JP5416013B2 - Pressure control device - Google Patents

Description

  The present invention is provided with a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure, and a pressure setting unit that changes and sets the set pressure of the pressure control valve, and the pressure setting unit includes a spring A pressure setting spring capable of changing and setting the set pressure by adjusting a load, a driving unit for rotating and driving a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring, and controlling the operation of the driving unit to A transmission state in which a control unit for changing and setting a set pressure, a transmission gear on the pressure adjustment screw side, and a drive gear on the drive unit side mesh with each other to transmit the rotational driving force of the drive unit to the pressure adjustment screw and the transmission gear And a clutch mechanism that can be switched to a shut-off state in which the engagement of the drive unit with the drive gear is released and the transmission of the rotational driving force of the drive unit to the pressure adjusting screw is cut off.

The pressure control device as described above is provided in a fluid flow path such as a gas conduit for supplying city gas to each consumer, and adjusts the secondary side pressure to a desired set pressure. When city gas is supplied to each consumer through the gas conduit, the set pressure is set according to the load so that the pressure of the city gas supplied to each consumer is within a desired range even if the load fluctuates. It is required to change settings.
Therefore, the pressure setting unit of the pressure control device transmits the rotational driving force of the driving unit to the pressure adjusting screw, and the rotational driving force of the driving unit rotates the pressure adjusting screw to adjust the spring load applied to the pressure setting spring. Thus, the set pressure of the pressure control valve can be automatically changed and set. And the control part controls the action | operation of a drive part, The setting pressure of a pressure control valve is changed and set to the target setting pressure according to load etc.

Also, since it is necessary to change and set the set pressure of the pressure control valve by manual operation during construction and maintenance, etc., as described above, the rotational drive force of the drive unit is transmitted to the pressure adjustment screw to set the pressure control valve. In addition to automatically changing and setting the pressure, it is required that the set pressure of the pressure control valve can be changed and set manually by an operator.
Therefore, the pressure setting unit engages the transmission gear on the pressure adjustment screw side and the drive gear on the drive unit side, and releases the meshing state between the transmission state and the transmission gear and the drive gear in which the rotational driving force of the drive unit is transmitted to the pressure adjustment screw. Thus, a clutch mechanism is provided that can be switched to a cut-off state in which transmission of the rotational driving force of the drive unit to the pressure adjusting screw is cut off. As a result, when the set pressure of the pressure control valve is changed and set manually, the clutch mechanism is switched to the disengaged state, and the pressure adjustment screw is rotated by manual operation by an operator or the like, thereby applying the spring load applied to the pressure setting spring. To adjust the setting pressure of the pressure control valve freely. As described above, when the set pressure of the pressure control valve is automatically changed and set, the clutch mechanism is switched to the transmission state.

  In such a pressure control device, conventionally, the clutch mechanism moves the transmission gear in the axial direction between the meshing position where the transmission gear and the driving gear mesh with each other and the meshing release position where the meshing between the transmission gear and the driving gear is released. It is comprised freely (for example, refer patent document 1).

Japanese Patent No. 4218850

  In the device described in Patent Document 1, the clutch mechanism moves the transmission gear in the axial direction between the meshing position and the meshing release position to switch between the transmission state and the shut-off state. When the transmission gear is moved to the position, the transmission gear must be moved while sliding in the axial direction with the drive gear, and the sliding resistance at that time increases. Therefore, the operating force required to move the transmission gear from the meshing position to the mesh release position increases, and the operability deteriorates. Further, when the transmission gear is moved from the mesh release position to the mesh position, it is required to improve the engagement of the transmission gear with respect to the drive gear in order to move the transmission gear in the axial direction and mesh with the drive gear. Therefore, it is necessary to newly provide a guide means for guiding the transmission gear to an appropriate position that meshes with the drive gear, resulting in a complicated configuration.

  The present invention has been made paying attention to such a point, and its purpose is to switch between the transmission state and the cutoff state without incurring a complicated configuration for switching the clutch mechanism between the transmission state and the cutoff state. It is in the point which provides the pressure control apparatus which can aim at the improvement of operativity when performing.

In order to achieve this object, the characteristic configuration of the pressure control device according to the present invention includes a pressure control valve that adjusts the secondary side pressure of the fluid flow path to a set pressure, and changes and sets the set pressure of the pressure control valve. The pressure setting unit rotates a pressure setting spring capable of changing and setting the set pressure by adjusting a spring load and a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring. A drive unit for driving, a control unit for controlling the operation of the drive unit to change and set the set pressure, a transmission gear on the pressure adjusting screw side, and a drive gear on the drive unit side mesh with each other, A transmission state in which the rotational driving force is transmitted to the pressure adjusting screw, and a blocking state in which the engagement between the transmission gear and the driving gear is released to interrupt the transmission of the rotational driving force of the driving unit to the pressure adjusting screw. Switchable switch In the pressure control device and a pitch mechanism,
The clutch mechanism includes a meshing position where the transmission gear and the driving gear mesh with each other, with either the driving gear or the transmission gear as a fixed gear and the other as a moving gear, the transmission gear, and the driving gear. The movable gear is configured to be movable in the radial direction at a mesh release position for releasing the mesh.

