JPH0755046A - Pressure reducing valve system - Google Patents

Abstract

PURPOSE:To restrain each of connection parts minimum and to improve a water supplying method by pressure by reducing pressure down to pressure on the scale of 1: a specified value of pressure on the secondary side regardless of a fluid flow rate and by controlling secondary pressure within a constant range. CONSTITUTION:A support spring 21 automatically controls pressure reducing pressure by an interaction with a pressure governing spring 29. Adjustment of the pressure reducing pressure is carried out by a screwing amount of a main body cover 32 to cover from an upper part of a body main body 18 and a pressure governing cover 30 positioned on an upper part of the pressure governing spring 29. A secondary outflow connection port 26 is communicated to a diaphragm 28 through a secondary outflow hole 25. In this pressure reducing system flowing out fluid to the secondary side by way of reducing fluid pressure, pressure of 1/100 of the secondary side pressure regardless of a fluid flow rate, and secondary pressure is controlled within a constant range. Consequently, as it becomes a hysteresis characteristic to minimize variation of the secondary pressure regardless of change of the flow rate in the constant range it is possible to supply stable secondary output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved pressure reducing mechanism for a pressure reducing valve provided in a liquid flow path and a system using the pressure reducing valve.

[0002]

2. Description of the Related Art FIG. 11 is a skeleton diagram of a moisture permeable film type natural evaporation humidifier provided with a conventional pressure reducing device. In the figure, 1 is a primary water supply pipe, 2 is a water supply valve, 3 is a connecting pipe A, 4 is an electromagnetic valve, 5 is a connecting pipe B, and 1 to 5 are primary water supply paths. Reference numeral 7 is a water supply tank, and solenoid valves connected in series are ON / OFF-controlled by detecting the liquid level of a float switch 6 provided in the water supply tank 7 so as to always maintain a constant water level. 8 is a secondary water supply pipe,
The moisture-permeable membrane type natural evaporation humidifier 9 and the water supply tank 7 are connected.

Next, the operation of the conventional example will be described. Figure 1
2 and 13 are a side view and a cross-sectional view of an air conditioner incorporating a conventional device. The moisture permeable membrane type natural evaporative humidifier 9 is configured to be tied to the secondary air passage side of the heat exchanger 14, and is composed of a fan casing 17 and a sirocco fan 13 when the heat exchanger 14 is heated by a heat medium. When the wind is blown by the blower to warm the surface of the moisture permeable film type natural evaporation humidifier 9, it spontaneously evaporates and performs a humidifying action. When the liquid level inside the water supply tank 7 is lowered by continuing the above operation, the float switch 6 is turned on and the solenoid valve 4 is turned on to supply water.

[0004]

In the conventional device as described above, as shown in FIG. 12, the water supply pressure to the moisture permeable membrane type natural evaporation humidifier 9 is kept at 1/100 kgf / cm ² or less, and Since it is necessary to prevent water leakage due to breakage of the wet film type natural evaporation humidifier 9, the primary water supply pressure is once opened in the water supply tank 7, and the natural difference between the water supply tank 7 and the moisture permeable film type natural evaporation humidifier 9 (200 The pressure is about 300 mm and the pressure is converted to about 0.03 kgf / cm ² ). From the above, since it is necessary for the water supply tank 7 to secure a natural head, the product height of the indoor unit 10 is added to the water supply tank 7.
Since the height is required, a method contradictory to the tendency of lowering the height of the ceiling ceiling 11 from the ceiling surface 11 is a problem in terms of installation at present.

Further, in the conventional apparatus, since the portion connecting the water supply tank 7 and the primary / secondary is externally mounted,
There was a problem of water leakage due to defective connections.

Further, there is a problem that it is difficult to adjust the height of the water supply tank 7 because the secondary pressure is adjusted to a minute pressure of 1/100.

The present invention has been made in order to solve the above problems, and minimizes the number of joints,
The purpose is to improve the water supply system by pressure and eliminate the conventional drawbacks.

[0008]

A pressure reducing valve device according to claim 1 is a pressure reducing mechanism which is provided on a liquid flow path and reduces the liquid pressure to flow to the secondary side, regardless of the liquid flow rate. The pressure can be reduced to 1/100 of the pressure and the secondary pressure can be controlled within a certain range.

