the lifting force (buoyancy) of the float 51 transmitted by the power transmission shaft 57 is stored in the upper coil spring 68 as an elastic force (elastic energy).

  When the holding of the snap rod 64 is released, the snap rod 64 rapidly rises (snap operation) by the elastic force of the upper coil spring 68 as shown in FIG. When the snap rod 64 rises, the hold pin 62 advances by the urging force of the ring spring 63 and enters the groove portion 64b below the snap rod 64. Thereby, the snap rod 64 is held again. The lower trigger ball 66 is pushed inward by the advance of the hold pin 62 and enters and contacts the lower recess 67 c of the trigger rod 67. Due to the rapid rise of the snap rod 64 described above, the valve operating shaft 75 also rises rapidly, and the intake valve 30 is reliably opened and the exhaust valve 40 is closed. Thereby, the drain of the storage space 13 is discharged.

  When the float 51 descends as the drain is discharged, the power transmission shaft 57 descends and the end portion 57c of the power transmission shaft 57 contacts the upper end surface of the trigger rod 67 as shown in FIG. When the float 51 further descends and the power transmission shaft 57 descends, the trigger rod 67 is pushed down by the end portion 57c of the power transmission shaft 57 and descends as shown in FIG. As the trigger rod 67 is lowered, the lower trigger ball 66 is pushed outward while in contact with the recess 67c. That is, the trigger ball 66 is pushed and moved toward the hold pin 62 by the inclined surface of the recess 67c. As a result, the hold pin 62 moves backward. When the trigger ball 66 comes into contact with the peak portion 67 a of the trigger rod 67, the hold pin 62 comes out of the groove portion 64 b of the snap rod 64. Thereby, holding | maintenance of the snap rod 64 is cancelled | released. On the other hand, the lower coil spring 69 is compressed as the trigger rod 67 descends. Thereby, the downward force (self-weight) of the float 51 transmitted by the power transmission shaft 57 is stored in the lower coil spring 69 as an elastic force (elastic energy).

  When the holding of the snap rod 64 is released, as shown in FIG. 9, the snap rod 64 is rapidly lowered (snap operation) by the elastic force of the lower coil spring 69. When the snap rod 64 is lowered, the hold pin 62 is advanced by the urging force of the ring spring 63 and enters the upper groove portion 64 a of the snap rod 64. Thereby, the snap rod 64 is held again. Thus, in the snap mechanism 60, when the snap rod 64 is moved by the coil springs 68 and 69, the hold pin 62 enters the holding hole on the opposite side to the moving direction of the snap rod 64 of the two holding holes 64c and 64d. The snap rod 64 is held. The upper trigger ball 65 is pushed inward by the advance of the hold pin 62 and enters the upper recess 67b of the trigger rod 67 again to come into contact therewith. Due to the rapid lowering of the snap rod 64 described above, the valve operating shaft 75 is also rapidly lowered, and the air supply valve 30 is reliably closed and the exhaust valve 40 is opened.

  As described above, according to the snap mechanism 60 of the above embodiment, the coil springs 68 and 69 that are elastically deformed with the movement of the trigger rod 67 are provided. Therefore, the external force acting through the trigger rod 67 is converted into an elastic force (elastic energy). ) Can be reliably stored in the coil springs 68 and 69. According to the snap mechanism 60 of the above-described embodiment, when the snap rod 64 is released, the snap rod 64 is moved by the elastic force of the coil springs 68 and 69, and thus stored in the coil springs 68 and 69. The snap rod 64 can be snapped using force (elastic force). Thereby, the snap operation force of the snap rod 64 can be increased effectively.

  In addition, according to the snap mechanism 60 of the above-described embodiment, the two coil springs 68 and 69 are provided so that the force is stored when the trigger rod 67 is raised and the force is stored when the trigger rod 67 is lowered. did. Therefore, the external force can be reliably stored as an elastic force both when the trigger rod 67 is raised and lowered.

  Further, according to the liquid pressure feeding device 1 of the above-described embodiment, the power transmission shaft 57 that is connected to the trigger rod 67 of the snap mechanism 60 and moves the trigger rod 67 by the lifting and lowering force of the float 51 is provided. The force by which 51 moves up and down can be stored in the coil springs 68 and 69 as elastic force (elastic energy). Since the valve operating shaft 75 is connected to the snap rod 64 of the snap mechanism 60 and opens and closes the supply valve 30 and the exhaust valve 40 by the movement of the snap rod 64, the force stored in the coil springs 68 and 69 is provided. The valve operating shaft 75 can be snapped using (elastic force). Thereby, since the force which opens and closes the air supply valve 30 and the exhaust valve 40 can be increased, opening / closing operation | movement of the air supply valve 30 grade | etc., Can be performed reliably.

