JP2017190827A - Pressure adjusting drain valve - Google Patents

Abstract

The present invention has two functions of a pressure regulating valve and a pressure increasing / decreasing pressure increasing / decreasing valve, which is reduced in size and stably maintains a set pressure of fluid to suppress pulsation. A pressure regulating drain valve (1) having a liquid chamber (3) in which an inlet (31) and an outlet (32) for a liquid Q for adjusting pressure are formed, and a liquid pressure adjusting mechanism (4) for adjusting the pressure of the liquid Q are provided. The liquid pressure adjustment mechanism 4 includes a valve body 34 that closes or opens the discharge port 32, an elastic member 5 that presses the valve body 34 by applying a predetermined pressing force P in the direction of closing the discharge port 32, and A supporting member 6 that supports the rear end portion of the elastic member 5; a pressing force adjusting mechanism F having a screw portion 63 that adjusts the pressing force P by moving the supporting member 6 back and forth in the pressing direction of the elastic member 5; And a step-up / down pressure mechanism T for the liquid Q having a piston cylinder mechanism 9 that reciprocally moves in the pressing direction. [Selection] Figure 1

Description

  The present invention relates to a pressure adjusting drain valve that adjusts the pressure of a liquid, and more particularly to a pressure adjusting drain valve that includes a liquid inlet and outlet for adjusting the pressure.

Generally, in a high-pressure liquid circuit that generates a high-pressure liquid such as high-pressure water by a high-pressure pump, there are two pressure regulation valves that adjust the pressure of the liquid, and step-up / down pressure valves (relief valves and drain valves) for boosting / decreasing pressure. Often used with two separate valves.
Conventionally, pressure regulating valves having two functions of a pressure regulating valve and a step-up / down pressure valve are known (for example, Patent Documents 1 and 2).

  The pressure regulating valve described in Patent Document 1 is provided with a control piston (12) that moves coaxially with the valve body (22), and can adjust the maximum pressure by changing the force of the valve spring. The control piston (12) can be repositioned relative to the valve body (22) by the pressure of the delivery pump (34).

  The pressure regulating valve described in Patent Document 2 controls a valve body (4) that opens and closes a valve hole (21) that opens in a flow path of high-pressure water by an air cylinder mechanism. The valve body (4) is pressed by the piston (52) constituting the air cylinder mechanism, and closes the valve hole (21) under a predetermined pressure. The moving speed of the piston (52) is controlled by a flow rate adjusting valve (57) that adjusts the outflow amount of the compressed air sealed in the empty space (51b) on the piston rod side.

JP-A-57-161374 (from the upper right column to the lower right column on page 3) Japanese Utility Model Publication No. 49-92526 (claims of utility model)

  However, in the pressure regulating valve described in Patent Document 1, since the position of the control piston (12) is adjusted by changing the pressure of the delivery pump (34), it is easily affected by pulsation, and is stable at the set pressure value. There was a problem that it was difficult to hold.

  In the pressure regulating valve described in Patent Document 2, when the air pressure of the compressed air that controls the movement of the piston constituting the air cylinder mechanism is unstable, the pressure of the high-pressure water fluctuates and is difficult to stabilize. was there.

  Accordingly, the present invention has two functions of a pressure adjusting valve for adjusting the pressure of the liquid with a single valve and a step-up / step-down pressure valve for increasing and decreasing the pressure in order to solve the above-described problems, and stably It is an object of the present invention to provide a pressure regulating drain valve that can raise the pressure to a set pressure and hold it.

  In order to solve the above problems, the invention according to claim 1 is directed to a liquid chamber in which a liquid inlet for adjusting pressure and a discharge outlet for discharging the liquid are formed, and a liquid at a predetermined flow rate is discharged from the discharge outlet. A pressure adjusting drain valve having a liquid pressure adjusting mechanism for adjusting the pressure of the liquid, the liquid pressure adjusting mechanism being disposed to be movable forward and backward with respect to the discharge port, and closing or opening the discharge port. A valve body, an elastic member that applies a predetermined pressing force in a direction to close the discharge port, and presses the valve body, a support member that supports a rear end portion of the elastic member, and the support member A pressing force adjusting mechanism having a threaded portion that adjusts the pressing force by advancing and retreating in the pressing direction of the elastic member; and a liquid pressure increasing / decreasing mechanism having a piston cylinder mechanism that reciprocally moves the support member in the pressing direction. To have prepared And butterflies.

