JP2019040349A - Pressure regulating valve - Google Patents

Abstract

To provide a pressure regulating valve applicable to wide-range applications including drinking water, etc.SOLUTION: A pressure regulating valve includes: an inflow passage in which a process liquid subjected to a pressure regulation flows; an open/close mechanism 100 that opens and closes the inflow passage by separating/contacting motion; a shock absorbing liquid space 98 for storing a liquid that attenuates the separating/contacting motion of the opening/closing mechanism 100 by a viscosity resistance; and a communication passage 107 which is provided in the opening/closing mechanism 100 and which guides the process liquid to the shock absorbing liquid space 98. The communication passage 107 guides the process liquid to the shock absorbing liquid space 98, and the separating/contacting motion of the opening/closing mechanism 100 is attenuated by the viscosity resistance of the process liquid.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a pressure regulating valve that includes an inflow path through which a processing liquid flows and an opening / closing mechanism that opens and closes the inflow path by a separation movement, and adjusts the pressure of the processing liquid.

  Conventionally, a pressure regulating valve for adjusting the pressure of the liquid has been widely used. For example, the pressure regulating valve is connected to the discharge port of the pump and used for adjusting the discharge pressure of the liquid.

  In Patent Document 1, it has a fluid inlet, a fluid outlet, and a valve body provided with a biasing means for biasing the inlet in a direction to close the inlet. A body opens the inlet, the pressure of the fluid increases in response to an increase in fluid velocity, and the valve body closes the outlet when the fluid exceeds a second pressure, or the outlet A pressure regulating valve that increases damping force when a pressure larger than a predetermined value is applied to the high pressure side by narrowing is disclosed.

JP 2017-53402 A

  On the other hand, when the pressure regulating valve as described above is used for adjusting the discharge pressure of the reciprocating pump, the valve body vibrates against the valve seat and so-called ringing occurs. For such a problem, a method of reducing vibration by providing a damper is used. Such dampers use dedicated oils with high viscosity.

  However, there is a problem in that the use of the pressure regulating valve in which oil is used as the damper liquid is limited. For example, when a pump is used for water supply such as drinking water, the user has a tendency to refrain from selecting a pump in which the pressure regulating valve is used because of fear of mixing due to oil leakage of the damper.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a pressure regulating valve that can be applied to a wide range of uses including drinking water.

  A pressure regulating valve according to the present invention is a pressure regulating valve including an inflow path through which a processing liquid whose pressure is to be adjusted flows in and an open / close mechanism that opens and closes the inflow path by a separating movement. A shock absorbing liquid chamber that stores liquid that attenuates contact movement, and a guide path that is provided in the opening / closing mechanism and guides the processing liquid to the shock absorbing liquid chamber.

  In the present invention, the processing liquid is guided to the absorbing liquid chamber by the guide path, and the separation / contact movement of the opening / closing mechanism is attenuated by the viscous resistance of the processing liquid.

  The pressure regulating valve according to the present invention is characterized in that one end of the guide passage communicates with the inflow passage and the other end communicates with the suction liquid chamber, and is formed inside the opening / closing mechanism. .

  In the present invention, the processing liquid in the inflow path flows into the suction liquid chamber through the guide path formed inside the opening / closing mechanism, and the opening / closing mechanism is separated and connected by the viscous resistance of the processing liquid. Movement is damped.

  In the pressure regulating valve according to the present invention, the opening / closing mechanism includes a plate-like sliding portion that slides on the inner surface of the suction liquid chamber during the separation / contact movement, and the sliding portion has a thickness direction in the sliding portion. The through hole has a diameter of less than 1.5 mm.

  In the present invention, since the peripheral edge of the sliding portion slides on the inner surface of the shock absorbing liquid chamber, the treatment liquid in the shock absorbing liquid chamber passes only through the through hole of the sliding portion. Move from one side of the moving part to the other side. Since the through-hole has a diameter of less than 1.5 mm, the frictional resistance generated between the processing liquid and the through-hole is sufficiently large and weakens and dampens the separation / contact movement of the opening / closing mechanism.

  The pressure regulating valve according to the present invention includes a discharge path for discharging the gas in the suction liquid chamber to the outside.

