JP2022191927A - Automatic valve with cleaning mechanism - Google Patents

Abstract

To provide an automatic valve with a cleaning mechanism capable of removing foreign matter by surely turning a valve stem.SOLUTION: When drain at high temperature flows into a valve chamber 53, each bimetal 50 is expanded; a valve stem 10 is moved in a direction of an arrow 106, and a valve element 2 enters a valve port 62 so as to close a valve. The valve stem 10 is constituted by a valve stem body 11 and a valve stem end portion 12, and they are connected with each other at a connection portion 4. A body side tooth portion formed on the valve stem body 11 and an end side tooth portion formed on the valve stem end portion 12 are separated from each other by a return spring incorporated in the valve stem body 11 when the valve is opened, and an apex of the body side tooth portion and an apex of the end side tooth portion are dislocated circumferentially. Accordingly, when the valve is opened at which the valve stem 10 is moved in the direction of the arrow 106, the valve stem end portion 12 is turned by meshing of the body side tooth portion and the end side tooth portion, and foreign matter fixed to a valve seat upstream chamber 61 is scraped off and removed by a blade portion 10b.SELECTED DRAWING: Figure 1

Description

An automatic valve having a cleaning mechanism according to the present application relates to a cleaning technique for cleaning foreign matter adhering to the inside of an automatic valve such as a temperature control trap.

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

However, in some cases, a temperature control trap as an automatic valve is used instead of the steam trap in order to retain the drain in the branch pipe and adjust 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, if the temperature drops, the heavy oil or the like will solidify. For this reason, a branch pipe through which high-temperature steam or drain flows is arranged along the transport pipe to function as a trace heat transfer pipe, and heat is exchanged with the transport pipe for the heavy oil, etc. to raise the temperature of the heavy oil, etc. and prevent solidification.

Here, for example, in the case of heavy oil, a temperature of about 40 degrees is sufficient for transportation, but the temperature of the steam is over 100 degrees, so if the steam is used as a heat source for the trace heat transfer tube, the temperature of the heavy oil will rise. There is too much danger. Therefore, a temperature control trap is provided at the end of the trace heat transfer tube to adjust the temperature of the trace heat transfer tube to an appropriate set temperature.

A temperature control trap provided at the end of the trace heat transfer tube is formed with a valve chamber into which steam or drain flows from the trace heat transfer tube, 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 as the upstream side and the discharge chamber side as the downstream side.

In the valve chamber, a valve shaft having a valve element provided at its tip (lower end) is arranged. The valve body at the tip is positioned toward the valve opening, and a bimetal laminate as a temperature-sensitive member is attached to the valve shaft.

When high-temperature drain flows into the valve chamber, the bimetal laminate expands in response to the high temperature, moving the valve shaft in the axial direction, and the valve body at the tip closes the valve port. After that, when the temperature of the drain drops due to heat exchange with the object to be heated, the bimetal laminate contracts in response to this temperature drop, the valve shaft moves according to the expansion of the return spring, and the valve body opens the valve opening. The low-temperature drain is discharged to the discharge chamber side. In this way, the opening and closing of the valve opening are repeated based on the displacement of the valve shaft, and the temperature of the trace heat transfer tube is kept at a constant reference temperature.

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

By the way, foreign matter such as rust and scale (scale) may flow into the valve chamber of the temperature control trap together with steam and drain. When such foreign matter adheres and accumulates in the vicinity of the valve port, the foreign matter obstructs the flow rate of the drain, making it impossible to properly adjust the temperature of the trace heat transfer tube. In particular, the valve opening of the temperature control trap is formed to have a narrow opening in order to finely adjust the flow rate of the drain, so the influence of adhesion of foreign matter is great.

As a cleaning technique for removing foreign matter adhering to the vicinity of the valve opening, there is a technique disclosed in Patent Document 1 described later. In this technique, a valve opening 8 is provided in a valve chamber 5 formed by valve casings 3 and 4, and a valve shaft 12 is arranged in the valve chamber 5. As shown in FIG. A blade 15 and a valve body 13 are integrally provided at the tip of the valve shaft 12 .

