JPH09166287A - Steam trap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steam trap without deposition of a metal ion in a valve port surface. SOLUTION: An inlet 4, valve chamber 3 and an outlet 5 are formed in a valve casing comprising upper/lower casings 1, 2. A valve seat member 8 opening a valve port 7 is screw-connected to the lower casing. The valve casing and the valve seat member are formed of stainless steel. A temperature control element 10 opening/closing the valve port is held by a snap ring 20 in the upward of the valve seat member. The temperature control element and the snap ring are formed of stainless steel. The inlet is connected to an upstream pipe 22 formed by a copper pipe through a copper alloy-made joint 21. A seal tape is wound to a screw part 23 between the inlet and the joint, so as to hold air- tightness. Earth terminals 27, 28 are respectively provided in the upper casing and the upstream pipe, a current carrying path is formed by a lead wire 29, and the valve seat member and the upstream pipe are electrically conducted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap that automatically discharges condensate generated in equipment using steam or steam piping, and in particular, metal ions dissolved in a fluid are deposited on the surface of a valve opening. It is related to the thing which prevented it from being blocked.

[0002]

2. Description of the Related Art A steam trap is a mechanical type using a difference in specific gravity between steam and condensate, a thermodynamic type using a difference in thermodynamic characteristics between steam and condensate, and a steam, depending on the driving principle of a valve member. Using the temperature difference between condensate and condensate
Although it is classified into the most static type etc., the basic structure is to form an inlet, a valve chamber and an outlet in the valve casing, and a valve casing or an outlet in a valve seat member attached to the valve casing. A valve member is formed in the valve chamber, and a valve member is arranged in the valve chamber, and the valve member is opened and closed to automatically discharge the condensate flowing through the upstream pipe connected to the inlet to the outlet. Is. The material of the valve casing is usually an iron-based metal such as cast iron or cast steel, and the valve seat member forming the valve port is usually formed of stainless steel in consideration of wear resistance. Again
When the valve mouth is formed by a singing or the valve casing is small, the valve casing is usually formed of stainless steel.

[0003]

In the steam trap, there is a problem that the metal ions dissolved in the fluid and flowing into the valve chamber are deposited on the surface of the valve opening and block the valve opening. For example, when the upstream pipe is formed of a copper pipe, copper ions dissolved from the copper pipe are deposited on the surface of the valve opening formed of stainless steel. This is because the potential difference between the upstream pipe and the member forming the valve mouth causes metal ions to be deposited on the surface of the valve mouth, and the valve mouth has a considerably smaller area than the cross-sectional area of the pipe to be attached. Therefore, it will be blocked immediately.

Therefore, a technical object of the present invention is to provide a steam trap in which metal ions are not deposited on the surface of the valve opening.

[0005]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above technical problems is a valve casing and an inlet, a valve chamber and an outlet formed in the valve casing. ,
The valve casing is provided with a valve opening formed in a valve seat member integrally attached to the valve casing or communicating with the valve chamber and an outlet, and a valve member arranged in the valve chamber, and the inlet is connected to an upstream pipe. In the steam trap that automatically discharges the condensate flowing in the upstream pipe to the outlet by opening and closing the valve port with the valve member, an electric circuit is provided between the valve casing and the upstream pipe. The feature is that they are electrically connected.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is one in which an electric conduction path is provided between a valve casing and an upstream pipe to electrically connect them. Therefore, the valve casing in which the valve opening is formed or the valve seat member integrally attached to the valve casing and the upstream pipe can be made to have the same potential, and the metal ions dissolved in the fluid are It does not deposit on the surface. The metal ions flow to the outlet together with the discharge condensate.

[0007]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a thermo-responsive steam trap. Upper case 1 and lower case
A valve casing having a valve chamber 3 therein is formed by screwing the thing 2 with a screw 2. The upper case 1 has an inlet 4 and the lower case 2 has an outlet 5. The inlet 4 and the outlet 5 are formed coaxially. On the transverse wall 6 of the lower casing 2,
A valve seat member 8 having a valve opening 7 that connects the valve chamber 3 and the outlet 5 is screwed. The upper casing 1, the lower casing 2, and the valve seat member 8 are each formed of stainless steel.

