JPH0886396A - Thermally-actuated steam trap - Google Patents

Abstract

PURPOSE: To provide a thermally-actuated steam trap which can exhaust condensate ranging from small quantity to large quantity without producing steam leakage. CONSTITUTION: A valve casing in which a valve chamber 4 is provided is formed with a main body 1 and a cover member 2. An inlet 5 interconnected to the valve chamber and an outlet 6 interconnected to the valve chamber through an outlet pipe 7 are formed coaxially on the valve casing. Also a first valve seat member 9 in which a first lead-through path 8 is opened in an outlet pipe, second valve seat member 11 in which a second lead-through path 10 is opened in it, and a third valve seat member 13 in which a third lead-through member 13 is opened in it are screw-connected to the outlet pipe. Then a first temperature control machine element 14 to open and close the first lead-through path 8, a second temperature control machine element 15 to open and close the second lead-through path 10, and a third temperature control machine element 16 to open and close the third lead-through path 12 are arranged in the valve chamber, and the expansion and contraction temperatures of an expansion medium sealed into these temperature control machine elements are differentiated from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermo-responsive type that automatically discharges condensate generated in various steam-using devices and steam pipes by using a temperature control element containing an expansion medium that expands and contracts at a predetermined temperature. Concerning the steam trap, a heat-actuated steam system that is particularly suitable for use in locations where the amount of condensate generated fluctuates from a small amount to a large amount.
Regarding the mutrap.

[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 in an internal space between a wall member and a diaphragm is arranged in a valve chamber communicating with the inlet, and the diaphragm is displaced by the expansion and contraction of the expansion medium. The outlet passage that connects the valve chamber and the outlet is opened and closed.

When the temperature inside the valve chamber rises above a predetermined temperature, the expansion medium expands and the internal pressure in the internal space increases, and the diaphragm is displaced in the valve closing direction to close the outlet passage. This prevents the discharge of steam. When the temperature becomes lower than the predetermined temperature, the expansion medium contracts and the internal pressure in the internal space decreases, and the diaphragm is displaced in the valve opening direction to open the outlet passage. As a result, condensed water and air are discharged outside the system.

[0004]

However, in the heat-actuated steam trap of this type, since only a single temperature control element is used to open and close a single outlet, the discharge capacity is reduced. However, there was a problem that it was not suitable for discharging a large amount of condensate due to its small size.

In order to solve this problem, the derivation path is enlarged and a large temperature control element capable of opening and closing this large derivation path is used, or a plurality of derivation paths are formed and each derivation path is opened and closed. A large amount of condensate can be discharged by using a plurality of temperature control elements. However, in this case, even when the amount of generated condensate is small, a large outlet path or a plurality of outlet paths can be opened at the same time, so that vapor leakage will occur due to the valve closing delay.

[0006] Therefore, a technical problem of the present invention is to provide a heat-actuated steam trap capable of discharging a small amount to a large amount of condensed water without causing steam leakage.

[0007]

[Means for Solving the Problems] The technical means of the present invention taken to solve the above-mentioned technical problem is to provide an inlet through valve casing, a valve chamber communicating with the inlet, and an outlet passage. A temperature control element that forms an outlet communicating with the valve chamber and encloses an expansion medium in the internal space between the wall member and the diaphragm is placed inside the valve chamber, and the outlet path is opened and closed by the displacement of the diaphragm caused by the expansion and contraction of the expansion medium. In a thermally actuated steam trap, a plurality of temperature control elements that form a plurality of discharge paths and open and close each of the discharge paths are arranged in the valve chamber, and the expansion and contraction of the expansion medium enclosed in each temperature control element. It is characterized by being formed at different temperatures.

[0008]

The operation of the above technical means is as follows.
Since a plurality of temperature control elements for forming a plurality of discharge paths and opening and closing each of the discharge paths are arranged in the valve chamber, and the expansion and contraction temperatures of the expansion medium of each temperature control element are made different, it is formed. As the temperature in the valve chamber decreases, the corresponding outlet path is sequentially opened from the temperature control element having the expansion medium that expands and contracts at a high temperature. Further, as the temperature in the valve chamber rises, the corresponding outlet passages are sequentially closed from the temperature control element having the expansion medium that expands and contracts at a low temperature. In this way, since a plurality of temperature control elements sequentially open and close the outlet passage according to the temperature in the valve chamber, when the amount of generated condensate is small and the temperature in the valve chamber is small, the expansion medium expands and contracts at the highest temperature. Only the temperature control element opens only the corresponding discharge path, and no vapor leakage occurs.

[0009]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIGS. 1 and 2). The main body 1 and the lid member 2 are connected by the bolts 3 to form a valve casing having a valve chamber 4 inside. The main body 1 has an inlet 5 communicating with the upper part of the valve chamber 4.
And an outlet 6 coaxial with the inlet 5 is formed. Exit 6
Communicate with the inside of an outlet pipe 7 extending to the lower part of the valve chamber 4.

