JP6804707B1 - Thermal response valve - Google Patents

Abstract

The heat-responsive valve (100) includes an expansion medium (3), a first diaphragm (41), a second diaphragm (42), a contact portion (5), a valve body (6), and a valve seat (7). .. The second diaphragm (42) and the valve body (6) penetrate the second diaphragm (42) and the valve body (6) and communicate with the valve hole (71) when the valve body (6) is closed. A hole (61) is formed. The contact portion (5) is arranged so as to surround the open end of the through hole (61) in the second diaphragm (42). The contact portion (5) communicates the space (43) between the first diaphragm (41) and the second diaphragm (42) and the through hole (61) in a state of being in contact with the first diaphragm (41). A communication passage (53) is formed.

Description

The technique disclosed herein relates to a thermal response valve.

Conventionally, a heat-responsive valve that opens and closes a valve hole according to the ambient temperature has been known. For example, in Patent Document 1, an expansion medium that expands with temperature, a diaphragm that is deformed by expansion and contraction of the expansion medium, a valve body provided on the diaphragm, and a valve hole are formed at positions facing the valve body. A heat-responsive valve with an arranged valve seat is disclosed.

In the heat response valve disclosed in Patent Document 1, two diaphragms are provided, and one diaphragm partially partitions a storage chamber for accommodating the expansion medium and is in contact with the expansion medium. A valve body is attached to the other diaphragm via an attachment member. Specifically, the valve body is attached to the diaphragm by connecting the valve body and the attachment member with the diaphragm sandwiched between the valve body and the attachment member.

For example, when a relatively high temperature fluid such as steam flows around the heat response valve, the expansion medium expands, thereby deforming the diaphragm, and the valve body sits and closes. On the other hand, when a relatively low-temperature fluid such as a drain flows around the heat-responsive valve, the expansion medium contracts, which deforms the diaphragm, and the valve body separates and opens.

Japanese Unexamined Patent Publication No. 2013-151960

By the way, the heat-responsive valve as described above may be provided with a fail-open function that automatically opens the heat-responsive valve when a problem occurs. Specifically, a through hole is formed in the valve body, the mounting member, and the diaphragm sandwiched between the valve body and the mounting member. When the valve body is seated on the valve seat, the through hole communicates the space between the two diaphragms with the valve hole.

If the diaphragm in contact with the expansion medium is damaged in the closed state (that is, the high temperature fluid is flowing around the thermal response valve), the expansion medium leaks into the space between the two diaphragms, and further. Flows out into the valve hole through the through hole. As a result, the deformation of the diaphragm due to the expansion of the expansion medium is reduced, and the valve body is separated from the valve seat. As a result, the hot fluid flows out through the valve holes. On the other hand, when the diaphragm provided with the valve body is damaged in the valve closed state, the high-temperature fluid flows into the space between the two diaphragms from the damaged portion of the diaphragm, but passes through the through hole to pass through the valve hole. Outflow through. In this way, the hot fluid can pass through the valve hole regardless of which of the two diaphragms is damaged.

In the heat response valve configured as described above, the fail-open function does not function properly unless a fluid such as an expansion medium and a high-temperature fluid flows well from the space between the two diaphragms to the through hole.

The technique disclosed herein has been made in view of this point, and the purpose thereof is to properly function the fail-open function of the heat-responsive valve.

The heat-responsive valve disclosed herein is a first diaphragm that divides an expansion medium that expands in response to temperature and a storage chamber that houses the expansion medium at least partially, and is deformed by expansion and contraction of the expansion medium. A second diaphragm arranged to face the first diaphragm on the outside of the storage chamber, and a second diaphragm on the surface of the second diaphragm facing the first diaphragm, and when the expansion medium is expanded, the first diaphragm is provided. A contact portion that transmits the deformation of the first diaphragm to the second diaphragm by contact with the first diaphragm, and a valve body provided on the surface of the second diaphragm opposite to the surface facing the first diaphragm. The second diaphragm and the valve body include a valve seat in which a valve hole is formed, the valve hole is closed by the valve body when the expansion medium expands, and the valve hole is opened when the expansion medium contracts. Is formed with a through hole that penetrates the second diaphragm and the valve body and communicates the space between the first diaphragm and the second diaphragm and the valve hole when the valve body is closed. The contact portion is arranged so as to surround the open end of the through hole in the second diaphragm, and the contact portion is in contact with the first diaphragm between the first diaphragm and the second diaphragm. A communication passage is formed to communicate the space and the through hole.

According to the heat response valve, the fail-open function of the heat response valve can be appropriately functioned.

FIG. 1 is a cross-sectional view of the drain trap. FIG. 2 is a cross-sectional view of the heat response valve in the valve open state. FIG. 3 is a plan view of the contact portion. FIG. 4 is a cross-sectional view of the heat-responsive valve in the closed state. FIG. 5 is a perspective view of the contact portion according to the modified example.

Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of the drain trap 1.

