JPS6111599Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a unit-replaceable steam top, and incorporates a valve that controls selective drainage of condensate using a steep trap, a thermoelement that controls its operation according to temperature, and its counter spring. The trap unit, which is the main component of the trap sleeve, is particularly easy to replace when the trap is to be used selectively depending on the set drainage temperature, or when a malfunction needs to be repaired.Furthermore, the response of the thermoelement to the condensate temperature has been improved. We propose a unit-replaceable steam trap.

By the way, Utility Model Publication No. 55-9757 discloses temperature-dependent operation of a valve body by using a bimetallic unit as a thermoelement, but it does not take into account that the valve-closing force acting on the valve body changes depending on the pressure. do not have.

In general, the temperature at which condensate is discharged from this type of steam trap is determined by the performance of the thermoelement built into the trap unit, such as the thermowax assembly, while the pressure of the pipe system from which condensate is discharged from the steam trap is determined by the original pressure. Since the pressure is not uniform and the operating force of the valve controlling drainage depends on the pressure, it is necessary to prepare a thermoelement and a counter spring in advance as a trap unit that is compatible with various temperature-pressure characteristics.
By making it possible to use them selectively, the set drainage temperature of the steam trap can be adapted to the intended use, and by using the trap's casing and cover as common members, it can be used for various set drainage temperatures. This means that it can be handled conveniently, and it can also be advantageously handled in the event of a change in the specifications of the trap in use or in the event of a breakdown.

For this purpose, the following configuration according to the invention is used: a casing with an inlet, an outlet and a valve opening communicating with the condensate, and a cover screwed to the casing, closing off the condensate reservoir inside the casing. and a trap unit in which a valve that controls the opening and closing of the valve port according to the temperature in the condensate reservoir chamber is built into a sleeve together with a thermoelement and a counter spring, and one end of the counter spring is locked at the lower end of the sleeve of the trap unit. an inward facing flange, a male threaded part is provided on the outer periphery of the opposite end to the inward facing flange, and the male threaded part is a discontinuous female threaded part at the tip of a convex part provided alternately with a recessed part forming a through hole on the inner surface of the cover. This is suitably accomplished by a unit replaceable steam trap screwed onto the thermoelement and further comprising a support spring disposed between the cover and the thermoelement.

The purpose of this invention is to make the replacement of the trap unit extremely easy and convenient in such cases, and to improve the responsiveness of the thermoelement to the condensate temperature.

An embodiment of this invention is shown in cross section in FIG. 1, in which 1 represents a casing, 2 a cover, and 3 a trap unit.

The casing 1 has a condensate inlet 4, an outlet 5 and a valve port 6 opening towards the outlet 5 in this example,
The valve port 6 is provided with a valve seat 7 as usual, and the inside of the casing 1 is used as a condensate reservoir chamber 8.

The cover 2 closes the condensate reservoir chamber 8 of the casing 1, and is screwed directly to the casing 1 as shown in the figure, or screwed 9 by bolts or nuts to a mounting flange (not shown) provided on the casing as appropriate. As a result, the condensate reservoir chamber 8 is partitioned and isolated from the outside.

The trap unit 3 includes a valve 10 that connects to the valve seat 7 and closes the valve port 6, and a thermostatic valve that presses down the valve 10 as the temperature inside the condensate reservoir chamber 8 increases, forcing it to come into contact with the valve seat 7. A thermo-element 11, which is an example of a thermo-element assembly, and a counter spring 12 that opposes the temperature-sensitive thrust of the thermo-element 11 are assembled inside a sleeve 13, and the sleeve 13 engages the counter spring 12 at one end. It has an inward flange 13a for stopping, and a male threaded portion 13b on the outer periphery of the opposite end of the flange 13a. Here, the thermoelement 11 is made by mixing metal powder into wax, which makes it possible to select a composition with a large difference in coefficient of thermal expansion during transformation between the solid and liquid phases, so as to improve its temperature-sensitive characteristics. The so-called thermowax is stored in a cylindrical outer box 11 as shown in the figure.
Inside a, the outer box 1 is exposed to the expansion force of the thermowax.
It is preferable to use a thermowax assembly that is enclosed together with a stem 11c that slides in the reduced diameter portion 11b of the valve 1a and transmits the temperature-sensitive thrust to the valve 10.

