JPH08247392A - Large capacity steam trap - Google Patents

Abstract

PURPOSE: To provide a large capacity steam trap which is composed without individually arranging a pilot valve and a piston valve and moreover simple in structure and small-sized. CONSTITUTION: An inlet 3, a valve port 4 and an outlet 5 are formed in a trap casing. A piston valve body 6 is arranged opposite to the valve port 4. A cylinder member 8 is provided around the piston valve body 6. A thermal reacting valve 11 is attached inside the cylinder member 8. An entrance communication passage 10 is provided in the piston valve body 6 to make the inside of the cylinder member 8 and the inlet 3 communicate mutually. On the other hand, a through hole 16 which allows the inside of the cylinder member 8 to communicate with the outlet 5 or shuts off them from each other by the thermal reacting valve 11 is provided.

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 only condensate generated in a steam pipe or a steam using device, and more particularly to a trap capable of discharging a large amount of condensate. The steam trap must discharge condensate condensed by the work of steam quickly without leaving the steam and without leaking the steam. Further, in a device that uses a large amount of steam, a large amount of condensed water is generated, but this large amount of condensed water must also be promptly discharged.

[0002]

2. Description of the Related Art Conventionally, a steam trap as disclosed in, for example, Japanese Patent Publication No. 62-6153 has been used. This uses a float valve that floats and descends according to the inflow of condensate as a pilot valve.
By connecting a piston valve and a piston valve of a relatively large diameter in series,
When condensed water flows in and the pilot float valve opens, a large-diameter piston valve opens and a large amount of condensed water is discharged.

[0003]

SUMMARY OF THE INVENTION In the above conventional one,
There is a problem that the structure is complicated and the shape of the trap becomes large. This is because the pilot valve and the piston valve are arranged independently of each other, so that a passage or the like for communicating the respective members is required and the structure becomes complicated and the shape becomes large. If the structure is complicated and the shape is large, the probability of failure increases and the price of the product becomes expensive.

Therefore, the technical problem of the present invention is to provide a pilot valve and a piston valve separately from each other.
The aim is to obtain a large-capacity steam trap with a simple structure and a small size.

[0005]

The technical means of the present invention taken to solve the above technical problems is a trap case.
A piston valve element that forms an inlet and an outlet through a valve opening and that opens and closes the valve opening is disposed facing the valve opening, and the piston valve element slides in a cylinder member attached to a trap casing. A temperature responsive valve is provided in the cylinder member so as to be movable and urged by an elastic member in the valve closing direction to form an inlet communication passage communicating with the inlet in the cylinder member and for disconnecting communication with the outlet. It is a thing.

[0006]

The operation of the above technical means is as follows.
The fluid flowing from the inlet reaches the inside of the cylinder member via the inlet communication passage. If the temperature of the inflowing fluid is lower than a predetermined temperature, the temperature-responsive valve provided in the cylinder member contracts to communicate the inside of the cylinder member with the outlet,
The fluid does not stay in the cylinder member. Therefore, the piston valve body slides on the cylinder member by the fluid pressure from the inlet to separate from the valve opening and open the valve opening, whereby the fluid from the inlet flows down to the outlet side through the valve opening.

When the temperature of the fluid from the inlet becomes higher than a predetermined temperature, the temperature responsive valve expands and shuts off the inside of the cylinder member from the outlet, so that the fluid flowing into the inside of the cylinder member through the inlet communication passage is released. It stays and becomes the same pressure state as the inlet side. Therefore, the pressure conditions before and after the piston valve body are the same, and the piston valve body is displaced toward the valve opening by the elastic force of the elastic member to close the valve opening, thereby preventing the fluid from flowing down to the outlet side.

As described above, when the temperature of the fluid flowing into the trap casing is low, that is, when the condensate is steam condensed and the temperature is low, the valve opening is opened and the outlet is opened. However, when the temperature is high like steam, the valve port is closed to function as a steam trap that prevents the flow down to the outlet side.

[0009]

EXAMPLE An example showing a concrete example of the above technical means will be described (see FIG. 1). A trap casing is formed by the main body 1 and the lid 2. The inlet 3, the valve opening 4 and the outlet 5 are formed by trap casing. An annular piston valve seat 19 is provided around the valve opening 4. A piston valve body 6 is arranged so as to face the valve opening 4. The piston valve body 6 has a conical shape on the valve port 4 side and connects the cylindrical portion 7. A substantially cylindrical cylinder member 8 fixed by trap casing is attached around the cylindrical portion 7.
The lower surface of the cylinder member 8 is covered with a partition wall 9 formed on the lid 2, and the cylindrical portion 7 of the piston valve body 6 is slidably arranged on the inner circumference of the cylinder member 8. An inlet communication passage 10 that connects the inlet 3 and the inside of the cylinder member 8 to the upper end portion of the piston valve body 6.
Is provided so as to penetrate.