  The pressure regulating drain valve according to the present invention includes a liquid chamber having an inlet for liquid (such as high-pressure water) for adjusting pressure and an outlet for discharging the liquid, thereby quickly discharging the liquid from the outlet. When the pressure of the liquid whose pressure is adjusted becomes higher than a predetermined pressure, the liquid at a predetermined flow rate is discharged from the discharge port to function as a drain valve that lowers the pressure to the lower pressure (pressure reduction operation). By providing the liquid pressure adjustment mechanism that adjusts the pressure of the liquid, it functions as a pressure adjustment valve that maintains the liquid pressure at a predetermined pressure (pressure increase operation and pressure adjustment operation).

  For this reason, the pressure regulating drain valve according to the present invention can be reduced in size and reduced in installation space by configuring the function as the step-up / down pressure valve and the function as the pressure regulating valve together.

  In the pressure adjusting drain valve according to the present invention, the liquid pressure adjusting mechanism includes an elastic member that applies a predetermined pressing force in a direction to close the discharge port and presses the valve body. Since the pressure can be stably applied, the liquid can be stably raised to the set pressure (pressure increase operation) and held (pressure adjustment operation). In addition, the liquid pressure adjusting mechanism includes a pressing force adjusting mechanism having a screw portion that adjusts the pressing force by moving the supporting member forward and backward, so that the pressing force is set to a predetermined value by moving the supporting member forward and backward with a simple configuration. Can be set (pressing force adjustment function by screw part).

  In addition, the pressure regulating drain valve according to the present invention includes a piston cylinder mechanism that reciprocates the support member in the pressing direction, so that the pressure raising operation and the pressure lowering operation of the liquid can be quickly performed.

  That is, by retracting the support member by the piston cylinder mechanism, the pressing force is released, the liquid is discharged from the discharge port, and a drain operation (step-down operation) can be performed quickly and reliably.

  Moreover, since the predetermined deflection amount can be given to the elastic member by advancing the support member in the pressing direction by the piston cylinder mechanism, the pressing force generated by the elastic member can be stably held. (Pressure increase operation and pressure adjustment operation).

  In this way, the pressure regulating drain valve according to the present invention has two functions of a pressure regulating valve that regulates the pressure of liquid with one valve and a step-up / step-down valve for boosting / decreasing pressure. Alternatively, it is not necessary to provide a relief valve (drain valve), and the liquid can be stably raised to a set pressure and held.

  The invention according to claim 2 is the pressure regulating drain valve according to claim 1, wherein the piston cylinder mechanism supplies pressure fluid to a cylinder, a piston housed in the cylinder, and a rear portion of the cylinder. A pressure fluid supply port for moving the piston in the forward direction, and a stopper member for restricting movement of the piston in the forward direction, and the support member is connected to the piston via the screw portion. It is characterized by that.

According to the second aspect of the present invention, the pressure fluid supply port for supplying the pressure fluid to the rear portion of the cylinder and moving the piston in the forward direction is provided, so that the pressure fluid such as compressed air is supplied from the pressure fluid supply port. The supporting member can be moved forward in the pressing direction by supplying.
Moreover, since the stopper member for restricting the movement of the piston in the forward direction can be provided, the advance end of the piston can be regulated with high accuracy, so that the amount of bending of the elastic member is regulated with high accuracy and the elastic member. It is possible to more stably hold the pressing force generated.

  Further, by discharging the pressure fluid from the pressure fluid supply port, the pressing force can be released and the liquid can be discharged from the discharge port.

  The invention according to claim 3 is the pressure regulating drain valve according to claim 1 or 2, wherein in the drain operation, the step-up / down mechanism releases the pressing force by retreating the support member. The liquid is discharged from a discharge port.

  According to the invention which concerns on Claim 3, the said pressing force can be open | released quickly and reliably by a piston cylinder mechanism, and the said liquid can be discharged | emitted from the said discharge port, and pressure-lowering can be carried out.