According to this characteristic configuration, the clutch mechanism that can be switched between the transmission state and the cutoff state is provided, and this clutch mechanism moves between the meshing position and the mesh release position by moving the moving gear in the radial direction. Move to switch between transmission and blocking.
When moving the moving gear from the meshing position to the meshing release position, the moving gear is moved to the side away from the fixed gear in the radial direction. Thereby, the movement side gear can be moved from the engagement position to the engagement release position while preventing the fixed side gear and the movement side gear from sliding. Further, when the moving gear is moved from the meshing release position to the meshing position, the moving gear is moved closer to the stationary gear in the radial direction. Thereby, even without providing a guide means or the like for guiding the moving gear to an appropriate position meshing with the fixed gear, using the chevron tooth shape of both the moving gear and the fixed gear, The moving gear can be meshed with the fixed gear to the meshing position.

  From the above, as a configuration for switching the clutch mechanism between the transmission state and the disengagement state, it is not necessary to provide a guide means or the like, and the configuration for switching the clutch mechanism between the transmission state and the disengagement state is complicated. Pressure control that can improve the operability for switching between the transmission state and the cutoff state while being able to prevent switching, and to perform switching operation while reducing the sliding resistance between the drive gear and transmission gear The device has been realized.

  A further characteristic configuration of the pressure control device according to the present invention is a rotation operation unit that is swingable between a first position and a second position around an axis along the axial direction of the drive gear and the transmission gear; As the rotation operation unit is operated to the first position, the movement side gear is moved to the meshing position, and as the rotation operation unit is operated to the second position, the movement side gear is moved to the meshing position. There is a linkage mechanism that links the operation of the rotation operation unit and the operation of the moving gear so as to move to the mesh release position.

According to this characteristic configuration, when the rotation operation unit is operated to the first position, the linkage mechanism can move the moving gear to the meshing position, and the clutch mechanism can be switched to the transmission state. Further, when the rotation operation unit is operated to the second position, the linkage mechanism can move the moving gear to the mesh release position, and the clutch mechanism can be switched to the disconnected state. Thereby, the operator can switch the clutch mechanism between the transmission state and the cutoff state only by operating the rotation operation unit between the first position and the second position, and the operability can be improved.
And since the rotation operation part is rock | fluctuated to the 1st position and the 2nd position around the axial center along the axial center direction of a drive gear and a transmission gear, a rotation operation part is radial direction of a drive gear and a transmission gear. To move to the first position and the second position. As a result, the moving direction of the rotation operation unit and the moving direction of the moving side gear are the same direction, so that a simple structure can be achieved as the linkage mechanism, and the structure can be simplified.

  A further characteristic configuration of the pressure control device according to the present invention is that it includes return urging means for urging the moving side gear toward the meshing position side or the opposite side.

  According to this characteristic configuration, when the moving gear is moved from the mesh release position to the mesh position or from the mesh position to the mesh release position, the return biasing force is received by the return biasing means, and the mesh position or the mesh position from the mesh release position is received. The moving gear can be moved from the position to the mesh release position. Therefore, by receiving the return urging force by the return urging means, it is possible to reduce the operation force required to move the moving gear, and operability when switching between the transmission state and the cutoff state is achieved. Can be improved. In addition, when the return gear is biased toward the meshing position, the clutch mechanism can be appropriately switched to the transmission state by biasing the shift gear toward the meshing position. Therefore, the rotational driving force of the drive unit can be appropriately transmitted to the pressure adjusting screw, and the set pressure of the pressure control valve can be automatically changed and set accurately.

  A further characteristic configuration of the pressure control device according to the present invention is that it includes a lock mechanism that holds the moving side gear in at least one of the meshing position and the meshing release position.

  According to this characteristic configuration, the movement-side gear can be held at the meshing position or the meshing release position by the lock mechanism, so that the state where the movement-side gear is located at the meshing position or the meshing release position can be maintained. Therefore, the state switched to the transmission state or the cutoff state can be appropriately maintained. Switching between the transmission state and the cutoff state can be performed appropriately.

Overall schematic diagram of pressure control device Schematic perspective view of pilot valve and pressure setting unit Schematic sectional view of pilot valve and pressure setting part Perspective view showing a part of the pressure setting section Perspective view showing a part of the pressure setting section Perspective view showing a part of the pressure setting section Sectional view showing part of the pressure setting section The figure which shows a state when switching a clutch mechanism to a transmission state The figure which shows the state in the middle of switching a clutch mechanism from the transmission state to the interruption | blocking state The figure which shows the state when the clutch mechanism is switched to the disengaged state

An embodiment of a pressure control device according to the present invention will be described with reference to the drawings.
As shown in FIG. 1, the pressure control device includes a pressure control valve 2 that adjusts the secondary pressure of the fluid flow path 1 to a set pressure, and a pressure setting unit 3 that changes and sets the set pressure of the pressure control valve 2. And is configured. The pressure control device is provided with a pilot valve 4 that supplies a drive pressure to the pressure control valve 2 so that the secondary pressure of the fluid flow path 1 becomes a set pressure. By adjusting 4, the set pressure of the pressure control valve 2 is changed and set.

