JPH10132114A - Pressure regulating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain the temperature of a valve element, which is seated and separated on/from a valve seat for regulating pressure at a section regulated to a preset regulating value, and the valve seat from rising for improvement of the accuracy of the present regulating value of a regulating device by fitting the valve element and cooling a range including the valve element and the valve seat by a cooling means. SOLUTION: During the operation of an extra-high pressure pump, the water supplied to a cooling water passage 62 for a regulating device cools a valve seat 78 cools a valve element 80 and the like while passing through a body 70. The valve element 80 is seated and separated on/from the valve seat 78 by the force which affects the valve element 80 from a belleville spring train 88, and the force which affects the lower end of the valve element 80 from the hydraulic pressure of a through hole 79 to regulate the hydraulic pressure of a discharging opening 66 to a preset regulating value. To change the present regulating value, an operating screw 90 is turned, so that the preload of the belleville spring train 88 is changed. At this time, the valve element 94 of a flow control valve 92 is also turned through a gear 96. A valve element 94 is moved in the axial direction for an increase in cooling performance so that the flowing cross section of a cooling water passage 62 may increase more as the preset regulating value of the regulating device 48 is larger.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure regulator for regulating the discharge pressure of an ultra-high pressure pump, and more particularly to a pressure regulator having improved accuracy.

[0002]

2. Description of the Related Art A conventional pressure regulating device (48) for adjusting the discharge pressure of an ultra-high pressure pump has no measures against temperature.

[0003]

The temperature of the water discharged from the pump rises as the discharge pressure increases. For example, when the water absorption temperature is 23 ° C., the temperature of the discharged water is: Discharge pressure is 120MPa, 150MPa, and 200MPa
At 50 ° C., 57 ° C., and 68 ° C., respectively.

[0004] The pressure regulator causes fluctuations in pressure regulation value, loosening of mounting bolts, and deterioration of O-rings due to a difference in expansion coefficient between parts made of different materials with an increase in temperature. Connect.

An object of the present invention is to provide a pressure regulating device which can overcome such problems.

[0006]

A pressure adjusting device (48) according to the present invention.
Has the following elements (a) and (b): (A) A valve element (80) that is seated on and separate from the valve seat (78) to adjust the pressure of the pressure-regulated point (66) to a set pressure adjustment value. (B) At least the valve element (80) and the valve seat Cooling means (62) for cooling the area including (78)

When the pressure is adjusted by the pressure adjusting device (48), the fluid (16)
As it passes between the valve body (80) and the valve seat (78),
The temperature rises, causing the temperature of the pressure regulator (48) to rise. The cooling means (62) cools the valve body (80) and the valve seat (78) and suppresses a temperature rise thereof. Thus, the valve body (80)
In addition, the temperature rise of the valve seat (78) is suppressed, and the accuracy of the set pressure value of the pressure regulator (48) is improved.

[0008] Another pressure regulating device (48) of the present invention further comprises:
It has the following elements (c) and (d). (C) a pressure adjustment value setting means (90) for adjusting the set pressure adjustment value; (d) in conjunction with the pressure adjustment value setting means (90), the refrigerant (62) of the cooling means (62) increases as the set pressure adjustment value increases. Cooling power control means (92) for increasing the flow rate of (16)

In the case of adjusting the discharge pressure of the ultrahigh pressure pump (30), the higher the pressure adjustment value, the higher the temperature of the fluid (16). The cooling power control means (92)
The flow rate of the refrigerant (16) of the cooling means (62) is increased to cope with an increase in the temperature of the fluid (16) accompanying an increase in the set pressure regulation value.

According to another pressure regulating device (48) of the present invention, the pressure-regulated portion (66) is the discharge portion (66) of the ultra-high pressure pump (30), and the cooling means (62) is The fluid (16) from the booster pump (18) that sends the fluid (16) to the suction part (32) of the high-pressure pump (30) is used as the refrigerant (16).

In this specification, an ultra-high pressure pump (3
0) is defined as a discharge pressure of 1000 kgf / square cm or more.

The ultra-high pressure pump (30) is a booster pump (18)
The fluid (16) sucked in from is pressurized and discharged. The cooling means (62) is supplied with the fluid (16) from the booster pump (18), and uses the fluid (16) as the refrigerant (16). Booster pump (18) that supplies fluid (16) to ultra-high pressure pump (30)
Can also be used to supply the fluid (16) as the refrigerant (16) to the cooling means (62), and the structure can be simplified.