A temperature control element 10 is located above the valve seat member 8. The temperature control element 10 includes a wall member 12 having an inlet 11, a plug member 13 sealing the inlet 11, and a wall member 1.
A diaphragm 15 that forms a storage chamber 14 between the diaphragm 15 and
The expansion medium 16 sealed in the accommodation chamber 14 and the diaphragm 1
The valve member 17 fixed to the valve member 5 and the fixed wall member 18 fixed to the wall member 12 with the outer peripheral edge of the diaphragm 15 sandwiched therebetween. The valve member 17 is seated on and off the valve seat member 8 and
It forms the valve part that opens and closes. The temperature control element 10 is held by a snap ring 20 fixed to a plurality of ribs 19 formed on the inner periphery of the lower casing 2, and the fixed wall member 1 is fixed.
The outer periphery of the lower surface of 8 contacts the step portion of the rib 19 of the lower casing 2. Both the temperature control element 10 and the snap ring 20 are formed of stainless steel. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.

The inlet 4 is connected to an upstream pipe 22 formed of a copper pipe through a joint 21 made of copper alloy. Inlet 4 and fitting 2
A seal tape is wound around the threaded portion 23 between the two to keep airtightness. Similarly, the outlet 5 is connected to a downstream pipe 25 formed of a copper pipe through a copper alloy joint 24, and a threaded portion with the joint 24 is sealed with a seal tape to keep airtightness.

The upper casing 1 and the upstream pipe 22 are provided with grounding terminals 27 and 28, respectively, and the lead wire 29 forms an energization path, so that the valve seat member 8 forming the valve port 7 and the upstream pipe 22 are connected to each other. It is electrically conducted.

The operation of the heat-actuated steam trap is as follows. The valve chamber 3 from the inlet 4 through the upstream pipe 22
When the temperature of the fluid flowing in is low, the expansion medium 16 contracts, the diaphragm 15 is displaced to the wall member 12 side, the valve member 17 separates from the valve seat member 8, and the valve port 7 is opened. There is. Thereby, the condensate is discharged to the outlet 5. When steam flows into the valve chamber 3 due to the discharge of condensed water, the expansion medium 1
6 expands, the diaphragm 15 is displaced toward the fixed wall member 18, and the valve member 17 is seated on the valve seat member 8 to close the valve port 7. This prevents the outflow of steam.

In the prior art, the copper ions dissolved from the upstream pipe 22 formed of a copper pipe were deposited at the open end of the valve port 7 on the valve chamber 4 side. In this embodiment, since the upper casing 1 and the upstream pipe 22 are electrically connected by the lead wire 29, the valve seat member 8 and the upstream pipe which are electrically connected to the upper casing 1 via the lower casing 2 are connected. 22 and 22 can be made equipotential, and copper ions will not be deposited on the surface of the valve opening 7.

Although the heat-actuated steam trap is exemplified in the above embodiment, the present invention can be applied to other types of steam traps such as a float type and a disc type.

[0014]

The present invention has the following specific effects. As described above, according to the present invention, since metal ions are not deposited on the surface of the valve opening, the discharge flow rate is not reduced and the valve opening is not blocked, and the original function of the steam trap is maintained for a long time. Can be maintained across.

[Brief description of the drawings]

FIG. 1 is a sectional view of a thermally responsive steam trap according to an embodiment of the steam trap of the present invention.

[Explanation of symbols]

 1 Upper Case 2 Lower Case 3 Valve Chamber 4 Inlet 5 Outlet 7 Valve Port 8 Valve Seat Member 10 Temperature Control Element 15 Diaphragm 16 Expansion Medium 17 Valve Member 21, 24 Joint 22 Upstream Pipe 25 Downstream Pipe 27, 28 Ground terminal 29 Lead wire

Claims (1)

[Claims] 1. A valve casing, an inlet, a valve chamber and an outlet formed in the valve casing, and a valve casing or a valve chamber formed in a valve seat member integrally attached to the valve casing. It has a valve opening communicating with the outlet and a valve member arranged in the valve chamber. By connecting the inlet to the upstream piping and opening and closing the valve opening with the valve member, the condensate flowing through the upstream piping is automatically In the steam trap that discharges to the outlet, a steam trap characterized in that a current path is provided between the valve casing and the upstream pipe to electrically conduct the steam trap.