JPH06241393A - Orifice type steam trap - Google Patents

Abstract

PURPOSE:To permit a valve to be closed even if steam flows into a pressure chamber, by arranging a temperature sensing member which increases the opening degree of an orifice for the communication of the pressure chamber to the inlet side at a low temperature, while reduces the opening degree at a high temperature and allowing a chamber formed on the other side to communicate to an outlet. CONSTITUTION:When the low temperature condensed water flows in from an inlet 3 side, a bimetal 20 which constitutes a temperature sensing member deforms projectingly upward, and separates a temperature sensing valve element 21 from the first orifice 19, and the opening degree is increased. Accordingly, a large quantity of condensed water flows into a pressure chamber 16 from the first orifice 19, and a high pressure region is generated in the pressure chamber 16 by the increase of the capacity due to the reevaporation quantity in the pressure chamber 16, and a piston 12 lifts up a valve element 9, and a valve opening 8 is opened. When the high temperature condensed water flows in from the inlet 3 side, the bimetal 20 deforms projectingly downward, and sets the temperature sensing valve element 21 on the first orifice 19, and the opening degree is reduced. When the condensed water evaporation quantity on the inlet 3 side reduces, the valve element 9 is lowered by the fluid pressure on the inlet 3 side, and the valve opening 8 is closed.

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 a steam piping system, and particularly to displacement based on pressure fluctuation of a pressure chamber formed between two orifices. The present invention relates to an orifice-type steam trap in which a valve body is driven by a pressure responsive member to open and close a valve port that connects an inlet and an outlet.

[0002]

2. Description of the Related Art A conventional orifice type steam trap will be described with reference to Japanese Utility Model Publication No. 48-91538. This is a valve body that opens and closes a valve port that communicates the inlet and the outlet, a pressure responsive member that drives the valve body, a pressure chamber formed on one side of the pressure responsive member, and a pressure chamber that communicates with the inlet side. A first orifice and a second orifice that communicates the pressure chamber with the outlet side, and a chamber formed on the other side of the pressure responsive member is communicated with the inlet. When the low-temperature condensate flows into the pressure chamber through the first orifice, the pressure chamber has a low pressure because the amount of re-evaporation in the pressure chamber is small, and the pressure responsive member drives the valve element in the valve opening direction to open the valve opening. ing. When the high temperature condensate flows into the pressure chamber through the first orifice, the amount of re-evaporation increases and the volume significantly increases, so the pressure chamber becomes a high pressure region,
The pressure responsive member drives the valve body in the valve closing direction to close the valve port.

[0003]

In the above-mentioned one, since the amount of condensed water generated on the inlet side is small and the steam continuously flows into the pressure chamber through the first orifice, the steam does not re-evaporate in the pressure chamber. The pressure in the pressure chamber does not reach the high pressure range that displaces the pressure responsive member in the valve closing direction, and the pressure responsive member drives the valve element in the valve opening direction to open the valve opening, blowing off steam. There was a problem.

Therefore, a technical problem of the present invention is to obtain an orifice type steam trap which can be closed even if steam continuously flows into the pressure chamber.

[0005]

Means for Solving the Problems The technical means of the present invention taken to solve the above-mentioned technical problems are a valve body for opening and closing a valve port communicating an inlet and an outlet, and a pressure for driving the valve body. A first orifice including a response member, a pressure chamber formed on one side of the pressure response member, a first orifice communicating the pressure chamber with the inlet side, and a second orifice communicating the pressure chamber with the outlet side, It is characterized in that a temperature responsive member is provided for increasing the opening of the orifice at low temperature and small at high temperature, and a chamber formed on the other side of the pressure responsive member is communicated with the outlet.

[0006]

The operation of the above technical means is as follows.
When the low temperature condensate flows from the inlet side, the temperature responsive member increases the opening of the first orifice. Since a large amount of condensate flows into the pressure chamber through the first orifice, the pressure chamber becomes a high pressure region due to the increase in volume due to the re-evaporation amount in the pressure chamber, and the pressure responsive member drives the valve element in the valve opening direction to open the valve. Open your mouth. When the high temperature condensate flows in from the inlet side, the opening of the first orifice is reduced by the temperature responsive member, but the volume of the high temperature condensate remarkably increases due to re-evaporation, so the pressure chamber becomes a high pressure region, and the pressure responsive member The valve body is driven in the valve opening direction to open the valve opening. When the amount of condensate generated on the inlet side is small and steam continuously flows into the pressure chamber through the first orifice, the steam does not re-evaporate in the pressure chamber, so the pressure in the pressure chamber causes the pressure responsive member to close in the valve closing direction. The pressure response member drives the valve body in the valve closing direction to close the valve opening, without reaching the high pressure region for displacement.

