JP2020002955A - Temperature responsive valve with cleaning means - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a temperature-responsive valve having a simple structure and having a cleaning means capable of reliably removing foreign matter on the downstream side of a valve port (valve hole) without causing a fluid leakage such as a drain. SOLUTION: Foreign matter adhering to the valve seat downstream chamber 63 located downstream of a valve opening 62 is removed by a downstream blade 8 by a screwing operation of an adjusting rod 35 to perform cleaning. That is, if a tool such as a screwdriver is fitted into the operating groove 35c of the adjusting rod 35 and the adjusting rod 35 is loosened, the valve shaft 10 itself rotates and rises in the direction of arrow 105 via the connecting rod 10a, and the valve body The downstream blade 8 rotates close to the inner surface of the valve seat downstream chamber 63 via 2 and the central rod 4. As a result, the downstream blade 8 scrapes off the foreign matter adhering to the inner surface of the valve seat downstream chamber 63. [Selection diagram] Fig. 1

Description

  The temperature responsive valve having the cleaning means according to the present application relates to a technique for cleaning foreign matter adhered inside a temperature responsive valve such as a temperature control trap.

  In an industrial plant, a piping system for transferring high-temperature steam generated by a boiler toward a supply destination is installed, and drain (condensed water) is generated from the steam in the piping. A branch pipe for drain recovery is connected to the main pipe for transferring the steam, and the drain is often discharged as unnecessary matter by a steam trap installed at the end of the branch pipe.

  However, a temperature control trap as a temperature responsive valve may be used in order to intentionally retain the drain in the branch pipe and to adjust and use the temperature of the branch pipe to a predetermined set temperature. For example, when a high-viscosity fluid such as heavy oil is transported through a transport pipe, there is a disadvantage that the heavy oil or the like solidifies if the temperature decreases. For this reason, the branch pipe through which high-temperature steam or drain flows flows along the transport pipe to function as a trace heat transfer pipe, and exchanges heat with the transport pipe of heavy oil or the like to increase the temperature of heavy oil or the like and prevent solidification.

  Here, for example, in the case of heavy oil, a temperature of about 40 degrees is sufficient for transportation, but since the temperature of steam is 100 degrees or more, if steam is used as it is as a heat source of the trace heat transfer tube, the temperature of heavy oil rises There is too much danger. Therefore, a temperature control trap is provided at the end of the trace heat transfer tube, and the temperature of the trace heat transfer tube is adjusted to an appropriate set temperature.

  In the temperature control trap provided at the end of the trace heat transfer tube, a valve chamber into which steam or drain flows from the trace heat transfer tube is formed, and a discharge chamber is further formed below the valve chamber. . The valve chamber and the discharge chamber are connected by a small-diameter valve port, and steam and drain flow through the valve port with the valve chamber side being upstream and the discharge chamber side being downstream.

  In the valve chamber, a valve shaft provided with a valve body at the tip is disposed. The valve body at the tip is located toward the valve port, and a bimetal laminate as a temperature sensing member is attached to the valve shaft.

  When a high-temperature drain flows into the valve chamber, the bimetal laminate expands in response to the high temperature to move the valve shaft in the axial direction, and the valve body at the tip closes the valve port. Thereafter, when the temperature of the drain decreases due to heat exchange with the object to be heated, the bimetal laminate contracts in response to the temperature decrease, the valve shaft moves according to the extension of the return spring, and the valve body opens the valve port. The low-temperature drain is discharged to the discharge chamber. Thus, the opening and closing of the valve port is repeated based on the displacement of the valve shaft, and the temperature of the trace heat transfer tube is maintained at a constant reference temperature.

  The rear end of the valve stem protrudes outward from above the temperature control trap, and when operated by an operator from the outside, the valve shaft moves in the axial direction, and the position of the valve shaft in the valve chamber is adjusted. . Thereby, the reference temperature in the trace heat transfer tube can be freely set.

  Incidentally, foreign substances such as rust and scale (scale) may flow into the valve chamber of the temperature control trap together with steam and drain. If such foreign matter adheres and accumulates at or near the valve port, the foreign matter impedes the flow rate of the drain, making it impossible to properly adjust the temperature of the trace heat transfer tube. In particular, since the valve port of the temperature control trap is formed to have a small diameter in order to finely adjust the flow rate of the drain, the influence of the adhesion of foreign matter is large.

