JPWO2019188883A1 - Relief valve - Google Patents

Abstract

Provided is a relief valve that can easily adjust the set pressure and can monitor the fluctuation of the set pressure after setting. A body 2 provided with a fluid inflow passage 2a, an annular valve seat 3 provided in the body 2, and a valve body 4 housed in the body 2 and urged to the valve seat by an urging member 7 are provided. The valve body 4 is a relief valve 1 capable of shutting off and opening the fluid inflow passage 2a by being moved by the fluid pressure in the fluid inflow passage 2a, and the urging force of the urging member 7 can be adjusted. The relief valve 1 is provided with a sensor 22 for detecting an urging force on at least one end side of the urging member 7.

Description

The present invention relates to a relief valve used to reduce the pressure of a fluid to a predetermined value or less.

In a device using a fluid, for the purpose of safety, etc., when the fluid pressure becomes a pressure above a predetermined value, it may be required to be below a predetermined value, and a means for reducing the fluid pressure to a predetermined value or less. A relief valve is provided in the device as one of the above.

The relief valve includes a body provided with a recess and a fluid inflow passage communicating with the recess, an annular valve seat provided in the body, and a valve housed in the body and urged to the valve seat by an urging member. It is known that the valve body is provided with a body and can block and open the fluid inflow passage by being moved by the fluid pressure in the fluid inflow passage (Patent Document 1).

Jikkai Sho 63-154874

According to the above relief valve, when the fluid pressure exceeds a predetermined value (the urging force of the urging member), the valve body moves and the fluid inflow passage is opened, so that the fluid pressure automatically falls below the predetermined value. The safety of the device provided with the relief valve is ensured.

As the urging member, for example, a compression coil spring or the like is used. When a compression coil spring is used as the urging member, it is possible by changing the degree of compression of the compression coil spring in order to adjust the set pressure of the relief valve. In order to set the degree of compression of this compression coil spring, fluids such as gases of various pressures are actually flowed through the relief valve, and if the relief valve operates before the set pressure is reached, the degree of compression of the compression coil spring is adjusted. If the relief valve does not operate even if the pressure is raised and the set pressure is reached, the work of lowering the degree of compression of the compression coil spring is repeated, and the relief valve is adjusted so that the relief valve operates at the set pressure. This work is very time-consuming, and fluids such as gas are also disposable, which is wasteful.

In addition, the spring constant of an urging member such as a compression coil spring decreases due to the so-called settling of the spring due to long-term use, and the urging force decreases. Further, the urging force fluctuates due to the fluctuation of the spring constant in a low temperature environment or a high temperature environment, the loosening of the screw mechanism or the like for urging the compression coil spring, and the like.

An object of the present invention is to provide a relief valve capable of easily adjusting a set pressure and monitoring fluctuations in the set pressure after setting.

The relief valve according to the present invention includes a body provided with a fluid inflow passage, an annular valve seat provided in the body, and a valve body housed in the body and urged to the valve seat by an urging member. The valve body is a relief valve capable of blocking and opening the fluid inflow passage by being moved by the fluid pressure in the fluid inflow passage, and the urging force of the urging member can be adjusted. , A sensor for detecting the urging force is provided on at least one end side of the urging member.

According to the relief valve of the present invention, since a sensor for detecting the urging force is provided on at least one end side of the urging member, the set pressure of the relief valve can be directly set by the information from this sensor. If the sensor is a pressure sensor, the set pressure can be set directly from the information of the pressure sensor, and if the sensor is a load sensor, the detected load can be divided by the pressure receiving area of the load sensor. Pressure can be calculated. In addition, a strain gauge or the like can also be used as a sensor.

It is preferable that the valve body is urged via a receiving member that receives the urging member, and the sensor is interposed between the valve body and the receiving member.

By using a compression coil spring as an urging member, providing a receiving member for receiving the compression coil spring, and providing a sensor between the compression coil spring and the valve body, information from the sensor can be stably extracted.

It is preferable that the relief valve has a transmission unit that transmits information detected by the sensor. This transmitter may be built in the sensor itself or may be provided separately from the sensor.

The relief valve is preferably combined with a monitoring device equipped with a personal computer or the like to form a valve monitoring system. In this case, the monitoring device includes a communication unit that receives signals from the sensors and signals received from the sensors. It is assumed that it has a determination unit for determining pass / fail and a storage unit for storing the result determined by the determination unit.

According to the relief valve of the present invention, since the sensor for detecting the urging force by the urging member is provided, the set pressure can be easily set and the fluctuation of the set pressure with time can be confirmed. It also becomes easy to reset the pressure.

FIG. 1 is a vertical cross-sectional view showing one embodiment of the relief valve according to the present invention. FIG. 2 is a diagram showing a valve monitoring system using a relief valve according to the present invention.

Embodiments of the present invention will be described below with reference to the drawings. In the following description, up / down / left / right means up / down / left / right in FIG.

FIG. 1 shows the whole of one embodiment of the relief valve of the present invention.