The pressure reducing valve device according to a second aspect is the pressure reducing valve device according to the first aspect, wherein the orifice channel of the pressure reducing valve is constituted by the main shaft of the pressure reducing valve and the outer wall of the orifice channel and has a double cylindrical shape. The area is in the range of 0.3 to 3.5 mm ² , and the valve body contact tip that is one end of the orifice flow path is provided with R of 0.5 or less on the outer circumference.

A pressure reducing valve device according to a third aspect of the present invention is the pressure reducing valve device according to the first aspect, wherein the support spring portion of the pressure reducing valve is provided with a primary pressure liquid inflow hole at a portion orthogonal to the support spring.

A pressure reducing valve device according to a fourth aspect of the present invention is the pressure reducing valve device according to the first aspect, wherein an opening / closing valve for opening and closing a liquid flow path flowing into the pressure reducing valve is provided on the primary side of the pressure reducing valve.

A pressure reducing valve device according to a fifth aspect is the pressure reducing valve device according to the fourth aspect, wherein in the primary liquid inflow hole to the electromagnetic on-off valve, the primary liquid inflow hole is provided in an outer peripheral portion orthogonal to the valve body portion of the on-off valve. Is provided.

A pressure reducing valve device according to a sixth aspect is the pressure reducing valve device according to the fourth aspect, in which an electromagnetic on-off valve, a pressure reducing valve, a drain valve for preventing a rise in liquid pressure, a primary inflow connection port, and a secondary output connection port are integrated. It is molded.

A pressure reducing valve device according to a seventh aspect is the pressure reducing valve device according to the fourth aspect, in which a damper rubber is provided on a surface of a coil post portion which is contacted during electromagnetic attraction in a plunger portion of the electromagnetic opening / closing valve, and the coil is used as a DC power source. It was done.

[0015]

In the pressure reducing valve device according to the first aspect of the present invention, the hysteresis characteristic is such that the amount of change in the secondary pressure is minimized regardless of the change in the flow rate within a certain range, so that a stable secondary output can be supplied.

In the pressure reducing valve device according to the second aspect, the diaphragm valve in the pressure reducing valve has a hysteresis characteristic in which the amount of change in the secondary pressure is minimized regardless of the hydraulic pressure when opening and closing the primary pressure. The secondary output can be supplied.

In the pressure reducing valve device according to the third aspect of the present invention, the diaphragm valve in the pressure reducing valve is always operating in a slow leak state, so that the backlash generated by the primary hydraulic force when the primary side is opened and closed is alleviated. Prevents defective sealing of the on-off valve.

Since the pressure reducing valve device according to the fourth aspect has a hysteresis characteristic in which the amount of change in the secondary pressure is minimized regardless of the change in the flow rate within a certain range, a stable secondary output can be supplied.

In the pressure reducing valve device of the fifth aspect, the diaphragm valve in the pressure reducing valve is always operated in a slow leak state, so that the backlash generated by the temporary hydraulic force when the primary side is opened and closed is reduced. Prevents defective sealing of the on-off valve.

In the pressure reducing valve device according to the sixth aspect of the present invention, the rise of the secondary pressure can be suppressed to a specified value or less by the drain valve, the pressure breakdown of the moisture permeable membrane type natural evaporation humidifier is prevented, and the water leakage of the indoor unit is prevented. Defects can be prevented.

In the pressure-reducing valve device according to the seventh aspect, the plunger of the on-off valve hits the post portion when electromagnetically attracted to generate an impact noise. However, a direct current power source is used for the electromagnetic coil to suppress the electromagnetic force, and the post portion is suppressed. The buffer damper provided eliminates the generation of opening and closing noise.

