JPH02125197A - Steam trap with valve - Google Patents

Abstract

PURPOSE:To save labor for operation by separating a passage selector valve body from a valve seat member with the displacement of a heat-reactive member, connecting the one face side of a strainer arranged on the primary side of a trap, and connecting the other face side to an outflow port via the passage selector valve body. CONSTITUTION:When the temperature of a fluid from an inflow port 6 is low, a bimetal 22 is curved, a selector valve main body 3 is pushed up from a valve seat member 4, and a valve inflow path 10 is communicated to an outflow port 7 via a gap 30 and a valve outflow path 13 to form a bypass passage. On the other hand, when the fluid temperature is high, the bimetal 22 is made flat, the selector valve body 3 is closely stuck to the valve seat member 4 by a spring 25 to eliminate the gap 30, and the bypass passage is closed. When an operating bar 20 is rotated by 90 deg. from the outside, the through hole 12 of the selector valve body 3 and the valve inflow path 10 and the valve outflow path 13 are communicated, and foreign objects accumulated in a strainer 8 are discharged to the outside together with the fluid in the bypass passage. The bypass passage is automatically opened when there is a relatively small quantity (low temperature) of fluid, and the cleaning of the strainer can be simply performed.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steam trap with a valve that combines a steam trap that automatically discharges only condensate from a steam piping system and pulp for flow path switching.

A steam trap is a type of automatic valve that automatically discharges only condensate produced after steam has done work, but its discharge valve opening is generally designed to be quite small compared to the diameter of the piping member. 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 during the initial start-up of steam-using equipment, there arises the problem that the condensate will stagnate if only the above-mentioned piping valve is used. 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 multiple 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. 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. By integrally forming the trap and the flow path switching valve, a bypass flow path function can be obtained by operating one flow path switching valve, and an increase in installation space due to piping is prevented.

<Problems to be Solved by the Present Invention> However, in the prior art described above, there was a problem in that cleaning of 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 then the strainer must be removed by removing the lid from the trap body and then cleaned. .

A strainer inside a steam trap is installed to prevent foreign matter such as dust from adhering to the trap's valve sealing surface and causing steam to leak, but steam traps are usually installed on the outlet side of various steam-using equipment. Since the steam trap is installed at the bottom or at the end of the steam piping, a lot of foreign matter such as dust and scale from the steam-using equipment and the piping gets mixed into the steam trap. Therefore, it is a very complicated task to take out the strainer from the trap body each time it is cleaned.

In addition, in the above-mentioned conventional technology, even when a relatively small amount of fluid is flowing through the bypass flow path, or when a relatively large amount of fluid is flowing through the bypass flow path, when the fluid must be flowed through the bypass flow path, There was also the complexity of having to operate the flow path switching valve to set the bypass flow path function. For example, in the case of batch-operated steam-using equipment that repeatedly starts and stops at regular intervals, a large amount of condensate is generated when the equipment first starts up because it is cool to about room temperature. During the second and third rises, not that much condensate is generated and it is not necessarily necessary to fully open the bypass passage, but in order to shorten the rise time of steam-using equipment, it is necessary to switch the passage each time. The valve must be operated to function as a bypass flow path.

Therefore, the technical problem of the present invention is that when a relatively small amount of fluid has to flow, the bypass passage automatically opens and closes, thereby saving the effort of operating the passage switching valve, and making it easy to clean the strainer. The objective is to obtain a steam trap with a valve that can be used.

Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is that in a device in which a flow path switching valve and a steam trap are integrally formed, the flow path switching valve body is 1 for valve seat member
A heat-responsive member is provided at one end of the flow-path switching valve body, and displacement of the heat-responsive member causes the flow-path switch-over valve body to separate from the valve seat member, and the primary side of the trap A strainer that filters the flow through fine holes is disposed in the drain, one side of the strainer is communicated with the inlet, and one side of the strainer is communicated with the outlet via the flow path switching valve body.

Due to the provision of the thermally responsive member, when the temperature of the fluid flowing inside the trap is low, the thermally responsive member is displaced and moves the flow path switching valve body away from the valve seat member, automatically opening the valve port. do.

When the valve port opens, the inlet, one side of the strainer, and the outlet communicate with each other. When the fluid temperature becomes high, the thermally responsive member is displaced to its original shape and no longer has the effect of lifting the flow path switching valve body from the valve seat member.

Further, foreign substances such as dust and scale in the fluid flowing in from the inlet are filtered out on one side of the strainer and deposited on that side. When the flow path switching valve is operated to open the switching valve port, the inlet, one side of the strainer, and the outlet are communicated, and the accumulated foreign matter is removed from the outlet by the fluid flowing through the bypass flow path. be excluded from the outside.