  In the present invention, since the discharge passage discharges the gas in the suction liquid chamber to the outside, it can be prevented in advance that the gas causes trouble in adjusting the pressure of the processing liquid by the pressure regulating valve.

  The pressure regulating valve according to the present invention includes a valve seat provided in the discharge passage and a valve body biased by the valve seat by the liquid from the suction liquid chamber.

  In the present invention, the valve seat and the valve body are provided in the discharge path, and when the processing liquid flows out from the suction liquid chamber to the discharge path, the pressure of the processing liquid causes the The valve body closes the valve seat to prevent the processing liquid from flowing outside through the discharge path.

  ADVANTAGE OF THE INVENTION According to this invention, it can apply to the wide use including drinking water etc., and the restriction | limiting of the use in a pressure regulation valve can be suppressed as much as possible.

It is sectional drawing which shows the principal part structure of the plunger pump which concerns on this Embodiment. It is the figure which looked at the plunger pump which concerns on this Embodiment from the arrow direction of FIG. It is sectional drawing which shows the principal part structure of the pressure regulation valve which concerns on this Embodiment. FIG. 5 is a partial cross-sectional view showing the vicinity of an impact liquid chamber when the plunger pump according to the present embodiment is operating. In the pressure regulation valve which concerns on this Embodiment, it is a fragmentary sectional view explaining the effect | action of a valve body. FIG. 5 is a partial cross-sectional view for explaining the operation of the opening / closing mechanism in the pressure regulating valve according to the present embodiment.

Hereinafter, a pressure regulating valve according to an embodiment of the present invention will be described in detail with reference to the drawings, taking as an example a case where the pressure regulating valve is applied to a so-called plunger pump.
FIG. 1 is a cross-sectional view showing the main configuration of the plunger pump according to the present embodiment, and FIG. 2 is a view of the plunger pump according to the present embodiment as viewed from the direction of the arrow in FIG. In the figure, the symbol P indicates a plunger pump according to the present embodiment.

  The plunger pump P includes a crankcase 10 having a bottomed cylindrical shape, a crank mechanism 1 accommodated in the crankcase 10, and a cylinder disposed coaxially with the crankcase 10 on the opening 10 a side of the crankcase 10. 20 and a plunger 6 that reciprocates in the cylinder 20 by driving the crank mechanism 1.

  The crank mechanism 1 includes a crankshaft 2 connected to a driving shaft (not shown), a guide 4 connected to the crankshaft 2 via a connecting rod 3, and a piston 5 guided by the guide 4. The guide 4 has a column shape. A cylindrical cylinder chamber 22 is provided inside the cylinder 20.

  The crankshaft 2 is located on the bottom side of the crankcase 10. In the crankcase 10, a guide passage 4 a is provided on the opening 10 a side of the crankcase 10. The guide 4 and the piston 5 are juxtaposed in the axial direction of the crankcase 10 in the guide passage 4a. One end of the connecting rod 3 is connected to the crankshaft 2, and the other end is connected to the guide 4. One end of a piston 5 is connected to the guide 4, and the other end of the piston 5 is connected to a plunger 6. The rotation of the driving shaft is converted into a reciprocating motion in the axial direction of the crankcase 10 by the crankshaft 2, the connecting rod 3, the guide 4 and the piston 5, and the plunger 6 is moved into the guide passage 4a and the cylinder 20 (cylinder chamber 22). Is reciprocated along the axial direction.

  The cylinder 20 is provided with a casing 40 having a suction port 21 for sucking liquid and a discharge port 40a for discharging liquid. The casing 40 is located on the opposite side of the crankcase 10 with the cylinder 20 in between.

  For example, a nozzle device (not shown) is connected to the discharge port 40a, and the liquid discharged from the discharge port 40a is ejected. The suction port 21 is connected to a tank (not shown) that stores a liquid to be ejected by the nozzle (hereinafter, processing liquid).

  The crankcase 10, the cylinder 20, and the casing 40 are detachably connected by a plurality of stud bolts 50 and nuts 51.

  Inside the casing 40, a liquid chamber 45 for temporarily storing the processing liquid is provided. The liquid chamber 45 communicates with the discharge port 40a. A discharge valve 40b having a check valve is interposed between the liquid chamber 45 and the discharge port 40a. The discharge valve 40b opens when the liquid chamber 45 has a positive pressure, and closes when the liquid chamber 45 has a negative pressure.