As the valve shaft 12 moves in the axial direction, the valve body 13 provided at the tip of the valve shaft 12 opens and closes the valve opening 8 . The valve shaft 12 moves in the axial direction according to the deformation action of the bimetal laminate 26 as the temperature sensing member. A toothed member 30 is provided on the valve stem 12, and toothed members 33 and 34 are arranged above and below the toothed member 30. As shown in FIG. When the valve shaft 12 moves in the axial direction, the toothed member 30 and the one-toothed members 33, 34 are engaged with each other to rotate the blade 15 provided at the tip of the valve shaft 12, thereby removing the foreign matter adhering to the vicinity of the valve opening 8. Cutlery 15 is removed.

JP 2013-245749 A

In the technique disclosed in the aforementioned Patent Document 1, the tooth member 30 provided on the valve shaft 12 and the one-tooth members 33 and 34 arranged above and below the tooth member 33 and 34 are completely aligned in the circumferential direction. In this case, even if the valve shaft 12 moves in the axial direction, there is no rotational movement, and there is a risk that the foreign matter adhering to the vicinity of the valve opening 8 cannot be removed by the blade 15 provided at the tip of the valve shaft 12. There is

Therefore, the automatic valve having a cleaning mechanism according to the present application has been made in view of these circumstances, and provides an automatic valve having a cleaning mechanism that can remove foreign matter by reliably rotating the valve shaft. With the goal.

An automatic valve having a cleaning mechanism according to the present application is
an automatic valve body having a valve chamber space into which fluid flows and a discharge hole communicating with the valve chamber space and discharging the fluid to the outside;
Valve shaft means arranged in the valve chamber space along a reference line and capable of reciprocating movement in the direction of the reference line, the sliding portion cleaning the vicinity of the discharge hole and opening and closing the discharge hole valve stem means having a valve body;
opening and closing means for reciprocating the valve shaft means;
An automatic valve having a cleaning mechanism comprising
The valve shaft means comprises an operating portion having a sliding portion and a valve body portion, and a valve shaft body portion,
The actuating portion is connected to the valve shaft main body portion by a connecting shaft in such a state that it can approach or separate along the reference line direction and can rotate in the circumferential direction with respect to the reference line,
Either the operating portion or the valve shaft body portion is provided with a guide inclined surface that is inclined in an oblique direction from the apex of the inclination toward the end point of the inclination with respect to a reference line. A contact portion that can contact the guide inclined surface is formed on the other side of the body portion,
When the valve is opened, the operating portion and the valve shaft body portion are arranged such that the positional relationship in the reference line direction between the contact portion and the inclined apex of the guide slope is shifted in the circumferential direction,
When the valve is closed, the operating portion and the valve stem body portion approach each other, so that the contact portion moves while being guided by the guide inclined surface while coming into contact with the guide inclined surface, and the operating portion moves toward the reference position. rotating in the circumferential direction about a line;
It is characterized by

In the automatic valve having the cleaning mechanism according to the present application, when the valve is opened, the actuating portion and the valve shaft main body are arranged so that the positional relationship in the reference line direction between the contact portion and the apex of the inclined guide slope is displaced in the circumferential direction. are placed. When the valve is closed, the operating portion and the valve shaft main body come closer to each other, so that the contact portion moves while being guided by the guide inclined surface while contacting the guide inclined surface, and the operating portion moves relative to the reference line. It rotates in the circumferential direction. Therefore, the foreign matter can be reliably removed by rotating the valve shaft means.

1 is a cross-sectional view of a temperature control trap showing a first embodiment of an automatic valve having a cleaning mechanism according to the present application; FIG. 2 is an enlarged view of the vicinity of a connecting portion 4 of the valve stem 10 shown in FIG. 1. FIG. 3 is a cross-sectional view of the valve shaft 10 shown in FIG. 2. FIG.

