JP6022328B2 - Float type steam trap - Google Patents

Description

The present invention relates to a float type steam trap that automatically discharges drain generated in a steam piping system by floating up and down of a float, and in particular, cleans foreign matter in a fluid adhering to an inner surface of a discharge passage of a valve seat member on which a float is separated. Regarding what can be done.

A conventional float steam trap is disclosed in, for example, Patent Document 1. The valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member is attached to the lower portion of the valve chamber, a discharge passage that communicates the valve chamber with the outlet side is formed in the valve seat member, and the valve seat is formed in the valve chamber. A float that opens and closes the discharge passage by being seated on and off the member is disposed, an operation member that can be advanced and retracted is disposed in the discharge passage, and the foreign matter adhering to the inner surface of the discharge passage of the valve seat member is cleaned by the advancement and retraction of the operation member The temperature responsive member is connected to the operation member, and the operation member is advanced at a low temperature and retracted at a high temperature by deformation of the temperature responsive member.

JP 2007-138984 A

The above-mentioned conventional float type steam trap adjusts the cleaning temperature because the cleaning temperature when the operating member moves forward and cleans the foreign matter adhering to the inner surface of the discharge passage of the valve seat member is determined by the molding of the temperature-responsive member. There was a problem that it was not possible.

Therefore, the problem to be solved by the present invention is to provide a float type steam trap capable of adjusting the cleaning temperature when the operating member moves forward and cleans foreign matter adhering to the inner surface of the discharge passage of the valve seat member.

In order to solve the above problems, the float type steam trap of the present invention forms an inlet, a valve chamber, and an outlet in a valve casing, attaches a valve seat member to the lower portion of the valve chamber, and exits the valve chamber to the valve seat member. A discharge passage that communicates with the valve is formed, a float that opens and closes the valve seat member to open and close the valve seat member is disposed in the valve chamber, and an operation member that can be advanced and retracted is disposed in the discharge passage. For cleaning foreign matter adhering to the inner surface of the discharge passage of the seat member, connecting a temperature responsive member to the operation member, and moving the operation member forward at a low temperature and retreating at a high temperature by deformation of the temperature responsive member. The case is provided on the same axis as the member, the temperature responsive member is accommodated in the case, and a guide hole for sliding and guiding the front side of the operation member in the axial direction of the valve seat member is provided on one end side of the case. Adjustable to move back and forth in the axial direction The member is screwed to the other end of the case, and a guide hole is provided in the adjustment member for sliding and guiding the rear side of the operation member in the axial direction of the valve seat member. When the operation member is retracted, the rear end of the operation member Is provided with a back wall in the guide hole of the adjustment member that restricts the operation member from retreating more than a predetermined amount, and one end side of the temperature-responsive member is attached to the adjustment member, and the other end side is attached to the operation member. Is.

According to the present invention, by operating the adjustment member from the outside and screwing it back and forth in the axial direction of the case, the temperature responsive member having one end attached to the adjustment member is displaced in the axial direction of the case, and the temperature responsive member The operating member attached to the other end of the valve displaces in the axial direction of the case, and the cleaning temperature changes when the operating member moves forward and cleans foreign matter adhering to the inner surface of the discharge passage of the valve seat member. As a result, an excellent effect is obtained that the cleaning temperature can be adjusted when the operating member moves forward and cleans the foreign matter adhering to the inner surface of the discharge passage of the valve seat member.

It is sectional drawing of the float type steam trap concerning embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to FIG. A lid 2 is fastened to the main body 1 with bolts 3 to form a valve casing, and a valve chamber 4 is formed inside. The main body 1 has an inlet 5, an outlet passage 6 and an outlet 7, and the inlet 5 communicates with the upper portion of the valve chamber 4. The inlet 5 and the outlet 7 are formed on the same axis. A valve seat member 9 having a discharge passage 8 is screwed to the lid 2 at the bottom of the valve chamber 4. The discharge passage 8 includes a small-diameter leading end portion 8a at the end of the valve chamber 4, a tapered portion 8b having a diameter increasing toward the downstream downstream of the leading end portion 8a, and a large-diameter rear end portion 8c downstream of the tapered portion 8b. Become. The lid 2 has an outlet passage 10, and the lower portion of the valve chamber 4 communicates from the discharge passage 8 to the outlet 7 through the outlet passages 10 and 6. A hollow spherical float 11 that opens and closes the discharge passage 8 by being seated on the valve chamber side end surface 9a of the valve seat member 9 is disposed in the valve chamber 4 in a free state. Two float seats 12 with which the float 11 abuts at the position where the discharge passage 8 is closed are provided below the float 11 on the side facing the front side of the drawing.

