JPH09280490A - Steam trap provided with valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam trap provided with a valve, for functioning as a bypass passage without necessitating any driving source manual or electrical, and capable of preventing back flow of foreign matters into a trap chamber. SOLUTION: A temperature sensing valve 8 is arranged between an inlet 5 and a trap chamber 4. A bypass passage 7 is provided on below a temperature sensing valve body 10 through a valve seat member 12. The inlet 5 and an outlet 6 are communicated with each other by the bypass passage 7. A check valve 20 is attached on the lower part of the bypass passage 7 and between the trap chamber 4 and the outlet 6. When the temperature of fluid from the inlet 5 is low, the temperature sensing valve 8 is opened to automatically open the bypass passage 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a steam generator for automatically discharging only condensate produced by condensation of steam from a steam piping system.
The present invention relates to a combination of a mutrap and a flow path switching valve that switches the flow path to the steam trap flow path or a bypass flow path that directly connects the inlet and the outlet.

[0002]

2. Description of the Related Art A conventional steam trap with a valve is disclosed in, for example, Japanese Utility Model Publication No. 50-31962. This is a flow path switching valve in the trap body,
By being integrally formed with the trap and rotating the flow path switching valve, the normal trap function, the bypass flow path function, and the closing function can be exhibited.

[0003]

However, in the above-mentioned conventional apparatus, there has been a problem that the flow path switching valve must be rotated. In the case of manual operation, it must be operated manually, or even if it is performed automatically, some kind of power such as electric power is required, and the wiring becomes complicated.

Further, in the above-mentioned conventional apparatus, when the bypass flow passage which connects the inlet and the outlet is used, the outlet passage and the trap chamber are also communicated with each other, and dust, iron rust, etc. accumulated in the outlet passage. However, there is a problem that the foreign matter in the trap chamber is caused to flow back into the trap chamber and the sealing property of the trap in the trap chamber is obstructed.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a steam trap with a valve which does not require a driving source such as human hands or electricity and which can prevent backflow of foreign matter into the trap chamber.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above problems is to form a flow path switching valve and a steam trap by an integral casing, and to introduce the casing into the casing. In addition to forming a trap chamber and an outlet, and those that can be switched as a steam trap channel or bypass channel by switching the channel switching valve,
A bypass flow passage that connects the inlet and the outlet is formed, and a temperature responsive valve that opens at low temperature and closes at high temperature is arranged at the inlet side of the bypass flow passage, and a trap chamber is provided at the outlet side of the bypass flow passage. The check valve is arranged to allow only the flow of fluid from the outlet to the outlet.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION A temperature responsive valve on the inlet side of a bypass flow passage opens when the temperature of a fluid flowing into the inlet is a low temperature of a predetermined temperature, and connects the inlet and the outlet through the bypass flow passage. As a result, the bypass flow path function is achieved. In this case, the check valve on the outlet side of the bypass flow passage prevents the fluid from flowing from the outlet side to the trap chamber, thereby preventing the foreign matter from flowing back to the trap chamber.

When the temperature of the fluid flowing from the inlet reaches a predetermined high temperature, the temperature responsive valve closes to close the bypass passage, and only the inlet, the trap chamber and the outlet communicate with each other to perform a normal trap function. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment showing a specific example of the above technical means will be described. In FIG. 1, a lid 2 is fastened to a main body 1 with bolts 3 to form a trap casing having a trap chamber 4 inside. An inlet 5 is formed in the upper portion of the body 1 and an outlet 6 is formed in the lower portion.

A bypass passage 7 is formed in the main body 1 to connect the inlet 5 and the outlet 6, and a temperature responsive valve 8 is arranged on the inlet 5 side. The temperature-responsive valve 8 is composed of a plurality of disc-shaped bimetal plates 9 as temperature-responsive elements and a temperature-responsive valve body 10 which is also in a substantially disc-shape and which is in contact with the lower end portion thereof.
A return coil spring 11 having a function of returning the valve body 10 to the upper side and a ring-shaped valve seat member 12 facing the valve body 10 and arranged at the upper end portion of the bypass passage 7 are arranged in the lower part of the above. A support rod 13 is integrally formed on the upper portion of the temperature responsive valve body 10, and a support hole 15 provided at the center of the plug 14 is vertically movable.