  Foreign matter may adhere to the upstream side of the valve port, but often adhere to the downstream side. As a cleaning technique for removing such foreign matter adhering to the downstream side of the valve port, there is a technique disclosed in Patent Document 1 described below. In this technique, a through hole is formed in the lower part of the body of the temperature control trap, and a bar-shaped cleaning tool is made to penetrate therethrough and disposed downstream of the valve port. The tip of the cleaning tool is configured as a shaper portion, and the shaper portion is located toward the valve port.

  When cleaning the downstream side of the valve port, this cleaning tool is moved in the axial direction, the tip shaper part is made to enter the vicinity of the valve port, and then rotated to remove foreign matter adhering to the downstream side of the valve port. To remove.

Patent No. 4388347

  In the technology disclosed in the above-mentioned Patent Document 1, in addition to the through hole provided at the upper portion for adjusting the valve, the through hole is also formed at the lower portion of the body, so that the hermeticity of the valve chamber is reduced. There's a problem.

  In particular, when a through hole is provided in the lower portion of the body, the drain may leak to the outside from the through hole. In order to prevent such leakage, a seal member such as a packing or an O-ring may be provided. However, leakage of the drain may occur due to deterioration of the seal member or movement of the cleaning tool during a moving operation.

  Also, in addition to the upper valve shaft, a cleaning tool operated from the outside is separately provided in the lower part, so that the outer shape of the temperature control trap becomes larger.When installing in a complicatedly arranged piping system, the upper and lower There is also a problem that a space for operation must be secured on both sides.

  Therefore, a temperature responsive valve having a cleaning means according to the present invention has an object to solve these problems, has a simple configuration, and has a valve port (valve hole) without causing leakage of fluid such as drain. It is an object of the present invention to provide a temperature responsive valve having a cleaning means capable of reliably removing foreign matter on the downstream side.

The temperature responsive valve having the cleaning means according to the present application,
A body connected to a piping system for transferring a fluid, the body having a valve space and a discharge space,
A valve hole as an opening formed in the main body and communicating the valve space and the discharge space,
Adjusting means having an adjusting valve located in the valve space, wherein the adjusting valve advances or retreats with respect to the valve hole along the rotation axis direction in response to the rotation operation or the temperature of the fluid, and Adjusting means for changing the degree of the opening,
A temperature responsive valve having cleaning means comprising:
A cleaning unit having a shaving unit located in the discharge space, and an interlocking unit that rotates the shaving unit in proximity to the inner surface of the discharge space in conjunction with the rotation operation of the adjusting unit;
It is characterized by having.

  In the temperature responsive valve having the cleaning means according to the present invention, the exfoliated portion of the cleaning means rotates close to the inner surface of the discharge space in conjunction with the rotation of the adjusting means located in the valve space.

  Therefore, it is not necessary to provide an operation unit for externally operating the discharge space on the downstream side of the flow of the fluid. For this reason, it is possible to reliably remove foreign matter on the downstream side of the valve hole without causing leakage of fluid such as drain while having a simple configuration.

It is a sectional view of a temperature control trap showing a 1st embodiment of a temperature responsive valve which has a cleaning means concerning this application. FIG. 2 is a view of the valve shaft 10 shown in FIG. 1 as viewed from a front end side (downstream side). FIG. 2 is an enlarged cross-sectional view of the vicinity of a valve seat 60 shown in FIG. 1, and is a cross-sectional view showing a state of a valve seat upstream chamber 61 during cleaning. FIG. 2 is an enlarged sectional view of the vicinity of a valve seat 60 shown in FIG.

