JP2002122292A - Condensate discharging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a condensate discharging device with an improved back flow prevention capability of a check valve and an improved rolling capability of a rolling member. SOLUTION: An inlet 4, a valve chest 3 and an outlet 5 are formed on a valve casing consisting of an upper casing 1 and a lower casing 2. A valve seat member 8 having a lead out path 7 is threadedly connected to the lower casing 2. A temperature control element 10 opening and closing the lead out path 7 is retained above the valve seat member 8 with a snap ring 20. The lead out path 7 is comprised of a condensate discharging hole 21, an upstream orifice hole 22 having a smaller opening area than that of the condensate discharging hole 21, and an orifice hole 23 having a smaller opening area than that of the upstream orifice hole 22. The rolling member 25 is arranged to penetrate the orifice hole 23. An upper part of the rolling member 25 is mounted on an upper end of the orifice hole 23 and a lower part thereof is positioned below the orifice hole 23. The check valve element 27 as a float of hollow sphere made of stainless thin plate is welded to connect to the lower part of the rolling member 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a condensate discharge device for automatically discharging condensate generated in a steam piping system such as a steam transport pipe or a steam-using apparatus, and more particularly to a metal ion dissolved in a fluid. And the like can be prevented from accumulating on the surface of the condensate discharge hole and clogging, and can prevent backflow from the downstream side to the upstream side.

[0002]

2. Description of the Related Art A conventional condensate discharge device is disclosed in
This will be described with reference to the steam trap disclosed in Japanese Patent No. 6791. In this method, an orifice hole having an opening area smaller than that of the condensate discharge hole is formed downstream of the condensate discharge hole, and a rolling member partially positioned at the upper end of the orifice hole is disposed through the orifice hole. A check valve is provided on the rolling member to allow flow from the condensate discharge hole to the orifice hole and stop flow in the reverse direction. By maintaining the pressure of the condensate discharge hole at a high pressure close to the pressure on the upstream side and gently flowing the condensate down the condensate discharge hole, metal ions are prevented from adhering to the surface of the condensate discharge hole. The metal ions adhering to the surface of the orifice hole are removed by the rolling member. Further, when the fluid pressure on the downstream side becomes higher than that on the upstream side, the check valve prevents the backflow from the orifice hole to the condensate discharge hole.

[0003]

According to the above-mentioned structure, it is possible to prevent metal ions from adhering to the surface of the condensate discharge hole and to remove metal ions adhering to the surface of the orifice hole. Although it is an excellent thing that can prevent backflow from the hole to the condensate discharge hole, it is difficult to displace because the check valve body is heavy, delaying backflow prevention and hindering rolling of the rolling member There were problems. Accordingly, a technical problem of the present invention is to provide a condensate discharge device in which the check valve body has an increased backflow prevention capability and a higher rolling capability of a rolling member.

[0004]

Means for Solving the Problems The technical means of the present invention taken to solve the above technical problem is to provide an orifice hole having a smaller opening area than the condensate discharge hole downstream of the condensate discharge hole. A rolling member formed and partially positioned at the upper end of the orifice hole is arranged to penetrate the orifice hole, and allows a flow from an upstream side to a downstream side of the orifice hole below the rolling member to allow a flow in a reverse direction. And a check valve element for stopping the flow of water, and the check valve element is formed by a float.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As in the prior art, the present invention is to maintain the pressure of the condensate discharge hole at a high pressure close to the pressure on the upstream side, and to make the condensate flow slowly down the condensate discharge hole. The metal ions are prevented from adhering to the surface of the condensate discharge hole, and the metal ions adhering to the surface of the orifice hole are removed by the rolling member. Further, when the fluid pressure on the downstream side becomes higher than that on the upstream side, the check valve prevents the backflow from the downstream side of the orifice hole to the upstream side. Further, the check valve body formed of the float according to the present invention can be made light in weight, so that it is easily displaced, and the backflow can be prevented quickly. Further, since the check valve body is easily displaced, the rolling member is also easily rolled.

[0006]

An embodiment showing a specific example of the above technical means will be described (see FIG. 1). This embodiment is applied to a heat-responsive steam trap. The upper casing 1 and the lower casing 2 are screw-connected 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 an outlet 7 communicating 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.

