JPH0668355B2 - Steam trap with valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a steam trap with a valve in which a steam trap for automatically discharging only condensed water from a steam piping system and a valve for switching a flow path are combined.

The steam trap is a kind of automatic valve that automatically discharges only the condensate generated after the steam has performed its work, but its discharge valve port is generally designed to be considerably smaller than the pipe member diameter. 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. Therefore, when a large amount of condensate is generated, such as when the steam-using device is initially started up, there is a disadvantage that the condensate stays only with the small valve opening. As a countermeasure against this, a bypass flow path with a pipe having a relatively large diameter is provided in parallel with the steam trap, and the flow path is also manually switched to the bypass flow path at the start of operation or at the initial startup. 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.

<Prior Art> Conventionally, there has been a technology of a steam trap with a valve as disclosed in Japanese Utility Model Publication No. 50-31962. This is because by forming a flow path switching valve in the trap body integrally with the trap and manually operating the flow path switching valve,
It is possible to exhibit a normal trap function, a bypass flow path function, and a closing function. 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.

<Problems to be Solved by the Present Invention> However, in the above-mentioned prior art, there is still the complexity of manually operating the flow path switching valve element. That is, when a steam trap with a valve is attached to a steam-using device of a batch system that repeatedly operates and stops, it is necessary to manually operate the valve element to switch to the bypass flow path each time it operates. In particular, this operation becomes very complicated when the interval between actuation and deactivation is short or when the frequency of switching is high.

Further, in the above-mentioned prior art, there is a problem that the strainer is complicated to clean. In other words, in order to clean the strainer, it is necessary to operate the flow path switching valve so that it has a bypass flow path function or a closing function, and then remove the strainer by removing the lid from the trap body before cleaning. is there.

The strainer installed in the steam trap is installed to prevent foreign matter such as dust from adhering to the trap valve sealing surface and leaking steam, but the steam trap is usually the outlet side of various steam-using equipment. Since it is attached to the lower part or the end of the steam pipe, a lot of foreign matter such as dust and scale in the steam using device and the pipe is mixed in the steam trap. Therefore, removing the strainer from the trap body each time cleaning is a very complicated work.

Therefore, the technical problem of the present invention is to obtain a steam trap with a valve that can easily clean the strainer and does not require manual operation of the flow path switching valve.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above technical problems is a flow path switching valve and a steam trap that are integrally formed. A strainer for catching foreign matter such as dust is arranged, the flow path switching valve is slidably arranged with respect to the valve seat, and one end of the flow path switching valve is connected to the primary side of the strainer to clean the strainer. A member is attached and the other end of the flow path switching valve is connected to the valve drive means.

<Operation> By connecting the valve drive means to the flow path switching valve, the flow path switching valve can be operated via the valve driving means, and no manual operation of the valve is required.

The strainer cleaning member attached to the end of the flow path switching valve causes the primary side of the strainer, that is, the side on which foreign matter such as dust is captured and accumulated, to be driven by the valve drive means, and the strainer is automatically cleaned. To be done.

<Effect of the Invention> The strainer is automatically cleaned by the valve driving means, and the operation for obtaining the maximum efficiency of the steam-using device can be automated without the need to manually operate the valve.

<Example> An example showing a specific example of the above technical means will be described.
(Refer to FIG. 1) The flow path switching valve 1 and the steam trap 2 are airtightly coupled with the bolt 50 via the 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 having a through hole 12 and a valve seat portion 4. The body 5 has an inlet 6 and an outlet 7. A trap valve chamber 18 is provided in the main body 5 so as to communicate with the inflow port 6, and a substantially cylindrical strainer 8 having pores on the primary side of the trap valve chamber 18 is attached by a snap ring 9. The inside of the cylindrical strainer 8 communicates with the switching valve body 3 through the valve inflow passage 10. The switching valve body 3 and the outlet 7 are connected to the valve outflow passage.
Connect with 13. The valve inflow passage 10, the through hole 12, and the valve outflow passage 13 form a bypass flow passage.

Inside the trap valve chamber 18, a hollow float 14 that floats and descends according to the level of condensate flowing in is arranged in a free state. The trap valve seat 15 is provided below the trap valve chamber 18 by projecting into the valve chamber.
Install. Trap valve opening 16 provided in the trap valve seat 15
Communicates with the outlet 7 via the rising passage 17.

The switching valve body 3 is ball-shaped and is rotated by the driving means of the flow path switching valve 1 described below, and when the through hole 12 is positioned substantially coaxial with the valve inflow passage 10 and the valve outflow passage 13, the bypass passage is opened ( Rotate 90 degrees to close the bypass passage (state shown in Fig. 1). The shaft portion 3a of the switching valve body 3 penetrates through the inside of the upper lid 51 and the operating rod.
Engage with 20. The upper end of the operating rod 20 is connected to an output shaft 61 of a motor 60 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. The operation rod 20 is rotated by the rotation of the motor 60, and the switching valve body 3
Also rotates.

The shaft portion 3a of the switching valve body 3 extends downward and the lower end portion is arranged on the primary side portion of the strainer 8, that is, the side communicating with the inflow port 6, and the metal brush 30 as a strainer cleaning member is provided.
Install along the axis. The end of the metal brush 30 is attached so as to be in contact with the inner peripheral surface of the strainer 8, and is fixed so as not to fall off even when the motor 60 rotates.

A cord (not shown) for connecting the motor 60 and various devices (not shown) for switching the power source and the operation is attached. Reference number 66 is a cover that protects the motor 60 and reference number 67
Is a plug.

In the above structure, the motor 60 is driven in response to the signal for switching the operation of the motor 60, the operating rod 20 rotates, and the switching valve body 3 rotates, whereby the through hole 12, the valve inflow passage 10, and the valve outflow passage. While the 13 communicates (state shown in FIG. 1), a bypass flow path is automatically formed, and the metal brush 30 also rotates to automatically clean the inner peripheral surface of the strainer 8.

By switching the operation signal, the operating rod 20 is rotated in the opposite direction, and the valve inflow path 10 and the valve outflow path 13 are blocked by the switching valve body 3, thus functioning as a normal steam trap.

Foreign matter that has been cleaned and dropped from the inner circumference of the strainer 8 accumulates in the accumulation portion 31 at the bottom of the main body 5 and is appropriately removed to the outside by removing the plug 67.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a steam trap with a valve of the present invention. 1: Flow path switching valve, 2: Steam trap 3: Switching valve body, 4: Valve seat part 5: Main body, 6: Inlet port 7: Outlet port, 8: Strainer 10: Valve inflow channel, 13: Valve outflow channel 14 : Float, 20: Control rod 30: Metal brush, 60: Motor

Claims (1)

[Claims] 1. A flow passage switching valve and a steam trap which are integrally formed, wherein a strainer for catching foreign matters such as dust is arranged on the primary side of the steam trap, and the flow passage switching valve slides against a valve seat portion. A steam trap with a valve that is movably arranged, has one end of the flow path switching valve connected to the primary side of the strainer and is provided with a strainer cleaning member, and the other end of the flow path switching valve is connected to valve driving means. .