  The suction port 21 and the liquid chamber 45 communicate with each other. Specifically, the suction port 21 communicates with the liquid chamber 45 via a suction valve 25 having a check valve. The suction valve 25 is closed when the liquid chamber 45 is positive pressure, and is opened when the liquid chamber 45 is negative pressure.

  Further, the cylinder 20 is provided with a passage 23 connecting the cylinder chamber 22 and the suction port 21. The processing liquid in the cylinder chamber 22 enters the passage 23 and reaches the suction port 21.

  When the plunger 6 moves to the crankcase 10 side, the liquid chamber 45 becomes negative pressure, the discharge valve 40b is closed, the suction valve 25 is opened, the processing liquid is sucked from the suction port 21, and flows into the liquid chamber 45. When the plunger 6 moves to the casing 40 side, the liquid chamber 45 becomes positive pressure, the discharge valve 40b is opened, and the suction valve 25 is closed. The processing liquid in the liquid chamber 45 is discharged from the discharge port 40a.

  When the processing liquid in the liquid chamber 45 enters the cylinder chamber 22, the processing liquid that has entered passes through the passage 23 and returns to the suction port 21.

  As shown in FIG. 2, the plunger pump P includes a plurality of discharge ports 40a. A pressure regulating valve according to the present embodiment is attached to any one of the discharge ports 40a. FIG. 3 is a cross-sectional view showing the main configuration of the pressure regulating valve according to the present embodiment. In the figure, reference numeral 7 denotes a pressure regulating valve according to the present embodiment.

  The pressure regulating valve 7 is connected to one of the discharge ports 40a and adjusts the discharge pressure. Specifically, since the plunger pump P is driven using a prime mover, the plunger pump P tries to rotate at a constant rotational speed regardless of the pressure of the processing liquid. Therefore, the pressure regulating valve 7 adjusts the pressure of the processing liquid to keep it constant. Moreover, the pressure regulating valve 7 prevents the pressure of the processing liquid from rising excessively when the injection of the processing liquid suddenly stops in the nozzle device while the prime mover is operating. Preventing damage in advance.

  The pressure regulating valve 7 according to the present embodiment includes a body portion 9 that bypasses the processing liquid and a pressure adjustment portion 8 that adjusts the pressure of the processing liquid.

  The body portion 9 includes a housing 95. An inflow port 91 is formed in the housing 95. The inflow port 91 is disposed on the discharge port 40 a side, and the processing liquid flows into the body portion 9 through the inflow port 91.

  A cylinder-shaped inflow path 92 is connected to the inflow port 91 in the body portion 9, and the processing liquid that has flowed into the inflow port 91 flows into the inflow path 92. That is, the inflow path 92 has an inflow port 91 at one end. The inflow path 92 is provided with a cylindrical valve seat 93 at the other end. The inflow path 92 and the valve seat 93 are juxtaposed around the same axis. Hereinafter, the juxtaposed direction of the inflow path 92 and the valve seat 93 is referred to as the up-down direction.

  Further, the body portion 9 is formed with a storage chamber 94 for storing the processing liquid. The tip of the valve seat 93 communicates with the storage chamber 94, and the processing liquid flowing out from the valve seat 93 is temporarily stored in the storage chamber 94.

  A bypass circuit 96 that bypasses the processing liquid in the storage chamber 94 to the tank is formed. The bypass 96 has a cylinder shape, and one end communicates with the storage chamber 94. The bypass 96 is formed along the crossing direction with the inflow channel 92, and a bypass 97 is formed at the other end. The bypass port 97 communicates with the tank via, for example, a hose.

  On the other hand, the pressure adjusting unit 8 includes an impact liquid chamber 98, an opening / closing mechanism 100, and the like. Specifically, an absorbing liquid chamber 98 is formed on the opposite side of the inflow path 92 across the storage chamber 94 in the vertical direction. For example, the suction liquid chamber 98 has a circular inner surface 981 in a cross-sectional view in a direction crossing the vertical direction, and stores a predetermined liquid. As will be described later, a part of the opening / closing mechanism 100 that opens and closes the inflow path 92 by a movement that separates from and comes into contact with the valve seat 93 (hereinafter also referred to as a separation movement) is accommodated in the suction liquid chamber 98. The absorbing liquid chamber 98 stores a liquid that uses the viscous resistance to attenuate the separation / contact movement of the opening / closing mechanism 100 in the vertical direction.

