JPH0535800B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a steam trap with a valve that combines a steam trap that automatically discharges only condensate from a steam piping system and a valve for switching flow paths. Regarding.

A steam trap is a type of automatic valve that automatically discharges only the condensate that is generated after steam has done its work, but its discharge valve opening is generally designed to be much smaller than the diameter of the piping components. . This is because the specific volume of condensate is very small compared to the specific volume of steam, and also to prevent steam leakage as much as possible. Therefore, when a large amount of condensate is generated, such as when steam-using equipment is initially started up, using only the small valve opening causes problems such as condensate stagnation. As a countermeasure against this problem, a bypass flow path using relatively large-diameter piping is provided in parallel with the steam trap, and the flow path is switched to the bypass flow path at the start of operation or initial start-up. However, in this case, it is complicated to operate a plurality of valves to switch each flow path, and a large installation space is required to provide a bypass flow path.

<Prior Art> Conventionally, there has been a technology of a steam trap with a valve as shown in, for example, Japanese Utility Model Publication No. 50-31962. This is because a flow path switching valve is formed in the trap body and integrated with the trap, and by operating the flow path switching valve, the normal trap function, bypass flow path function, and closing function are performed. It is something that can be done.

<Problems to be Solved by the Present Invention> The above-mentioned prior art had a problem in that cleaning the strainer was complicated. In other words, in order to clean the strainer, the flow path switching valve must be operated to set the bypass flow path function or the closing function, and the strainer must be removed by removing the lid from the trap body before cleaning. .

The strainer installed in the steam trap is
Steam traps are installed to prevent foreign matter such as dust from adhering to the valve sealing surface of the trap and causing evaporation to leak, but steam traps are usually installed at the bottom of the outlet side of various steam-using equipment or at the end of steam piping. Because of the installation, a large amount of foreign matter such as dust and scale from steam-using equipment and pipes gets mixed into the steam trap. Therefore, it is a very tedious task to remove the strainer from the trap body each time it is cleaned.

The technical problem of the present invention is to obtain a steam trap with a valve that allows easy cleaning of the strainer.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above-mentioned technical problems is to integrally form a flow path switching valve and a steam trap, and to , which can perform both the trap function and the bypass flow path closing function, is equipped with a strainer on the primary side of the trap that filters the flow with pores, one side of the strainer is communicated with the inlet, and the flow path is closed. The inlet, one side of the strainer, and the outlet are communicated with each other when the bypass passage function is performed by switching the switching valve.

<Operation> Foreign matter such as dust and scale in the fluid flowing in from the inlet is filtered out on one side of the strainer and accumulated on that side. The estimated foreign matter is transported out of the system from the outlet by the fluid flowing through the bypass channel by communicating the inlet, one side of the strainer, and the outlet when the bypass channel is functioning, such as during the initial start-up of steam-using equipment. be excluded.

<Effects of the Invention> When the bypass passage is functioning, the strainer can be cleaned by the fluid flowing through the bypass passage without having to be taken out from the trap body, and the strainer can be cleaned very easily.

<Example> An example showing a specific example of the above technical means will be described. (See Figures 1 and 2) Figure 1 is a cross-sectional view of a steam trap with a valve.
FIG. 2 shows a cross-sectional view taken along the line A--A in FIG.

A flow path switching valve 1 and a steam trap 2 are airtightly connected with bolts 50 to form a steam trap with a valve. The flow path switching valve 1 is formed by a valve casing 3 and a switching valve body 4. An inlet 5 and an outlet 6 are formed in the valve casing 3 . A substantially cylindrical space 7 is provided in the valve casing 3 in communication with the inlet 5, and a substantially cylindrical strainer 8 having pores in the space 7.
Attach with the snap spring 9. The inside of the space 7 communicates with the switching valve body 4 from the outer circumference of the strainer 8 through a valve inflow path 10 . The switching valve body 4 and the steam trap 2 communicate with each other through a trap inlet passage 11 and a trap outlet passage 12. Furthermore, the trap outlet passage 12 and the valve outlet passage 13 are communicated via the switching valve body 4 . The valve outlet passage 13 communicates with the outlet 6. A bypass passage 14 is provided on the inner periphery of the strainer 8 at an end within the space 7 . The bypass passage 14 communicates with the trap outlet passage 12 via the switching valve body 4.

