JPH08247391A - Thermal reaction type steam trap - Google Patents

Abstract

PURPOSE: To provide a thermal reaction type steam trap which is suitable for a large quantity and can discharge a large quantity of condensate. CONSTITUTION: A valve casing having a valve chamber 3 in its inside is formed of a main body 1 and an end member 2. An inlet 4 and an outlet 5 are formed in the valve casing. The inlet 4 communicates with the valve chamber 3 through flow-in passages 6, 7. The valve chamber communicates with the outlet 5 through the first leading out passage 8 provided in the first valve seat member 9 and the second leading out passage 10 provided in the second valve seat member 11. A temperature control element 12 is arranged between the first and the second valve seat member. The temperature control element 12 is composed by enclosing the first expansive medium 16 between one face of a partitioning wall member 14 and the first diaphragm 15 and the second expansive medium 18 which expands and contracts at temperature lower than the first expansive medium between the other face of the partitioning wall member and the second diaphragm 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a temperature control element that includes a medium that is heated and cooled by steam and condensate and expands and contracts according to the temperature of the condensate. The present invention relates to a heat-actuated steam trap that automatically discharges water, and particularly to a heat-actuated steam trap that can discharge a large amount of condensed water.

[0002]

2. Description of the Related Art The basic structure of a heat-actuated steam trap is known, for example, from Japanese Patent Publication No. 60-46318. As understood from the publication, a temperature control element in which an expansion medium is enclosed between a wall member and a diaphragm is arranged in a valve chamber communicating with an inlet, and the valve chamber is displaced by the displacement of the diaphragm due to expansion and contraction of the expansion medium. The lead-out path that communicates with the outlet is opened and closed.

When a high temperature fluid having a temperature higher than a predetermined temperature flows into the valve chamber, the expansion medium expands and the internal pressure increases, and the diaphragm is displaced in the valve closing direction to close the outlet passage. This prevents the discharge of steam. When a low temperature fluid below a predetermined temperature flows in, the expansion medium contracts and the internal pressure decreases,
The diaphragm is displaced in the valve opening direction to open the lead-out path.
As a result, condensed water and air are discharged outside the system.

[0004]

However, in the heat-actuated steam trap of this type, the discharge capacity is small because the temperature control element only opens and closes a single lead-out path. There was a problem that it was not suitable for discharging a large amount of condensate.

Therefore, a technical problem of the present invention is to provide a heat-actuated steam trap for a large amount capable of discharging a large amount of condensed water.

[0006]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems are an inlet by valve casing, a valve chamber communicating with the inlet, a first and a second. An outlet communicating with the valve chamber via the two outlets of the partition wall member to enclose the first expansion medium between the one surface of the partition wall member and the first diaphragm, and between the other surface of the partition wall member and the second diaphragm. A temperature control element enclosing a second expansion medium that expands and contracts at a temperature lower than that of the first expansion medium is disposed between the two outlet paths, and the displacement of both diaphragms due to expansion and contraction of both expansion media causes It is a heat-actuated steam trap that opens and closes two outlets.

[0007]

The operation of the above technical means is as follows.
When the temperature of the fluid flowing into the valve chamber rises, first, the second expansion medium that expands and contracts at a low temperature expands, and the second diaphragm displaces in the direction of the opposing second discharge path and closes the second discharge path. To do. Subsequently, the first expansion medium expands, and the first diaphragm is displaced in the direction of the facing first lead-out path to close the first lead-out path. When the temperature of the fluid flowing into the valve chamber becomes low, the first expansion medium that expands and contracts at high temperature first contracts, and the first outlet passage facing the first diaphragm is closed. Subsequently, the second expansion medium contracts and closes the second lead-out path facing the second diaphragm. In this way, since the two outlet paths are opened and closed by the temperature control element, the discharge capacity can be increased and a large amount of condensed water can be discharged. Further, since the two outlet paths are not opened and closed at the same time, there is no danger of causing a water hammer due to the rapid flow of fluid accompanying the on-off valve.