  Further, the suction liquid chamber 98 is covered with a guide portion 99 that guides the separation / contact movement of the opening / closing mechanism 100 while holding the opening / closing mechanism 100. Moreover, the guide part 99 seals the shock absorbing liquid chamber 98 to prevent liquid leakage. For example, the guide portion 99 has a cylindrical shape having a predetermined thickness, and is held by inserting the opening / closing mechanism 100 inside the guide portion 99, and the above-described separation / contact movement of the opening / closing mechanism 100 is guided. The

  Further, the housing 95 includes an opening / closing mechanism 100. The opening / closing mechanism 100 is provided so as to straddle the storage chamber 94 and the suction liquid chamber 98. The opening / closing mechanism 100 is juxtaposed around the same axis as the inflow path 92 and the valve seat 93. The opening / closing mechanism 100 includes a disk 101 disposed at the end of the valve seat 93 and a piston 102 that holds the disk 101.

  As described above, the opening / closing mechanism 100 is movable in the vertical direction. When the opening / closing mechanism 100 moves in such a vertical direction, the disk 101 of the opening / closing mechanism 100 comes in contact with and separates from the tip of the inflow path 92 (valve seat 93). The opening / closing mechanism 100 opens and closes the inflow path 92 by such a separation / contact movement.

  The disk 101 has a disk portion 106 that is larger than the opening 93a of the valve seat 93, and one surface of the disk portion 106 covers the valve seat 93 (opening 93a). In addition, a convex portion 108 that protrudes toward the piston 102 is provided at the center of the other surface of the disk portion 106.

  The piston 102 has a substantially rod shape, and one end portion on the disk 101 side is provided so as to penetrate a wall that blocks between the shock absorbing liquid chamber 98 and the storage chamber 94. Further, as described above, the other end portion of the piston 102 is held by the guide portion 99 so as to be movable in the vertical direction. Further, an intermediate part of the piston 102 is accommodated in the impact liquid chamber 98.

A concave portion 109 corresponding to the convex portion 108 of the disk 101 is formed at one end portion of the piston 102. The disc 101 is held by the piston 102 by the engagement between the concave portion 109 and the convex portion 108.
In the vertical direction, the size of the concave portion 109 of the piston 102 is larger than the size of the convex portion 108 of the disk 101, and a gap is formed between the concave portion 109 and the convex portion 108.

  The other end of the piston 102 is inserted and held inside the guide part 99 as described above. Moreover, since the guide part 99 has a certain size in the up-down direction, it is guided by the guide part 99 when the piston 102 moves apart.

  The intermediate portion of the piston 102 has a plate-like sliding portion 103 that slides on the inner surface 981 of the shock absorbing liquid chamber 98 during the separation / contact movement. That is, the shape and size of the sliding portion 103 in the direction intersecting the vertical direction are substantially equal to the shape and size of the inner surface 981 of the suction liquid chamber 98 as viewed from the vertical direction.

  The sliding part 103 has a through hole 104 that penetrates the sliding part 103 in the thickness direction, and the diameter of the through hole 104 is, for example, less than 1.5 mm. In the case where dedicated oil is used as the liquid stored in the suction liquid chamber 98, the diameter of the through hole 104 is 1.5 mm. However, in the pressure regulating valve 7 according to the present embodiment, processing is performed instead of oil as will be described later. Use liquid (non-oil). Since the viscosity of the treatment liquid is lower than that of oil, the diameter of the through hole 104 is less than 1.5 mm in order to increase the viscosity resistance, and a range that does not cause excessive viscosity resistance (for example, 1 mm to less than 1.5 mm). Need to be. Further, the number of through holes 104 is not limited to one, and a plurality of through holes 104 may be provided as necessary.

  An intervening portion 81 is provided at the other end of the piston 102. Further, a spring 82 is provided on the opposite side of the piston 102 across the interposition part 81 in the vertical direction. That is, the interposition part 81 is interposed between the spring 82 and the piston 102. The interposition part 81 is provided with a projecting part for engaging the spring 82 on the spring 82 side. One end of the cylindrical spring 82 is externally fitted to the projecting part of the interposition part 81, whereby the interposition part 81. Retained.