The relief valve 1 is for maintaining the pressure of the fluid in the fluid inflow passage 2a below a predetermined value by causing a part of the fluid to flow out when the pressure of the fluid in the fluid inflow passage 2a exceeds a predetermined value. As shown in FIG. 1, the body 2 having the fluid inflow passage 2a, the fluid outflow passage 2b and the recess 2c, and the annular valve seat 3 provided on the periphery of the upward opening of the fluid inflow passage 2a. A rod-shaped valve body 4 that opens and closes the fluid inflow passage 2a by being pressed by the valve seat 3 (moving in the closing direction) or separated from the valve seat 3 (moving in the opening direction), and the upper part of the recess 2c of the body 2. A cylindrical bonnet 5 whose lower part is inserted into the bonnet 5 and extends upward, a cylindrical cap 6 whose lower end is fixed to the upper end of the bonnet 5, and a compression coil spring (a urging member) that urges the valve body 4 downward. ) 7, the O-ring 8 fitted to the valve seat 3, the cylindrical O-ring retainer 9 fixed to the body 2 and pressing the O-ring 8 from above, and the urging force generated by the compression coil spring 7 (for example, It is equipped with a sensor 22 that detects (pressure).

The fluid inflow passage 2a opens downward and extends up and down, and its upper end opens to the bottom surface of the recess 2c of the body 2. The fluid outflow passage 2b opens to the right of the body 2 and extends to the left and right, and its left end opens to the right side of the recess 2c.

The valve seat 3 is a separate member from the body 2, is detachably fitted into the recess 2c of the body 2, and is received by the bottom surface of the recess 2c. The inner diameter of the valve seat 3 is slightly smaller than the diameter of the fluid inflow passage 2a.

The valve seat 3 includes a contact portion 11 whose lower surface abuts on the bottom surface of the recess 2c of the body 2, and a support portion 12 integrally provided on the upper side of the contact portion 11 to support the O-ring 8. .. The valve seat 3 may be fitted with a member different from the body 2, and the bottom surface of the recess 2c may be used as the valve seat 3 as it is.

The valve body 4 includes a large-diameter portion 13 and a small-diameter portion 14 above the large-diameter portion 13 and having an outer diameter smaller than that of the large-diameter portion 13. The outer diameter of the large diameter portion 13 is slightly larger than the inner diameter of the valve seat 3.

The bonnet 5 is fixed to the upper part of the body 2 by screwing the male threaded portion provided at the lower portion to the female threaded portion provided at the upper part of the recess 2c of the body 2. On the inner circumference of the bonnet 5, there is a small diameter inner peripheral portion 16 that slidably guides the small diameter portion 14 of the valve body 4, and a large diameter inner circumference that slidably guides the upper portion of the large diameter portion 13 of the valve body 4. A part 17 is provided.

An annular recess 17a is provided at the lower end of the large-diameter inner peripheral portion 17 of the bonnet 5, and an X ring 19 supported by the retainer 18 is arranged in the recess 17a. In addition to the X ring 19, an O-ring or the like may be used as long as it can support the large-diameter inner peripheral portion 17.

The cap 6 is fixed to the upper end of the bonnet 5 by screwing the lower end of the female screw portion provided on the inner circumference thereof to the upper end of the male screw portion provided on the upper portion of the bonnet 5. A lock nut 20 that prevents the cap 6 and the bonnet 5 from loosening is screwed in the middle of the male threaded portion of the bonnet 5.

The compression coil spring 7 is sandwiched between the lower surface of the top wall 6a of the cap 6 and the upper surface of the spring receiver (receiving member) 15 arranged in the bonnet 5. The lower surface of the spring receiver 15 is received by the upper end portion of the small diameter portion 14 of the valve body 4.

The sensor 22 in FIG. 1 is interposed between the receiving member 15 of the compression coil spring 7 and the small diameter portion 14 at the upper part of the valve body 4. With such an arrangement, the downward urging force of the compression coil spring 7 can be accurately detected.

The cap 6 and the body 2 are connected by a wire 10 so that the cap 6 is not only fixed to the bonnet 5 but also to the body 2.

〇 The ring retainer 9 is fixed to the lower part of the body 2 by screwing the male screw portion provided on the upper portion to the female screw portion provided on the lower portion of the recess 2c of the body 2.

A female screw is formed in the center of the top wall 6a of the cap 6, and a stopper 21 having a male screw portion screwed to the female screw is screwed.

The sensor 22 is provided with a recess on the lower surface of the spring receiver 15 by adhesion or press-fitting, and the lower surface of the sensor 22 is designed so that the upper end surface of the small diameter portion 14 on the upper portion of the valve body 4 comes into contact with the lower surface. There is.