The switching valve body 4 is disc-shaped, and has four through holes 15, 16, 1 on the same diameter as the valve inflow path 10 and the valve outflow path 13.
7 and 18 (see FIG. 2), a shaft portion 19 for pivotally supporting the rotational movement is provided in the center, and an operating rod 20 protruding to the outside of the valve casing 3 is integrally provided on the outer peripheral portion. The switching valve body 4 and the valve casing 3 are in airtight contact with O-rings 21 and 22.

The steam trap 2 is the trap casing 2
5 and the lid 26 form a variable pressure chamber 27, and a disc valve body 28 is disposed within the valve chamber 27. Reference numeral 51 denotes a bimetal ring which contracts when the fluid temperature is low and forcibly opens the disc valve body 28 via the retaining ring 52. The trap casing 25 and the switching valve body 4 are kept airtight by two O-rings 30 and 31.

First, to explain the function of the bypass flow path in Figures 1 and 2, the inlet 5 is connected to steam-using equipment (not shown), and the condensate generated in the steam-using equipment is discharged from the inlet 5. It passes through the strainer 8, the valve inflow path 10, the through hole 17 in the switching valve body 4, the trap inflow path 11, and reaches the pressure transformation chamber 27, the trap outflow path 12, the through hole 18 of the switching valve body 4, and the valve outflow path. 13 and is discharged outside the vessel from the outflow port 6, and from the inflow port 5 through the inner periphery of the strainer 8, that is, the area where foreign matter such as dust and scale is accumulated, to the bypass flow path 14 and the switching valve body 4. Through hole 1
6. It passes through the trap outlet passage 12, again through the through hole 18 of the switching valve body 4, passes through the valve outlet passage 13, and is discharged from the outlet 6 to the outside of the vessel. Therefore, the foreign matter in the strainer 8 is removed to the outside of the vessel along with the fluid in the bypass channel. In this case, since the pressure on the inflow port 5 side is applied inside the variable pressure chamber 27 of the trap 2, no foreign matter will flow into the variable pressure chamber 27.

Next, when the operating rod 20 is rotated 45 degrees clockwise (position B in FIG. 2), the switching valve body 4 is also rotated 45 degrees, and the through hole 15 is positioned above the valve inflow path 10, and the through hole 16 is located on the valve outlet passage 13 and performs the normal trap function. In this case, there are no through holes on the bypass channel 14.

Next, when the operating rod 20 is further rotated 45 degrees clockwise (position C in FIG.
5, 16, 17, and 18 are not present and perform a closing function.

As mentioned above, by rotating the switching valve body 4, the trap function, bypass flow path function, and closing function can be performed, and the inside of the strainer 8 can be cleaned at the same time when the bypass flow path function is being performed. It will be very simple.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a steam trap with a valve according to an embodiment of the present invention, and Fig. 2 is a cross-sectional view taken along A-A in Fig. 1.
FIG. 1: Flow path switching valve, 2: Steam trap, 4:
Switching valve body, 5: inlet, 6: outlet, 8: strainer, 10: valve inlet, 13: valve outlet, 14:
Bypass flow path, 15, 16, 17, 18: through hole, 20: operating rod, 27: variable pressure chamber.

Claims (1)

[Claims] 1. In a steam trap in which a flow path switching valve and a steam trap are integrally formed and each of the trap function, bypass flow path function, and closing function can be performed by operating the flow path switching valve, the flow is controlled by small holes on the primary side of the trap. A strainer is arranged to separate the water, one side of the strainer is communicated with an inlet, and the inlet, one side of the strainer, and the outlet are communicated when the bypass flow path is functioned by switching the flow path switching valve. A steam trap with a valve.