A pressure adjusting screw 83 is provided at the other end of the spring 82. The pressure adjusting screw 83 adjusts the pressure of the processing liquid discharged from the discharge port 40a.
The restoring force of the spring 82 is transmitted to the piston 102 via the interposition part 81. That is, the restoring force of the spring 82 urges the disc 101 of the piston 102 toward the valve seat 93 in the vertical direction. When the user appropriately tightens or loosens the pressure adjusting screw 83, the restoring force of the spring 82 changes, and the force applied to the disk 101 pressing the valve seat 93 fluctuates accordingly, so that the pressure of the processing liquid can be adjusted.

  The disk 101 closes the valve seat 93 by the restoring force of the spring 82 when the pressure of the processing liquid relating to the discharge port 40a (inflow path 92) is a predetermined set pressure or lower. However, when the pressure of the processing liquid related to the discharge port 40 a exceeds the set pressure, that is, when the pressure of the processing liquid related to the discharge port 40 a is larger than the restoring force of the spring 82, the disk 101 (opening / closing mechanism 100) moves the spring 82. The processing liquid flows out from the valve seat 93 and flows into the tank. Therefore, the pressure of the processing liquid relating to the discharge port 40a is reduced, and an excessive increase in pressure can be prevented. In addition, the opening / closing mechanism 100 (disk 101) repeatedly performs such a separation / contact movement, and the valve seat 93 is opened / closed, whereby the pressure of the processing liquid relating to the discharge port 40a can be kept substantially constant.

  However, when the opening / closing mechanism 100 performs the separation / contact movement, for example, the disc 101 collides with the valve seat 93 in a vibrational manner, so-called ringing occurs, and the user feels uncomfortable.

  On the other hand, in the pressure regulating valve 7 according to the present embodiment, the valve ringing is caused by attenuating the opening / closing movement of the opening / closing mechanism 100 in the vertical direction by using the viscous resistance of the liquid stored in the suction liquid chamber 98. Suppresses the occurrence of

  The shock absorbing liquid chamber 98 accommodates the sliding portion 103 of the opening / closing mechanism 100, and the shock absorbing liquid chamber 98 is filled with liquid when the plunger pump P is in operation. In this state, when the opening / closing mechanism 100 performs the separation / contact movement, as described above, the peripheral edge of the sliding portion 103 slides on the inner surface 981 of the shock absorbing liquid chamber 98, so that the liquid flows into the sliding portion 103. Only through the through hole 104, the sliding portion 103 moves from one surface side to the other surface side. At this time, a frictional resistance is generated between the liquid and the through-hole 104, and the contact / separation motion (energy) of the opening / closing mechanism 100 is converted into, for example, heat. As a result, the separation / contact movement of the opening / closing mechanism 100 is weakened and attenuated. Therefore, the occurrence of ringing can be suppressed as much as possible. That is, the liquid that fills the absorbing liquid chamber 98 serves as a so-called damper liquid.

  On the other hand, the disc 101 is formed with a through hole 105 penetrating the disc 101 in the vertical direction. The through hole 105 passes through the center of the disk portion 106 of the disk 101 and the center of the convex portion 108.

  In addition, a communication path 107 (guidance path) that connects the recess 109 and the suction liquid chamber 98 is formed at the one end of the piston 102. The communication path 107 is formed inside the piston 102 and includes a first communication path 107a and a second communication path 107b.

  The first communication passage 107a is a bottomed hole that is provided along the axis of the piston 102 at the bottom of the recess 109 of the piston 102 and extends in the vertical direction. One end of the first communication passage 107 a opens into the recess 109. The 2nd communicating path 107b is a bottomed hole extended in the direction which cross | intersects the 1st communicating path 107a. One end of the second communication passage 107 b opens to the shock absorbing liquid chamber 98. Further, the other end of the first communication path 107a and the other end of the second communication path 107b communicate with each other. Therefore, the recess 109 and the shock absorbing chamber 98 communicate with each other via the communication path 107.

  Since it has such a configuration, in the pressure regulating valve 7 according to the present embodiment, the suction liquid chamber 98 is filled with the processing liquid when the plunger pump P is in operation, and the processing liquid serves as a damper liquid. This will be described in detail below.