  Here, although illustration is omitted, for example, by branching the downstream side of the pressure control valve 2 of the fluid flow path 1 into a plurality of branch paths and connecting each of the plurality of branch paths to each consumer, It is configured to supply a fluid such as natural gas to a plurality of consumers. The secondary pressure on the downstream side of the pressure control valve 2 is adjusted to a set pressure lower than the primary pressure on the upstream side.

  The pressure control valve 2 includes a first diaphragm D1, and the internal space is partitioned into a first chamber H1 and a second chamber H2 by the first diaphragm D1. The pressure control valve 2 includes a first valve body B1 that opens and closes the fluid flow path 1, and the first valve body B1 is configured to be opened and closed by a first diaphragm D1. The first chamber H1 is provided with a first biasing spring G1 that biases the first diaphragm D1 toward the valve closing direction of the first valve body B1.

  The pilot valve 4 includes a second diaphragm D2 and a third diaphragm D3, and the internal spaces of the second diaphragm D2 and the third diaphragm D3 are the third chamber H3, the fourth chamber H4, and the fifth chamber H5. It is divided into. The third chamber H3 is communicatively connected to the secondary side of the fluid flow path 1 (downstream side from the pressure control valve 2) by the first secondary pressure introduction path 5, and the second secondary pressure The introduction path 6 is connected to the first chamber H1 of the pressure control valve 2 in communication. The fourth chamber H4 is connected to the primary side (upstream side of the pressure control valve 2) of the fluid flow path 1 by the primary pressure introduction path 7 and is connected to the pressure control valve 2 by the driving pressure introduction path 8. The two rooms H2 are connected in communication. Although not shown, the second diaphragm D2 and the third diaphragm D3 are connected by a connecting portion or the like, and are configured to be integrally displaceable up and down. A second urging spring G2 is disposed in the fifth chamber H5. The second urging spring G2 urges the third diaphragm D3 toward the fourth chamber H4, whereby the second diaphragm D2 is urged toward the third chamber H3 side.

  A second valve body B2 is provided at the distal end of the primary pressure introduction path 7, and the second valve body B2 is configured to be opened and closed by a second diaphragm D2. That is, when the second diaphragm D2 is displaced toward the third chamber H3, the second valve body B2 is opened, and the fluid on the primary side of the fluid flow path 1 passes through the primary pressure introduction path 7 to the fourth chamber H4. be introduced. On the other hand, the displacement of the second diaphragm D2 toward the fourth chamber H4 moves the second valve body B2 toward the valve closing side, thereby reducing the amount of primary fluid introduced into the fourth chamber H4.

The operation when the secondary pressure is adjusted to the set pressure will be described.
When the secondary pressure of the fluid flow path 1 falls below the set pressure, the third chamber H3 of the pilot valve 4 that is connected to the secondary side of the fluid flow path 1 through the first secondary pressure introduction path 5 And the second diaphragm D2 is displaced toward the third chamber H3 by the biasing force of the second biasing spring G2. As a result, the second valve body B2 of the pilot valve 4 is operated to the open side, and the primary side pressure of the fluid flow path 1 is introduced into the fourth chamber H4 through the primary side pressure introduction path 7, and the pressure in the fourth chamber H4 Rises. Then, the increased pressure in the fourth chamber H4 is supplied as the driving pressure to the second chamber H2 of the pressure control valve 2 through the driving pressure introduction path 8, and the pressure in the second chamber H2 also increases, and the first chamber H1. The first diaphragm D1 is displaced toward the first chamber H1 due to the pressure difference between the first chamber H2 and the second chamber H2. Therefore, the first valve body B1 of the pressure control valve 2 is operated to the open side, and the secondary side pressure of the fluid flow path 1 is increased to adjust the secondary side pressure to the set pressure.

  On the other hand, when the secondary side pressure rises higher than the set pressure, the pressure in the third chamber H3 of the pilot valve 4 rises, and the second diaphragm D2 resists the biasing force of the second biasing spring G2, and the second diaphragm D2 moves into the fourth chamber H4. Displace to the side. As a result, the second valve body B2 of the pilot valve 4 is operated to the closed side, and there is no fluid supply source to the fourth chamber H4. Then, the fluid in the second chamber H2 is discharged to the secondary side via the orifice U, the second secondary pressure introduction path 6, the third chamber H3, and the first secondary pressure introduction path 5, and the second chamber H2 is discharged to the secondary side. The pressure in the two chambers H2 decreases, and the first diaphragm D1 is displaced toward the second chamber H2 due to the pressure difference between the first chamber H1 and the second chamber H2. Accordingly, the first valve body B1 of the pressure control valve 2 is operated to the closed side, and the secondary side pressure of the fluid flow path 1 is reduced to adjust the secondary side pressure to the set pressure.

