JPH0499A - Steam trap with valve - Google Patents

Abstract

PURPOSE:To enable an automatic valve operation with an automatic foreign matter cleaning function by arranging a strainer on a primary side of a steam trap, and mounting a strainer cleaning member on a changeover valve body driven by valve drive means. CONSTITUTION:A flow passage changeover valve 1 is connected to a steam trap 2 with a bolt 50. A changeover valve body 3 is turned by a motor 60 through a control rod 20, and thereby communicating a valve flow-in passage 10 with a valve flow-out passage 13 while it slides on a valve seat part 4. A float valve 14 and a trap valve seat 15 are provided in a trap valve chamber 18. A shaft part 3a of the valve body 3 extends downwards to be positioned on a primary side of a strainer 8, that is the side to communicate with a flow inlet 6, and a metal brush 30 is set as a strainer cleaning member thereon. When the motor 60 rotates, the brush 30 cleans the inner face of the strainer 8. The foreign matters cleaned are remains in a sump part 31 and discharge by removing a plug 67. It is thus possible to automatize the operation of valve through an automatic cleaning of strainer.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a steam trap with a valve that combines a steam trap that automatically discharges only condensate from a steam piping system and a valve for switching flow paths.

A steam trap is a type of automatic valve that automatically discharges only the condensate produced after steam has done its work, but the discharge valve opening is generally designed to be quite small compared to the diameter of the piping member. . This is because the specific volume of condensate is very small compared to the specific volume of steam, and this is to prevent steam leakage as much as possible. Therefore, when a large amount of condensate is generated, such as during the initial start-up of steam-using equipment, the condensate may accumulate if only the small valve opening is used. As a countermeasure to this problem, a bypass flow path using relatively large-diameter piping is provided in parallel with the steam trap, and the flow path is manually switched to the bypass flow path at the start of operation or initial start-up. However, in this case, it is complicated to operate a plurality of valves to switch each flow path, and a large installation space is required to provide a bypass flow path.

<Prior Art> Conventionally, the technology of a steam trap with a valve as shown in, for example, Japanese Utility Model Publication No. 50-31962 has been unsuccessful. This has a flow path switching valve integrated with the trap within the trap body, and by manually operating the flow path switching valve, it performs the normal trap function, bypass flow path function, and closing function. It is something that can be done. By integrally forming the trap and the flow path switching valve, a bypass flow path function can be obtained by manual operation of one flow path switching valve, and an increase in the installation space due to piping is prevented.

Problems to be Solved by the Present Invention> However, in the above-mentioned prior art, there is still the complexity of having to manually operate the flow path switching valve body. That is, when a steam trap with a valve is attached to steam-using equipment in a batch system that repeatedly starts and stops, it is necessary to manually operate the valve body to switch to the bypass flow path each time the trap is activated. In particular, this operation becomes extremely complicated when the interval between activation and deactivation is short or when the frequency of switching is high.

Further, in the prior art described above, there was a problem in that cleaning the strainer was complicated. In other words, in order to clean the strainer, you must operate the flow path switching valve to set it to the bypass flow path function or the closing function, and then remove the strainer by removing the lid from the trap body, etc., and then clean it. be.

A strainer built into a steam trap (a strainer is installed to prevent steam from leaking due to dirt or other foreign matter adhering to the valve sealing surface of the trap, but steam traps are usually installed at the outlet of various steam-using equipment) Because the steam trap is installed at the bottom of the side or at the end of the steam piping, a lot of foreign matter such as dust and scale from the steam-using equipment and inside the piping gets mixed into the steam trap.Therefore, each time you clean the strainer, remove it from the trap body. Removing it is a very tedious task.

Therefore, the technical problem of the present invention is to provide a steam trap with a valve that allows easy cleaning of the strainer and eliminates the need for manual operation of the flow path switching valve.

<Means for Solving the Problems> The technical means of the present invention taken to solve the above-mentioned technical problems is that the flow path switching valve and the steam trap are integrally formed. A strainer is arranged to capture foreign matter such as dust, a flow path switching valve is slidably arranged relative to the valve seat, and one end of the flow path switching valve is connected to the primary side of the strainer to clean the strainer. A member is attached, and the other end of the flow path switching valve is connected to a valve driving means.

<Operation> By connecting the valve driving means to the flow path switching valve, the flow path switching valve can be operated via the valve driving means, and no manual operation of the valve is required.