[0022]

【Example】

Example 1. 1 is a sectional view of a pressure reducing valve according to a first embodiment of the present invention. In the figure, 18 is a body main body, 19 is a primary inflow connection port, 20 is a primary inflow hole, and 23 is a pressure-reducing valve valve body support, which holds an elastic valve body A on the upper portion. Reference numeral 33 is a main shaft that clamps the diaphragm 28 from above and below in a sandwich shape with a seat 37 and a nut 31. Reference numeral 21 is a support spring, which is configured to automatically control the depressurization pressure by interaction with the pressure adjusting spring 29. The decompression pressure can be adjusted by adjusting the screw amount of the main body cover 32 covering the body main body 18 from above and the pressure adjusting cover 30 located above the pressure adjusting spring 29. Reference numeral 34 is a valve body contact protrusion. Further, 26 is a secondary outflow connection port, which is the secondary outflow hole 2
5 communicates with the diaphragm 28. FIG. 2 is an enlarged view of the diaphragm portion of the pressure reducing valve. Valve body contact protrusion 3
The tip minute curved surface portion 35 of 4 has a curved surface (for example, R0.2) all around. Reference numeral 36 denotes a double cylindrical communication hole, which is composed of an outer wall composed of the main shaft 33 and the body body 18 (for example, the first embodiment).
The cross-sectional area at is 1.7 mm ² ).

Example 2. FIG. 3 is a sectional view of a second embodiment in which the pressure reducing valve is provided with an opening / closing valve. A bobbin 40 has an electromagnetic coil 42 wound around its outer circumference. Reference numeral 38 denotes a post, which supports a stopper of a spring 41 and a damper rubber 39 for absorbing a shock when the DC plunger is attracted. Four
3 is an O-ring for a watertight seal. Reference numeral 45 is a valve element held at the tip of the DC plunger 44. 48
Is a tip projection of the primary inflow hole 20. Reference numeral 47 is a primary connection port for allowing the primary liquid to flow into the on-off valve, and 46 is configured to connect the primary connection port 47 and the tip projection 48.

Example 3. FIG. 4 is a skeleton diagram in which a pressure reducing valve is provided on the primary side of the moisture permeable membrane type natural evaporation humidifier according to the third embodiment. The description of the same or corresponding parts as in the conventional example will be omitted.
Reference numeral 50 denotes a pressure reducing valve main body, which is arranged between the moisture permeable membrane type natural evaporation humidifier 9 and the connecting pipe A3 serving as the primary side water supply path.

Example 4. FIG. 5 is a cross-sectional view in which a drain valve is provided between the secondary outlet connection ports 26 of the pressure reducing valve. The 25 secondary outflow holes are divided into two, and one is connected to the secondary outflow connection port 26 and the second outflow connection port 67. The other half is
When the liquid pressure flows from the drainage channel 59 into the drainage diaphragm 57 and the liquid pressure becomes higher than the set pressure of the adjusting spring 56, the drainage diaphragm 57 is pushed up and the drainage hole 60 is connected to the drainage port 16. Reference numeral 58 is a drainage protrusion that comes into contact with the drainage diaphragm 57. 55
Is a drainage pressure regulating cover arranged above the adjusting spring 56.

Example 5. FIG. 6 is a skeleton diagram showing the positional relationship between the pressure reducing device 62 in which the on-off valve, the pressure reducing valve, and the drain valve are integrally formed, and the moisture permeable membrane type natural evaporation humidifier 9. It is connected to the moisture permeable membrane type natural evaporative humidifier 9 from the primary side water supply valve 2 through the opening / closing valve 49, the pressure reducing valve 50 and the secondary communication pipe 53. The secondary communication pipe 53 is branched to reach the drain port 16 via the drain valve 51.

Example 6. FIG. 7 is a connection skeleton diagram in which a plurality of moisture permeable membrane type natural evaporation humidifiers 9 are connected from the decompression device 62 which is Embodiment 6 of the present invention. In this embodiment, a skeleton diagram is shown in which the moisture permeable membrane type natural evaporation humidifier 9 is connected to the secondary outflow connection port 26 and the second outflow connection port 67, respectively, but if it is within the control range of the secondary discharge flow rate. Two
More than one connection is possible.

Example 7. 9 and 10 are a mounting view of an indoor unit incorporating the decompression device 62 of Embodiment 7 of the present invention and a skeleton diagram of a building in which the indoor unit is installed. 12 is an indoor unit 10
The pressure reducing device 62 is a drain pan provided inside.
And the moisture permeable membrane type natural evaporation humidifier 9 is the drain pan 1 described above.
2 is installed above the indoor unit 10 and has a configuration that does not change the external dimensions of the indoor unit 10. Reference numeral 63 is a cistern tank, which serves as a path for supplying each indoor unit from the city water pipe 64 through the ball tap 65 to the primary water supply pipe 1 through the branch pipe 67. Taking one of them as an example, it is connected to the indoor unit 10 via the water supply valve 2 inside the ceiling portion 66.

