JP3686149B2 - Steam trap - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a steam trap that automatically discharges condensate generated in steam-using equipment and steam piping, and in particular, metal ions dissolved in a fluid are deposited on the surface of a valve port and become clogged. It relates to what was prevented.
[0002]
[Prior art]
The steam trap is a mechanical type that uses the specific gravity difference of steam and condensate, a thermodynamic type that uses the difference in thermodynamic characteristics of steam and condensate, and the temperature of steam and condensate, depending on the driving principle of the valve member. Although it is classified as a thermostatic type that utilizes the difference, the basic configuration is that the valve casing is formed with an inlet, a valve chamber, and an outlet, and is attached to the valve casing or valve casing. In addition to forming a valve port that connects the valve chamber and the outlet to the member, the valve member is arranged in the valve chamber, and the condensate flowing through the upstream pipe connected to the inlet is automatically opened and closed by the valve member. To be discharged at the exit. 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 made of stainless steel in consideration of wear resistance. In addition, when the valve opening is formed by valve casing or when the valve casing is small, the valve casing is usually formed of stainless steel.
[0003]
[Problems to be solved by the invention]
The steam trap has a problem that metal ions dissolved in the fluid and flowing into the valve chamber are deposited on the surface of the valve port and block the valve port. 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 port formed of stainless steel. This is because the metal ion is deposited on the surface of the valve port due to the potential difference generated between the upstream pipe and the member forming the valve port, and the valve port has a considerably smaller area than the cross-sectional area of the pipe to which it is attached. For this reason, it is blocked immediately.
[0004]
Therefore, the technical problem of the present invention is to provide a steam trap in which metal ions do not deposit on the valve mouth surface.
[0005]
[Means for solving the problems]
The technical means of the present invention taken to solve the above technical problems include valve casing, inlet and valve chamber and outlet formed in the valve casing, and valve casing or valve casing. comprising a valve port for communicating the valve seat formed valve chamber and the outlet member integrally attached to the single, and a valve member disposed in the valve chamber, connecting the incoming mouth through the sealing tape to the 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, it is formed by a lead wire between the valve casing and the upstream pipe is characterized in that is electrically conductive to provide a through path.
[0006]
[Form of the present invention]
In the present invention, a current passage is provided between the valve casing and the upstream pipe so as to be electrically connected. 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 equipotential, and metal ions dissolved in the fluid can be It does not deposit on the surface. Metal ions flow to the outlet with the discharged condensate.
[0007]
【Example】
An embodiment showing a specific example of the above technical means will be described (see FIG. 1).
This embodiment is applied to a thermally responsive steam trap.
The upper casing 1 and the lower casing 2 are screwed together to form a valve casing having a valve chamber 3 therein. An inlet 4 is formed in the upper casing 1 and an outlet 5 is formed in the lower casing 2. The inlet 4 and the outlet 5 are formed coaxially. A valve seat member 8 having a valve port 7 communicating with the valve chamber 3 and the outlet 5 is screwed to the transverse wall 6 of the lower casing 2. The upper casing 1, the lower casing 2, and the valve seat member 8 are each formed of stainless steel.
[0008]
A temperature control element 10 is located above the valve seat member 8. The temperature control element 10 is sealed in the housing chamber 14, a wall member 12 having an inlet 11, a plug member 13 that seals the inlet 11, a diaphragm 15 that forms a housing chamber 14 between the wall member 12, and the housing chamber 14. The expansion medium 16 includes a valve member 17 fixed to the diaphragm 15, and a fixed wall member 18 fixed with the outer peripheral edge of the diaphragm 15 sandwiched between the wall member 12. The valve member 17 is separated from the valve seat member 8 to form a valve portion that opens and closes the valve port 7. 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 outer periphery of the lower surface of the fixing wall member 18 is a rib of the lower casing 2. It hits 19 steps. Both the temperature control element 10 and the snap ring 20 are made of stainless steel. The expansion medium 16 is formed of water, a liquid having a lower boiling point than water, or a mixture thereof.
[0009]
The inlet 4 is connected to an upstream pipe 22 formed of a copper pipe through a copper alloy joint 21. A seal tape is wound around the screw portion 23 between the inlet 4 and the joint 21 to maintain 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 seal tape is wound around a threaded portion with the joint 24 to maintain airtightness.
[0010]
The upper casing 1 and the upstream pipe 22 are respectively provided with ground terminals 27 and 28, and a conducting path is formed by the lead wire 29, so that the valve seat member 8 forming the valve port 7 and the upstream pipe 22 are electrically connected. Conducted.
[0011]
The operation of the thermally responsive steam trap is as follows.
When the temperature of the fluid flowing into the valve chamber 3 from the inlet 4 through the upstream pipe 22 is low, the expansion medium 16 contracts, the diaphragm 15 is displaced toward the wall member 12, and the valve member 17 is moved to the valve seat member 8. The valve port 7 is opened away from the seat. Thereby, the condensate is discharged to the outlet 5. When steam flows into the valve chamber 3 due to the discharge of the condensate, the expansion medium 16 expands, the diaphragm 15 displaces to the fixed wall member 18 side, and the valve member 17 sits on the valve seat member 8 to cause the valve. Close the mouth 7. Thereby, the outflow of steam is prevented.
[0012]
In the prior art, copper ions dissolved from the upstream pipe 22 formed of a copper pipe were deposited at the valve chamber 4 side opening end of the valve port 7. In this embodiment, since the upper casing 1 and the upstream pipe 22 are connected by the lead wire 29, the valve seat member 8 and the upstream pipe connected to the upper casing 1 through the lower casing 2 are connected. 22 can be made equipotential, and copper ions are not deposited on the surface of the valve port 7.
[0013]
In the above embodiment, a thermally responsive steam trap is illustrated, but the present invention can be applied to other types of steam traps such as a float type and a disk type.
[0014]
【The invention's effect】
The present invention produces the following specific effects.
As described above, according to the present invention, since metal ions do not deposit on the valve mouth surface, the discharge flow rate is not reduced and the valve mouth is not blocked, and the original function of the steam trap can be maintained for a long time. Can be maintained across.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a thermally responsive steam trap according to an embodiment of a 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 Members 21 and 24 Joint 22 Upstream Pipe 25 Downstream Pipe 27 and 28 Ground terminal 29 Lead wire

Claims (1)

Valve casing, valve inlet and valve chamber and outlet formed in valve casing, valve casing or valve seat member integrally attached to valve casing and connecting valve chamber and outlet automatic and mouth, comprising a valve member disposed in the valve chamber, connecting the incoming mouth through the sealing tape upstream pipe condensate flowing upstream pipe by opening and closing the valve port in the valve member in Mutorappu, Benke - - steel which to be discharged to the outlet Li between the single and the upstream pipe - provided through path formed by the lead wire, characterized in that is electrically conductive steel - Mutorappu.

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