[0008]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). The main body 1 and the end member 2 are connected with a bolt (not shown) to form a valve casing having a valve chamber 3 inside. An inlet 4 is formed in the end member 2, and the body 1
An inlet 5 is formed coaxially with the inlet 4. Entrance 4
Communicate with the valve chamber 3 through inflow passages 6 and 7 formed in the main body 1.

A first valve seat member 9 having a first lead-out passage 8 and a second valve seat member 11 having a second lead-out passage 10 are coaxially arranged in a partition wall between the valve chamber 3 and the outlet 5. It is screwed. The valve chamber 3 communicates with the outlet 5 from the first and second outlet passages 8 and 10 through the outside of the partition wall.

A temperature control element 12 is arranged between the first valve seat member 9 and the second valve seat member 11 and is held by a spring 13. The temperature control element 12 encloses the first expansion medium 16 in the internal space formed by fixing the outer peripheral edge of the first diaphragm 15 to the outer peripheral edge of one surface of the partition wall member 14, and
The second diaphragm 17 is provided on the outer peripheral edge of the other surface of the partition wall member 14.
The second expansion medium 18 is enclosed in the internal space formed by fixing the outer peripheral edges of the above. The first expansion medium 16 is water,
The second expansion medium 18 is formed of a liquid having a boiling point lower than that of water, or a mixture thereof, and the second expansion medium 18 is a liquid having a boiling point lower than that of water, a mixture thereof, or a mixture of water and a liquid having a boiling point lower than water. The boiling point is lower than 16. The first and second diaphragms 15 and 17 have valve members 19 and 2 for opening and closing the lead-out passages 8 and 10 at their centers, respectively.
0 is stuck. Also, the first and second diaphragms 1
The outer peripheral edges of the fixed wall members 21 and 22 each having an opening through which the valve members 19 and 20 come in and out are fixed to the outer peripheral edges of the reference numerals 5 and 17.

When the temperature of the fluid flowing into the valve chamber 3 rises, the second expansion medium 18 first expands, and the second diaphragm 17 is displaced toward the opposing second valve seat 11 side.
The valve member 20 closes the second outlet passage 10. Subsequently, the first expansion medium 16 expands, the first diaphragm 15 is displaced toward the opposing first valve seat 9 side, and the valve member 19 closes the first outlet passage 8. When the temperature of the fluid flowing into the valve chamber becomes low, the first expansion medium 16 first contracts, the first diaphragm 15 is displaced, and the valve member 19 opens the first outlet passage 8. Subsequently, the second expansion medium 18 expands, the second diaphragm 17 is displaced, and the valve member 20 opens the second outlet passage 10.

[0012]

The present invention produces the following unique effects. As described above, according to the present invention, since the two outlet passages can be opened and closed by the temperature control element, a large amount of condensed water can be discharged, and a large amount of heat-responsive steam trap can be provided.
In addition, since the two temperature control elements can open and close the two outlets in sequence, it is possible to prevent the rapid flow of fluid associated with the on-off valve, and to provide a thermally responsive steam trap that does not cause water hammer. Can be provided.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a heat-actuated steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 1 Main Body 2 End Member 3 Valve Chamber 4 Inlet 5 Outlet 8 First Outlet Path 10 Second Outlet Path 12 Temperature Control Element 14 Partition Wall Member 15 First Diaphragm 16 First Expansion Medium 17 Second Diaphragm 18 Second Expansion Medium

Claims (1)

[Claims] 1. A valve casing forms an inlet, a valve chamber communicating with the inlet, and an outlet communicating with the valve chamber through two first and second outlet passages, and the one surface of the partition wall member. A temperature control element in which a first expansion medium is enclosed between the first diaphragm and a second expansion medium which expands and contracts at a lower temperature than the first expansion medium is enclosed between the other surface of the partition wall member and the second diaphragm. Is disposed between the two lead-out passages, and the two lead-out passages are opened and closed by displacement of both diaphragms due to expansion and contraction of both expansion media.