JPH0740796Y2 - Steam trap with valve - Google Patents

Description

[Detailed Description of the Invention] <Industrial field of application> The present invention is a combination of a steam trap that automatically discharges only condensate from a steam piping system and a flow path switching valve, and the flow path switching The present invention relates to a steam trap with a valve in which the valve is operated by driving means such as an actuator.

<Prior art> Generally, a steam piping system includes a boiler that generates steam, steam piping that sends the generated steam to a distant steam-using device, valves that control the pressure and flow rate of passing steam, and steam. It consists of the equipment to be used and a steam trap installed on the steam piping or on the secondary side of the equipment using steam. In this way, the steam trap is installed at the end of the system as a whole system on the way of piping and far from the boiler.

This steam trap is a kind of automatic valve that automatically discharges only the condensate generated after steam has performed its work, but its discharge valve port is generally designed to be considerably smaller than the diameter of the piping member. . This is because the specific volume of the condensate is very small compared to the specific volume of the steam, and also the leakage of the steam is prevented as much as possible.

<Problems to be solved by the present invention> Therefore, when a large amount of condensate is generated, such as when the steam-using device is initially started up, it is possible to condense water into the steam pipe or inside the steam-using device only with the small valve opening. However, there is a problem in that Then, the accumulated low temperature condensate and the newly introduced high temperature steam violently collide with each other, resulting in a water hammer causing a large noise and a remarkable pressure fluctuation. In other words, it is considered that the condensate that could not be completely discharged by the steam trap was caught in the high-speed steam at high temperature and moved, and hit the curved part of the pipe.

If this water hammer occurs, there is a risk of damaging the parts lacking the strength of the pipe, steam-using equipment, and the connecting flange part due to the shocking pressure fluctuations, and steam may be ejected. Further, the shocking pressure fluctuation may be transmitted through the pipe and damage the steam trap at the end.

As a countermeasure against this, a bypass flow path with a relatively large diameter pipe was installed in parallel with the steam trap, and the flow path was manually switched to the bypass flow path at the start of operation or at the initial startup to quickly eliminate the initial condensate. In addition, the pressure fluctuation due to the generated water hammer was released through the bypass valve. However, in this case, it is necessary to operate a plurality of valves in order to switch each flow path, and a large installation space is required to provide a bypass flow path.

Therefore, the technology of a steam trap with a built-in valve function is disclosed in Japanese Utility Model Publication No. 50-31962. This is because the flow passage switching valve is formed integrally with the trap in the trap body, and the normal passage trap function, the bypass flow passage function, and the closing function are exhibited by manually operating the flow passage switching valve. Is something that can be done. By integrally forming the trap and the flow path switching valve, the bypass flow path function can be obtained by the manual operation of one flow path switching valve, and the installation space due to piping is prevented from increasing.

However, even in the case of this technique, there is still the complexity of having to manually operate the flow path switching valve element. That is,
It is necessary to manually operate the valve element for switching to the bypass flow passage at the initial startup or whenever a water hammer occurs.

Therefore, the technical problem of the present invention is to provide a steam trap that can quickly start up a steam-using device and avoid a water hammer when it occurs.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems controls the steam piping for supplying the steam generated from the boiler and the pressure or flow rate of the steam. Installed on the valve, steam-using device, and on the side of steam piping or on the secondary side of the steam-using device, the flow path switching valve and steam trap are integrally formed, and the flow path switching valve can be operated by valve element driving means such as an actuator. In a steam piping system consisting of equipment such as a steam trap with a valve, a vibration sensor is attached on the way of the steam piping, and the driving means of the flow path switching valve of the steam trap with a valve is opened / closed based on the signal. It is designed to be operated.

<Operation> The valve integrally formed with the steam trap is operated by driving means such as an actuator, and manual operation of the valve body is not required at all. Further, the valve body driving means is opened by the detection signal from the vibration sensor when the water hammer occurs.

<Example> An example showing a specific example of the above technical means will be described.
(See FIG. 1 and FIG. 2) In this embodiment, as shown in FIG.
42 is a steam piping system including steam traps 44 and 46 with valves, steam piping 48, a control device 50, and a vibration sensor 52. Steam trap with valve 44,46, control device 50,
The vibration sensors 52 are connected by signal lines. The steam trap with valve 44 discharges the condensate generated in the steam-using device, and 46 discharges the condensate generated in the pipe. Reference number 54
Is a boiler.

The steam traps 44 and 46 with valves will be described with reference to FIG.

The flow path switching valve 1 and the steam trap 2 are airtightly coupled with the bolt 4 via the upper lid 3 to form a steam trap with a valve.

The flow path switching valve 1 is formed by a switching valve body 6 having a through hole 5 and a valve seat member 7. The body 8 has an inlet 9 and an outlet 10. A trap valve chamber 11 communicating with the inflow port 9 and provided in the main body 8
And a substantially cylindrical strainer 12 having pores at the top.
Is attached by a snap ring 13 via a strainer attaching member 14. The inside of the cylindrical strainer 12 communicates with the switching valve body 6 by the valve inflow passage 15 provided in the valve seat member 7.
The switching valve body 6 and the outflow port 10 are connected by a valve outflow passage 16, and a valve inflow passage
A bypass passage is formed by 15, the switching valve body 6, and the valve outflow passage 16.

In the trap valve chamber 11, a hollow float valve 17 that floats and descends according to the level of condensate that flows in is arranged in a free state, and a trap valve seat 18 is attached to the lower part so as to project into the valve chamber. The trap valve port 19 provided in the trap valve seat 18 communicates with the outflow port 10 via the rising passage 20. Reference numeral 21 is a conventionally used bimetal that pushes up the float 17 at a low temperature (state shown in FIG. 1) and does not participate at a high temperature.