The main terms shown in the embodiments respectively correspond to the following elements of the temperature responsive valve having the cleaning means according to the present application.
Valve 2 ・ ・ ・ Adjustment valve Center rod 4 ・ ・ ・ Interlocking part Center rod 4, Downstream blade 8 ・ ・ ・ Cleaning means Downstream blade 8 ・ ・ ・ Stripped part Valve shaft 10 ・ ・ ・ Adjustment means Valve casing 21 ・ ・ ・Main body Valve chamber 53, valve seat upstream chamber 61 ・ ・ ・ Valve space Bottom chamber 54, valve seat downstream chamber 63 ・ ・ ・ Discharge space Valve port 62 ・ ・ ・ Valve valve seat downstream chamber 63 ・ ・ ・ Discharge chamber Ceiling surface 63a・ ・ ・ Top side wall 63b ・ ・ ・ Side drain ・ ・ ・ Fluid Temperature control trap ・ ・ ・ Temperature responsive valve

[First Embodiment]
A first embodiment of a temperature responsive valve having a cleaning unit according to the present invention will be described with a temperature control trap as an example. The temperature control trap is provided at the end of the trace heat transfer tube and has a function of keeping the trace heat transfer tube at a set temperature. The trace heat transfer tube kept at a fixed set temperature is used as a trace for preventing solidification of a highly viscous fluid such as heavy oil and a trace for preventing freeze of instrumentation equipment.

(Description of the configuration of the temperature control trap)
FIG. 1 is a cross-sectional view of the temperature control trap according to the present embodiment. The valve casing 21 is provided with an inlet 26 and an outlet 29, and a casing lid 22 is attached to the upper part by screw connection. The inlet 26 is connected to the end of a trace heat transfer tube (not shown), and the outlet 29 is connected to a discharge tube (not shown). A valve chamber 53 is formed in the valve casing 21, and the valve chamber 53 communicates with the inflow port 26 via the inflow path 27.

  A valve seat 60 is attached and fixed to the bottom chamber 54 located below in the valve casing 21 by screw connection. 3 and 4 are enlarged views of the vicinity of the valve seat 60. FIG. In the valve seat 60, a valve seat upstream chamber 61 is formed on the upstream side of the valve port 62, and a valve seat downstream chamber 63 is formed on the downstream side. The diameter of the valve port 62 formed as an opening is configured to be smaller than the diameter of the valve seat upstream chamber 61 and the valve seat downstream chamber 63. The valve chamber 53 communicates with the outlet 29 through the valve chamber upstream chamber 61, the valve port 62, the valve seat downstream chamber 63, the bottom chamber 54, and the outflow passage 28.

  As shown in FIGS. 3 and 4, the valve seat downstream chamber 63 is formed with a ceiling surface 63a continuous with the valve port 62 and a side wall 63b continuous with the ceiling surface 63a. The ceiling surface 63a has a substantially conical shape inclined from the valve port 62 toward the side wall 63b, and the side wall 63b has a cylindrical shape.

  A cylindrical screen 70 (FIG. 1) for capturing foreign matter is provided in the valve chamber 53. The steam or drain flowing from the inflow port 26 passes through the screen 70 through the inflow path 27 and flows into the valve chamber 53 in the direction of arrow 101.

  The valve shaft 10 is disposed in the valve chamber 53. FIG. 2 is a view of the valve shaft 10 as viewed from the front end side (downstream side). On the tip side of the valve shaft 10, an upstream blade 10b having a thin rectangular parallelepiped shape and a corner portion configured as a blade is integrally formed, and a valve having a conical shape is provided at the tip of the upstream blade 10b. The body 2 is formed integrally. The upstream blade 10b and the valve element 2 are located in the valve seat upstream chamber 61.

  In the present embodiment, a center rod 4 is fixed to the vertex of the valve body 2, and the center rod 4 is disposed so as to pass through the valve port 62. In addition, since the center rod 4 is formed thinner than the valve port 62, the flow of the drain in the valve port 62 is not obstructed. Further, a downstream blade 8 is further integrally fixed to the tip of the center rod 4, and the downstream blade 8 is located in the valve seat downstream chamber 63. The downstream blade 8 has a thin planar shape and, like the upstream blade 10b, has a corner formed as a blade.

  The downstream blade 8 has a shape corresponding to a cross-sectional shape of the valve seat downstream chamber 63 along the cylindrical axis direction. That is, the downstream blade 8 has a top blade 8a and a side blade 8b, the top blade 8a of the downstream blade 8 is inclined, and the inclination angle is the same as the inclination angle of the ceiling surface 63a of the valve seat downstream chamber 63. . The width of the downstream blade 8 corresponds to the cylindrical diameter of the valve seat downstream chamber 63.