  Further, according to the liquid pressure feeding device 1 of the above embodiment, since the power transmission shaft 57 is inserted into the valve operating shaft 75 so as to be individually movable up and down, the power transmission shaft 57 and the valve operating shaft 75 are provided. Installation space can be reduced. Thereby, size reduction of the liquid pumping apparatus 1 can be achieved.

(Embodiment 2)
A second embodiment of the present application will be described with reference to FIGS. In the present embodiment, the configuration of the snap mechanism in the first embodiment is changed. Here, differences from the first embodiment will be described.

  As in the first embodiment, the snap mechanism 80 according to the present embodiment operates by the vertical movement of the power transmission shaft 57, and causes the valve operating shaft 95 to snap (move) in the vertical direction. As shown in FIGS. 10 and 11, the snap mechanism 80 includes a case 81, hold pins 82 and 83, a snap rod 85, a trigger ball 86, a trigger rod 87, and coil springs 88 and 89. . The case 81 is formed in a cylindrical shape extending in the vertical direction and is held on the inner surface of the cap 18. The snap rod 85, the trigger rod 87 and the coil springs 88 and 89 are provided in the case 81.

  The trigger rod 87 is a shaft member formed in a cylindrical shape as in the first embodiment, and is inserted into (attached to) the insertion portion 57 b of the power transmission shaft 57 in the case 81. The trigger rod 87 is a drive shaft member that moves in the vertical direction by the vertical movement of the power transmission shaft 57. The trigger rod 87 has one recess 87a on the outer peripheral surface (side surface). The recess 87 a is provided over the circumferential direction of the trigger rod 87. In the recess 87a, the upper part and the lower part are inclined.

  Similar to the first embodiment, the snap rod 85 is a cylindrical shaft member extending in the vertical direction, and is inserted into the case 81 so as to be vertically movable. A trigger rod 87 is inserted into the snap rod 85 so as to be movable up and down. The snap rod 85 has one holding hole 85a in the vertical direction (axial direction). The holding hole 85a penetrates the snap rod 85 in the radial direction. A plurality of (for example, four) holding holes 85a are provided in the circumferential direction. The holding hole 85a opens toward the recess 87a of the trigger rod 87.

  The hold pins 82 and 83 are formed in a cylindrical shape, and two are provided in the vertical direction of the case 81. The two hold pins 82 and 83 are inserted into openings 81a and 81b penetrating in the radial direction in the case 81, respectively. Note that a plurality of (for example, four) upper hold pins 82 and lower hold pins 83 are provided in the circumferential direction of the case 81. The hold pins 82 and 83 are holding members provided to be able to advance and retract from the side of the snap rod 85 toward the holding hole 85a. Specifically, the upper hold pin 82 and the lower hold pin 83 are provided so as to be movable in the radial direction of the case 81, and are moved forward by the ring springs 84 (elastic members) provided two vertically. , Radially inward of the case 81). The hold pins 82 and 83 move forward and enter the holding hole 85 a in the snap rod 85 to hold the snap rod 85. That is, the vertical movement of the snap rod 85 is prevented by the hold pins 82 and 83.

  The trigger balls 86 are formed in a spherical shape, and are provided one by one inside the four holding holes 85 a of the snap rod 85. The trigger ball 86 is disposed in the holding hole 85 a in a state where a part of the trigger ball 86 is located in the recess 87 a of the trigger rod 87. The trigger ball 86 is pushed toward the hold pins 82 and 83 by the vertical movement (movement) of the hollow portion 87a accompanying the vertical movement (movement) of the trigger rod 87, thereby moving the hold pins 82 and 83 in the backward direction (that is, the case). 81 is a release member that releases the holding of the snap rod 85 by pushing it radially outward (81).

  As with the first embodiment, two coil springs 88 and 89 are provided above and below the trigger rod 87 inside the snap rod 85. That is, one coil spring 88 and 89 is provided at each end of the trigger rod 87 in the axial direction. One end (upper end) of the upper coil spring 88 is supported by the snap ring 91 provided on the inner peripheral surface of the snap rod 85, and the other end (lower end) is supported by the upper end surface of the trigger rod 87. The lower coil spring 89 has one end (upper end) supported by the lower end surface of the trigger rod 87 and the other end (lower end) supported by a step portion 85 b formed on the inner peripheral surface of the snap rod 85. Thus, the two coil springs 88 and 89 are provided between the trigger rod 87 and the snap rod 85, respectively.

  Also in the present embodiment, the coil springs 88 and 89 are elastically deformed as the trigger rod 87 moves up and down, and when the snap rod 85 is released by the trigger ball 86, the elastic force generated by the elastic deformation is generated. This constitutes an elastic member that moves the snap rod 85 in the vertical direction (axial direction). A valve operating shaft 95 is connected to the lower end of the snap rod 85 by a shaft 92. Similar to the first embodiment, the valve operating shaft 95 is connected to the push-up rod 77 via the connecting shaft 76 and moves up and down together with the snap rod 85 to open and close the air supply valve 30 and the exhaust valve 40.

