JPH0842792A - Steam trap - Google Patents

Abstract

PURPOSE:To attain steam trap whereby no metal ion is precipitated on a surface of a valve port. CONSTITUTION:A valve chamber 4, an inlet 6 and an outlet 8 are formed of a valve casing made up of a main body 1 and a cover member 2. The main body 1 and the cover member 2 are each made of FC 25. A valve seat member 9 having a valve port 7 is installed on a lower side wall of the main body 1 by screwing. The valve seat member 9 is made of SUS420F, and integrated with the main body 1. A hollow and spherical float 11 as a valve member is housed in a valve chamber in a free state. The inlet 6 is connected by screwing to an upstream side piping 13 made of steel pipe. Sealing tape is wound around the screwing part for keeping airtightness. A grounding terminal 15 is provided on the main body. A current carrying passage grounded through a lead wire is formed. Electric charge of the valve seat member forming the valve port 7 is discharged to the ground. A grounding terminal 17 is formed on the upstream side piping, and a current carrying passage grounded through a lead wire 18 is formed. Electric charge of the upstream side piping is discharged to the ground.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam trap for automatically discharging condensate generated in steam-using equipment and steam pipes, 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 that utilizes the difference in specific gravity between steam and condensate, a thermodynamic type that utilizes the difference in thermodynamic characteristics between steam and condensate, and a steam trap, depending on the driving principle of the valve member. Using the temperature difference between water 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 ferrous 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. Again
When the valve mouth is formed by a singing, 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, between the valve casing and the ground and between the upstream pipe and the ground. It is characterized in that the valve casing and the upstream pipe are directly grounded by providing an electric current path to the.

[0006]

The operation of the above technical means is as follows.
Since a current path is provided between the valve casing and the ground and between the upstream pipe and the ground to directly ground the valve casing and the upstream pipe, respectively, the valve casing or valve casing where the valve port is formed is formed. The valve seat member integrally attached to the sing and the upstream pipe can be equipotential, and metal ions dissolved in the fluid are not deposited on the valve port surface. The metal ions flow out to the outlet together with the discharged condensate.

[0007]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). This embodiment is applied to a free-float steam trap. Main body 1 and lid member 2
Are fastened with bolts 3 to form a valve casing having a valve chamber 4 inside. A gasket 5 is provided between the main body 1 and the lid member 2.
Keep airtight between them. An inlet 6 communicating with the valve chamber 4 is formed in the upper portion of the main body 1. An outlet 8 communicating with the valve chamber 4 via a valve opening 7 described below is formed in the lower portion of the main body 1. The inlet 6 and the outlet 8 are horizontally opened, and each form an internal thread for pipe connection. Both the main body 1 and the lid member 2 are formed of FC25.

A valve seat member 9 having a valve opening 7 is attached to the lower side wall of the main body 1 by screwing. The main body 1 and the valve seat member 9 are integrated, and the airtightness between them is maintained by the gasket 10. The valve seat member 9 is made of 13 chrome steel, specifically SUS42.
Form at 0F. A float 11 as a valve member, which is formed of a thin plate of SUS316L and has a hollow spherical shape, is accommodated in the valve chamber 4 in a free state. The float 11 floats on the condensate accumulated in the valve chamber 4 and floats down along with the liquid surface to open and close the valve port 7. Valve chamber 4
Two float seats 12 are provided on the bottom surface of the valve substantially parallel to the axis of the valve opening 7 on the front side and the opposite side of the paper surface.
Holds 1.

The inlet 6 is screwed to an upstream pipe 13 formed of a copper pipe. A thread tape is wrapped around the thread to maintain airtightness between the two. A downstream pipe 14 is screwed to the outlet 8. A thread tape is wrapped around the thread to maintain airtightness between the two.

A ground terminal 15 is provided on the main body 1 and the lead wire 1
An energization path grounded by 6 is formed, and the electric charge of the valve seat member 9 forming the valve opening 7 is made to flow to the ground. The upstream pipe 13 is provided with a grounding terminal 17, and a lead wire 18 forms an energization path to be grounded to the ground so that the electric charge of the upstream pipe 13 flows to the ground.

The operation of the free-float steam trap is as follows. The steam and the condensate in the upstream pipe 13 flow into the valve chamber 4 from the inlet 6, and the condensate is separated into the lower part and the steam is separated into the upper part and accumulated. The condensate causes the float 11 to rise and the valve opening 7
Open and discharge the condensate to the outlet 8. When the liquid level drops due to the discharge of condensed water, the float 11 descends to close the valve port 7 and prevent the outflow of steam.

In the prior art, the copper ions dissolved from the upstream pipe 13 formed of a copper pipe were deposited on the surface of the open end of the valve opening 7 on the valve chamber 4 side (at the reference numeral A). In this embodiment, since the main body 1 and the upstream pipe 13 are directly grounded by the lead wires 16 and 18, respectively, the valve seat member 9 integrated with the main body 1 and the upstream pipe 13 can be made to have the same electric potential. Ions do not deposit on the surface of the valve opening 7.