  An adjusting rod 35 is arranged at the rear end of the valve shaft 10. The adjusting rod 35 is screw-coupled to the casing lid 22 via an O-ring 36, and a screwdriver or the like can be screwed into the operating groove 35c formed on the upper part by fitting a tool such as a screwdriver. . The adjustment position of the adjustment rod 35 with respect to the casing lid 22 is fixed by a lock nut 89. Further, an adjustment space 35b is formed in the adjustment rod 35 along the axial direction, and the rear end of the valve shaft 10 is inserted and positioned in the adjustment space 35b. The upper part of the adjusting rod 35 protruding from the casing lid 22 is covered with a protective cap 37.

  A connecting rod 10a is fixed near the rear end of the valve shaft 10. On the other hand, a slide groove 35a formed in a split shape is provided below the adjustment rod 35, and the connecting rod 10a of the valve shaft 10 is inserted into the slide groove 35a. That is, although the valve shaft 10 rotates integrally according to the screwing operation of the adjusting rod 35, the valve shaft 10 can also independently move in the directions of the arrows 105 and 106 along the slide groove 35a.

  The adjusting rod 35, the valve shaft 10 and the valve seat 60 are arranged on the same axis, and the valve body 2 of the valve shaft 10 is located toward the valve port 62. A spring receiver 10c is fixed near the center of the valve shaft 10. The valve stem 10 penetrates the center hole of the container-shaped intermediate member 75, and the intermediate member 75 is in contact with the lower side of the spring receiver 10c. The outside of the intermediate member 75 is curved, and a return spring 71 is attached to the inside of the curve between the intermediate member 75 and the bottom of the valve chamber 53. That is, the valve shaft 10 is constantly urged in the direction of the arrow 105 by the return spring 71 via the intermediate member 75 and the spring receiver 10c.

  A bimetal laminate 40 is attached to the valve shaft 10. The upper surface of the bimetal laminate 40 contacts the lower end surface 35d of the adjustment rod 35, and the lower surface of the bimetal laminate 40 contacts the intermediate member 75 with the flat washer 73 interposed therebetween. The bimetal laminate 40 is formed by laminating a plurality of bimetals, which are temperature-sensitive members that are deformed in response to the surrounding temperature, and are arranged along the axial direction of the valve shaft 10 when the surrounding temperature increases. It expands and contracts along the axial direction when the ambient temperature decreases. FIG. 1 shows a state where the bimetal laminate 40 is expanded.

  A valve element biasing spring 72 attached to the valve shaft 10 is disposed inside the intermediate member 75. The upper part of the valve element biasing spring 72 contacts the flat washer 73, and the lower part contacts the upper side of the spring receiver 10c via the washer 85.

(Explanation of operation of temperature control trap)
Next, the operation of the temperature control trap will be described. In the initial stage, the inside of the valve chamber 53 is filled with air, and the bimetal laminate 40 is contracted. Then, the valve shaft 10 is in a state in which the spring receiver 10c is moved by the return spring 71 in the direction of the arrow 105 (not shown). At this time, the valve element 2 also retreats from the valve port 62 in the direction of the arrow 105, and the valve port 62 is opened.

  When the piping system starts transferring steam, drain flows in from the inlet 26 through the trace heat transfer tube. The drain in the initial stage has a low temperature, and this drain pushes air from the valve port 62 and exhausts the air to the outlet 29 in the direction of the arrow 102. Subsequently, the low-temperature drain is drained from the outlet 29 along the same route.

  Thereafter, the high-temperature drain heated by the high-temperature steam flows into the valve chamber 53. The rise in the temperature of the drain in the valve chamber 53 causes the bimetal laminate 40 to gradually expand. The expanding bimetallic laminate 40 presses the spring receiver 10c of the valve rod 10 in the direction of arrow 106 via the flat washer 73, the valve element biasing spring 72, and the washer 85. At this time, since the relatively strong valve element biasing spring 72 does not contract, the expansion of the bimetal laminate 40 is transmitted to the valve shaft 10 as it is, the valve element 2 enters the valve port 62, and the valve port 62 is closed. I do. At this time, the return spring 71 is pressed by the expansion of the bimetal laminate 40 and compressed.