A temperature responsive valve 11 as a pilot valve is provided inside the cylinder member 8. The temperature responsive valve 11 has a diaphragm 14 sandwiched between an upper wall member 12 and a lower wall member 13, a disc-shaped temperature responsive valve body 15 is welded and fixed to the lower surface of the diaphragm 14, and thermal expansion is performed in the upper space of the diaphragm 14. The medium 26 is sealed. As the thermal expansion medium 26, a fluid such as alcohol whose boiling point is slightly lower than that of water, or a mixture of these fluids is used. A valve seat member 17 having a through hole 16 formed in the lower portion of the temperature responsive valve body 15 is attached to the partition wall 9 of the lid 2 of the trap casing. A cylindrical holder 18 having through holes 20 and 21 is sandwiched between the partition wall 9 and the valve seat member 17 to be attached to hold the upper and lower wall members 12 and 13 of the temperature responsive valve 11. A coil spring 22 as an elastic member for urging the piston valve body 6 toward the valve port 4 side is arranged between the upper wall member 12 and the conical portion of the piston valve body 6. Coil spring 22 and inlet communication passage 10
A hemispherical screen 23 for removing foreign matter in the fluid flowing in from the inlet communication passage 10 is attached by a spring ring 25 between them.

Next, the operation will be described. The state shown in FIG.
The temperature of the fluid flowing in from the inlet 3 is low, the thermal expansion medium 6 contracts, and the temperature responsive valve 11 opens, so that the through hole 1
6 shows a state in which 6 penetrates and the inside of the cylinder member 8 communicates with the outlet 5. The low-temperature fluid, that is, the condensate that has flowed in from the inlet 3 reaches the surroundings of the temperature-responsive valve 11 through the inlet communication passage 10 and the screen 23, but the temperature of the condensate is low, so that thermal expansion in the temperature-responsive valve 11 occurs. The medium 26 contracts and the diaphragm 14 and the temperature-responsive valve body 15 are separated from the valve seat member 17 by the fluid pressure, so that the condensed water does not flow down to the outlet 5 and stay in the cylinder member 8. Therefore, the piston valve body 6 is displaced downward by the fluid pressure from the inlet 3 to open the valve opening 4, so that a large amount of low-temperature condensate from the inlet 3 is discharged to the outlet 5 via the valve opening 4. You can

When the temperature of the fluid flowing in from the inlet 3 becomes high, the thermal expansion medium 26 of the temperature responsive valve 11 expands to displace the diaphragm 14 and the temperature responsive valve body 15 downward, and the through hole 16 of the valve seat member 17 is formed. To close the inside of the cylinder member 8 and the outlet 5. When cut off, the fluid on the inlet 3 side is supplied to the inside of the cylinder member 8 through the inlet communication passage 10, so that the inside of the cylinder member 8 is in a state of substantially the same pressure as the inlet 3, and the piston valve body 6 is fixed to the coil spring It is displaced toward the valve port 4 side by the elastic force, and finally the piston valve seat 19
The valve opening 4 is closed by sitting on the valve to prevent hot fluid, that is, vapor, from flowing down to the outlet 5.

[0013]

The present invention produces the following unique effects. As described above, according to the present invention, the temperature responsive valve as the pilot valve and the piston valve are not separately arranged, but the temperature responsive valve is arranged inside the piston valve, that is, the cylinder member, thereby simplifying the structure. In addition, the shape can be small.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a large capacity steam trap of the present invention.

[Explanation of symbols]

 1 Main Body 2 Lid 3 Inlet 4 Valve Outlet 5 Outlet 6 Piston Valve Body 8 Cylinder Member 10 Inlet Communication Path 11 Temperature Responsive Valve 14 Diaphragm 22 Coil Spring 26 Thermal Expansion Medium

Claims (1)

[Claims] 1. A trap casing forms an inlet and an outlet through a valve opening, and a piston valve body is arranged facing the valve opening to open and close the valve opening. The piston valve body is used for the trap casing. A temperature responsive valve that is disposed slidably in the attached cylinder member and biased by an elastic member in the valve closing direction to form an inlet communication passage that communicates with the inlet in the cylinder member and shuts communication with the outlet. A large-capacity steam trap in which a cylinder is provided in the cylinder member.