Another pressure regulating device (48) of the present invention has the following elements (e) and (f). (E) temperature difference detection means (63) for detecting the difference between the temperature of the fluid (16) after being used in the cooling means (62) and the suction fluid temperature of the ultrahigh pressure pump (30); Pressure change value detecting means for detecting a change in the pressure value based on the output change of the means (63)

The difference Ts between the temperature of the fluid (16) after being used in the cooling means (62) and the suction fluid temperature of the ultrahigh pressure pump (30) is:
It has a certain relationship with the fluctuation of the discharge pressure of the ultrahigh pressure pump (30), that is, the actual pressure adjustment value of the pressure adjustment device (48). The pressure regulating device (48) operates the pressure regulating device (4) regardless of the set pressure regulating value.
Although the actual pressure regulation value changes with the temperature change of 8), the variation of the actual pressure regulation value of the pressure regulator (48) can be roughly detected from the variation of the temperature difference Ts.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 5 is an overall schematic view of an underwater nozzle device 10 for generating cavitation bubbles. The tank 12 is supplied with water 16 from a tap faucet 14 and stores the water 16 at a predetermined level. The booster pump 18 sucks the water 16 in the tank 12 via the strainer 20 and discharges it to the water supply passage 24 via the filter 22. Water pressure gauges 26 and 28 are each a filter
22 are provided on the booster pump 18 side and the water supply passage 24 side,
Measure the water pressure. The ultra-high pressure pump 30 has a suction port 32 and a discharge port 66 (FIG. 6) on the base end side and the distal end side, respectively. The suction port 32 is connected to the water supply passage 24, and the discharge port 66 is connected to the discharge passage 34. I have. The pulleys 38 and 40 are attached to the output shaft and the crankshaft of the motor 36, respectively, and are hung by a belt 42. The ultrahigh-pressure pump 30 is driven by the rotating power transmitted from the motor 36. The safety valve 44 is attached to one side of the ultra-high pressure pump 30, and limits the hydraulic pressure of the discharge passage 34 to a value equal to or less than an allowable value. The water pressure gauge 46 measures the discharge pressure of the ultra-high pressure pump 30. The pressure regulator 48 is attached to the other side of the ultra-high pressure pump 30, and adjusts the discharge pressure of the ultra-high pressure pump 30 to a set value. The remote control handle 50 is disposed at a location remote from the pressure regulator 48 and is manually rotated. The rotational displacement of the remote control handle 50 is transmitted to the pressure regulator 48 via the flexible shaft 52. The set pressure value of the pressure control device 48 is changed by the remote control handle 50. The tank 54 stores the water 16 at a predetermined level.
The water is submerged in the water 16 of the tank 54, and the water 16 that is pressure-fed from the ultrahigh-pressure pump 30 through the discharge passage 34 is jetted at an ultrahigh pressure. By such an ultra-high pressure injection, cavitation bubbles are generated in the water 16 in the tank 54, and the work is washed and the work is washed. The water supply passage 24 side of the filter 22 is connected to a sealing cooling water passage 60 via a flow rate adjusting needle valve 58, and the sealing portion of the ultra-high pressure pump 30 is connected to the sealing cooling water passage.
It is cooled by water 16 passing through 60. The water supply passage 24 side of the filter 22 is further connected to a pressure control device cooling water channel 62 so that the water 16 from the booster pump 18 is also supplied to the pressure control device 48. The water temperature sensor 63 is a pressure regulator
The temperature of the water 16 which is attached to the pressure control device cooling water channel 62 downstream of the pressure control device 48 and has been cooled by the pressure control device 48 is detected.

FIG. 6 is a view of the ultra-high pressure pump 30 as viewed from the manifold 64 side. The manifold 64 is located on the left and right sides,
A body 68 of the safety valve 44 and a body 70 of the pressure regulator 48 are provided with a pair of discharge ports 66 communicating with each other. Joined to. The plugs 72 are detachably screwed to the portions of the bodies 68 and 70 where the through holes formed therein open to the wall surface. A predetermined passage to the discharge port 66 of the ultra-high pressure pump 30,
For example, when connecting the discharge passage 34 (FIG. 5), the body 6
Either one or both of the plugs 72 are removed, and the conduit is connected thereto.