Inside the trap chamber 4 communicating with the inlet 5 and the outlet 6, a hollow float 16 is arranged in a free state, and a trap valve seat 17 is attached to the lower portion of the trap chamber 4. A through hole 18 is provided at the center of the trap valve seat 17 and communicates with the outlet 6 via a check valve 20 described later. The hollow float 16 is arranged so as to face the end of the through hole 18 on the trap chamber 4 side.
When the condensate flows into the trap chamber 4, the float 16 rises and the through hole 18 is opened to discharge the condensate to the outlet 6 side.

A disk-shaped check valve 20 is attached in the passage of the outlet 6 substantially below the central axis of the bypass passage 7. A top end portion of the check valve 20 is supported by a rotating pin 21, and a check valve seat portion 22 is provided on the trap valve 4 side of the check valve 20. The check valve 20 allows the fluid to flow from the trap chamber 4 to the outlet 6 side by separating the check valve 20 from the check valve seat portion 22.
The check valve 20 is seated on the check valve seat portion 22 to prevent the flow of the fluid from the bypass flow path 7 and the outlet 6 to the trap chamber 4 side.

When a low temperature fluid such as condensate flows in from the inlet 5, the bimetal plate 9 contracts and the temperature responsive valve body 10 is pushed upward by the return coil spring 11 as shown in FIG. The bypass channel 7 is opened by separating from the member 12, and the inlet 5 and the outlet 6 are directly communicated with each other via the bypass channel 7. Therefore, most of the fluid flowing from the inlet 5 is discharged from the bypass passage 7 to the outlet 6 side before reaching the trap chamber 4. The fluid flowing down the bypass passage 7 collides with the check valve 20 below and reaches the outlet 6 side, so that the check valve 20 is reliably seated on the check valve seat portion 22 by its fluid force, No foreign matter such as dust or iron rust accumulated in the 6-side passage is allowed to flow back into the trap chamber 4.

When the temperature of the fluid such as condensate flowing from the inlet 5 rises and reaches a predetermined temperature, the bimetal plate 9 of the temperature responsive valve 8 expands and the temperature responsive valve body 10 is seated on the valve seat member 12. The bypass flow path 7 is closed. Therefore, all the fluid from the inlet 5 flows down into the trap chamber 4, and when the condensate reaches a predetermined water level, the hollow float 16 floats up and the through hole 18 is opened. Open valve 20 and exit 6
Run down to the side.

When the condensate in the trap chamber 4 is discharged to the outlet 6 side and the water level in the trap chamber 4 drops, the hollow float 16 also descends and closes the through hole 18 to close the condensate outlet. The discharge to the 6 side is stopped, and the discharge of steam, that is, leakage is also prevented.

[0016]

As described above, according to the present invention, the temperature responsive valve fulfills the bypass flow path function without requiring a driving source such as manpower or electricity, and the check valve leads to the trap chamber. A steam trap with a valve capable of preventing backflow of foreign matter can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a steam trap with valve of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid 4 Trap Valve Chamber 5 Inlet 6 Outlet 7 Bypass Flow Path 8 Temperature Responsive Valve 9 Bimetal Plate 10 Temperature Responsive Valve Body 12 Valve Seat Member 16 Hollow Float 17 Trap Valve Seat 18 Through Hole 20 Check Valve

Claims (1)

[Claims] 1. A flow path switching valve and a steam trap are integrally formed with a casing, an inlet, a trap chamber and an outlet are formed in the casing, and a steam trap is formed by switching the flow path switching valve. A temperature-responsive valve that can be switched as a flow path or a bypass flow path by forming a bypass flow path connecting the inlet and the outlet and opening the bypass flow path at the inlet side at low temperature and closing at high temperature And a check valve which allows only the flow of the fluid from the trap chamber to the outlet on the outlet side of the bypass flow passage.