The main terms shown in the embodiments correspond to the following elements of the automatic valve with cleaning mechanism according to the present application, respectively.
Valve disc 2...Valve disc portion Valve shaft 10...Valve shaft means Blade portion 10b...Sliding portion Valve shaft main body 11...Valve shaft main body Valve shaft tip portion 12...Operating portion Valve casing 21 and casing lid 22 Automatic valve main body Connecting shaft 40 Connecting shaft Vertices 41a, 42a Tilt apex End points 41b, 42b Tilt end point Either the main body side slope portion 41c or the tip side slope portion 42c One of the guide inclined surfaces The other of the body-side inclined surface 41c and the tip-side inclined surface 42c Contact portion Return spring 49 Bimetal 50 and return spring 71 Opening/closing means Valve chamber 53 and valve seat upstream chamber 61...Valve chamber space Valve opening 62...Exhaust hole Arrows 105, 106...Reference line direction Arrow 108...Rotating direction Arrow 109...opposite to the rotating direction Direction Center line L1・・・Reference line Drain・・・Fluid Temperature control trap・・・Automatic valve

[First embodiment]
A first embodiment of an automatic valve having a cleaning mechanism according to the present application will be described using a temperature control trap as an example. A 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. Trace heat transfer tubes, which are kept at a constant set temperature, are used as anti-coagulation traces for high-viscosity fluids such as heavy oil, and anti-freezing traces for instrumentation equipment.

(Description of the configuration of the temperature control trap)
FIG. 1 is a sectional view of a temperature control trap in this embodiment. The valve casing 21 is provided with an inflow port 26 and an outflow port 29, and a casing lid 22 is attached to the upper portion by screw connection with a gasket 39 interposed therebetween. The inlet 26 is connected to the end of a trace heat transfer tube (not shown) and the outlet 29 is connected to an outlet tube (not shown). An internal space defined by the valve casing 21 and the casing lid 22 is formed as a valve chamber 53 , and the valve chamber 53 communicates with the inflow port 26 via the inflow passage 27 .

A valve seat 60 is attached and fixed to the bottom chamber 54 positioned below in the valve casing 21 by screw connection. The valve seat 60 has a valve seat upstream chamber 61 formed on the upstream side of the valve port 62 and a valve seat downstream chamber 63 formed on the downstream side. The diameter of the valve port 62 formed as an opening is configured to be smaller than the diameters of the valve seat upstream chamber 61 and the valve seat downstream chamber 63 . The valve chamber 53 communicates with the outflow port 29 via the valve seat upstream chamber 61 , the valve port 62 , the valve seat downstream chamber 63 , the bottom chamber 54 and the outflow path 28 .

A tubular screen 70 is provided in the valve chamber 53 . The steam or drain that has flowed in from the inflow port 26 passes through the inflow passage 27, passes through the screen 70, and flows into the valve chamber 53 in the direction of the arrow 101. As shown in FIG. When passing through the screen 70, the screen 70 captures foreign matter mixed in the steam and drain.

A valve shaft 10 is arranged in the valve chamber 53 . In FIG. 1, the valve stem 10 is shown as a side view rather than a cross section. The axis of the valve shaft 10 coincides with the center line L1, and the valve shaft 10 is held so as to be able to reciprocate in the directions of arrows 105 and 106 along the center line L1. In this embodiment, the valve shaft 10 is composed of a valve shaft main body 11 and a valve shaft distal end portion 12 , and the valve shaft main body 11 and the valve shaft distal end portion 12 are connected by a connecting portion 4 .

FIG. 2 is an enlarged view of the vicinity of the connecting portion 4, and FIG. 3 is a sectional view thereof. A plurality of body-side teeth 41 are continuously formed at the lower end of the valve shaft main body 11 (the tip in the direction of arrow 106), and a plurality of tips are formed at the upper end of the valve shaft tip portion 12 (the tip in the direction of arrow 105). A side tooth portion 42 is formed continuously. Both the body-side tooth portion 41 and the tip-side tooth portion 42 have substantially right-angled triangular shapes, and have shapes that mesh with each other. The body-side tooth portion 41 has a body-side inclined portion 41c formed linearly between the vertex 41a and the end point 41b, and the tip-side tooth portion 42 is linearly formed between the vertex 42a and the end point 42b. It is provided with a tip-side inclined portion 42c formed in the .