FIG. 4 is a partial cross-sectional view showing the vicinity of the shock absorbing liquid chamber 98 when the plunger pump P according to the present embodiment is in operation. In FIG. 4, the light dot portion represents the treatment liquid.
When the plunger pump P is operated, the processing liquid is sucked into the liquid chamber 45 from the tank through the suction port 21. As the pressure of the processing liquid in the liquid chamber 45 increases, the processing liquid also flows into the inflow path 92 of the pressure regulating valve 7 via the inflow port 91. When the inflow path 92 (up to the valve seat 93) is full, the processing liquid flows into the through hole 105 of the disk 101. The processing liquid that has passed through the through hole 105 is temporarily stored in the recess 109. Next, when the recess 109 is full, the processing liquid flows into the communication path 107. The processing liquid flows out into the suction liquid chamber 98 through the first communication path 107a and the second communication path 107b. Thereafter, the liquid is stored until the suction liquid chamber 98 is full.

From the above, in the pressure regulating valve 7 according to the present embodiment, it is not necessary to separately prepare the damper liquid in the shock absorbing liquid chamber 98. The treatment liquid is used as a damper liquid.
Furthermore, the application of the plunger pump P according to the present embodiment can be expanded. That is, when a dedicated oil or the like is used as the damper liquid of the shock absorbing liquid chamber 98, there is a possibility that such a damper liquid may leak, so that even if the damper liquid is not a harmful substance, the drinking water is the treatment liquid. There was a tendency that it was not used for use. However, in the pressure regulating valve 7 according to the present embodiment, since the processing liquid itself is used as the damper liquid, such a problem can be solved and the application is not limited.

  The pressure regulating valve 7 according to the present embodiment is not limited to the above description. The pressure regulating valve 7 according to the present embodiment further includes a discharge path 88 for discharging the gas in the suction liquid chamber 98 to the outside. Hereinafter, this will be described in detail with reference to FIG.

  A through hole 84 is formed on the inner surface 981 of the shock absorbing liquid chamber 98 so as to penetrate the shock absorbing liquid chamber 98 inward and outward, and the discharge path 88 is connected to the through hole 84. The discharge path 88 includes a gas valve 86, a valve body chamber 85, and a discharge hole 87.

  The gas valve 86 includes a spherical valve body 86 a housed in the valve body chamber 85, a valve seat 86 b that is in contact with and away from the valve body 86 a, and a spring 86 c that biases the valve body 86 a toward the through hole 84.

  The valve body chamber 85 is provided outside the impulse liquid chamber 98 and communicates with the through hole 84. The valve body 86a has a maximum cross-sectional area larger than that of the outer opening of the through hole 84, and opens and closes the through hole 84 by making contact with the outer opening of the through hole 84. The valve body chamber 85 has a cylinder shape and has a predetermined length in the direction of the separation / contact of the valve body 86a, and the dimension between the opposed inner surfaces is slightly larger than the diameter of the valve body 86a. Therefore, the valve body chamber 85 accommodates the valve body 86a and guides the movement of the contact.

  The discharge hole 87 extends in the direction of separation / contact of the valve body 86a (the axial direction of the through hole 84), and its end is bent. That is, the discharge hole 87 has an L shape as a whole. The discharge hole 87 communicates with the valve body chamber 85 via the valve seat 86b. In other words, in the discharge hole 87, the valve seat 86 b is provided around the edge on the valve body chamber 85 side, and the valve body chamber 85 communicates with the outside through the discharge hole 87.

  The spring 86 c is inserted into the discharge hole 87 and is arranged in parallel around the same axis as the valve body 86 a and the through hole 84. The restoring force of the spring 86c urges the valve body 86a in the direction in which the valve body 86a approaches the through hole 84 or in the direction away from the valve seat 86b. Therefore, the valve body 86 a reciprocates between the valve seat 86 b and the through hole 84.

  For example, when the restoring force of the spring 86 c is greater than the pressure of the treatment liquid in the suction liquid chamber 98, the valve body 86 a comes into contact with the through hole 84 and closes the through hole 84. Even when the valve body 86 a closes the through hole 84, the gas (the gas in the shock absorbing liquid chamber 98) can freely pass between the valve body 86 a and the through hole 84. The gas that has passed between the valve body 86 a and the through hole 84 is discharged to the outside through the valve body chamber 85 and the discharge hole 87.