FIG. 8 is a flow rate characteristic line in the case where the double cylindrical flow passage cross-sectional area constituted by the main shaft of the pressure reducing valve of the present invention and the outer wall of the orifice flow passage and the small curved surface R of the valve body contact portion are changed. It is a figure. From this flow rate characteristic, when the cross-sectional area of the double-cylindrical flow path composed of the main shaft and the outer wall of the orifice flow path is large, the change of the maximum value of the flow rate due to the change of the primary pressure is large, and the secondary pressure is largely changed. There is a tendency. Further, when R of the minute curved surface of the valve body contact portion becomes large, the secondary pressure tends to be unstable in the low flow rate region, and the variation in the secondary pressure due to the variation in the primary pressure tends to be large. Combining the above tendencies, the cross-sectional area of the double cylindrical flow path composed of the main shaft of the pressure reducing valve and the outer wall of the orifice flow path is set to 1.7 mm ^2, and the small curved surface R of the valve body contact portion is set to about 0.2. By combining them, a stable flow characteristic can be secured in the range of the secondary flow rate of 0 to 200 cc / min, and the secondary pressure has an accuracy of about ± 0.015 kgf / cm ^{2 with} respect to the reference value. It is a pressure reducing valve that can be secured.

[0030]

The pressure reducing valve device according to the first aspect of the present invention is a pressure reducing mechanism which is provided on a liquid flow path and reduces the liquid pressure to flow to the secondary side, regardless of the liquid flow rate.
Since the pressure is reduced to 100 and the secondary pressure can be controlled within a certain range, the secondary pressure has a minimum change amount regardless of the change in the flow rate within the certain range. In addition, a stable secondary output can be supplied.

According to a second aspect of the present invention, there is provided a pressure reducing valve device according to the first aspect, wherein the orifice channel of the pressure reducing valve is constituted by a main shaft of the pressure reducing valve and an outer wall of the orifice channel and has a double cylindrical shape. Since the area is in the range of 0.3 to 3.5 mm ² and the valve body contact tip that is one end of the orifice flow path is provided with R of 0.5 or less on the outer periphery, the diaphragm in the pressure reducing valve Since the valve has a hysteresis characteristic in which the amount of change in the secondary pressure is minimized regardless of the hydraulic pressure when opening and closing the primary pressure, a stable secondary output can be supplied.

The pressure reducing valve device according to a third aspect of the present invention is the pressure reducing valve device according to the first aspect, wherein in the support spring portion of the pressure reducing valve, the liquid inlet hole for the primary pressure is provided in a portion orthogonal to the support spring. Since the diaphragm valve in the pressure reducing valve is always operating in a slow leak state, it reduces the backlash that occurs due to temporary hydraulic force when the primary side is opened and closed, and prevents defective sealing of the on-off valve and other parts. .

Since the pressure reducing valve device according to a fourth aspect is the pressure reducing valve device according to the first aspect, an opening / closing valve for opening and closing the liquid flow path flowing into the pressure reducing valve is provided on the primary side of the pressure reducing valve.
Since the hysteresis characteristic is such that the amount of change in the secondary pressure is minimized regardless of the change in the flow rate within a certain range, a stable secondary output can be supplied.

A pressure reducing valve device according to a fifth aspect is the pressure reducing valve device according to the fourth aspect, wherein in the primary liquid inflow hole to the electromagnetic on-off valve, the primary liquid inflow hole is provided in an outer peripheral portion orthogonal to the valve body portion of the on-off valve. Since the diaphragm valve in the pressure reducing valve always operates in a slow leak state, the backlash generated by temporary hydraulic force when the primary side is opened and closed is mitigated, and the opening / closing valve section Prevents defective sealing.

A pressure reducing valve device according to a sixth aspect is the pressure reducing valve device according to the fourth aspect, wherein an electromagnetic opening / closing valve, a pressure reducing valve, a drain valve for preventing a rise in liquid pressure, a primary inflow connection port, and a secondary output connection port are integrated. With the molded structure, the drain valve can suppress the rise in the secondary pressure to be equal to or less than the specified value, prevent pressure breakdown of the moisture permeable membrane type natural evaporation humidifier, and prevent water leakage failure of the indoor unit.