Another embodiment showing a concrete example of the above technical means will be described (see FIG. 2). The present embodiment is applied to a disc type steam trap. A lid member 22 is screwed to the main body 21 to form a valve casing having a valve chamber 23 therein. An inlet 24 and an outlet 25 are coaxially formed in the lower portion of the main body 21. Each of the inlet 24 and the outlet 25 is formed with a female screw for connecting a pipe. An inlet hole 26 is opened at the center of the main body 21 on the valve chamber 23 side so that the inlet 24 and the valve chamber 23 can communicate with each other. An annular groove 27 is provided on the outer periphery of the inflow hole 26, and an inner ring valve seat 28 is provided between the inflow hole 26 and the annular groove 27.
An outer ring valve seat 29, which is concentric with the inner ring valve seat 28 and is flush with the inner ring valve seat 28, is provided around the outer periphery of the valve 7, and a valve opening 30 is opened from a part of the annular groove 27 so that the valve chamber 23 can communicate with the outlet 25. Body 21 is 13
Chrome steel Specifically, it is made of SCS2A, and the lid member 22 is made of SUS420J2.

In the valve chamber 23, a disk-shaped valve disc 31 made of SUS420J2 is arranged in a free state. The screen 32 for capturing dust in the fluid is provided with the inlet 24 and the inflow hole 2
6 and is fixed to the main body 21 with a plug 33 screwed. A gasket 3 is provided between the body 21 and the plug 33.
4 is interposed to keep the airtightness between them. Valve disc 31
The inner and outer ring valve seats 28, 29 depending on the pressure change in the valve chamber 23.
The operator sits on the seat and opens and closes the valve opening 30.

The inlet 24 is screwed to an upstream pipe 35 made of a copper pipe. A thread tape is wrapped around the thread to maintain airtightness between the two. A downstream pipe 36 is screwed to the outlet 25. A thread tape is wrapped around the thread to maintain airtightness between the two.

A grounding terminal 37 is provided on the main body 21, and a lead wire 38 forms an energizing path for grounding to the ground.
The electric charge of the main body 21 forming the electric field is made to flow to the ground. A grounding terminal 39 is provided on the upstream pipe 35, and a lead wire 40 forms an energization path to be grounded to the ground so that the electric charge of the upstream pipe 35 flows to the ground.

The operation of the disc type steam trap is as follows. When steam does not stay in the valve chamber 23, the pressure of the condensed water flowing from the inlet 24 is
By acting in the valve opening direction of the valve disc 31 via 6, the valve disc 31 is separated from the inner and outer ring valve seats 28 and 29 to open the valve port 30, and the condensate is discharged to the outlet 25. Once the condensate discharge is complete and steam begins to flow in through the inlet 24,
The steam immediately fills the valve chamber 23, and the lower surface of the valve disk 31 flows down at a high speed, causing the lower surface of the valve disk 31 to decrease in static pressure, and the valve disk 31 is seated on the inner and outer ring valve seats 28 and 29. The valve opening 30 is closed by the valve to prevent the steam from flowing out. When the pressure of the steam staying in the valve chamber 23 decreases due to heat radiation or the like, the force for pressing the valve disc 31 against the inner and outer ring valve seats 28, 29 also decreases, and the valve opening force acting from the inflow hole 26 is lower than the force. When lowered, the valve disc 31 opens.

In the conventional case, the copper ions dissolved from the upstream pipe 35 formed of the copper pipe are the annular groove 2 of the valve port 30.
It was deposited on the surface of the opening end on the 7 side (the place of reference numeral B). In this embodiment, since the main body 21 and the upstream pipe 35 are directly grounded by the lead wires 38 and 40, respectively, the main body 21 and the upstream pipe 35 can be equipotential, and copper ions can be deposited on the surface of the valve port 30. There is no.

Although the free-float type steam trap and the disc type steam trap have been exemplified in the above embodiment,
The present invention is applicable to other types of steam traps.

[0020]

The present invention produces the following unique 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. In addition, the electrification path between the valve casing and the ground prevents electrification of the valve casing in which the valve opening is formed or the valve seat member integrally attached to the valve casing. It is also possible to prevent fine dust from adhering to, and this also makes it possible to maintain the original function of the steam trap for a long period of time.

[Brief description of drawings]

FIG. 1 is a sectional view of a free-float type steam trap of an embodiment of the steam trap of the present invention.

FIG. 2 is a sectional view of a disk type steam trap of another embodiment of the steam trap of the present invention.

[Explanation of symbols]

 1, 21 Main body 2, 22 Lid member 4, 23 Valve chamber 6, 24 Inlet 7, 30 Valve opening 8, 25 Outlet 9 Valve seat member 11 Float 13, 35 Upstream piping 15, 17, 37, 39 Grounding terminal 16 , 18, 38, 40 Lead wire 31 valve disc

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, the electric current paths are provided between the valve casing and the ground and between the upstream pipe and the ground so that the valve casing and the upstream pipe are directly grounded. Characteristic steam trap.