  The set pressure of the pressure control valve 2 is not always a constant pressure, but the set pressure is adjusted to the target set pressure that is changed according to the load or the like by providing the pressure setting unit 3. For example, in the fluid flow path 1, the load becomes large during a time period in which much demand is expected, so the pressure setting unit 3 adjusts the set pressure to a high target set pressure, and the load is set in other time periods. Therefore, the set pressure is adjusted to the low target set pressure.

  As described above, in the pilot valve 4, the driving pressure corresponding to the magnitude relationship between the urging force of the second urging spring G <b> 2 and the secondary side pressure supplied through the first secondary side pressure introduction path 5 is the pilot valve 4. To the pressure control valve 2, and the secondary pressure is adjusted to the set pressure by the pressure control valve 2. Therefore, the pressure setting unit 3 changes and sets the set pressure of the pressure control valve 2, but the second biasing spring G2 is configured as a pressure setting spring 9 that sets the set pressure of the pressure control valve 2. By adjusting the spring load of the pressure setting spring 9 (second biasing spring G2), the set pressure of the pressure control valve 2 can be changed and set.

  As shown in FIGS. 2 and 3, the pressure setting unit 3 rotates the pressure adjusting screw 10 that can adjust the spring load applied to the pressure setting spring 9 in addition to the pressure setting spring 9 described above. And a control unit (not shown) for changing and setting the set pressure by controlling the operation of the drive unit 11. The pressure setting unit 3 is provided with a pressure setting spring 9 and a pressure adjusting screw 10 inside a pilot valve forming unit 14 that forms the pilot valve 4, and a drive unit 11 and a control unit ( The pilot valve forming portion 14 and the storage case 15 are connected to each other so that the spring load of the pressure setting spring 9 can be adjusted.

  As shown in FIG. 3, the pressure setting spring 9 of the pressure setting unit 3 is disposed in the fifth chamber H5 of the pilot valve 4, its upper end is in contact with the third diaphragm D3, and its lower end is It is in contact with the spring receiver 13. And in the lower part which forms the 5th chamber H5 among pilot valve formation parts 14, the 1st screw part N1 is formed in the inner wall part, and spring receiving part 13 was formed in the outer peripheral part. The second screw portion N2 and the first screw portion N1 formed on the pilot valve forming portion 14 are provided in a screwed state. In the fifth chamber H5 of the pilot valve 4, a first rotating shaft J1 is disposed in a state of penetrating the spring receiving portion 13 in the vertical direction. 1 rotation axis J1 and the spring receiving part 13 rotate integrally, and the spring receiving part 13 is comprised so that it may move up and down. The spring receiving portion 13 is moved up and down by integral rotation of the first rotating shaft J1 and the spring receiving portion 13, and the spring load applied to the pressure setting spring 9 is adjustable. Thereby, the first rotating shaft J1 and the spring receiving portion 13 are configured as the pressure adjusting screw 10. Further, the first rotating shaft J1 is disposed in a state where the lower end portion having a small diameter penetrates the pilot valve forming portion 14 and protrudes downward.

  On the other hand, as shown in FIG. 3, the drive unit 11 and the control unit of the pressure setting unit 3 are disposed inside the storage case 15 together with the second rotation shaft J <b> 2 that is rotationally driven by the drive unit 11. The second rotating shaft J2 is disposed in a state where the upper end side portion protrudes upward from the storage case 15. And the lower end side part of the 1st rotating shaft J1 and the upper end side part of the 2nd rotating shaft J2 are connected by the rotating shaft connection part 16, and the 1st rotating shaft J1 and the 2nd rotating shaft J2 are integrated. It is configured to be freely rotatable. As a result, the second rotating shaft J2 is rotationally driven by the drive unit 11, whereby the second rotating shaft J2 and the first rotating shaft J1 are integrally rotated to move the spring receiving portion 13 up and down, and the pressure setting spring. Adjust the spring load applied to 9.

  As for the connection between the pilot valve forming portion 14 and the storage case 15, as shown in FIGS. 2 and 3, in addition to the rotating shaft connecting portion 16 that connects the first rotating shaft J1 and the second rotating shaft J2, the pilot valve forming portion 14 and the storage case 15 are connected. A connecting member 22 that connects the plate-like first connecting portion K1 fixed to the valve forming portion 14 and the plate-like second connecting portion K2 fixed to the upper end side portion of the storage case 15 is provided. The connecting member 22 is formed in a columnar shape, and a plurality (four in this embodiment) are provided, and the first connecting portion K1 and the second connecting portion K2 are connected at a plurality of locations. In order to electrically insulate the pilot valve 4 and the storage case 15, for example, an insulating member is interposed between the second connecting portion K2 and the connecting member 22 is connected to the second connecting portion K2. The connecting member 22 itself is made of an insulating material.

As shown in FIG. 4, the drive unit 11 includes an electric drive motor 23 and a first reduction mechanism S <b> 1 that rotates the second rotation shaft J <b> 2 by the rotational driving force of the drive motor 23. The first reduction mechanism S1 includes a drive gear 24 fixed to the output shaft of the drive motor 23, and a first gear F1 externally fixed to the second rotating shaft J2. The first gear F1 is a drive gear. The drive gear 24 and the first gear F1 are engaged with each other. Thus, the rotation of the drive motor 23 is decelerated by the first reduction mechanism S1 and then transmitted to the second rotation axis J2. The drive motor 23 rotates the second rotation axis J2.
As described above, when the second rotating shaft J2 is rotationally driven by the drive motor 23, the second rotating shaft J2 and the first rotating shaft J1 are integrally rotated to move the spring receiving portion 13 up and down as described above. The set pressure of the pressure control valve 2 can be changed and set by adjusting the spring load applied to the pressure setting spring 9 (see FIG. 3).