A pressure reducing valve device according to a seventh aspect is the pressure reducing valve device according to the fourth aspect, in which a damper rubber is provided on a surface of a coil post portion which is contacted during electromagnetic attraction in a plunger portion of the electromagnetic opening / closing valve, and the coil is used as a DC power source. With this configuration, the plunger of the on-off valve hits the post when electromagnetically attracted and produces an impact noise.However, the electromagnetic force is suppressed by using the DC power supply for the electromagnetic coil, and the buffer damper provided on the post , It is possible to eliminate the generation of opening and closing noise.

[Brief description of drawings]

FIG. 1 is a sectional view of a pressure reducing valve according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of the diaphragm portion of the pressure reducing valve according to the first embodiment of the present invention.

FIG. 3 is a sectional view of a pressure reducing valve according to a second embodiment of the present invention provided with an opening / closing valve.

FIG. 4 is a skeleton diagram in which a pressure reducing valve is provided on the primary side of a moisture permeable membrane type natural evaporation humidifier according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view in which a drain valve is provided between the secondary outflow connection ports of the pressure reducing valve according to the fourth embodiment of the present invention.

FIG. 6 is a skeleton diagram showing a positional relationship between a pressure reducing device integrally formed with an opening / closing valve, a pressure reducing valve and a drain valve according to a fifth embodiment of the present invention and a moisture permeable membrane type natural evaporation humidifier.

FIG. 7 is a connection skeleton diagram in which a plurality of moisture permeable membrane type natural evaporation humidifiers are connected to a decompression device according to Embodiment 6 of the present invention.

FIG. 8 is a cross-sectional view of a double-cylindrical flow path constituted by the main shaft of the pressure reducing valve of the present invention and the outer wall of the orifice flow path.

FIG. 9 is a mounting view of an indoor unit incorporating a pressure reducing device according to a seventh embodiment of the present invention.

FIG. 10 is a skeleton diagram of a building in which an indoor unit incorporating a decompression device according to Embodiment 7 of the present invention is installed.

FIG. 11 is a skeleton diagram of a moisture permeable film type natural evaporation humidifier provided with a conventional decompression device.

FIG. 12 is a side view of an air conditioner provided with a conventional pressure reducing device.

13 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 18 Body Main Body 34 Valve Contact Protrusion 35 35 Tip Small Curved Surface 36 Double Cylindrical Communication Hole 39 Damper Rubber 50 Pressure Reducing Valve Main Body 51 Drain Valve 62 Pressure Reduction Device

Claims (7)

[Claims] 1. A decompression mechanism provided on a liquid flow path for decompressing a liquid pressure to flow to a secondary side, the pressure being reduced to 1/100 of a secondary side pressure regardless of the liquid flow rate, and A pressure reducing valve device that can control the secondary pressure within a certain range. 2. The orifice flow path of the pressure reducing valve, comprising a main shaft of the pressure reducing valve and the outer wall of the orifice flow path, and having a double cylindrical cross-sectional area of 0.3 to 3.5 mm ² . 2. The pressure reducing valve device according to claim 1, wherein the valve body contacting tip that is one end of the orifice channel is provided with R of 0.5 or less on the outer circumference. 3. The pressure reducing valve device according to claim 1, wherein in the support spring portion of the pressure reducing valve, a liquid inlet hole for primary pressure is provided at a portion orthogonal to the support spring. 4. The pressure reducing valve device according to claim 1, wherein an opening / closing valve for opening / closing a liquid flow path flowing into the pressure reducing valve is provided on the primary side of the pressure reducing valve. 5. The pressure reducing valve device according to claim 4, wherein, in the primary liquid inflow hole to the electromagnetic on-off valve, the primary liquid inflow hole is provided in an outer peripheral portion orthogonal to the valve body portion of the on-off valve. 6. The pressure reducing valve device according to claim 4, wherein the electromagnetic opening / closing valve, the pressure reducing valve, the drain valve for preventing the rise of the liquid pressure, the primary inflow connection port, and the secondary output connection port are integrally molded. 7. The plunger portion of the solenoid opening / closing valve,
5. The pressure reducing valve device according to claim 4, wherein a damper rubber is provided on the surface of the coil post portion that is contacted during electromagnetic attraction, and the coil serves as a DC power source.