According to this relief valve 1, when the pressure of the fluid in the fluid inflow passage 2a rises and exceeds the elastic force (urging force) of the compression coil spring 7 urging the valve body 4, the valve body 4 moves upward. This opens the fluid inflow passage 2a, and a part (or all) of the fluid is discharged from the fluid outflow passage 2b through the recess 2c of the body 2. As a result, the pressure of the fluid in the fluid inflow passage 2a decreases, and the elastic force of the compression coil spring 7 exceeds the pressure of the fluid, so that the fluid inflow passage 2a returns to the closed state. The amount of screwing between the cap 6 and the bonnet 5 is adjustable, and the elastic force of the compression coil spring 7 can be increased by tightening the cap 6 more than the bonnet 5. Therefore, by adjusting the elastic force of the compression coil spring 7, the set value of the pressure of the fluid in which the fluid inflow passage 2a is opened can be arbitrarily set.

If the sensor 22 is used as a pressure sensor, a signal related to the pressure detected by the sensor 22 is taken out by wire or wirelessly, and the detected pressure is known, the pressure at which the relief valve 1 actually operates can be known. If the detected pressure is smaller than the set pressure, the amount of screwing between the cap 6 and the bonnet 5 should be increased and tightened more to make adjustments. If the detected pressure is larger than the set pressure, the amount of screwing between the cap 6 and the bonnet 5 may be reduced and tightened less to make adjustments.

FIG. 2 is a schematic view showing an embodiment of a monitoring system including a relief valve 1 incorporating the above sensor 22 and a monitoring device 40.

The figure shows one of the relief valves 1 installed in equipment and plants.

The sensor 22 provided in the relief valve 1 wirelessly sends the identification number of the relief valve 1 to the monitoring device 40, and the identification number is received by the receiving antenna 41 of the receiving unit 42 and temporarily stored in the determination unit 43. To.

Next, the signal from the position sensor 22 enters the receiving unit 42 of the monitoring device 40 via the signal line (unsigned) and is sent to the determination unit 43. In addition to signal transmission via a wired signal line, a wireless signal transmission method may be used.

The determination unit 43 determines whether the signal from the relief valve 1 is within the allowable range of the set pressure, and stores the determination result and the identification number in the storage unit 44. This paired information can be displayed and confirmed on the display unit (not shown) of the monitoring device 40. The determination unit 43 may be built in the relief valve 1, and the determination result may be sent directly from the relief valve 1 to the mobile phone or personal computer of the person in charge.

Further, the monitoring system can send the paired information to the transmitting unit 45, transmit radio waves from the transmitting antenna 46 to the Internet network 47, and send the paired information to the centralized management server 48. The connection to the Internet network is not limited to wireless, and may be directly connected by wire.

If the signal from the relief valve 1 deviates from the allowable range of the set pressure, for example, an email is sent to the person in charge's mobile phone or personal computer stating that the signal deviates from the allowable range of the set pressure of the relief valve 1. The person in charge can know the abnormal situation of the device provided with the relief valve 1 in real time and can take necessary measures.

The relief valve 1 is not limited to the one shown in FIG. 1, as long as it is a relief valve in which the fluid inflow passage is opened by moving the valve body by the fluid pressure. By providing the above sensor 22, it is possible to grasp the operating pressure information of the relief valve and appropriately respond to an abnormality.

In the embodiment, the compression coil spring 7 is used as the urging member for urging the valve body 4, but the urging member is not limited to the spring. For example, there are various methods such as a method using an elastic body such as rubber or a flexible member, a method of urging by the pressure of a fluid such as a hydraulic piston or a pneumatic piston, a method using an electric force in combination with an electric motor and a gear, and the like. Method is available. Further, the place where the sensor 22 is installed is not limited to the space between the valve body 4 and the spring receiver 15, and may be installed on the top wall 6a (or plug 21) of the cap 6. In that case, a spring receiver 15 may be installed at the upper end of the compression coil spring 7. Then, the pressure can be measured by sandwiching the sensor 22 between the top wall 6a (or plug 21) of the cap 6 and the spring receiver 15.

As a method of adjusting the urging force when these various urging methods are used, for example, when an elastic body is used, the same amount of screwing as in the embodiment is used, and when a fluid pressure is used, an electric pressure regulator is used. When force is used, it can be appropriately adjusted by adjusting the voltage.

1: Relief valve
2: Body
2a: Fluid inflow passage
2b: Fluid outflow passage
2c: recess
3: Valve seat
4: Valve body
7: Compression coil spring (biasing member)
15: Spring receiver (reception member)
22: Sensor

Claims (3)

A body provided with a recess and a fluid inflow passage communicating with the recess, an annular valve seat provided in the body, and a valve body housed in the body and urged to the valve seat by an urging member. The valve body is a relief valve that can shut off and open the fluid inflow passage by being moved by the fluid pressure in the fluid inflow passage.
The urging force of the urging member is adjustable and
A relief valve provided with a sensor for detecting the urging force on at least one end side of the urging member. The relief valve according to claim 1, wherein the valve body is urged via a receiving member that receives the urging member, and the sensor is interposed between the valve body and the receiving member. The relief valve according to claim 1 or 2, further comprising a transmitting unit that transmits information detected by the sensor.

Images