  The invention according to a fourth aspect is the pressure regulating drain valve according to any one of the first to third aspects, wherein in the pressure regulating operation, the liquid pressure regulating mechanism is supported by the step-up / down pressure mechanism. The member is supported while being moved in the pressing direction of the elastic member, and the valve body discharges a predetermined flow rate of liquid from the discharge port while receiving a pressing force in the direction of closing the discharge port by the elastic member. And adjusting the pressure of the liquid.

  According to the fourth aspect of the invention, the support member is supported in a state in which the support member is moved in the pressing direction of the elastic member by the step-up / step-down mechanism, so that a predetermined amount of bending is given to the elastic member. The pressing force generated by the member can be stably held.

  Further, by applying a predetermined pressing force in the direction of closing the discharge port and pressing the valve body, a predetermined flow rate of liquid is discharged from the discharge port according to the pressure of the liquid, and the pressure of the liquid Can be adjusted (pressure adjustment operation by sewage drain).

  The pressure adjusting drain according to the present invention has two functions of a pressure adjusting valve for adjusting the pressure of the liquid and a step-up / step-down valve for pressure increase / decrease, and a pressure control valve or a relief valve (drain valve) is provided separately. The liquid can be raised to the set pressure and held stably.

It is a front sectional view for explaining composition and operation of a pressure regulation drain valve concerning an embodiment of the present invention, and shows operation at the time of pressure rise and pressure regulation. It is front sectional drawing for demonstrating operation | movement of the pressure control drain valve which concerns on embodiment of this invention, and shows the mode of the total amount drain at the time of pressure reduction. It is front sectional drawing for demonstrating operation | movement of the pressure control drain valve which concerns on embodiment of this invention, and shows a mode when pressing force is adjusted (set) with a thread part.

  A pressure regulating drain valve 1 according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate. The pressure adjusting drain valve 1 is a drain valve with a pressure adjusting function for adjusting the pressure of a high-pressure liquid Q (high-pressure water) used in, for example, a water jet processing machine (not shown). The pressure adjusting drain valve 1 has two functions of a pressure adjusting valve and a step-up / down pressure valve (relief valve or drain valve) that controls pressure increase and pressure decrease.

  The liquid Q (high-pressure water) for adjusting the pressure is generated by, for example, a high-pressure pump (not shown) or the like and flows through a hydraulic pressure channel (not shown), and is an injection nozzle (not shown) of a water jet processing machine (not shown). ) Etc.

  As shown in FIG. 1, the pressure adjusting drain valve 1 includes a cylindrical housing 2, a liquid chamber 3 disposed at the tip of the housing 2 (downward in FIG. 1), and the pressure of the liquid Q And a liquid pressure adjusting mechanism 4 for adjusting the pressure.

  In the pressure regulating drain valve 1 according to this embodiment, for convenience of explanation, a portion where the liquid chamber 3 is disposed with respect to the central axis direction of the housing 2 is referred to as a front portion (downward in FIG. 1), and the opposite. The part on the side (upper side in FIG. 1) is called a rear part.

The housing 2 is a member that serves as a base for housing components such as the liquid pressure adjusting mechanism 4.
The liquid chamber 3 is a space for introducing the liquid Q flowing through a hydraulic pressure channel (not shown), and includes an inlet 31 for the liquid Q and an outlet 32 for discharging the liquid Q introduced from the inlet 31. It is equipped with.

  In the liquid chamber 3, the liquid Q flowing from the inlet 31 is discharged from the outlet 32. The liquid pressure adjusting mechanism 4 discharges a predetermined amount of the liquid Q1 from the discharge port 32 in accordance with the pressure of the liquid Q, and adjusts the pressure of the liquid Q (sewage drain).

  The liquid pressure adjusting mechanism 4 includes a valve seat 33 disposed at the opening edge of the discharge port 32, a valve body 34 that closes or opens the discharge port 32, and a predetermined pressing force P in the direction of closing the discharge port 32. The elastic member 5 that presses the valve body 34 by applying the pressure, the support member 6 that supports the rear end portion of the elastic member 5, and the support member 6 is advanced and retracted in the pressing direction of the elastic member 5 to adjust the pressing force P. A pressing force adjusting mechanism F having a threaded portion 63; and a liquid Q lifting / lowering mechanism T having a piston cylinder mechanism 9 that reciprocally moves the support member 6 in the pressing direction.