  In the snap mechanism 80, when the drain is not accumulated in the storage space 13 and the float 51 is located at the bottom of the storage space 13, the state shown in FIG. Specifically, the lower end surface of the trigger rod 87 is in contact with the main shaft portion 57 a of the power transmission shaft 57. The lower hold pin 83 is urged in the forward direction by the ring spring 84 and enters the holding hole 85 a of the snap rod 85. On the other hand, the upper hold pin 82 is prevented from moving in the forward direction by the outer peripheral surface of the snap rod 85. The trigger ball 86 is pushed by the lower hold pin 83 and enters and contacts the recess 87 a of the trigger rod 87. In this state, the snap rod 85 is held by the lower hold pin 83 to prevent vertical movement.

  Next, in the snap mechanism 80, when the float 51 rises as the drain flows in and the power transmission shaft 57 rises, the state shown in FIG. Specifically, the trigger rod 87 is pushed up by the main shaft portion 57a of the power transmission shaft 57 and rises. As the trigger rod 87 rises, the trigger ball 86 is pushed outward while in contact with the recess 87a. That is, the trigger ball 86 is pushed and moved to the lower hold pin 83 side by the inclined surface of the recess 87a. As a result, the lower hold pin 83 moves backward. When the trigger ball 86 comes into contact with a predetermined position of the recess 87a, the hold pin 83 comes out of the holding hole 85a of the snap rod 85. As a result, the holding of the snap rod 85 is released. On the other hand, the upper coil spring 88 is compressed as the trigger rod 87 rises, as in the first embodiment. Thereby, the lifting force (buoyancy) of the float 51 transmitted by the power transmission shaft 57 is stored in the upper coil spring 88 as an elastic force (elastic energy).

  When the holding of the snap rod 85 is released, as shown in FIG. 13, the snap rod 85 rapidly rises (snap operation) by the elastic force of the upper coil spring 88. When the snap rod 85 rises, the upper hold pin 82 moves forward by the urging force of the ring spring 84 and enters the holding hole 85 a of the snap rod 85. Thereby, the snap rod 85 is held again. The trigger ball 86 is pushed inward by the advance of the upper hold pin 82, and again enters the dent 87 a of the trigger rod 87 and comes into contact therewith. Also in this embodiment, due to the rapid rise of the snap rod 85, the valve operating shaft 95 also rises rapidly, and the air supply valve 30 is reliably opened and the exhaust valve 40 is closed. Thereby, the drain of the storage space 13 is discharged.

  When the float 51 is lowered as the drain is discharged, the power transmission shaft 57 is lowered and the end portion 57c of the power transmission shaft 57 is in contact with the upper end surface of the trigger rod 87 as shown in FIG. When the float 51 further descends and the power transmission shaft 57 descends, the trigger rod 87 is pushed down by the end portion 57c of the power transmission shaft 57 and descends as shown in FIG. As the trigger rod 87 is lowered, the trigger ball 86 is pushed outward while in contact with the recess 87a. As a result, the upper hold pin 82 moves backward. When the trigger ball 86 comes into contact with a predetermined position of the recess 87 a, the upper hold pin 82 comes out of the holding hole 85 a of the snap rod 85. As a result, the holding of the snap rod 85 is released. On the other hand, the lower coil spring 89 is compressed as the trigger rod 87 is lowered. Thereby, the downward force (self-weight) of the float 51 transmitted by the power transmission shaft 57 is stored in the lower coil spring 89 as an elastic force (elastic energy).

  When the holding of the snap rod 85 is released, as shown in FIG. 16, the snap rod 85 is rapidly lowered (snap operation) by the elastic force of the lower coil spring 89. When the snap rod 85 is lowered, the lower hold pin 83 is advanced by the biasing force of the ring spring 84 and enters the holding hole 85a of the snap rod 85. Thereby, the snap rod 85 is held again. Thus, in the snap mechanism 80 of the present embodiment, when the snap rod 85 is moved by the coil springs 88 and 89, the hold pin on the same side as the moving direction of the snap rod 85 is the holding hole 85a. And the snap rod 85 is held. The trigger ball 86 is pushed inward by the advancement of the lower hold pin 83 and enters the recess 87a of the trigger rod 87 again to come into contact therewith. Also in this embodiment, due to the rapid lowering of the snap rod 85, the valve operating shaft 95 is also rapidly lowered, and the air supply valve 30 is reliably closed and the exhaust valve 40 is opened.

  As described above, the snap mechanism 80 and the liquid pumping device 1 of the above embodiment also have the same operational effects as those of the first embodiment.