As shown in FIG. 3, a connection shaft 40 is integrally formed at the upper end of the valve stem tip portion 12 . A valve shaft inner space 46 is formed at the lower end (tip in the direction of arrow 106) of the valve shaft main body 11, and this valve shaft inner space 46 opens toward the bottom. The diameter of the opening is configured to be smaller than the inner diameter of the valve stem internal space 46 .

The connection shaft 40 is inserted into the valve shaft internal space 46 from the opening at the bottom. A locking portion 45 is fixed to the upper end of the connection shaft 40 (the tip in the direction of arrow 105). Since the locking portion 45 has a size approximately equal to the inner diameter of the valve shaft inner space 46, the connecting shaft 40 is positioned inside the valve shaft when the locking portion 45 comes into contact with the opening at the bottom of the valve shaft inner space 46. It is designed not to leave the space 46.

A return spring 49 is built in the valve shaft inner space 46 , and one end 49 a of the return spring 49 is fixed to the ceiling surface of the valve shaft inner space 46 , and the other end 49 b is fixed to the upper surface of the locking portion 45 . ing. The valve shaft tip 12 is always biased against the valve shaft main body 11 in the direction of arrow 106 by the return spring 49, and when the valve is opened, the valve shaft main body 11 and the valve shaft tip 12 are separated as shown in FIG. They are separated from each other, and a gap is formed between the main body side tooth portion 41 and the tip side tooth portion 42 . The return spring 49 is, for example, a compressible torsion coil spring.

Further, as shown in FIG. 2, when the valve is open, the apex 41a of the main body side tooth portion 41 and the apex 42a of the tip side tooth portion 42 have a length a1 ( 2) is in a positional relationship. As described above, the one end 49a and the other end 49b of the return spring 49 are fixed to the ceiling surface of the valve shaft internal space 46 and the upper surface of the locking portion 45, respectively. A positional relationship in which the body-side tooth portion 41 and the tip-side tooth portion 42 are displaced by a length a1 (FIG. 2) in the circumferential direction is maintained in a free state.

As shown in FIG. 1, the lower end (the tip in the direction of the arrow 106) of the valve stem tip portion 12 has a thin rectangular parallelepiped shape, and a blade portion 10b having a corner portion configured as a blade is integrated therewith. is formed in Further, a conical valve body 2 is integrally formed at the lower end (tip in the direction of arrow 106) of this blade portion 10b. The blade portion 10b and the valve body 2 are positioned within the valve seat upstream chamber 61. As shown in FIG.

An adjusting rod 35 is arranged above the valve shaft 10 . The adjustment rod 35 is screwed to the casing lid 22 via an O-ring 36, and can be screwed by inserting a tool such as a screwdriver into an operation groove 35c formed on the top. . The adjustment position of the adjustment rod 35 with respect to the casing lid 22 is fixed by a lock nut 89. As shown in FIG. 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 into the adjustment space 35b. The upper portion of the adjusting rod 35 protruding from the casing lid 22 is covered with a protective cap 37. As shown in FIG.

A connecting rod 10a is fixed to the upper portion of the valve shaft 10. As shown in FIG. On the other hand, a slide groove 35a formed in a split shape is provided in the lower portion of the adjustment rod 35, and the connecting rod 10a of the valve shaft 10 is inserted into the slide groove 35a. That is, the valve shaft 10 is integrally rotated according to the screwing operation of the adjusting rod 35, but it is also possible for the valve shaft 10 to move independently in the directions of the arrows 105 and 106 along the slide groove 35a.

The axes of the adjusting rod 35 and the valve seat 60 are also arranged coaxially so as to coincide with the center line L1 like the valve shaft 10, and the valve body 2 of the valve shaft 10 is arranged facing the valve port 62. A spring bearing 10c is fixed to the valve shaft main body 11 of the valve shaft 10. As shown in FIG. The valve shaft main body 11 of the valve shaft 10 passes through 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 bearing 10c. The intermediate member 75 has a curved outer side, and a return spring 71 is attached between the curved inner side 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 bearing 10c.