The valve seat 33 is an annular member having a shape along the opening edge of the discharge port 32.
The valve body 34 is connected to the valve portion 34a, a valve portion 34a that is inserted into the valve seat 33 and has a rod shape that closes the discharge port 32, a tapered portion 34b that is formed at the tip of the valve portion 34a, and the valve portion 34a. A disc-shaped valve body holding portion 34c. The valve body 34 is accommodated so as to be movable forward and backward with respect to the valve seat 33 so as to be guided by the inner peripheral portion of the housing 2.

  The tapered portion 34 b can be inserted so as to contact the inner peripheral portion of the valve seat 33 and close the discharge port 32. The valve body holding part 34c is brought into contact with the distal end portion of the elastic member 5 and receives a pressing force P (force for pressing the valve body 34 against the valve seat 33) generated by the elastic member 5.

  The taper portion 34b generates a component force that moves the valve body 34 upward when pressure from the liquid Q is received. This upward component force increases as the pressure of the liquid Q increases. Therefore, when the pressure of the liquid Q becomes higher and the component force becomes larger than the pressing force P, the valve body 34 gradually moves in the rearward direction with the increase of the pressure of the liquid Q, and the discharge port 32 is opened. The amount of sewage drain Q1 from the water also increases. Moreover, since the upward component force becomes small as the pressure of the liquid Q becomes low, the amount of the sewage drain Q1 from the discharge port 32 decreases.

  When the pressure of the liquid Q and the pressing force P are in a balanced state, the valve body 34 is fully opened while floating with respect to the discharge port 32. When the valve body 34 is fully opened, the liquid Q reaches a set pressure. In other words, since the valve body 34 moves to a position where the pressing force P is balanced with respect to the pressure of the liquid Q, the pressing force adjusting mechanism F causes the pressing force to be balanced so that the set pressure of the liquid Q and the pressing force P are balanced. By appropriately adjusting the size of P, the set pressure of the liquid Q can be adjusted.

  The elastic member 5 is a member that generates a pressing force P by elastic deformation such as bending and torsion, and various spring members such as a coil spring and a rubber spring can be used. The elastic member 5 is accommodated in the housing 2 so that the tip of the elastic member 5 abuts the valve body holding portion 34c.

The support member 6 includes an elastic member holding portion 61 having a disc-shaped tip, a shaft member 62 erected along the axial direction of the housing 2 from the center of the elastic member holding portion 61, and the shaft member 62. And a screw part 63 formed on the surface.
The elastic member holding portion 61 is in contact with the rear end portion of the elastic member 5. The screw portion 63 is a connecting means for connecting the support member 6 and the piston 92 constituting the piston cylinder mechanism 9 and adjusting the distance (positional relationship) between the piston cylinder mechanism 9 and the elastic member holding portion 61.

  With this configuration, the elastic member 5 has an outer peripheral portion guided inside the housing 2, a front end portion supported by the valve body holding portion 34 c, and a rear end portion supported by the elastic member holding portion 61.

<Bucking pressure mechanism>
When the pressure increasing / decreasing mechanism T performs the pressure increasing operation and the pressure adjusting operation, the piston / cylinder mechanism 9 moves the support member 6 in the pressing direction of the elastic member 5. After the pressure increase, when the pressure of the liquid Q becomes higher than the set value, the process proceeds to a pressure adjustment operation for discharging the liquid Q1 at a predetermined flow rate from the discharge port 32 and adjusting the pressure of the liquid Q.

On the other hand, in the case of performing a drain operation (total drainage) as a step-down operation, as shown in FIG. 2, the support member 6 is moved backward to release the pressing force P, and the valve body 34 is moved in the rear direction to discharge the outlet. 32 is opened and the liquid Q2 is discharged.
The drain operation (total drainage) may be performed by the operator at the end of the work, or may be performed automatically by setting a predetermined drain pressure in advance and detecting that the drain pressure has been reached. Good. The predetermined drain pressure is appropriately set by initial setting or the like according to the purpose and specification of the use of the pressure adjusting drain valve 1.