  Then, the control unit of the pressure setting unit 3 monitors the rotation amount of the second rotation shaft J2, and is driven so that the rotation amount of the second rotation shaft J2 becomes the target rotation amount corresponding to the target set pressure. By controlling the operation of the motor 23, the set pressure of the pressure control valve 2 is changed and set to the target set pressure. Therefore, as shown in FIGS. 4 and 5, the pressure setting unit 3 is provided with a rotation amount detection sensor 25 that detects the rotation amount of the second rotation shaft J <b> 2, and the control unit detects the rotation amount detection sensor 25. Based on the 25 detection information, the rotation amount of the second rotation axis J2 is monitored.

  As shown in FIG. 5, as the rotation amount detection sensor 25, there are a rotation angle detection sensor 26 that detects the rotation angle of the second rotation axis J2, and a rotation speed detection sensor 27 that detects the rotation speed of the second rotation axis J2. Is provided. The rotation angle detection sensor 26 is disposed at a lower end side portion of the second rotation axis J2. The rotation speed detection sensor 27 detects the rotation amount of the third rotation axis J3 transmitted by the rotation of the second rotation axis J2 being decelerated by the second speed reduction mechanism S2, thereby determining the rotation speed of the second rotation axis J2. It is configured to detect. The third rotation axis J3 is arranged in a state extending in a direction orthogonal to the second rotation axis J2. The second reduction mechanism S2 is in a state in which the second gear F2 formed on the outer peripheral portion of the second rotating shaft J2 and the third gear F3 fixed to the third rotating shaft J3 mesh with each other below the first gear F1. It is comprised with the worm reduction mechanism provided in.

  The control unit of the pressure setting unit 3 uses the rotation angle P1 of the second rotation axis J2 detected by the rotation angle detection sensor 26 and the rotation speed P2 of the second rotation axis J2 detected by the rotation speed detection sensor 27 as follows. [Equation 1] is used to obtain the rotation amount P3 of the second rotation axis J2.

[Equation 1]
P3 = P1 + 360 × P2
Here, P1 is the rotation angle of the second rotation axis J2 detected by the rotation angle detection sensor 26, P2 is the rotation speed of the second rotation axis J2 detected by the rotation speed detection sensor 27, and P3 is the first rotation speed. This is the amount of rotation of the two rotation axis J2.

  The control unit of the pressure setting unit 3 determines the magnitude relationship between the rotation amount of the second rotation shaft J2 and the set pressure of the pressure control valve 2 (for example, the setting of the pressure control valve 2 increases as the rotation amount of the second rotation shaft J2 increases). (A relationship such as an increase in pressure) is stored in advance, and the amount of rotation of the second rotary shaft J2 is set so that the set pressure of the pressure control valve 2 becomes the target set pressure using the stored magnitude relationship. The operation of the drive motor 23 is controlled in order to adjust this. That is, the control unit 12 obtains the target rotation amount of the second rotation axis J2 corresponding to the target set pressure from the stored magnitude relationship, and the rotation amount of the second rotation axis J2 obtained by the above [Equation 1] is obtained. The operation of the drive motor 23 is controlled so as to achieve the target rotation amount.

(Clutch mechanism)
In the pressure control device according to the present invention, as described above, the control unit can automatically change and set the set pressure of the pressure control valve 2 to the target set pressure by controlling the operation of the drive motor 23. The set pressure of the pressure control valve 2 can be changed and set by the manual operation of the operator.
That is, in the pressure control device according to the present invention, as shown in FIGS. 6 to 10, the pressure setting unit 3 includes the first gear F <b> 1 (corresponding to the transmission gear) on the pressure adjusting screw 10 side and the drive unit 11 side. The transmission state where the drive gear 24 is engaged and the rotational drive force of the drive unit 11 is transmitted to the pressure adjustment screw 10 and the engagement between the first gear F1 and the drive gear 24 are released, and the pressure adjustment screw for the rotational drive force of the drive unit 11 is released. 10 is provided with a clutch mechanism 30 that can be switched to a cut-off state that cuts off transmission to. Here, FIG. 6 shows an exploded perspective view when each member of the clutch mechanism 30 is disassembled, and FIG. 7 shows a cross-sectional view of the clutch mechanism 30. 8 shows a state in which the clutch mechanism 30 is switched to the transmission state, FIG. 9 shows a state in the middle of switching the clutch mechanism 30 from the transmission state to the cutoff state, and FIG. The state which has switched the mechanism 30 to the interruption | blocking state is shown.

