JPH044254Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is equipped with first and second pressure displacement devices consisting of a diaphragm, a piston, etc., and always reduces the pressure of the fluid acting on the high pressure chamber at a predetermined ratio, and also reduces the pressure on the low pressure chamber side. The present invention relates to a pressure control device that can completely prevent backflow toward a high-pressure chamber even when pressure rises.

Conventionally, a so-called pressure reducing valve is used when a pressure lower than that of the main circuit is required. However, this pressure reducing valve always discharges fluid at a predetermined set pressure to the pressure reducing outlet even when the fluid pressure on the high pressure side fluctuates, and is designed to discharge a reduced pressure proportional to the fluid pressure on the high pressure side. has not been formed.

The present invention is based on connecting the first and second pressure displacement devices together and providing a through hole in the connecting part leading to the high and low pressure chambers, so that the pressure can always be reduced at a predetermined ratio and it has a non-relief function. With the aim of providing a pressure control device that can also be used, one embodiment thereof will be described below with reference to the drawings.

In Figs. 1 to 4, a pressure control device 1 of the present invention is shown.
, a high pressure chamber 4 and a low pressure chamber 5 are formed on the outer surfaces of the first pressure displacement device 2 and the second pressure displacement device 3 that are operably connected together, and a connecting portion 6 thereof is formed.
The first and second pressure displacement devices 2 and 3 are provided with a through hole 7 and a valve portion 8 that can block the through hole 7 by moving the connecting portion 6 toward the high pressure side. In the example, diaphragms 10 and 11 made of, for example, elastic sheets that can be elastically deformed under pressure are used. The diaphragm 10 is located between the front case 12 and the middle case 13, and the diaphragm 11 is located between the middle case 13 and the rear case 14, and the front case 12,
The middle case 13 and the rear case 14 are screwed together using bolts so that they are airtightly sandwiched and fixed around their respective peripheries, and the diaphragms 10 and 1
1, the inner peripheral side of the valve cylinder 1 has the through hole 7 formed therein.
The diaphragms 10 and 11 are movably connected together on the inner circumferential side by pressing the flange 17 at the center outer circumference of the diaphragms 10 and 11 with a nut 20 interposed in the collar 19 and screwed onto the valve cylinder 16. be done. Note that the valve cylinder 16, collar 19, and nut 20 form the connecting portion 6, while one end of the through hole 7 is connected to the front case 12.
The other end communicates with a high pressure chamber 4 formed on the inner surface of the rear case 14, that is, the outer surface of the first pressure displacement device 2, and the other end communicates with a low pressure chamber 4 formed on the inner surface of the rear case 14, that is, the outer surface of the second pressure displacement device 3. The chambers 5 and 5 are electrically connected to each other. The high pressure chamber 4 and the low pressure chamber 5 are formed of circular holes, and the diameter of the low pressure chamber 5 is approximately √2 times larger than that of the high pressure chamber 4. Further, the middle case 13 has a tapered hole portion whose front end is equal to the diameter of the high pressure chamber 4 and whose side 5 is tapered to the same diameter as the low pressure chamber 5, and has an appropriate air vent hole 21. It is transparent.
Therefore, the first, movable parts of the diaphragms 10 and 11 contact the high pressure chamber 4 and the low pressure chamber 5, respectively.
The second pressure displacement tools 2 and 3 have respective areas A1 and A
The area ratio (A1/A2) of 2 is set to approximately 1/2, for example.

The valve cylinder 16 has a chamfered outer periphery of the end on the high pressure chamber 4 side, and the chamfered part 23 is attached to a protrusion 24 provided around the valve seat 9, which is attached to the center of the front case 12 so as to face the valve cylinder 16. The first and second pressure displacement tools 2 and 3 can be fitted in their free states. In this way, the valve portion 8 is formed by the valve seat 9 and the chamfered portion 23 of the valve cylinder 16. Furthermore, the low pressure chamber 5
A piston chamber 26 is provided which extends to the other side of the low pressure chamber 5 and has a smaller diameter than the low pressure chamber 5, and a piston 27 that can move forward and backward toward the valve cylinder 16 is hermetically sealed. At the same time, an adjustment screw 25 is screwed into the rear case 14 so that one end thereof faces the piston chamber 26 and is substantially concentric with the valve cylinder 16 . The adjusting screw 25 can position the piston 27 by bringing one end into contact with the piston 27 and screwing it forward and backward. Furthermore, a spring 28 is interposed between the piston 27 and a collar 19 which is fixed to the valve cylinder 16 and positions the second pressure displacement device 3, and which biases the valve cylinder 16 toward the valve seat 9 by a spring force F. do.