By means of a strainer cleaning member attached to the end of the flow path switching valve, the primary side of the strainer, that is, the side where foreign matter such as dust is captured and accumulated, is driven by the valve driving means, and the strainer is automatically cleaned. be done.

<Effects of the Invention> The strainer is automatically cleaned by the valve driving means, and there is no need to manually operate the valve, making it possible to automate the operation to obtain the highest efficiency of the steam-using equipment.

<Example> An example showing a specific example of the above technical means will be described. (
(See FIG. 1) The flow path switching valve 1 and the steam trap 2 are airtightly connected with bolts 50 via an upper lid 51 to form a steam trap with a valve.

The flow path switching valve 1 is formed by a switching valve body 3 provided with a through hole 12 and a valve seat portion 4. The main body 5 is formed with an inlet 6 and an outlet lower. A trap valve chamber 1 is provided in the main body 5 in communication with the inflow port 6.
A substantially cylindrical strainer 8 having pores is attached to the primary side of the trap valve chamber 18 using a snap ring 9. The inside of the cylindrical strainer 8 communicates with the switching valve body 3 through an upflow/inflow passage 10 . The switching valve body 3 and the outflow lower are communicated through a valve outflow path 13. The ascending inflow path 10, the through hole 12, and the valve outflow path 13 form a bypass flow path.

A hollow float 14 that rises and falls according to the level of inflowing condensate is disposed in a free state within the trap valve chamber 18. A trap valve seat 15 is attached to the lower part of the trap socket 18 by protruding inside the trap socket. A trap valve port 16 provided on the trap valve seat 15 communicates with the outflow lower via an upright passage 17.

The switching valve body 3 has a ball shape and is rotated by the driving means of the flow path switching valve 1 described below, and opens the bypass passage when the through hole 12 is located approximately coaxially with the one-side inflow passage 10 and the one-side outflow passage 13. (state shown in Figure 1), rotate 90° to close the bypass passage. The shaft portion 3a of the switching valve body 3 passes through the upper i51 and engages with the operating rod 20. The upper end of the operating rod 20 is connected to an output shaft 61 of a motor 60 as a valve body driving means.

In addition to the above-mentioned motor, the valve body driving means may be, for example, an air actuator operated by compressed air, a hydraulic actuator, or the like. The rotation of the motor 60 causes the operating rod 20 to rotate and the switching valve body 3 to rotate as well.

The shaft portion 3a of the switching valve body 3 extends downward so that its lower end is disposed on the primary side of the strainer 8, that is, on the side communicating with the inlet 6, and a metal brush 30 as a strainer cleaning member is placed on the axis. Install along. The end of the metal brush 30 is attached so as to be in contact with the inner peripheral surface of the strainer 8, and is fixed so as not to fall off even when the motor 60 rotates.

The motor 60 and various devices for switching power and operation (
Attach a coat (not shown) to connect the cable (not shown).

Reference numeral 66 represents a cover that protects the motor 60, and reference numeral 67 represents a plug.

In the above configuration, the motor 60 is driven in response to a signal for switching the operation of the motor 60, the operating rod 20 is rotated, and the switching valve body 3 is rotated, thereby forming the through hole 12, the single inlet passage 10, and the single outlet passage. ] 3 communicate with each other (the state shown in FIG. 1) to automatically form a bypass flow path, and the metal brush 30 also rotates to automatically clean the inner circumferential surface of the strainer 8.

By switching the actuation signal, the operating rod 20 is rotated in the opposite direction, and the one-side inflow passage 10 and one-side outflow passage 13 are shut off by the switching valve body 3, and the steam trap functions as a normal steam trap.

Foreign matter that has been cleaned and fallen from the inner periphery of the strainer 8 accumulates in a reservoir 31 at the bottom of the main body 5, and is appropriately removed to the outside by removing the plug 67.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a steam trap with a valve according to the present invention. 1: Flow path switching valve 2 Steam trap 3: Switching valve body 4: Valve seat 5: Main body 6 Two inflow lower: Outlet 8 Strainer 10: Single inflow path 13: Recirculation path 14: Float 20: Operation rod 30 : Metal brush 60: Motor No. 11"

Claims (1)

[Claims] 1. In a device in which a flow path switching valve and a steam trap are integrally formed, a strainer is placed on the primary side of the steam trap to capture foreign matter such as dust, and the flow path switching valve is slidable relative to the valve seat. A steam trap with a valve, wherein one end of the passage switching valve is connected to the primary side of the strainer, a strainer cleaning member is attached thereto, and the other end of the passage switching valve is connected to a valve driving means.