  As described above, by providing the clutch mechanism 30, when the set pressure of the pressure control valve 2 is changed to the target set pressure, the operation of the drive motor 23 is controlled by the control unit, and the first rotation shaft J1 and the second rotation are controlled. In the case of automatically rotating the shaft J2, the clutch mechanism 30 is switched to the transmission state, and the first rotating shaft J1 and the first rotating shaft J1 and the second rotating shaft 16 are manually operated by the manual operation member 20 (see FIG. 3) provided in the rotating shaft connecting portion 16. When the two-rotation shaft J2 is rotated, the clutch mechanism 30 is switched to the disconnected state.

  The clutch mechanism 30 is manually operated so as to be swingable between a first position (see FIG. 8) and a second position (see FIG. 10) around the vertical axis along the axial direction of the first gear F1 and the drive gear 24. The drive gear 24 is moved to the operation-type rotation operation unit 31, the mesh position where the first gear F 1 and the drive gear 24 mesh (see FIG. 8), and the mesh release position where the mesh of the first gear F 1 and the drive gear 24 is released. The drive gear 24 is moved to the meshing position and the meshing release position by the swinging operation of the first plate-like body Q1 that is movable in the radial direction and the rotation operation unit 31 between the first position and the second position. A linkage mechanism 32 that links the operation of the rotation operation unit 31 and the operation of the drive gear 24 is provided. In this way, the clutch mechanism 30 meshes with the meshing position by moving the first gear F1 as a stationary gear and the driving gear 24 as a moving gear and moving the driving gear 24 as a moving gear in the radial direction thereof. The drive gear 24 is moved to the release position so that it can be switched between a transmission state and a cutoff state.

  One end portion of the rotation operation portion 31 is fitted into a rotating body 46 protruding upward from the upper surface portion of the cylindrical support portion 34, and a first position around the vertical axis with the one end portion as a fulcrum (see FIG. 8) and a second position (see FIG. 10). As shown in FIGS. 6 and 7, a disc-shaped second plate-like body Q2 is fitted on the outer periphery of the support portion 34, and the upper surface of the second plate-like body Q2 is on the upper side. An extending standing wall portion 35 is provided. And this standing wall part 35 is formed in circular arc shape by planar view so that it may extend along the external shape of the 2nd plate-shaped body Q2, and is the 1st recessed part formed in the lower surface part of the rotation operation part 31. The standing wall portion 35 is fitted to R1. Accordingly, the rotation operation unit 31 is configured to be swingable between the first position and the second position while being guided by the standing wall 35 by fitting the first recess R1 and the standing wall 35. ing.

  The first plate-like body Q1 is composed of a convex plate-like body whose central portion protrudes from both end portions in plan view, and is provided so as to be swingable around the vertical axis with its one end portion as a fulcrum. It has been. A drive motor 23 is attached to the lower side of the central portion of the first plate-like body Q1. The output shaft extending upward from the drive motor 23 penetrates the first plate Q1 in the vertical direction, and the drive gear 24 provided on the output shaft is more than the first plate Q1. It is arranged on the upper side. As a result, the first plate-like body Q1, the drive motor 23, and the drive gear 24 can move integrally as a result of the first plate-like body Q1 swinging around the vertical axis with one end portion as a fulcrum. It is configured.

  The linkage mechanism 32 includes an engagement pin 41 that is movable integrally with the rotation operation unit 31, and an elongated engagement groove 42 formed at the other end portion of the first plate-like body Q1. By engaging the engagement pin 41 with the engagement groove 42, the operation of the rotation operation unit 31 and the operation of the drive gear 24 are linked. A rotating body 46 that is supported so as to be rotatable around the vertical axis is disposed inside the support section 34 that supports the rotation operation section 31. The rotating body 46 is rotated by a fastener T such as a bolt. Fastened to the operation unit 31. Therefore, when the rotation operation unit 31 is operated to swing, the rotating body 46 is configured to rotate in accordance with the swing operation. An engaging pin 41 is provided at the lower end of the rotating body 46 so as to extend downward, and the engaging pin 41 is disposed at a position eccentric from the rotational axis of the rotating body 46. Thus, when the rotation operation unit 31 is swung around the vertical axis, the rotating body 46 rotates along with the swinging operation, and the engagement pin 41 rotates around the rotation axis of the rotating body 46. . Since the engaging pin 41 rotates while being engaged with the engaging groove 42, the engaging pin 41 moves while pressing the side wall portion of the engaging groove 42. The body Q1 is swung around the vertical axis. In this way, the linkage mechanism 32 links the operation of the rotation operation unit 31 with the operation of the first plate-like body Q1, and the rotation operation unit 31 swings to the first position as shown in FIG. When operated, the first plate-like body Q1 is swung so that the drive gear 24 moves to the meshing position. As shown in FIG. 10, when the rotation operation unit 31 is swung to the second position, the drive gear is driven. The first plate member Q1 is swung so that 24 moves to the mesh release position.