The switching valve body 6 has a cock shape, and has a through hole 5 substantially coaxial with the valve inflow path 15 and the valve outflow path 16, and engages with an operation rod 22 penetrating the inside of the upper lid 3 at the upper part. The upper end of the operating rod 22 is connected to an output shaft 24 of a motor 23 as a valve body driving means. In addition to the above motor, the valve body driving means may be, for example, an air actuator that operates with compressed air, a hydraulic actuator, or the like. Along with the rotation of the output shaft 24 at the center of the output shaft 24, the operation rod 22 is manually operated separately from the rotation of the motor 23.
Attach the operation handle 25 so that can be rotated. For this, a part of the output shaft 24 is chamfered, and a fitting hole that matches the facing portion of the operation handle 25 is provided for mounting.
A deceleration mechanism (not shown) for generating a torque required to drive the valve element 6 to rotate is built in the motor 23. A cord 26 for connecting the motor 23 to a power source (not shown) and a control device 50 for switching the operation is attached to the motor mount 27.

A sequencer, a programmable controller, or the like can be appropriately selected as the control device 50 for switching the operation of the motor 23. In the present embodiment, a signal from the control device 50 is transmitted to the control unit 28 via the code 26 and drives and controls the motor 23. Reference numeral 29 is a cover for protecting the motor 23 and the control unit 28.

A plurality of disc-shaped bimetals 30 as heat responsive members are arranged below the switching valve body 6. Bimetal 79 is the first at low temperatures
As shown in the figure, it bends and pushes the switching valve body 6 upward. The switching valve body 6 is provided above the switching valve body 6 with a slide plate 31 interposed therebetween.
A coil spring 32 for urging the lower part is arranged. A space between the switching valve body 6 and the upper lid 3 is kept airtight by a packing 33. reference number
34 is a holding member that holds the packing 33, and also 35
Is a sleeve for supporting the rotation of the operating rod 22.

In the above structure, when the temperature of the fluid flowing in from the inlet 9 is low, both the bimetals 21 and 30 are curved as shown in FIG. 1, and the bimetal 30 is curved to push up the switching valve body 6 and A gap 36 is formed between the seat member 7 and
The inflow port 9 communicates with the outflow port 10 through the valve inflow path 5, the gap 36, and the valve outflow path 6 to form a bypass flow path, and the bimetal 21 is bent to push up the float valve 17 and push up the trap valve opening 19 Opens to expel cryogenic fluid. When the fluid temperature rises, the bimetal 30 becomes flat, and the switching valve body 6 comes into close contact with the valve seat member 7 by the coil spring 32 so that the gap 36 disappears and the bypass flow passage is closed, and the bimetal 21 also becomes flat and participates in the float valve 17. Function as a normal steam trap, that is,
When the condensate flows in, the float valve 17 rises to open the trap valve opening 19, and when steam flows in, the buoyancy of the float valve 17 disappears and the trap valve opening 19 is closed, and only the condensate is automatically added. Fulfills the function of discharging to. That is, the low temperature condensate that accumulates at the initial rise is forcibly discharged.

In the present embodiment, a cock is used as the flow path switching valve, and a float type is shown as the steam trap, but the steam trap is not limited to these.For example, a ball valve or a butterfly valve as the switching valve, As the steam trap, a disc type, a bucket type, a thermo type or the like can be used.

The operation will be described with reference to FIG. 2. If a water hammer occurs when the steam-using device starts up, a shocking pressure fluctuation is detected by the vibration sensor 52, and based on the signal, the control device 50 causes the steam with valve to be steamed. A signal for opening operation is sent to the drive unit of the flow path switching valve 1 of the traps 44 and 46, and the switching valve body 6
Opens and a bypass passage is formed. Therefore, the low-temperature condensate accumulated in the pipe and the shocked rising pressure fluctuation are discharged to the atmosphere through the bypass passage. Then, after a time preset by the control device 50, a signal for closing operation is issued to close the bypass passage.

In addition, a switch that outputs an operation signal for forcibly opening and closing the flow path switching valve of the steam trap with a valve can be provided in the control device 50.

Further, although the vibration sensor is used in this embodiment, a pressure sensor may be used.

<Effects of the device> It is not necessary to manually operate the flow path switching valve, and it is possible to automatically discharge the initial low-temperature condensate that accumulates in the pipes and steam-using equipment, resulting in a significant improvement in work efficiency and a water hammer. It is possible to avoid the occurrence of the above and prevent damage to the equipment.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a steam trap with a valve of the present invention, and FIG. 2 is a steam piping system system diagram shown in the embodiment. 40: Pressure reducing valve, 42: Steam equipment 44,46: Steam trap with valve 1: Flow path switching valve, 2: Steam trap 6: Switching valve body, 7: Valve seat member 9: Inlet port, 10: Outlet port 17 : Float valve, 52: Vibration sensor

Claims (1)

[Scope of utility model registration request] 1. A steam pipe for feeding steam generated from a boiler, a valve for controlling the pressure or flow rate of steam, a steam-using device, and a steam pipe installed on the way or on the secondary side of the steam-using device. A steam piping system comprising a device such as a steam trap with a valve in which a path switching valve and a steam trap are integrally formed and the flow path switching valve can be operated by a valve body driving means such as an actuator. A steam trap with a valve, wherein a vibration sensor is attached to the valve, and the drive means of the flow path switching valve of the steam trap with the valve is opened / closed based on a signal from the vibration sensor.