Therefore, the piston 27 and the adjusting screw 2 are placed in the low pressure chamber 5.
5 and a spring 29 are provided. Note that 30 and 30 are inlet ports that communicate with each other via the high pressure chamber 4, so that the first pressure displacement device 2 closes one side of the high pressure chamber 4 and can be displaced by pressure changes. . Further, the outlet port 31 is communicated with the low pressure chamber 5 through a conduit hole, so that the second pressure displacement device 3 is connected to the low pressure chamber 5 which is larger in size than the side surface of the high pressure chamber 4.
The first and second pressure displacement devices 2 and 3 are connected by the connecting portion 6, and can be displaced by pressure changes.

However, the pressure control device 1 of the present invention has a high pressure fluid flowing in from the inlet port 30 (for example, 1
Kg/cm ² ), the first pressure displacement device 2 is pressed toward the low pressure chamber 5 side, and the connecting portion 6 moves in that direction, thereby causing the valve cylinder 16 and the valve seat 9 to move.
The space between them is opened, and the high pressure fluid flows into the low pressure chamber 5 side through the communication hole 7. The pressure in the low pressure chamber 5 is first,
Area ratio of second pressure displacement tools 2 and 3 (A1/A2)
When the pressure ⁱⁿ accordance with
The forces acting on the are balanced, and the second pressure displacement device 3 is eventually pressed toward the high pressure chamber 4.
The valve cylinder 16 and the valve seat 9 are shielded to prevent inflow of high pressure fluid. As a result, the pressure on the low pressure chamber 5 side is maintained at a pressure corresponding to the area ratio (A1/A2) of the first and second pressure displacement devices 2 and 3. Note that even when the back pressure on the low pressure chamber 5 side rises above the set pressure (for example, 0.5 Kg/cm ² mentioned above) due to load, the valve cylinder 16 and valve seat 9 are closed, preventing backflow to the high pressure side. prevent. Also, the adjustment screw 2
5 and presses the spring 29 via the piston 27, the valve cylinder 16 can be pressed against the valve seat 9 by the spring force F, and as a result, the spring force F and the second pressure displacement device 3 The pressure in the low pressure chamber 5 can be relatively reduced by the corresponding pressure (F/A), which is the quotient value with the area A2.For example, as shown in FIG. Compared to the pressure, the pressure on the low pressure chamber 5 side is about 1/2 and is proportional as shown by the straight line a. However, when the equivalent pressure based on the spring force F is, for example, 0.1 Kg/ ^cm2 , Straight line b, and when it is 0.25Kg/cm ² , straight line c, 0.5
When the pressure is Kg/cm ² , the pressure ratio can be varied so as to form a straight line d. In FIG. 4, the horizontal axis represents the pressure on the high pressure chamber 4 side, and the vertical axis represents the pressure on the low pressure chamber 5 side.

In this way, the pressure control device of the present invention can proportionally reduce and adjust the pressure on the low pressure chamber 5 side according to the area ratio (A1/A2) of the first and second pressure displacement devices 2 and 3. By using the spring 29, the relationship between the pressure ratios can be finely adjusted.

In addition, in the pressure control device 1 of the present invention, as illustrated in FIG.
A piston can also be used as the valve seat 9.
In addition, check valves 32 are provided in the high pressure chamber 4 and the low pressure chamber 5 to allow free flow to the high pressure chamber 4, if necessary, to depressurize the high pressure chamber 4 side during periods of rest, etc. In some cases, the low-pressure chamber 5 side can also be depressurized, and it is also possible to connect the first and second pressure displacement devices 2 and 3 by integrally forming them.

6 and 7 show an example of how the pressure control device 1 of the present invention is applied to a coating liquid mixing device 40. The coating liquid mixing device 40 is used for coatings such as polyester resin paints and polyurethane resin paints that are cured by mixing a main agent and an auxiliary agent, adhesives, and other multi-component mixing type coating liquids, as well as for color matching. When applying different colored paints, etc. to the surface, by making it possible to mix them in the correct ratio each time depending on the amount used, it improves the efficiency and quality of the painting work and reduces the amount of residual mixed liquid and its It is possible to eliminate waste such as the disposal of paint due to restrictions due to pot life, and a pressurizing cylinder 43 is attached to the base plate 42 of the trolley 41, and multiple, in this example three, paints are installed. Pumps 44, 45, 46 and agitator 4
7, and the pressure control device 1 of the present invention includes paint regulators 48, 48, 48 attached to the discharge ports of the paint pumps 44, 45, 46, and control air to the regulators 48, 48, 48. The inlet ports 30 and 30 are connected to the pressure regulator 49, respectively, and the outlet port 31 communicates with the air intake port 50 of the agitator 47 via a hose 51.