  The meshing position (see FIG. 8) and the meshing release position (see FIG. 10) are set as positions that are spaced apart in the radial direction of the first gear F1. Then, the drive gear 24 is moved to the mesh release position by swinging the first plate-like body Q1 having the drive gear 24 in the meshing position in the radial direction away from the first gear F1. Thereby, the drive gear 24 can be moved to the meshing release position while preventing the sliding between the drive gear 24 and the first gear F1 and reducing the sliding resistance. As a result, it is possible to reduce the operating force required when swinging the rotary operation unit 31 from the first position to the second position, and to improve the operability. Further, the drive gear 24 is moved to the meshing position by swinging the first plate-like body Q1 having the drive gear 24 in the meshing release position so as to approach the first gear F1 in the radial direction. Thereby, even if it does not have a guide means etc., the drive gear 24 is appropriately bitten with respect to the first gear F1 by utilizing the mountain-shaped tooth shape of both the drive gear 24 and the first gear F1. Therefore, the configuration can be simplified.

(Return bias means)
In the pressure control device according to the present invention, the first elastic body C1 such as a compression spring that returns and urges the drive gear 24 to the engagement position side of the engagement position and the engagement release position (corresponding to the return urging means). Is provided. The first elastic body C1 has one end connected to the other end of the first plate Q1 opposite to the one end serving as the swing fulcrum of the first plate Q1, and the other end of the first plate Q1. The drive gear 24 is urged to return to the meshing position side by urging the portion toward the first gear F1 in the radial direction.

(Lock mechanism)
Further, the pressure control device according to the present invention is provided with a lock mechanism 33 that holds the drive gear 24 at each of the meshing position and the meshing release position. The lock mechanism 33 is configured to hold the drive gear 24 in the meshing position and the meshing release position by holding the rotation operation unit 31 in the first position and the second position, respectively.

  Hereinafter, the configuration of the lock mechanism 33 will be described with reference to FIGS. Here, FIG. 7A shows a state where the lock mechanism 33 holds the position of the rotation operation unit 31, and FIG. 7B shows a position where the lock mechanism 33 holds the position of the rotation operation unit 31. Indicates the state in which is released. FIG. 8 shows a state where the lock mechanism 33 holds the position of the rotation operation unit 31 at the first position (that is, a state where the drive gear 24 is held at the meshing position). 9 shows a state in which the lock mechanism 33 releases the position holding of the rotation operation unit 31 in the first position (that is, a state in which the position holding of the drive gear 24 to the meshing position is released). FIG. The state where the mechanism 33 holds the position of the rotation operation unit 31 at the second position (that is, the state where the drive gear 24 is held at the mesh release position) is shown.

  As shown in FIG. 7, the rotation operation unit 31 has a columnar exit / retreat button 36 that can be moved in and out along the horizontal direction on the side protruding to the outside of the rotation operation unit 31 and the side retreating to the inside. Is provided. A second elastic body C <b> 2 such as a compression spring that presses and urges the exit / retreat button 36 outward from the rotation operation unit 31 is provided inside the rotation operation unit 31. The exit / retreat button 36 is provided with a second recess R2 in the same manner as the first recess R1 provided in the rotation operation portion 31, and the upright wall portion 35 is also fitted into the second recess R2. Further, as shown in FIGS. 8 to 10, an arc-shaped protrusion 37 protruding in the horizontal direction is formed on the side wall portion of the second recess R <b> 2 of the exit / exit button 36. An arc-shaped recessed groove 38 that is recessed in the horizontal direction is formed. As shown in FIGS. 8 and 10, a protrusion 37 is configured to be freely fitted into the recessed groove 38. The recessed groove 38 is formed at a position corresponding to the first position of the rotation operation unit 31 and a position corresponding to the second position of the rotation operation unit 31. As a result, the lock mechanism 33 includes the protrusion 37 and the recessed groove 38, and the protrusion 37 is fitted into the recessed groove 38, so that the rotation operation portion 31 is in each of the first position and the second position. Hold position.

  Accordingly, when the rotation operation unit 31 is positioned at the first position, the projection 37 is fitted into the recessed groove portion 38, the rotation operation unit 31 is held at the first position, and the rotation operation unit 31 is moved to the second position. Also when positioned, the protrusion 37 fits into the recessed groove 38 and the rotation operation unit 31 is held at the second position. Therefore, when swinging the rotation operation unit 31 located at the first position or the second position, first, the operator pushes the withdrawal button 36 to the side of retraction inside the rotation operation unit 31, After the fitting of the protrusion 37 and the recessed groove 38 is released to release the position holding of the rotation operation unit 31, the rotation operation unit 31 is swung.

  As described above, the clutch mechanism 30 swings the rotation operation unit 31 between the first position and the second position to move the drive gear 24 to the meshing position and the meshing release position, so that the transmission state and the cutoff state are achieved. It is configured to be switchable. Here, the change setting of the set pressure of the pressure control valve 2 is normally performed automatically by the control unit controlling the operation of the drive motor 23, so that the clutch mechanism 30 is in the transmission state as shown in FIG. It has been switched to. Then, when the set pressure of the pressure control valve 2 is changed and set by manual operation by the operator, the operator pushes the exit / retreat button 36 to the side of retraction inside the rotation operation unit 31 as shown in FIG. In this way, after the position holding of the rotation operation unit 31 is released, the rotation operation unit 31 is swung to switch the clutch mechanism 30 to the disengaged state as shown in FIG.