The male thread 13b provided on the sleeve 13 of the trap unit 3 is screwed into the discontinuous female thread 2b at the tip of the protrusion 2a shown in Fig. 2 in this invention, and a through hole 2d is formed by the recess 2c and the sleeve 13. Convection occurs in the condensate that flows into the condensate reservoir chamber 3 from the inlet 4, and the accurate condensate temperature is conveyed through the through hole 2d to the outer box 11a containing thermowax.

This support spring 14 is configured such that when a temperature-sensitive thrust is generated in the thermoelement 11, this force is applied to the valve 10 via the stem 11c, and the counter spring 12 acts on the valve 10 through the stem 11c.
In addition to being useful for providing the reaction force necessary to push the valve 10 down toward the valve seat 7, the temperature inside the condensate reservoir chamber 8 becomes abnormally high when the valve is closed. It also serves to absorb over-expansion of the thermo-element, which is sometimes a concern.

The effects of the above configuration are as follows. First, low-temperature condensate is drained from the inlet 4, through the condensate storage chamber 8, and through the valve port 6 toward the outlet 5. As the temperature of the condensate subsequently arriving at the inlet 4 increases accordingly, the thermostatic When the temperature of the element 11 increases, the expansion force generated therein pushes down the valve 10 via the stem 11c against the counter spring 12, and in the balanced position of the valve 10 achieved in this way, the condensate temperature does not fluctuate. As long as the water is drained continuously at a constant temperature. When the temperature of this wastewater rises further due to the subsequent steam, the valve 10 finally comes into contact with the valve seat 7 and closes the valve port 6, but at this time, the pressure inside the condensate reservoir acting on the effective pressure receiving area of the valve port increases. By using a thermoelement designed so that the maximum compressive force generated in the counter spring 12 at that time is equal to or higher than the valve closing force determined by the valve closing force, the condensate temperature in the condensate reservoir chamber 8 is lower than the set drainage temperature. As soon as it becomes low,
The counter spring 12 pushes the valve 10 up to a position where it again balances the temperature-sensitive thrust acting on the valve 10 by the thermoelement 11, causing the valve to open, and condensate below that temperature continues to be drained.

In this way, when installing the cover 2, trap units 3 prepared in advance under various temperature characteristics are selected, and the cover 2 is attached with screws.
By simply screwing this cover 2 to the casing 1 in combination with the steam trap, you can easily and reliably adjust the set drainage temperature according to the usage of the trap. In the event of a change or failure, the trap unit can be easily replaced by simply removing the cover 2 from the casing 1 and reassembling it in the same manner as described above.

Therefore, this invention makes it particularly simple and easy to replace the trap unit incorporating the thermoelement and counter spring of the steam trap according to the temperature and pressure specifications.
The trap casing and cover can be used in common for various temperature-pressure characteristics, making it easy to change specifications and repair failures, and by providing a through hole, it is easy to restore the thermostat. This has the effect of improving responsiveness to water temperature.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of this invention, and FIG. 2 is a sectional view of the main part of the cover. 1... Casing, 2... Cover, 3... Trap unit, 4... Inlet, 5... Outlet, 6...
Valve port, 8... Condensate storage chamber, 10... Valve, 11...
Thermoelement, 12...Counter spring, 13
...Sleeve, 14...Support spring, 2a...Convex portion, 2b...Female threaded portion, 2c...Concave portion, 13
b...Male thread part.

Claims (1)

[Scope of utility model registration request] A casing equipped with a condensate inlet, an outlet, and a valve port that communicates with the outlet, a cover that closes a condensate reservoir inside the casing and is screwed to the casing, and a cover that closes a condensate reservoir chamber inside the casing and is provided with a valve port that communicates with the condensate reservoir chamber according to the temperature. It consists of a trap unit in which a valve that controls the opening and closing of the valve is built into a sleeve along with a thermoelement and a counter spring. A male threaded portion is provided on the outer periphery, and the male threaded portion is screwed into a discontinuous female thread at the tip of a convex portion provided alternately with a recessed portion forming a through hole on the inner surface of the cover. A replaceable unit steam trap consisting of a supporting spring.