In the outlet pipe 7, a first valve seat member 9 having a first outlet passage 8 opened and a second valve seat member 11 having a second outlet passage 10 opened.
And the third valve seat member 13 having the third lead-out passage 12 opened therein are screwed together. The valve chamber 4 communicates with the inside of the outlet pipe 7 through the first, second and third outlet passages 8, 10, 12.

In the valve chamber 4, there is provided a first opening / closing means for opening / closing the first outlet passage 8.
A temperature control element 14, a second temperature control element 15 that opens and closes the second outlet path 10, and a third temperature control element 16 that opens and closes the third outlet path 12 are arranged. The temperature control element 14 is a mounting member 1 fixed between the outlet pipe 7 and the first valve seat member 9.
7, the temperature control element 15 is held by a mounting member 18 fixed between the outlet pipe 7 and the second valve seat member 11, and the temperature control element 16 is held by the outlet pipe 7 and the third valve seat member 13. It is held by a mounting member 19 fixed between the two. Mounting member 1
Fluid passage windows 20, 21, and 22 are opened in 7, 18, and 19, respectively.

As shown in FIG. 2, the temperature control elements 14, 15 and 16 are internally provided between a wall member 24 having an injection port 23, a plug member 25 for sealing the injection port 23, and the wall member 24. A diaphragm 27 forming a space 26, a valve member 28 fixed to the diaphragm 27, and a fixed wall member 2 fixed by sandwiching the outer peripheral edge of the diaphragm 27 with the wall member 24.
9, a stopper 30 fixed to the wall member 24, and an expansion medium (A, B, C) enclosed in the internal space 26.

The expansion medium A enclosed in the internal space 26 of the temperature control element 14 is water, a liquid having a lower boiling point than water, or a mixture thereof, and the internal space 2 of the temperature control element 15 is
The expansion medium B enclosed in 6 is a liquid having a lower boiling point than the expansion medium A, or a mixture formed to have a lower boiling point, and the expansion medium C enclosed in the internal space 26 of the temperature control element 16 is expanded. It is a liquid having a lower boiling point than the medium B, or a mixture formed to have a lower boiling point.

At the time of start-up, the temperature inside the valve chamber 4 is low, and the expansion media A, B and C contract in the temperature control elements 14, 15 and 16, respectively, and the first and second derivation paths 8 and 10, Third outlet 12
Is open. When the temperature of the fluid flowing into the valve chamber 4 gradually rises due to the discharge of the low temperature fluid, the expansion medium C, the expansion medium B, and the expansion medium A expand in this order, and the temperature control element 16 first The third derivation path 12, the temperature control element 15 then closes the second derivation path 10, and finally the temperature control element 14 closes the first derivation path 8.

When the temperature in the valve chamber 4 decreases due to heat radiation or the like, the expansion medium A first contracts to cause the temperature control element 14 to move to the first position.
The outlet path 8 is opened and the condensate is discharged. At this time, when the amount of condensate generated is small and steam flows into the valve chamber 4,
The expansion medium A expands again and the temperature control element 14 closes the first lead-out path 8. When a large amount of condensate is generated and low-temperature condensate flows in, the expansion medium B contracts, the temperature control element 15 opens the second outlet path 10, and the expansion medium C further expands.
Also contracts and the temperature control element 16 also opens the third lead-out path 12.

[0016]

The present invention produces the following unique effects. As described above, according to the present invention, since a plurality of temperature control elements open and close a plurality of discharge paths according to the amount of condensed water generated, a thermal reaction that can discharge a small amount to a large amount of condensed water without causing steam leakage. A type steam trap can be provided.

[Brief description of drawings]

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

FIG. 2 is an enlarged sectional view of the temperature control element of FIG.

[Explanation of symbols]

 1 Main Body 2 Lid Member 4 Valve Chamber 5 Inlet 6 Outlet 8 First Outflow Path 10 Second Outflow Path 12 Third Outflow Path 14 First Temperature Control Element 15 Second Temperature Control Element 16 Third Temperature Control Element 24 Wall Member 26 Internal space 27 Diaphragm A, B, C 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 a discharge passage,
A thermal control type steam trap in which a temperature control element, in which an expansion medium is enclosed in an internal space between a wall member and a diaphragm, is placed in a valve chamber, and a discharge path is opened / closed by displacement of the diaphragm due to expansion / contraction of the expansion medium. A plurality of temperature control elements that form a plurality of passages and open and close each outlet passage are arranged in the valve chamber, and the expansion and contraction temperature of the expansion medium enclosed in each temperature control element is made different. A heat-actuated steam trap.