  Then, in order to change and set the set pressure of the pressure control valve 2 by manual operation by the operator, as shown in FIG. 3, the rotary shaft connecting portion 16 is provided with a manual operation member 20. When the manual operation member 20 is rotated by manual operation, the first rotation axis J1 and the second rotation axis J2 are rotated in accordance with the rotation operation. Thus, after the clutch mechanism 30 is switched to the disconnected state, the operator rotates the manual operation member 20 to rotate the first rotating shaft J1 and the second rotating shaft J2 to move the spring receiving portion 13 up and down. The set pressure of the pressure control valve 2 is changed and set by adjusting the spring load applied to the pressure setting spring 9. In this way, the pressure setting unit 3 is configured to be able to change and set the set pressure of the pressure control valve 2 by an operator's manual operation.

[Another embodiment]
(1) In the above embodiment, the clutch mechanism uses the first gear F1 as the fixed gear and the drive gear 24 as the moving gear, but conversely, the first gear F1 as the moving gear and the drive gear 24 as the driving gear 24. As the fixed side gear, the first gear F1 is moved in the radial direction thereof, so that it can be moved between the meshing position and the meshing release position so as to be switchable between the transmission state and the cutoff state.

(2) In the above embodiment, the lock mechanism 33 holds the drive gear 24 at each of the meshing position and the meshing release position. For example, the lock mechanism 33 holds the drive gear 24 only at the meshing position, or conversely It is also possible to hold the drive gear 24 only at the mesh release position.

(3) In the above embodiment, the return urging means (first elastic body C1) is configured to return and urge the movement side gear (drive gear 24 to the meshing position side), but the movement side gear (drive) The return urging means may be configured to urge the gear 23) toward the engagement release position side opposite to the engagement position.

  The present invention is provided with a pressure control valve that adjusts the secondary pressure of the fluid flow path to a set pressure, and a pressure setting unit that changes and sets the set pressure of the pressure control valve, and the pressure setting unit includes a spring A pressure setting spring capable of changing and setting the set pressure by adjusting a load, a driving unit for rotating and driving a pressure adjusting screw capable of adjusting a spring load applied to the pressure setting spring, and controlling the operation of the driving unit to A transmission state in which a control unit for changing and setting a set pressure, a transmission gear on the pressure adjustment screw side, and a drive gear on the drive unit side mesh with each other to transmit the rotational driving force of the drive unit to the pressure adjustment screw and the transmission gear And a clutch mechanism that can be switched to a cut-off state that releases transmission of the rotational driving force of the drive unit to the pressure adjusting screw by releasing the meshing between the drive gear and the drive gear. And Ri changing without complicating the configuration for, it is adaptable to various pressure control apparatus which can improve the operability when performing switching between a cutoff state and the transmission state.

DESCRIPTION OF SYMBOLS 1 Fluid flow path 2 Pressure control valve 3 Pressure setting part 9 Pressure setting spring 10 Pressure adjusting screw 11 Drive part 12 Control part 24 Drive gear 30 Clutch mechanism 31 Rotation operation part 32 Linking mechanism 33 Lock mechanism C1 Return urging means (first Elastic body)
F1 transmission gear (first gear)

Claims (4)

A pressure control valve for adjusting the secondary pressure of the fluid flow path to a set pressure and a pressure setting unit for changing and setting the set pressure of the pressure control valve are provided, and the pressure setting unit is configured by adjusting a spring load. A pressure setting spring capable of changing and setting the set pressure, a drive unit for rotationally driving a pressure adjustment screw capable of adjusting a spring load applied to the pressure setting spring, and controlling the operation of the drive unit to change the set pressure A transmission state in which the control unit to be set, the transmission gear on the pressure adjustment screw side and the drive gear on the drive unit side mesh with each other to transmit the rotational driving force of the drive unit to the pressure adjustment screw, the transmission gear, and the drive A pressure control device comprising a clutch mechanism that can be switched to a cut-off state that releases the meshing with the gear and cuts off the transmission of the rotational driving force of the drive unit to the pressure adjusting screw;
The clutch mechanism includes a meshing position where the transmission gear and the driving gear mesh with each other, with either the driving gear or the transmission gear as a fixed gear and the other as a moving gear, the transmission gear, and the driving gear. A pressure control device configured to be movable in the radial direction of the moving gear at a mesh release position for releasing the mesh.   A rotation operation unit that is swingable between a first position and a second position around an axis along the axial direction of the drive gear and the transmission gear, and the rotation operation unit is operated to the first position. Accordingly, the rotation operation unit moves the movement side gear to the meshing position, and moves the movement side gear to the meshing release position as the rotation operation unit is operated to the second position. The pressure control apparatus according to claim 1, further comprising a linkage mechanism that links the movement of the moving gear with the movement side gear.   The pressure control device according to claim 1, further comprising a return urging unit that urges the moving side gear toward the meshing position side or the opposite side.   The pressure control device according to any one of claims 1 to 3, further comprising: a lock mechanism that holds the movement side gear in at least one of the meshing position and the meshing release position.

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