FIG. 1, FIG. 2 and FIG.
4 is a cross-sectional view of the body 70 at a height where the flow dividing portion 104 is connected to the body 70 in FIG. The valve seat 78 is inserted into the body 70 from above the body 70, and communicates with the connection port 82 through a through hole 79 hanging down from the valve seat 78. The valve body 80 is displaced in the up-down direction, seats on and separates from the valve seat 78, and opens and closes the valve seat 78.
The connection port 82 opens on the joint side surface of the body 70 and is connected to the discharge port 66 of the manifold 64. O-ring 84 is a connection port
It is fitted in the annular groove on the side surface of the body 70 so as to include 82 inside in the radial direction, and seals the joint between the manifold 64 and the body 70. The O-ring 85 is fitted in an annular groove on the lower surface of the valve seat 78, and seals a joint surface between the body 70 and the valve seat 78. The spill port 86 opens on the side surface of the body 70 opposite to the connection port 82, and communicates with the connection port 82 via the valve seat 78 and the through hole 79. The disc spring row 88 is disposed in the body 89 joined to the upper surface side of the body 70 with the center line aligned with the center line of the valve seat 78, and biases the valve seat 78 toward the valve body 80. . Operation screw 90
Is screwed into the body 89, and changes the amount of advance and retreat toward the disc spring row 88 with the rotation, whereby the preload of the disc spring row 88,
That is, the set pressure adjustment value of the pressure adjustment device 48 is adjusted. Reducer 91
Is a bracket whose lower end is fixed to the upper surface of the body 89
The input shaft 93 is fixed to the upper surface of the projection 95, and the input shaft 93 is protruded to the side. Input shaft
The flexible shaft 52 (FIG. 5) is connected to 93,
Handle 50 for remote control via flexible shaft 52
The rotation shown in FIG. 5 is transmitted. The flow control valve 92 is disposed in the cooling water passage 62 for the pressure regulator, and controls the flow cross-sectional area of the cooling water passage 62 for the pressure regulator by the axial displacement of the valve element 94. The gears 96 and 98 are integrally attached to the operation screw 90 and the upper end of the valve body 94 in the rotational direction, and mesh with each other. L-shaped through holes 100 and 102
A hole is formed in the body 70 below the valve seat 78, avoiding the through hole 79. Before reaching the body 70, the pressure regulator cooling water passage 62 is divided into flow dividing portions 104 and 106, and the body 70 has L-shaped through holes 100 and 102, and further has flow dividing portions 108 and 110.

The operation of the pressure regulator 48 will be described. During operation of the ultra-high pressure pump 30, the booster pump 18 is also maintained in the operating state, and the water 16 in the tank 12 is sucked by the booster pump 18 and a part of the water 16 is supplied to the pressure regulator cooling water channel 62. The water 16 supplied to the pressure regulator cooling water channel 62 is
When passing through the L-shaped through holes 100 and 102 in the body 70, the body 70, in particular, the valve seat 78, the valve body 80 and the O-rings 84 and 85 of the body 70 are cooled and discharged through the branch parts 108 and 110. . Valve seat 78 and valve body
The cooling of 80 suppresses the fluctuation of the set pressure regulation value due to the difference between the coefficients of thermal expansion. The cooling of the O-rings 84, 85 suppresses their deterioration.

The valve body 80 is formed by the force in the seating direction applied to the valve seat 78 from the disc spring row 88 to the valve body 80 and the water pressure in the through hole 79.
It receives the force in the direction away from the valve seat 78 exerted on the lower end of the valve seat 80 facing each other, and, depending on the relationship between the forces, sits on or separates from the valve seat 78, and thereby the discharge port 66 Is adjusted to a set pressure adjustment value related to the preload of the disc spring row 88. The set pressure adjustment value of the pressure adjustment device 48 is changed by rotating the remote control handle 50. That is, the rotation of the remote control handle 50 is transmitted to the input shaft 93 via the flexible shaft 52, and the operation screw 90 rotates to rotate the disc spring train 88.
Is changed, and as a result, the set pressure adjustment value of the pressure adjustment device 48 is changed.