  As shown in FIG. 1, the piston cylinder mechanism 9 includes a cylinder 91 fixed to the rear portion of the housing 2, a piston 92 that is reciprocally movable in the axial direction of the housing 2 in the cylinder 91, and a piston A screw hole 93 formed in the axial direction of 92 and a pressure fluid supply port 94 for moving the piston 92 in the forward direction are provided.

  The piston cylinder mechanism 9 supplies the compressed air A, which is a pressure fluid, from the pressure fluid supply port 94 into the cylinder 91 by a control device (not shown) to move the piston 92 in the forward direction. When the compressed air A is released from the cylinder 91, the piston 92 moves in the backward direction. When the piston 92 is moved in the forward direction, the discharge port 32 can be closed. When the piston 92 moves in the backward direction, the discharge port 32 is opened (see FIG. 3).

  The “state in which the discharge port 32 can be closed” is a state in which the pressing force P is applied in a state in which the piston 92 moves in the forward direction and can close the discharge port 32. A state in which a predetermined amount of the liquid Q1 is discharged from the discharge port 32 according to the pressure of the liquid Q (residual drainage) is included. That is, it includes a state (pressure adjustment operation) in which the discharge port 32 is opened by the liquid pressure adjustment mechanism 4 and the drainage is performed during the pressure increase operation.

  The cylinder 91 guides the front wall 91a that is a stopper member that restricts the movement of the piston 92 in the forward direction, the rear wall 91b that restricts the movement of the piston 92 in the backward direction, and the outer periphery of the piston 92 so as to be reciprocally movable. A guide wall 91c.

The piston 92 includes a main body portion 92a formed in a disk shape, a boss portion 92b formed to protrude rearward from the main body portion 92a, and a seal member 92c disposed on the outer peripheral portion of the main body portion 92a. Yes.
The screw hole 93 is formed in the boss portion 92b. The screw hole 93 is screwed with the screw portion 63. The pressing force adjusting mechanism F functions by screwing the screw hole 93 and the screw part 63 together.

<Pressure adjusting mechanism>
The pressing force adjustment mechanism F is a mechanism that adjusts the pressing force P by which the elastic member 5 biases the valve body 34 toward the valve seat 33. With this configuration, the screw portion 63 is rotated with respect to the piston 92 to advance and retract the support member 6 in the pressing direction of the elastic member 5 to adjust the pressing force P.

  Specifically, when the pressure of the liquid Q is set high, the pressing force P by the elastic member 5 is increased by screwing the screw portion 63 in the forward direction. As shown in FIG. 3, when the pressure of the liquid Q is desired to be set low, the screw portion 63 is moved in the backward direction to reduce the pressing force P1 by the elastic member 5 (P1 <P).

  For example, as shown in FIG. 3, the screw member 63 is moved in the backward direction and the pressure of the liquid Q is set low, and then the screw member 63 is screwed in the forward direction as shown in FIG. 5 is increased, and the pressure of the liquid Q is set. When the pressing force P of the elastic member 5 is set to be larger than the pressing force P1 shown in FIG. 3 (P1 <P), the discharge amount of the predetermined amount of the liquid Q1 discharged from the discharge port 32 decreases, so that the liquid Q The pressure increases.

The operation of the pressure regulating drain valve 1 configured as described above will be described with reference to FIGS.
As shown in FIG. 1, the pressure adjusting drain valve 1 supplies the compressed air A from the pressure fluid supply port 94 into the cylinder 91 by the piston cylinder mechanism 9 when the pressure increasing operation and the pressure adjusting operation are performed. Is brought into contact with the front wall 91a to move the support member 6 in the forward direction.

  When the support member 6 is moved in the forward direction (the pressing direction of the elastic member 5), the elastic member 5 is pressed and a pressing force P is generated. Thus, the valve body 34 closes the discharge port 32 by the pressing force P of the elastic member 5 supported by the support member 6.

  At this time, since the discharge port 32 is closed with a predetermined pressing force P set by the pressing force adjusting mechanism F, when the pressure of the liquid Q becomes higher than a set value, the liquids Q1 and Q2 having a predetermined flow rate are discharged from the discharge port 32. Then, the pressure of the liquid Q is adjusted (pressure adjusting operation by the spill drain).