The pressurizing cylinder 43 is a so-called air-driven cylinder of a well-known construction that automatically reciprocates the rod 53 by introducing high-pressure air, and is bolted to the base plate 42 with the rod 53 downward. Further, the piston rods of the paint pumps 44, 45, 46 are removably screwed to a connecting plate 54 at the end of the rod 53. Paint pump 4
Reference numerals 4, 45, and 46 designate so-called double-action type pumps that suck the coating material from the strainer 55 at the lower end and discharge the coating material from the discharge port each time the piston rod moves up and down. It is bolted to the intermediate plate 57 provided.
Also, the diameter of the paint pump 45 is the same as that of the paint pumps 44 and 46.
For example, the cross-sectional area is set to be 1/2 of that of the cross-sectional area. The paint pressure regulator 48 is connected to the device 1.
The paint pressure can be regulated to, for example, 1 kg/cm ² according to the high-pressure side air pressure introduced from the pressure regulator 49 by communicating the inlet ports 30 and 30 of the inlet ports 30 and 30, and the pressure controls 59 and 60 are attached to each of the two outlets. It will be done. Stirrer 47
is provided with the air intake port 50 and three inlets 62, 62, 62 communicating with the inside of the airtight container 61 made of a transparent cylinder on the upper plate thereof, and a discharge port 63 is formed on the lower plate, And a mixing tool 65 is housed inside. Further, the airtight container 61 is surrounded by a protective cover 67 except for its front portion. A rotary machine 69, which is, for example, an air motor, is mounted upside down on the upper plate via a bracket, and the mixer 65, which has a rotary blade at its lower end, is held on its output shaft 70 directly above the discharge port 63. Further, the upper plate is provided with a safety valve 71 and a relief valve 72 that communicate with the inside of the airtight container 61, respectively, and the agitator 47 is fixed to the front edge of the cart 41 by an L-shaped fitting 75 on a rotating machine 69. Note that the discharge port 63
is connected to a coating gun (not shown) via a pot 77, and the injection ports 62, 62, 62 are connected to the coating pumps 44, 45, 46 via pots 79, 79, 79, as shown by a dashed line. The paint pressure regulator 48 is connected in parallel to one of the valves 59 attached to the paint pressure regulator 48. A cock 80 capable of supplying compressed air to the rotating machine 43, an inlet of a pressure regulator 81 attached to the air introduction port of the pressurizing cylinder 43, and an inlet of the pressure regulator 49 at the upper end of the device 1 are shown on a reduced scale. Connect to compressor A.

To explain the operation of the device 40 of this example, the strainers 55 of the paint pumps 44 and 46 are inserted into the paint tank B storing the main paint, and the strainer 55 of the paint pump 45 is inserted into the paint tank B containing the auxiliary paint. At the same time, the pressure regulator 81 is used to adjust the air pressure suitable for the operation of the pressurizing cylinder 43, and the pressure regulator 49 is used to adjust the paint pressure in the paint pressure regulator 48 to, for example, 1 kg/cm ² as described above. As a result, the pressure control device 1 of the present invention pressurizes the airtight container 61 of the stirrer 47 from its outlet port 31 with air pressure that is correctly and automatically reduced to, for example, 0.5 kg/cm ² , as described in detail above. In addition, by operating the pressurizing cylinder 43, the main agent and auxiliary agent from the paint tanks B and C are transferred from the strainer 55 to the paint pumps 44, 46 and the paint pump 45.
The pump is pumped at the correct capacity ratio of 1, and passes through the paint pressure regulator 48, the pots 59 and 79, and the inlet 62.
and inject into an airtight container 61. The main agent and the auxiliary agent are stirred by the mixing tool 65 at the same time as they are injected, and at that time, an internal pressure of 0.5 Kg/cm ² is acting on the airtight container 61, so the main agent and the auxiliary agent are fed at a pressure of 1 Kg/cm ² .
Since the device 1 of the present invention is formed in a non-relief type, when the auxiliary agent is injected into the airtight container 42 to about 1/2, the internal pressure increases and the setting of the paint pressure regulator 48 is caused. Almost equal to the pressure 1
Kg/cm ² and reaches equilibrium and automatically stops feeding.