(Other embodiments)
In the snap mechanisms 60, 80 of the above embodiment, two coil springs 68, 69, 88, 89 are provided above and below the trigger rods 67, 87. However, one of them is provided on either one of them to compress and deform the coil spring. You may make it utilize both deformation | transformation. For example, the coil spring is provided only on the upper portion of the trigger rod so that when the trigger rod is raised, the coil spring is compressed, and when the trigger rod is lowered, the coil spring is pulled. By doing so, an elastic force due to compression deformation can be stored in the coil spring when the trigger rod is raised, and an elastic force due to tensile deformation can be stored in the coil spring when the trigger rod is lowered. Thereby, the snap rod can be snapped in both the upper and lower directions with one coil spring.

  In the snap mechanisms 60 and 80 of the above embodiment, the snap rods 64 and 85 are snapped in both the upper and lower directions, but may be snapped in only one of the directions.

  In the snap mechanisms 60 and 80 of the above embodiment, the coil springs 68, 69, 88, and 89 are used as the elastic members. However, an elastic body such as rubber, an oil damper, or the like may be used.

  Moreover, although the liquid pumping apparatus 1 of the said embodiment used the liquid to pump as drain, you may pump other liquids.

  Moreover, although the case where the snap mechanisms 60 and 80 of the said embodiment were provided in the liquid pumping apparatus 1 was demonstrated, you may make it provide in another mechanical apparatus.

  The technology disclosed in the present application is useful for a snap mechanism and a liquid pumping device including the snap mechanism.

DESCRIPTION OF SYMBOLS 1 Liquid pumping apparatus 10 Casing 13 Storage space 16 Steam inlet (inlet)
30 Supply valve 50 Float 57 Power transmission shaft 60, 80 Snap mechanism 62, 82, 83 Hold pin (holding member)
64,85 Snap rod (driven shaft member)
64c, 64d, 85a Holding hole 65, 66, 86 Trigger ball (release member)
67,87 Trigger rod (drive shaft member)
67b, 67c, 87a Recessed portion 68, 69, 88, 89 Coil spring (elastic member)
75,95 Valve operating shaft

Claims (5)

A drive shaft member having a recess on the side surface and moving in the axial direction by an external force;
A driven shaft member having a holding hole which is disposed on the side of the drive shaft member so as to extend in the axial direction of the drive shaft member and which opens toward the hollow portion;
A holding member that is provided so as to be able to advance and retract from the side of the driven shaft member toward the holding hole, and holds the driven shaft member by entering the holding hole;
A part of the holding hole is disposed inside the holding hole in a state where the holding member is positioned, and is pushed toward the holding member by the movement of the hollow portion accompanying the movement of the drive shaft member. A release member that pushes and releases the holding of the driven shaft member;
Provided between the drive shaft member and the driven shaft member, and elastically deforms as the drive shaft member moves, and when the driven shaft member is released, the driven shaft member is moved by the elastic force to A snap mechanism comprising: an elastic member that moves in an axial direction. The snap mechanism according to claim 1,
The drive shaft member has two recesses provided in order in the axial direction, and is configured to be movable in both directions in the axial direction by an external force.
The driven shaft member is provided in order in the axial direction, and has the two holding holes each opening toward the two depressions,
The release members are arranged one by one in the two holding holes,
One holding member is provided and urged in the forward direction, and when the driven shaft member is moved by the elastic member, the two holding holes are opposite to the moving direction of the driven shaft member. A snap mechanism that enters the holding hole and holds the driven shaft member. The snap mechanism according to claim 1,
The drive shaft member has one recess, and is configured to be movable in both directions in the axial direction by an external force.
The driven shaft member has one holding hole,
Two of the holding members are provided side by side in the axial direction of the driven shaft member. When each of the holding shaft members is urged in the forward direction and the driven shaft member is moved by the elastic member, of the two holding members, The snap mechanism, wherein the holding member on the same side as the moving direction of the driven shaft member enters the holding hole and holds the driven shaft member. The snap mechanism according to any one of claims 1 to 3,
A snap mechanism, wherein the elastic member is provided one at each axial end of the drive shaft member. A liquid storage space is formed inside, and a casing having the working gas inlet for introducing the working gas into the storage space and discharging the liquid in the storage space;
An air supply valve that opens and closes the inlet;
A liquid pumping device having a float disposed in the storage space, and a valve operating mechanism for opening and closing the air supply valve by raising and lowering the float;
The valve operating mechanism is
The snap mechanism according to any one of claims 1 to 4,
A power transmission shaft that is connected to the drive shaft member of the snap mechanism and moves the drive shaft member by the lifting and lowering force of the float;
A liquid pumping apparatus comprising: a valve operating shaft connected to the driven shaft member of the snap mechanism and configured to open and close the air supply valve by movement of the driven shaft member.

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