FIG. 5 is a partial cross-sectional view for explaining the operation of the valve body 86a in the pressure regulating valve 7 according to the present embodiment. In FIG. 5, the light dot portion represents the processing liquid.
On the other hand, when the pressure of the processing liquid in the shock absorbing liquid chamber 98 is larger than the restoring force of the spring 86c, the valve body 86a is pushed by the processing liquid to leave the through hole 84 and is urged toward the valve seat 86b. At this time, the valve body 86a is pushed by the processing liquid flowing out from the through hole 84, contacts the valve seat 86b, and closes the discharge hole 87. Therefore, the processing liquid can be prevented from flowing outside through the discharge hole 87.

  Since the pressure regulating valve 7 according to the present embodiment has the above-described configuration, it is not necessary to separately provide a gas venting mechanism, and the pressure regulating valve 7 (plunger pump P) is made compact by reducing the number of parts. be able to.

  In general, when the operation of the plunger pump P is started, the gas (air) in the liquid chamber 45 gathers in the inflow path 92, and the exact operation of the opening / closing mechanism 100 is obstructed. For this reason, a gas venting mechanism that forcibly operates the opening / closing mechanism 100 to open the inflow path 92 is necessary.

  However, in the pressure regulating valve 7 according to the present embodiment, since the gas venting is naturally performed because of the configuration as described above, the gas venting mechanism can be omitted and the plunger pump P can be operated. The trouble of the user who operates such a gas venting mechanism can be saved.

  Further, the pressure regulating valve 7 prevents the plunger pump P from being damaged by diverting the processing liquid to the tank when the pressure of the processing liquid related to the discharge port 40a is excessively increased.

FIG. 6 is a partial cross-sectional view for explaining the operation of the opening / closing mechanism 100 in the pressure regulating valve 7 according to the present embodiment. In FIG. 6, the light dot portion represents the processing liquid.
When the pressure of the processing liquid related to the discharge port 40a becomes larger than the restoring force of the spring 82, the pressure of the processing liquid related to the discharge port 40a exceeds a predetermined set pressure. At this time, the processing liquid pushes up the disk 101 (opening / closing mechanism 100) toward the spring 82 (in the direction of the arrow in FIG. 6), and the processing liquid flows out from the valve seat 93 and is stored in the storage chamber 94. As a result, the pressure of the processing liquid relating to the discharge port 40a is lowered, so that an excessive increase in the pressure of the processing liquid can be prevented in advance. Thereafter, the processing liquid stored in the storage chamber 94 returns to the tank via, for example, a hose.

  Although the case where the discharge path 88 (and the through hole 84) is provided in the pressure regulating valve 7 according to the present embodiment has been described above, the present embodiment is not limited to this, and the discharge path 88 is It is not essential and can be omitted.

7 Pressure regulating valve 92 Inflow path 98 Absorption fluid chamber 100 Opening / closing mechanism 103 Sliding part 104 Through hole 107 Communication path

Claims (5)

In a pressure regulating valve comprising an inflow path through which a processing liquid whose pressure is to be adjusted flows in, and an opening / closing mechanism that opens and closes the inflow path by a separating movement,
An absorbing liquid chamber for storing a liquid that attenuates the separation / contact movement of the opening / closing mechanism by viscous resistance;
A pressure regulating valve provided in the opening / closing mechanism and including a guide path for guiding the processing liquid to the suction liquid chamber. The taxiway is
One end communicates with the inflow path, the other end communicates with the shock absorbing chamber,
The pressure regulating valve according to claim 1, wherein the pressure regulating valve is formed inside the opening / closing mechanism. The opening / closing mechanism includes a plate-like sliding portion that slides on the inner surface of the shock absorbing liquid chamber during the separation / contact movement,
The sliding portion has a through-hole penetrating the sliding portion in the thickness direction,
The pressure regulating valve according to claim 1, wherein the through hole has a diameter of less than 1.5 mm.   The pressure regulating valve according to any one of claims 1 to 3, further comprising a discharge path for discharging the gas in the suction liquid chamber to the outside. A valve seat provided in the discharge path;
The pressure regulating valve according to claim 4, further comprising a valve body that is urged toward the valve seat by liquid from the suction liquid chamber.

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