A bimetal 50 for moving the valve shaft 10 in the arrow 106 direction is attached to the valve shaft body 11 of the valve shaft 10 . In this embodiment, five bimetals 50 are laminated to form a laminate. The top surface of the uppermost bimetal 50 contacts the lower end surface 35d of the adjusting rod 35, and the lower surface of the lowermost bimetal 50 contacts the intermediate member 75 with the plain washer 73 interposed therebetween. Each bimetal 50 is a temperature-sensitive member that deforms in response to ambient temperature. It shrinks along the axial direction when: FIG. 1 shows a state in which each bimetal 50 has expanded and the valve shaft 10 has moved to the limit position in the direction of arrow 106 .

A valve body biasing spring 72 attached to the valve shaft 10 is arranged inside the intermediate member 75 . The upper portion of the valve body biasing spring 72 abuts on the plain washer 73, and the lower portion abuts on the upper side of the spring bearing 10c via a washer 85. As shown in FIG.

(Explanation of basic operation of temperature control trap)
Next, the basic operation of this temperature control trap will be described. At the initial stage, the valve chamber 53 is filled with air and each bimetal 50 is contracted. The spring bearing 10c of the valve shaft 10 is biased by the return spring 71 and moved in the direction of the arrow 105 (not shown). At this time, the valve body 2 is also withdrawn from the valve port 62 in the direction of the arrow 105, and the valve port 62 is opened.

When the piping system starts to transfer steam, drain flows in the direction of the arrow 101 from the inlet 26 through the trace heat transfer tubes. The drain at the initial stage has a low temperature, and this drain pushes air out of the valve port 62 and exhausts it to the outflow port 29 in the direction of the arrow 102 . Subsequently, the low-temperature drain is discharged from the outflow port 29 along the same path.

After that, high-temperature drain heated by high-temperature steam flows into the valve chamber 53 . As the temperature of the drain in the valve chamber 53 rises, each bimetal 50 gradually expands. The stack of expanding bimetals 50 presses the spring receiver 10c of the valve stem 10 in the direction of arrow 106 via the flat washer 73, the valve body biasing spring 72 and the washer 85. As shown in FIG. At this time, since the relatively strong valve body biasing spring 72 does not contract, the expansion of the laminated body of the bimetal 50 is directly transmitted to the valve shaft 10, and the valve body 2 enters the valve opening 62 to close the valve opening 62. speak up. At this time, the return spring 71 is pressed and compressed by the expansion of the bimetal laminate 50 .

By closing the valve port 62, the 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 pipe. As a result, the trace heat transfer pipe heats a heating target such as a heavy oil transport pipe. After that, due to heat exchange with the object to be heated, 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 drops below the reference temperature.

Each bimetal 50 starts contracting in response to the temperature drop of the drain. Due to the contraction of each bimetal 50, the return spring 71 expands and returns, pushes up the spring bearing 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 body 2 moves toward the valve. The mouth 62 is opened. As a result, the drain whose temperature is lower than the reference temperature is discharged to the outflow port 29 through the valve port 62 . After that, the high-temperature drain flows into the valve chamber 53, and the expansion of each bimetal 50 closes the valve port 62 again, and the drain at the reference temperature stays.

As described above, each bimetal 50 expands and contracts in response to the temperature of the drain in the valve chamber 53, so that the valve element 2 of the valve stem 10 moves up and down, and the valve opening 62 opens and closes the valve. Repeatedly, the valve chamber 53 and the drain in the trace heat transfer tube are kept at the set reference temperature.

Even after each bimetal 50 expands and the valve body 2 completely closes the valve port 62, the temperature of the drain continues to rise, and each bimetal 50 may expand further in response to this. In this case, in order to avoid an excessive load on the bimetal 50, the valve body biasing spring 72 contracts to allow the valve shaft 10 to move in the direction of the arrow 105, thereby absorbing the expansion of the bimetal 50.