[All drain operation]
On the other hand, when performing a drain operation (total amount drain), the pressure adjusting drain valve 1 is compressed air from the pressure fluid supply port 94 by a piston cylinder mechanism 9 constituting a step-up / step-down mechanism T as shown in FIG. By opening A, the piston 92 is moved so as to contact the rear wall 91b, and the support member 6 is moved backward. By retracting the support member 6, the discharge port 32 is opened, and the liquid Q <b> 3 is discharged from the opened discharge port 32.

The pressure regulating drain valve 1 according to the present embodiment configured as described above has the following operational effects.
That is, the pressure adjusting drain valve 1 causes the piston member mechanism 9 to retract the support member 6 to release the pressing force P against the discharge port 32 and discharge the liquid Q3 from the discharge port 32, thereby quickly and reliably performing the drain operation. (Step-down operation) can be performed.

  Further, as shown in FIGS. 1 and 2, the piston cylinder mechanism 9 gives a predetermined amount of bending to the elastic member 5 even during the pressure increasing operation, and stably holds the pressing force P generated by the elastic member 5. Yes (step-up operation).

  In this way, the pressure regulating drain valve 1 has two functions of a pressure regulating valve that regulates the pressure of the liquid Q with a single valve, and a step-up / down pressure valve (drain valve) for boosting and lowering. The liquid Q can be stably raised to the set pressure and held without providing a pressure adjusting valve or a relief valve.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be implemented with appropriate modifications.
For example, in the present embodiment, the compressed air A is used as the pressure fluid for operating the piston cylinder mechanism 9, but the present invention is not limited to this and may be operated hydraulically.

DESCRIPTION OF SYMBOLS 1 Pressure adjustment drain valve 2 Housing | casing 3 Liquid chamber 4 Liquid pressure adjustment mechanism 5 Elastic member 6 Support member 9 Piston cylinder mechanism 31 Inlet 32 Discharge port 33 Valve seat 34 Valve body 34a Valve part 34b Taper part 34c Valve body holding part 61 Elastic member holding part 62 Shaft member 63 Screw part 91 Cylinder 91a Front wall (stopper member)
91b Rear wall 92 Piston 93 Screw hole 94 Pressure fluid supply port A Compressed air (pressure fluid)
F Pressure adjusting mechanism P, P1 Pressure Q, Q1, Q2 Liquid T Lifting pressure mechanism

Claims (4)

A liquid chamber having a liquid inlet for adjusting pressure and an outlet for discharging the liquid; and
A pressure adjustment drain valve having a liquid pressure adjustment mechanism that discharges a predetermined flow rate of liquid from the discharge port and adjusts the pressure of the liquid,
The liquid pressure adjusting mechanism is
A valve body that is disposed so as to be movable back and forth with respect to the discharge port, and closes or opens the discharge port;
An elastic member that applies a predetermined pressing force in a direction to close the discharge port and presses the valve body;
A support member for supporting a rear end portion of the elastic member;
A pressing force adjusting mechanism having a screw portion that adjusts the pressing force by moving the supporting member forward and backward in the pressing direction of the elastic member;
A liquid pressure increasing / decreasing mechanism having a piston cylinder mechanism for reciprocating the support member in the pressing direction;
A pressure regulating drain valve characterized by comprising: The piston cylinder mechanism includes a cylinder, a piston housed in the cylinder, a pressure fluid supply port for supplying a pressure fluid to a rear portion of the cylinder and moving the piston in a forward direction, and a forward direction of the piston. A stopper member for restricting movement,
The support member is connected to the piston via the screw portion;
The pressure regulating drain valve according to claim 1. In the drain operation, the step-up / step-down mechanism retreats the support member to release the pressing force and discharge the liquid from the discharge port.
The pressure regulating drain valve according to claim 1 or 2, wherein In the pressure adjustment operation, the liquid pressure adjustment mechanism supports the support member in a state where the support member is moved in the pressing direction of the elastic member by the step-up / down pressure mechanism, and the valve body closes the discharge port by the elastic member. Adjusting the pressure of the liquid by discharging a predetermined flow rate of liquid from the outlet while receiving a pressing force in the direction of
The pressure regulating drain valve according to any one of claims 1 to 3, wherein:

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