A case 13 is screwed to the lid 2 on the same axis as the valve seat member 9. A bimetal 14 as a temperature responsive member is accommodated in the case 13, and the operation member 15 is disposed through the case 13. The bimetal is obtained by firmly bonding two kinds of metals or alloys having different coefficients of thermal expansion together and finishing them into a plate shape. The bimetal is curved in accordance with a change in temperature. A spiral winding formed by spirally winding a bimetal flat plate is spirally wound again to form a double spiral winding. In the first spiral shape, the inside is made of a high expansion material and the outside is made of a low expansion material. In the case of this helically wound shape, the radius becomes smaller and the length becomes longer when the temperature becomes low, and the reverse action occurs when the temperature becomes high. And in the case of the double helix formed using this, the radius becomes smaller and the length becomes longer when the temperature is lowered, and the opposite action is exerted when the temperature is raised. A guide hole 13 a that slides and guides the front side of the operation member 15 in the axial direction of the valve seat member 9 is provided on one end side of the case 13. An adjustment member 16 that can be moved back and forth in the axial direction of the case 13 is screwed to the other end of the case 13. A guide hole 16 a that slides and guides the rear side of the operation member 15 in the axial direction of the valve seat member 9 is provided in the adjustment member 16. A rear wall 16b is provided in the guide hole 16a of the adjustment member 16 so that the rear end of the operation member 15 comes into contact with the operation member 15 when the operation member 15 retreats and restricts the operation member 15 from retreating more than a predetermined amount. One end of the bimetal 14 is attached to the adjustment member 16 by welding and the other end is attached to the operation member 15 by welding. The operating member 15 moves forward at a low temperature due to the deformation of the bimetal 14, the front end portion 15 a protrudes into the valve chamber 4, retreats at a high temperature, the front end portion 15 a is located behind the front end portion 8 a of the discharge passage 8, and the rear end Is in contact with the inner wall 16b of the guide hole 16a of the adjusting member 16, and the retreat beyond a predetermined level is restricted. By restricting the retraction of the operation member 15 at a predetermined temperature or higher at a high temperature, it is possible to prevent the length of the bimetal 14 from being shortened to a predetermined value or more due to the flow of the discharged drain. The outer diameter of the distal end portion 15a of the operation member 15 is formed to be slightly smaller than the inner diameter of the distal end portion 8a of the discharge passage 8, and the front end portion 15a of the discharge passage 8 is cleaned by the distal end portion 15a by advancement. A protective cap 17 is screwed to the lid 2. When the protective cap 17 is removed and the adjusting member 16 is operated from the outside and screwed in the axial direction of the case 13 to advance, the operating member 15 advances and the distal end of the discharge passage 8 of the valve seat member 9 is advanced at the distal end portion 15a. The cleaning temperature when cleaning the foreign matter adhering to the inner surface of the portion 8a can be raised, and conversely, the cleaning temperature can be lowered if the adjusting member 16 is retracted.

Drain flowing in from the inlet 5 accumulates in the valve chamber 4, and the float 11 rises and falls according to the liquid level and is seated on and off the valve seat member 9 to open and close the discharge passage 8. When the discharge passage 8 is opened, drain in the valve chamber 4 is discharged to the outlet 7 through the discharge passage 8 and the outlet passages 6 and 10, and when the discharge passage 8 is closed, leakage of gas in the valve chamber 4 is prevented. If the drain is discharged normally, the bimetal 14 is kept at a high temperature and the operating member 15 is moved backward.

When foreign matter adheres to the inner surface of the distal end portion 8a of the discharge passage 8 of the valve seat member 9 and the drain cannot be discharged normally, the bimetal 14 becomes low temperature and the operation member 15 is advanced. As a result, the inner surface of the distal end portion 8 a of the discharge passage 8 of the valve seat member 9 is cleaned by the distal end portion 15 a of the operation member 15.

INDUSTRIAL APPLICABILITY The present invention can be used for a float type steam trap that automatically discharges drain generated in a steam piping system.

DESCRIPTION OF SYMBOLS 1 Main body 2 Lid 4 Valve chamber 5 Inlet 7 Outlet 8 Discharge passage 8a Discharge passage front end 9 Valve seat member 11 Float 13 Case 13a Guide hole 14 Bimetal 15 Operation member 15a Operation member front end 16 Adjustment member 16a Guide hole 16b Guide Back wall of hole

Claims (1)

The valve casing forms an inlet, a valve chamber, and an outlet, a valve seat member is attached to the lower portion of the valve chamber, a discharge passage that communicates the valve chamber with the outlet side is formed in the valve seat member, and the valve seat member is separated from the valve seat member. A float that sits and opens and closes the discharge passage is disposed, an operation member that can be advanced and retracted is disposed in the discharge passage, and the foreign matter adhering to the inner surface of the discharge passage of the valve seat member is cleaned by the advancement and retraction of the operation member, A temperature-responsive member is connected to the operating member, and the case is moved forward at low temperatures and retracted at high temperatures by deformation of the temperature-responsive member. A case is provided on the same axis as the valve seat member, and the temperature-responsive member is accommodated in the case. A guide hole for sliding and guiding the front side of the operation member in the axial direction of the valve seat member is provided on one end side of the case, and an adjusting member capable of moving back and forth in the axial direction of the case is screwed on the other end side of the case. Connect the rear side of the operating member to the shaft of the valve seat member A guide hole that slides and guides in the direction is provided in the adjustment member, and when the operation member is retracted, a rear wall that abuts the rear end of the operation member to restrict the operation member from being retracted more than a predetermined amount is provided in the adjustment member guide hole. A float type steam trap, wherein one end side of the temperature responsive member is attached to the adjusting member, and the other end side is attached to the operation member.

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