A temperature control element 10 is arranged above the valve seat member 8. The temperature control element 10 includes a wall member 12 having an inlet 11, a plug member 13 for sealing the inlet 11, and a diaphragm 15 forming an accommodation chamber 14 between the wall member 12.
An expansion medium 16 sealed in the storage chamber 14, a valve member 17 fixed to the diaphragm 15, and a fixed wall member 1 fixed to the outer peripheral edge of the diaphragm 15 with the wall member 12 interposed therebetween.
8 is formed. The temperature control element 10 is held by a snap ring 20 fixed to the inner periphery of the lower casing 2, and the outer periphery of the lower surface of the fixed wall member 18 is a stepped portion of a plurality of ribs 19 formed on the inner periphery of the lower casing 2. Is hitting. 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 outlet path 7 of the valve seat member 8 includes a condensate discharge hole 21 and an upstream orifice hole 22 having an opening area smaller than that of the condensate discharge hole 21 which are sequentially formed from the valve chamber 3 side to the outlet 5 side.
And an orifice hole 23 having an opening area smaller than that of the upstream orifice hole 22. The orifice hole 23 is formed in an orifice member 24 which is press-fitted and fixed to the outlet passage 7.
The rolling member 25 is disposed through the orifice hole 23.
The rolling member 25 is formed by bending an elongated rod to form a circular portion having an outer shape larger than the orifice hole 23 on the upper side, and the circular portion rests on the upper end of the orifice hole 23. The rolling member 25 passes through the orifice hole 23, and the lower end is located below the orifice member 24. Under the rolling member 25, a check valve body 27 as a float made of a stainless steel thin plate and having a hollow spherical shape is welded and connected. Check valve body 27
When the fluid pressure on the outlet 5 side becomes higher than that on the inlet 4 side, it is displaced upward to close the lower end of the upper orifice hole 23. The shape of the check valve body 27 is not limited to the spherical shape described above, but may be a disk shape or the like. Further, the device may be arranged in a free state by providing a fall prevention member. The orifice member 24, the rolling member 25, and the check valve body 27 are each formed of stainless steel. Numeral 26 is a screen.

The operation of the above-mentioned thermo-responsive steam trap is as follows. When the fluid pressure on the inlet 4 side is higher than that on the outlet 5 side, the rolling member 25 and the check valve 27
Is displaced downward by the action of the fluid pressure on the
7 opens the lower end of the orifice hole 23. When the temperature of the fluid flowing into the valve chamber 3 from the inlet 4 is low, the expansion medium 16 contracts, the diaphragm 15 is displaced toward the wall member 12, and the valve member 17 is separated from the valve seat member 8 and led out. Road 7 is open. As a result, the condensate is discharged from outlet 7 to outlet 5
To be discharged. At this time, the condensate slowly flows down the condensate discharge hole 21 by the action of the upstream orifice hole 22 and the orifice hole 23. Similarly, the condensate flows down the upstream orifice hole 22 slowly by the action of the orifice hole 23. As a result, the metal ions dissolved in the condensate are condensed into the condensate discharge hole 2
1 and does not adhere to the surface of the upstream orifice hole 22. The condensate flows through the orifice hole 23 at high speed, and the metal ions adhere to the surface of the orifice hole 23. However, the rolling member 25 and the check valve body 27 roll due to the condensate flowing down. The metal ions adhering to the surface of 23 are removed by the rolling members 25 and do not accumulate. The metal ions flow off to the outlet 5 together with the condensate.

When steam flows into the valve chamber 3 due to the discharge of condensate, the expansion medium 16 expands and the diaphragm 15 expands.
Is displaced to the fixed wall member 18 side, and the valve member 17 is moved to the valve seat member 8.
And the outlet path 7 is closed. This prevents the outflow of steam. When the fluid pressure on the outlet 5 side becomes higher than that on the inlet 4 side, the rolling member 25 and the check valve body 27 are displaced upward by the action of the fluid pressure on the outlet 5 side, and the check member 27 is moved upward by the orifice. The lower end of the hole 23 is closed to prevent backflow.

In the above embodiment, a condensate discharge device applied to a thermally responsive steam trap has been exemplified. However, the present invention can be applied to other types of condensate discharge devices such as a float type, a disk type and an orifice type. It is.

[0012]

The present invention has the following specific effects. As described above, according to the present invention, the check valve body is formed of a float so as to be easily displaced, so that the check valve prevention capability of the check valve body can be enhanced and the rolling capability of the rolling member is enhanced. Can produce an excellent effect.

[Brief description of the drawings]

FIG. 1 is a sectional view of a condensate discharge device according to an embodiment of the present invention.

[Explanation of symbols]

 21 Condensate discharge hole 22 Upstream orifice hole 23 Orifice hole 25 Rolling member 27 Check valve

Claims (1)

[Claims] An orifice hole having an opening area smaller than that of the condensate discharge hole is formed downstream of the condensate discharge hole, and a rolling member partially positioned at the upper end of the orifice hole is passed through the orifice hole. A check valve body disposed below the rolling member to allow the flow from the upstream side to the downstream side of the orifice hole and stop the flow in the reverse direction, and the check valve body is formed by a float. Water drainage device.