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 on the upper side of the casing lid 22, loosen the lock nut 89, insert a tool such as a screwdriver into the operating groove 35c, and screw the adjustment rod. Move 35 axially.

When the adjusting rod 35 is tightened toward the inside of the valve chamber 53, the end surface 35d of the adjusting rod 35 presses the stack of bimetals 50, and the position of the valve shaft 10 moves downward in the direction of the arrow 106. can be set lower. Conversely, when the adjusting rod 35 is loosened, the bias of the return spring 71 causes the position of the valve stem 10 itself to move upward in the direction of the arrow 105, so that the reference temperature can be set higher.

(Description of cleaning operation)
A screen 70 is provided in the valve chamber 53 for catching foreign matter mixed in the steam and drain. adheres and deposits in the vicinity of In particular, it often accumulates at the bottom of the valve seat upstream chamber 61 and becomes clumped. In this embodiment, the valve closing operation by moving the valve shaft 10 in the direction of the arrow 106 is used to automatically scrape off and remove the foreign matter.

As described above, high-temperature drain flows into the valve chamber 53 in the direction of the arrow 101 and the bimetals 50 expand, thereby moving the valve shaft 10 in the direction of the arrow 106 and causing the valve body 2 to enter the valve port 62. Close the valve. Immediately after the valve body 2 closes the valve, the tip of the blade portion 10b of the valve shaft 10 is in contact with the bottom of the valve seat upstream chamber 61. As shown in FIG. 2, it is separated from the tip-side teeth 42 of the valve shaft tip 12 to form a gap.

From this state, each bimetal 50 continues to expand, and the valve stem body 11 moves in the arrow 106 direction. At this time, since the tip of the blade portion 10b is in contact with the bottom of the valve seat upstream chamber 61, the valve stem tip portion 12 does not move. is compressed in the direction of the center line L1, the gap between the main body side tooth portion 41 and the tip side tooth portion 42 gradually becomes smaller, and the main body side tooth portion 41 and the tip side tooth portion 42 are completely meshed. . FIG. 1 shows this cleaning state.

In the process from the valve open state shown in FIG. 2 to the cleaning state shown in FIG. 2) rotates in the circumferential direction by a length a2. That is, as described above, when the valve is open, the apex 1a of the main body side tooth portion 41 and the apex 42a of the tip side tooth portion 42 are shifted by a length a1 in the circumferential direction around the center line L1. , the apex 41a of the main body side tooth portion 41 and the apex 42a of the tip side tooth portion 42 move toward the tip side inclined portion 42c and the main body side as the body side tooth portion 41 and the tip side tooth portion 42 approach each other. It is guided while contacting the inclined portion 41c and moves toward the end points 42b and 41b.

As a result, the valve stem tip portion 12 rotates about the center line L1 in the direction of the arrow 108 (FIG. 2) by the length a2. The tip of the blade portion 10b is pressed strongly against the bottom of the valve seat upstream chamber 61, and the valve shaft tip portion 12 rotates in the circumferential direction, thereby removing a lump of foreign matter adhered to the bottom of the valve seat upstream chamber 61. is scraped off and removed. At this time, the foreign matter adhering to the side wall of the valve seat upstream chamber 61 is simultaneously scraped off and removed by the side portion of the blade portion 10b. The removed foreign matter is discharged to the outside from the outflow port 29 together with the drain when the valve port 62 is opened.

Thereafter, the temperature of the drain in the valve chamber 53 drops, causing the bimetals 50 to contract, and the return spring 71 moves the valve stem 10 in the direction of the arrow 105 , causing the valve body 2 to open the valve port 62 . At this time, the valve shaft main body 11 and the valve shaft distal end portion 12 of the valve shaft 10 are separated by the force of the return spring 49. Since it is fixed to the ceiling surface of the shaft inner space 46 and the upper surface of the locking portion 45, the valve shaft tip portion 12 rotates in the direction of the arrow 109 (Fig. 2) around the center line L1 with respect to the valve shaft main body 11. (That is, it rotates in the direction opposite to the direction of the arrow 108), and the connecting portion 4 returns from the state shown in FIG. 1 to the state shown in FIG.