On the other hand, with the rotation of the operation screw 90, the gear 96 rotates and the valve element 94 of the flow control valve 92 also rotates. Valve element 94
Is displaced in the axial direction by rotation, and the axial position where the flow cross-sectional area of the cooling water passage 62 for the pressure adjusting device increases as the set pressure adjusting value of the pressure adjusting device 48 increases. Thereby, the flow rate of the water 16 flowing through the L-shaped through holes 100 and 102 of the body 70 increases, and the cooling capacity increases. As the set pressure value of the pressure regulator 48 increases, the temperature of the water 16 passing between the valve seat 78 and the valve body 80 increases, and accordingly, the temperature of the body 70 also tends to increase. Since the cooling capacity increases due to the increase in the flow rate of the flow control valve 92, the rise in the temperature of the body 70 due to the increase in the set pressure value of the pressure regulator 48 is suppressed.

FIG. 7 shows the actual pressure value P of the pressure regulator 48 at a predetermined cooling water flow rate, the temperature T of the water 16 (= processed cooling water) discharged from the pressure regulator cooling water channel 62, and 6 is a graph showing the relationship of. T1 is the temperature of the water 16 (= water 16 sucked by the ultrahigh pressure pump 30) before being introduced into the cooling water passage 62 for the pressure regulator. It is understood from FIG. 7 that the temperature difference Ts (= T−T1) and the actual pressure regulation value P have a substantially proportional relationship. Further, the actual pressure value of the pressure regulator 48 changes due to a temperature change of the pressure regulator 48 after the adjustment by the remote control handle 50 is completed. Temperature T of water 16 coming out after cooling in pressure regulator 48
Is measured by the water temperature sensor 63 (FIG. 5), and Ts (= T−
T1. T1 can be measured by providing an always-installed temperature sensor in the water supply passage 24 or the tank 12, or by submerging a thermometer in the water 16 of the tank 12 before starting operation. ) By monitoring the fluctuation, the actual fluctuation of the pressure regulation value P can be roughly known.

[Brief description of the drawings]

FIG. 1 is a front view of a pressure adjusting device.

FIG. 2 is a left side view of the pressure adjusting device.

FIG. 3 is a right side view of the pressure adjusting device.

FIG. 4 is a cross-sectional view of the body having a height in which a branch portion is connected to the body in FIG. 1;

FIG. 5 is an overall schematic view of an underwater nozzle device for generating cavitation bubbles.

FIG. 6 is a view of the ultra-high pressure pump viewed from a manifold side.

FIG. 7 is a graph showing a relationship between an actual pressure value of the pressure regulator at a predetermined cooling water flow rate and a temperature of water (= cooled water after treatment) discharged from the pressure regulator cooling water channel. .

[Explanation of symbols]

 Reference Signs List 16 water (refrigerant, fluid) 18 booster pump 30 ultra high pressure pump (ultra high pressure pump) 32 suction port (suction part) 48 pressure regulator 62 cooling water channel for pressure regulator (cooling means) 63 water temperature sensor (temperature difference detecting means) 66 Discharge port (pressure-regulated part, discharge part) 78 Valve seat 80 Valve element 90 Operating screw (pressure regulation value setting means) 92 Flow control valve (cooling force control means)

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[Procedure amendment]

[Submission date] March 21, 1997

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Fig. 6

[Correction method] Change

[Correction contents]

[Fig. 6]

Claims (4)

[Claims] (A) a valve body (80) which seats on and separates from a valve seat (78) to adjust the pressure of a pressure-regulated point (66) to a set pressure regulation value; and (b) at least the valve A pressure regulating device, comprising: cooling means (62) for cooling an area including the body (80) and the valve seat (78). (C) a pressure adjustment value setting means (90) for adjusting the set pressure adjustment value; and (d) an increase in the set pressure adjustment value in conjunction with the pressure adjustment value setting means (90). The refrigerant (1) of the cooling means (62)
2. A pressure regulating device according to claim 1, further comprising a cooling force control means (92) for increasing the flow rate in (6). 3. The ultra-high pressure pump (3)
0), and the cooling means (62) is a fluid (16) from a booster pump (18) that sends the fluid (16) to a suction part (32) of the ultrahigh pressure pump (30). 3. The pressure regulating device according to claim 1, wherein the refrigerant is a refrigerant (16). 4. A temperature difference detecting means (63) for detecting a difference between a temperature of the fluid (16) after being used by the cooling means (62) and a temperature of a suction fluid of the ultrahigh pressure pump (30). 4. The method according to claim 3, further comprising: (f) a pressure regulation value fluctuation detecting means for detecting a fluctuation of the pressure regulating value based on an output change of the temperature difference detecting means (63). Pressure regulator.