  By closing the valve port 62, drainage of the drain is stopped, and the drain at the set reference temperature stays in the valve chamber 53 and the trace heat transfer tube. Thereby, the trace heat transfer tube heats a heating target such as a heavy oil transport tube. Thereafter, due to heat exchange with the heating target, the temperature of the drain in the trace heat transfer tube gradually decreases, and the temperature of the drain in the valve chamber 53 also falls below the reference temperature.

  The bimetal laminate 40 starts contracting in response to the temperature decrease of the drain. By the contraction of the bimetal laminate 40, the return spring 71 expands and returns, pushes up the spring receiver 10c of the valve shaft 10 via the intermediate member 75, the valve shaft 10 moves in the direction of the arrow 105, and the valve 2 The valve port 62 is opened. As a result, the drain below the reference temperature is drained to the outlet 29 through the valve port 62. Thereafter, the high-temperature drain flows into the valve chamber 53, and the valve port 62 is closed again by the expansion of the bimetal laminate 40, so that the reference-temperature drain stays.

  As described above, the bimetal laminate 40 expands and contracts in response to the temperature of the drain in the valve chamber 53, whereby the valve body 2 of the valve shaft 10 moves up and down, and the valve port 62 opens and closes. Is repeated to keep the drain in the valve chamber 53 and the trace heat transfer tube at the set reference temperature.

  Incidentally, even after the bimetal laminate 40 expands and the valve body 2 completely closes the valve port 62, the temperature of the drain continues to rise, and in response to this, the bimetal laminate 40 may further expand. In this case, the valve urging spring 72 contracts together with the return spring 71 to absorb the expansion of the bimetal laminate 40 in order to avoid an excessive burden on the bimetal laminate 40.

  The reference temperature of the drain in the valve chamber 53 and the trace heat transfer tube can be freely adjusted and set. To adjust the reference temperature, remove the protective cap 37 at the top of the temperature control trap, loosen the lock nut 89, insert a tool such as a screwdriver into the operation groove 35c, screw it in, and operate the adjustment rod 35. Move in the axial direction.

  If the adjustment rod 35 is tightened into the valve chamber 53, the end surface 35d of the adjustment rod 35 presses the bimetal laminate 40, and the position of the valve shaft 10 itself moves downward in the direction of the arrow 106. Can be set lower. Conversely, if the adjusting rod 35 is loosened, the position of the valve shaft 10 itself moves upward in the direction of the arrow 105 due to the urging of the return spring 71, so that the reference temperature can be set higher.

(Description of cleaning operation)
Foreign substances such as rust and scale adhere to and accumulate on the valve port 62 and the vicinity thereof in the valve chamber 53 due to the operation of the temperature control trap. In the present embodiment, the adjustment rod 35 and the valve shaft 10 are movable to set the reference temperature, and the adjustment rod 35 is screwed in to remove foreign matter and perform cleaning.

  When cleaning the valve seat upstream chamber 61, the protective cap 37 on the temperature control trap is removed, the lock nut 89 is loosened, and a tool such as a screwdriver is fitted into the operation groove 35c. Then, when the adjusting rod 35 is tightened, the valve shaft 10 rotates down through the connecting rod 10a in the direction of the arrow 106 while rotating, and the upstream blade 10b rotates to remove foreign matter adhering to the inner surface of the valve seat upstream chamber 61. Drop and remove.

  FIG. 3 shows a state in which the adjusting rod 35 is tightened to the limit. As the upstream blade 10b of the valve shaft 10 scrapes off foreign matter on the side wall of the valve seat upstream chamber 61, the blade at the tip of the valve seat upstream chamber 61 comes into contact with the bottom surface of the valve seat upstream chamber 61, and also removes foreign matter on the bottom face. .

  If the adjusting rod 35 is loosened in the reverse direction from this state, the upstream blade 10b rises in the direction of the arrow 105 while rotating in the reverse direction, and the remaining foreign matter is scraped off. The scraped-off foreign matter is discharged from the outflow passage 28 together with the drain and the like through the valve port 62.

  Incidentally, the foreign matter may adhere to the valve seat upstream chamber 61, but often adhere to the valve seat downstream chamber 63 located downstream of the valve port 62. In the present embodiment, cleaning is performed by removing foreign matter adhering to the inside of the valve seat downstream chamber 63 with the downstream blade 8 by the screwing operation of the adjusting rod 35.