As described above, every time the valve shaft 10 moves in the direction of the arrow 106 to perform the valve closing operation, the blade portion 10b rotates to automatically perform the cleaning operation. Therefore, the foreign matter adhering to the valve seat upstream chamber 61 can be reliably scraped off and removed.

[Other embodiments]
In the above-described embodiment, an example in which the automatic valve having the cleaning mechanism according to the present application is applied to a temperature control trap has been described. , the automatic valve having the cleaning mechanism according to the present application can be applied to automatic valves having other configurations.

Further, in the above-described embodiment, an example in which the body-side tooth portion 41 and the tip-side tooth portion 42 have the same substantially right-angled triangular shape was shown, but the body-side tooth portion 41 or the tip-side tooth portion 42 has a similar shape. Only one of them may be shaped like a substantially right-angled triangle, and the other may be shaped like a protrusion (abutting part) that abuts on one inclined part (a guide inclined surface).

Furthermore, in the above-described embodiment, an example in which the body-side toothed portion 41 and the tip-side toothed portion 42 are arranged continuously has been shown, but they may be arranged intermittently. Further, for example, the number of main body side tooth portions 41 and tip side tooth portions 42 can be reduced, and the inclined surface (guide inclined surface) can be set long. By setting the inclined surface (guide inclined surface) to be long, it is possible to ensure a large rotation length in the circumferential direction of the valve stem tip portion (operating portion).

Further, in the above embodiment, the blade portion 10b was exemplified as the sliding portion, but other shapes and configurations may be adopted as long as they can clean the vicinity of the valve opening 62 (discharging hole).

2: Disc 10: Valve stem 10b: Blade 11: Valve stem body 12: Valve stem tip
21: Valve casing 22: Casing lid 40: Connection shaft 41a, 42a: Top
41b, 42b: end point 41c: main body side sloped portion 42c: tip side sloped portion 49: return spring
50: Bimetal 53: Valve chamber 61: Valve seat upstream chamber 62: Valve port 71: Return spring
105, 106, 108, 109: Arrow L1: Center line

Claims (2)

an automatic valve body having a valve chamber space into which fluid flows and a discharge hole communicating with the valve chamber space and discharging the fluid to the outside;
Valve shaft means arranged in the valve chamber space along a reference line and capable of reciprocating movement in the direction of the reference line, the sliding portion cleaning the vicinity of the discharge hole and opening and closing the discharge hole valve stem means having a valve body;
opening and closing means for reciprocating the valve shaft means;
An automatic valve having a cleaning mechanism comprising
The valve shaft means includes an operating portion having a sliding portion and a valve body portion, and a valve shaft body portion,
The actuating portion is connected to the valve shaft main body portion by a connecting shaft in such a state that it can approach or separate along the reference line direction and can rotate in the circumferential direction with respect to the reference line,
Either the operating portion or the valve shaft body portion is provided with a guide inclined surface that is inclined in an oblique direction from the apex of the inclination toward the end point of the inclination with respect to a reference line. A contact portion that can contact the guide inclined surface is formed on the other side of the body portion,
When the valve is opened, the operating portion and the valve shaft body portion are arranged such that the positional relationship in the reference line direction between the contact portion and the inclined apex of the guide slope is shifted in the circumferential direction,
When the valve is closed, the operating portion and the valve stem body portion approach each other, so that the contact portion moves while being guided by the guide inclined surface while coming into contact with the guide inclined surface, and the operating portion moves toward the reference position. rotating in the circumferential direction about a line;
An automatic valve having a cleaning mechanism characterized by: In an automatic valve having a cleaning mechanism according to claim 1,
biasing means for biasing the operating portion in a direction opposite to a rotating direction in which the operating portion rotates in a circumferential direction with respect to a reference line;
An automatic valve with a cleaning mechanism, comprising:

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