<Effects of the Invention> When the fluid temperature is low, the inlet, one side of the strainer, and the outlet automatically communicate with each other, thereby saving the effort of operating the flow path switching valve each time.

In addition, by operating the flow path switching valve and opening the switching valve port, the strainer can be removed from the trap body without being removed.
Can be cleaned by fluid flowing through the bypass flow path,
Cleaning the strainer becomes very easy.

<Example> An example showing a specific example of the above technical means will be described. (
(See FIGS. 1 and 2) The flow path switching valve 1 and the steam trap 2 are airtightly connected with bolts 50 via an upper lid 51 to form a steam trap with a valve. The flow path switching valve 1 is formed by a switching valve body 3 and a valve seat member 4. The main body 5 is formed with an inlet 6 and an outlet lower. A trap valve chamber 18 is provided in the main body 5 in communication with the inlet 6, and a substantially cylindrical strainer 8 having pores in the upper part is provided.
The strainer is attached via a member 11 using a snap ring 9. The inside of the cylindrical strainer 8 is the valve seat member 4
It communicates with the switching valve body 3 through a single inlet passage 10 provided in the valve body 3 .

The switching valve body 3 and the outflow lower are communicated with each other through an upflow and outflow passage 13. The single inlet passage 10, the switching valve body 3, and the upstream/outlet passage 13 form a bypass passage.

A hollow float 14 is arranged in a free state in the trap valve chamber 8, which rises and falls according to the level of inflowing condensate water. A trap valve seat 15 is attached to the lower part of the trap valve chamber 18 so as to protrude into the valve chamber. A trap valve port 16 provided on the trap valve seat 15 communicates with the outflow lower via an upright passage 17. Reference number 52 pushes up the float 14 at low temperatures;
It is a conventionally used bimetal that does not participate at high temperatures.

The switching valve body 3 is cock-shaped and has a single inflow passage 10 and an upstream/outflow passage 1.
A through hole 12 is provided substantially coaxially with the upper lid 51, and an operating rod 20 protruding to the outside of the upper lid 51 is integrally provided at the upper part. Switching valve body 3
A plurality of disc-shaped bimetals 22 as thermally responsive members are disposed at the lower part of the heat-responsive member. When the temperature is low, the bimetal 22 curves and pushes the switching valve body 3 upward, as shown in FIG. A coil spring 25 is disposed above the switching valve body 3 via a sliding plate 23 and a washer 24 to bias the switching valve body 3 downward.

The space between the switching valve body 3 and the upper lid 51 is kept airtight with a backing 2]. Reference number 26 is a holding member that holds the backing 21, and 27 is a sleeve that supports rotation of the operating rod 20.

In the above configuration, when the temperature of the fluid flowing in from the inflow port 6 is low, the bimetal 22 curves as shown in FIG. A gap 30 is created, and the inlet 6 becomes a single inlet channel 10.
, gap 30. It communicates with the outflow lower via the upstream/outflow path 13 to form a bypass flow path. When the fluid temperature increases, the bimetal 22 becomes flat as shown in FIG. 2, and the switching valve body 3
When the coil spring 25 brings the valve seat member 4 into close contact with the valve seat member 4, there is no gap and the bypass flow path is closed.

Therefore, the bypass flow path can be automatically opened and closed depending on the fluid temperature.

Furthermore, when the operating rod 20 is rotated 90 degrees from the illustrated state using a handle (not shown) or the like, the through hole 1 of the switching valve body 3
2, a single inlet passage 10, and an upstream/outlet passage 13 communicate with each other, and foreign substances such as dust and scale accumulated inside the strainer 8 are removed from the strainer together with the fluid in the bypass passage. Therefore,
The strainer can be easily cleaned without removing it from the main body.

[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 sectional view of the main parts. 1 Flow path switching valve 2° Steam trap 3, switching valve body 4: Valve seat member 5: Main body 6: Inflow port - Outflow port 8° Strainer] 0° Valve inflow path 13; Recirculation path

Claims (1)

[Claims] 1. In a device in which a flow path switching valve and a steam trap are integrally formed, the flow path switching valve body is slidably arranged relative to the valve seat member, and a thermally responsive member is provided at one end of the flow path switching valve body. hand,
The flow path switching valve body is separated from the valve seat member by the displacement of the thermally responsive member, and a strainer is disposed on the primary side of the trap to filter the flow with pores, and one side of the strainer is communicated with the inlet. A steam trap with a valve, characterized in that one side of the strainer is communicated with an outlet via the flow path switching valve body.