[0007]

EXAMPLE A first example showing a concrete example of the above technical means will be described (see FIG. 1). The lid member 2 is fastened to the main body 1 with bolts (not shown) to form a trap casing. The main body 1 has an inlet 3 and an outlet 4 formed on the same axis.
The inlet 3 and the outlet 4 are separated by a partition wall 5 and communicate with each other by a fluid passage window 7 opened in the valve seat member 6 and a valve port 8. Valve 8
The valve body 9 facing the above is opened and closed from the inlet 3 side. The valve body 9 is a valve rod portion 11 that penetrates a partition wall 10 at the lower end of the valve seat member 6.
And a piston 12 as a pressure responsive member has a nut 1
Fixed at 3. The piston 12 slides in the cylinder 14, and a seal ring 15 keeps airtight between them. A pressure chamber 16 is formed on the lower surface side of the piston 12. The chamber on the side opposite to the pressure chamber 16 communicates with the outlet 4 side by a communication passage 17 opened in the partition wall 10 of the valve seat member 6.
The pressure chamber 16 communicates with the chamber on the opposite side by a second orifice 18 penetrating the pressure chamber 16, communicates with the outlet 4 side through a communication passage 17, and also with the first orifice 19 opened in the valve body 9 toward the inlet 3 side. Communicate.

A temperature responsive member composed of a bimetal 20 and a temperature responsive valve body 21 is arranged on the inlet 3 side so as to face the first orifice 19. The temperature responsive valve body 21 is the first orifice 1
A through hole 22 having a diameter smaller than 9 is provided in the center. The bimetal 20 is inverted according to the ambient temperature, and when the temperature is high, the bimetal 20 is convex downward, and when the temperature is low, it is convex upward. When it is convex downward, the upper surface of the outer periphery abuts on the snap ring 23, and the temperature-responsive valve body 21 is seated on the first orifice 19 to reduce the opening degree of the first orifice 19. When it becomes convex upward, the lower surface of the outer periphery abuts on several stepped portions 24 of the valve body 9 to separate the temperature-responsive valve body 21 from the first orifice 19 and increase the opening degree of the first orifice 19.

The operation of the above embodiment is as follows. When the low temperature condensate flows in from the inlet 3 side, the bimetal 20 becomes convex upward, and the temperature responsive valve body 21 is connected to the first orifice 1
The first orifice 19 is opened to increase the opening degree. Since a large amount of condensed water flows into the pressure chamber 16 through the first orifice 19, the pressure chamber 16 becomes a high pressure region due to an increase in volume due to the re-evaporation amount in the pressure chamber 16, and the piston 12 lifts the valve body 9 to open the valve opening. Open 8 When the high temperature condensate flows in from the inlet 3 side, the bimetal 20 has a downward convex shape, and the temperature responsive valve body 21 is seated on the first orifice 19 to reduce the opening degree of the first orifice 19.
Since the volume of the high temperature condensate increases significantly due to re-evaporation, the pressure chamber 16 becomes a high pressure region, and the piston 12 lifts the valve body 9 and opens the valve port 8. When the amount of condensed water generated on the inlet 3 side is small and the steam continuously flows into the pressure chamber 16 through the first orifice 19, the steam does not re-evaporate in the pressure chamber 16, so the pressure in the pressure chamber 16 causes the piston 12 to move. The valve body 9 does not reach the high pressure region for lifting, and the valve body 9 is lowered by the fluid pressure on the inlet 3 side to close the valve opening 8.

[0010]

The present invention produces the following unique effects. As described above, according to the present invention, the valve can be closed when the steam continuously flows into the pressure chamber, so that the steam is not blown off.

[Brief description of drawings]

FIG. 1 is a sectional view of an orifice type steam trap according to an embodiment of the present invention.

[Explanation of symbols]

 3 inlet 4 outlet 8 valve opening 9 valve body 12 piston 16 pressure chamber 18 second orifice 19 first orifice 20 bimetal 21 temperature responsive valve body 22 through hole

Claims (1)

[Claims] 1. A valve body that opens and closes a valve port that connects an inlet and an outlet, a pressure responsive member that drives the valve body, a pressure chamber formed on one side of the pressure responsive member, and a pressure chamber on the inlet side. A first orifice that communicates with a second orifice that communicates with the pressure chamber on the outlet side. A temperature responsive member that increases the opening of the first orifice at a low temperature and decreases at a high temperature is provided on the other side of the pressure responsive member. An orifice-type steam trap characterized in that the chamber formed in the above is communicated with the outlet.