The mixed coating liquid passes through the pot 77 and is sprayed by a coating gun, and as the spraying progresses, the liquid level in the airtight container 61 falls, and therefore the internal pressure inside the airtight container 61 decreases. Kotoku 5
9 and 79, the coating liquid is automatically supplied to an initial height that maintains the predetermined pressure. In addition, the pressurizing cylinder 43 is used as an agitator to push down the connecting plate 54 as the main agent, auxiliary agent, and other coating agents are fed from the coating pumps 44, 45, and 46, and to stop its operation when the spraying operation is interrupted. The coating liquid is sent by moving up and down to the extent that the internal pressure of 47 can be maintained at the set pressure.
In this way, in the device 40 of this example, the coating liquid can be automatically supplied at the correct ratio each time the mixed liquid is used by the coating gun, and is constantly stirred by the stirrer 47, making it possible to perform continuous coating work with uniform quality. shall be. Also, by applying internal pressure inside the airtight container 61,
The coating liquid is prevented from scattering within the airtight container 61 during operation, and the coating liquid is prevented from adhering to the seal portion, etc., thereby reducing maintenance effort. Further, since a mixing tool 65 is provided directly above the discharge port 63 at the lower end, the mixed coating liquid is reliably sent to the coating gun. When the coating operation is interrupted, by closing the pot 79, the entire amount of the coating liquid in the airtight container 61, which is kept pressurized, can be sent to the coating gun, thus preventing the coating liquid from stagnation inside. Facilitates the following uses:

As described above, the pressure control device 1 of the present invention can be used, for example, in the coating liquid mixing device 40 to
By regulating the pressure of the paint regulator 48 of the paint pumps 44, 45, and 46, the pressure of the agitator 47 can be set to, for example, 1/2 of the pressure at the same time, and when the pressure is regulated by providing a separate pressure reducing valve or the like in the agitator 47. Compared to the above, the pressure ratio can be adjusted correctly and with one operation, which simplifies the pressure control work and improves the ease of handling the device.

In addition to the coating liquid mixing device 40, the pressure control device 1 of the present invention can be used to adjust the pressure of various devices such as cylinders, pumps, hydraulic and pneumatic motors, which preferably control pressure proportionally. .

As mentioned above, the pressure control device of the present invention is equipped with the first and second pressure displacement devices, and is capable of reducing the pressure acting on the inlet port at the outlet port at a correct and constant ratio at all times, depending on the fluid pressure on the high pressure side. The pressure at the outlet port can be adjusted to a proportional pressure, and it can also be easily configured into a so-called non-relief type that prevents backflow to the inlet port, making it suitable for proportional control of various hydraulic and pneumatic equipment. can. It also makes it possible to maintain the pressure acting on the load, etc. on the low pressure side, and has a wide range of applications. Further, by adjusting the spring force by operating the adjustment screw, the pressure ratio between the high pressure chamber and the low pressure chamber can be finely adjusted. In addition, in the device of the present invention, various devices such as bellows can be used as the first and second pressure displacement devices, as long as they are displaced by pressure, in addition to pistons and diaphragms, and the diameter ratio of the devices can be selected appropriately. This enables pressure reduction control at various ratios. Furthermore, the device of the present invention can be configured to perform various functions by appropriately providing a check valve, a relief device, etc.

[Brief explanation of the drawing]

Figure 1 is a front view showing one embodiment of the present invention;
The figure is a sectional view, FIG. 3 is an exploded perspective view, FIG. 4 is a line diagram showing its function, FIG. 5 is a sectional view showing another embodiment, and FIG. 6 is a perspective view showing an example of its use. , FIG. 7 is a cross-sectional view illustrating an agitator used in the apparatus shown in FIG. 6. 2...First pressure displacement device, 3...Second pressure displacement device, 4...High pressure chamber, 5...Low pressure chamber, 6...Connection part, 7...Conducting hole, 8...Valve part, 9... Valve seat, 1
6... Valve barrel, 25... Adjustment screw, 26... Piston chamber, 27... Piston, 29... Spring, 30...
...Inlet port, 31...Outlet port.

Claims (1)

[Scope of utility model registration request] a first pressure displacement device that closes one side of the high pressure chamber through which the inlet port communicates and is displaced by a pressure change;
A second pressure displacement device is disposed facing the second pressure displacement device which is connected to the outlet port and which closes one side of the low pressure chamber which is larger in size than the one side of the high pressure chamber and is displaced by a pressure change. 1. The second pressure displacement device is connected to the high pressure chamber and the low pressure chamber using a valve cylinder having a conduction hole that communicates with the low pressure chamber, and when the valve cylinder is moved toward the high pressure chamber side, A valve seat for closing the communication hole is provided, and a piston is provided in the low pressure chamber, the piston being airtightly fitted into a piston chamber extending to the other side of the low pressure chamber and capable of moving forward and backward toward the valve cylinder. A pressure control device comprising: an adjustment screw that positions the piston by screwing it forward and backward toward a valve barrel; and a spring that is interposed between the piston and the valve barrel and biases the valve barrel toward a valve seat.