  When cleaning the inside of the valve seat downstream chamber 63, the protection cap 37 on the upper part of the temperature control trap shown in FIG. 1 is removed, the lock nut 89 is loosened, and a tool such as a screwdriver is fitted into the operation groove 35c. Then, when the adjusting rod 35 is loosened, the valve shaft 10 rises in the direction of the arrow 105 while rotating via the connecting rod 10a, and the downstream blade 8 rotates near the inner surface of the valve seat downstream chamber 63.

  FIG. 4 shows a state in which the adjusting rod 35 is loosened to the limit. The top blade 8a of the downstream blade 8 is in contact with the ceiling surface 63a of the valve seat downstream chamber 63. In the process of reaching this state, the side blade 8b of the downstream blade 8 removes foreign matter adhered to the side wall 63b of the valve seat downstream chamber 63, and the top blade 8a of the downstream blade 8 adheres to the ceiling surface 63a of the valve seat downstream chamber 63. The foreign matter that has been removed is removed.

  Then, when the adjustment rod 35 is tightened in the reverse direction from this state, the downstream blade 8 descends in the direction of the arrow 106 while rotating in the reverse direction, and the remaining foreign matter is scraped off. The scraped foreign matter is discharged from the outflow passage 28 together with the drain and the like.

  After removing the foreign matter, the adjustment rod 35 shown in FIG. 1 is adjusted to a height corresponding to a predetermined reference temperature and positioned. Thereafter, the position is fixed with the lock nut 89, the protective cap 37 is attached, and the cleaning process is completed.

[Other embodiments]
In the above-described embodiment, the configuration in which the downstream blade 8 cleans only the valve seat downstream chamber 63 has been described. When the blade performs the cleaning operation of the valve seat downstream chamber 63, the blade may enter the valve port 62 and simultaneously scrape off the foreign matter attached to the inner periphery of the valve port 62.

  Further, in the above-described embodiment, an example in which the temperature responsive valve having the cleaning means according to the present invention is applied to the temperature control trap is described, but other types that open and close the valve in response to the temperature are used. May be applied to the valve.

  Further, in the above-described embodiment, the valve seat downstream chamber 63 has been exemplified as the discharge chamber. Can be adopted. In addition, as the exfoliated portion, the downstream blade 8 having a shape corresponding to the shape of the valve seat downstream chamber 63 has been exemplified, but any other shape and structure may be used as long as it rotates close to the inner surface of the discharge chamber. Can be used.

  Also, as the interlocking part, the center rod 4 disposed through the valve port 62 has been illustrated, but the present invention is not limited to this, and is directly or indirectly interlocked with the rotating operation of the adjusting means (such as the valve shaft 10). Other configurations can also be adopted as long as they rotate the exfoliation section (the downstream blade 8 and the like).

2: Valve body 4: Center rod 8: Downstream blade 10: Valve shaft 21: Valve casing
53: Valve room 54: Bottom room 61: Valve seat upstream room 62: Valve port 63: Valve seat downstream room
63a: Ceiling surface 63b: Side wall

Claims (2)

A body connected to a piping system for transferring a fluid, the body having a valve space and a discharge space,
A valve hole as an opening formed in the main body and communicating the valve space and the discharge space,
Adjusting means having an adjusting valve located in the valve space, wherein the adjusting valve advances or retreats with respect to the valve hole along the rotation axis direction in response to the rotation operation or the temperature of the fluid, and Adjusting means for changing the degree of the opening,
A temperature responsive valve having cleaning means comprising:
A cleaning unit having a shaving unit located in the discharge space, and an interlocking unit that rotates the shaving unit in proximity to the inner surface of the discharge space in conjunction with the rotation operation of the adjusting unit;
A temperature-responsive valve having cleaning means, comprising: A temperature responsive valve having a cleaning means according to claim 1,
A discharge chamber formed in the discharge space, an upper surface formed continuously with the valve hole, and a discharge chamber having side surfaces formed continuously with the upper surface,
With
The interlocking part is located through the valve hole, connects the adjusting means and the exfoliation part,
The shaved portion has a shape corresponding to the discharge chamber, and rotates in proximity to the upper surface and side surfaces of the discharge chamber according to the rotation operation.
A temperature-responsive valve having cleaning means.

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