The drain trap 1 includes a casing 10 in which a flow path 18 through which drain flows is formed, and a heat response valve 100 provided in the flow path 18 for switching between opening and closing of the flow path 18. The heat response valve 100 closes when the ambient temperature is relatively high, while opens when the ambient temperature is relatively low. As a result, the drain trap 1 discharges the fluid (for example, drain) having a temperature lower than the predetermined temperature, while stopping the discharge of the fluid (for example, steam) having a temperature higher than the predetermined temperature.

The casing 10 is formed with an inflow port 12, an outflow port 13, and a valve chamber 14 communicating with each of the inflow port 12 and the outflow port 13. The casing 10 has a main body 10a and a lid 10b attached to the main body 10a.

In the main body 10a, the inflow port 12 and the outflow port 13 are formed on the same axis extending horizontally. The main body 10a is formed with an opening 15 that opens upward. The lid 10b is attached to the main body 10a so as to close the opening 15, and the valve chamber 14 is partitioned by the opening 15 and the lid 10b. The heat-responsive valve 100 is housed in the valve chamber 14. The heat response valve 100 is held in a holder 19 provided in the valve chamber 14.

The main body 10a is formed with a first passage 16 communicating with the inflow port 12 and a second passage 17 communicating the first passage 16 and the opening 15. The inflow port 12 communicates with the valve chamber 14 via the first passage 16 and the second passage 17. A strainer 16a is provided in the first passage 16.

As described above, the flow path 18 is formed by the inflow port 12, the first communication passage 16, the second communication passage 17, the valve chamber 14, and the outflow port 13.

FIG. 2 is a cross-sectional view of the heat response valve 100 in the valve open state.

The heat-responsive valve 100 includes an expansion medium 3, a first diaphragm 41, a second diaphragm 42, a contact portion 5, a valve body 6, and a valve seat 7.

The expansion medium 3 expands and contracts depending on the temperature. For example, the expansion medium 3 is a liquid having a boiling point lower than that of water. The expansion medium 3 may be water or a mixture of water and a liquid having a boiling point lower than that of water.

The first diaphragm 41 is formed in a substantially disk shape. The first diaphragm 41 is formed in a corrugated shape instead of a flat plate. Due to this corrugated shape, the first diaphragm 41 can be deformed so that the central portion thereof is displaced in the direction of the central axis of the first diaphragm 41.

The second diaphragm 42 is formed in a substantially disk shape having substantially the same outer diameter as the first diaphragm 41. The second diaphragm 42 is formed in a corrugated shape instead of a flat plate. Due to this corrugated shape, the second diaphragm 42 can be deformed so that the central portion thereof is displaced in the direction of the central axis of the second diaphragm 42.

The first diaphragm 41 and the second diaphragm 42 are sandwiched between the first plate 81 and the second plate 82 in a state of facing each other. The first plate 81 has substantially the same outer diameter as the first diaphragm 41 and the second diaphragm 42, and is formed in a substantially disk shape whose center bulges upward. The second plate 82 has substantially the same outer diameter as the first diaphragm 41 and the second diaphragm 42, and is formed in a substantially disk shape whose center bulges downward. The first plate 81 and the second plate 82 form a space between the first plate 81 and the second plate 82. The first plate 81, the first diaphragm 41, the second diaphragm 42, and the second plate 82 are arranged in this order. The peripheral edges of the first diaphragm 41, the second diaphragm 42, the first plate 81, and the second plate 82 overlap each other and are fixed by welding.

A storage chamber 83 for accommodating the expansion medium 3 is formed between the first plate 81 and the first diaphragm 41. That is, the first diaphragm 41 partially partitions the accommodation chamber 83. The accommodation chamber 83 is a closed space. The first diaphragm 41 is deformed by the expansion and contraction of the expansion medium 3. Specifically, when the expansion medium 3 expands, the first diaphragm 41 is deformed so that the central portion of the first diaphragm 41 is separated from the first plate 81, that is, the accommodation chamber 83 is expanded. On the other hand, when the expansion medium 3 contracts, the first diaphragm 41 is deformed so that the central portion of the first diaphragm 41 approaches the first plate 81, that is, the accommodation chamber 83 shrinks.

A stopper 84 that limits the deformation of the first diaphragm 41 is provided in the accommodation chamber 83. The stopper 84 is attached to the first plate 81. The stopper 84 limits the deformation of the first diaphragm 41 toward the first plate 81.

At the center of the first plate 81, an opening 85 for injecting the expansion medium 3 into the storage chamber 83 is formed. The opening 85 is sealed by a stopper 86. For example, the stopper 86 is fixed to the opening 85 by welding.

The second diaphragm 42 is arranged outside the accommodation chamber 83 so as to face the first diaphragm 41. The second diaphragm 42 is provided with a contact portion 5 and a valve body 6. The contact portion 5 and the valve body 6 are welded so as to sandwich the central portion of the second diaphragm 42. The contact portion 5 is provided on the surface of the second diaphragm 42 facing the first diaphragm 41. That is, the contact portion 5 is arranged in the space 43 between the first diaphragm 41 and the second diaphragm 42. The contact portion 5 transmits the deformation of the first diaphragm 41 to the second diaphragm 42 by contacting the first diaphragm 41 when the expansion medium 3 is expanded. The valve body 6 is provided on the surface of the second diaphragm 42 opposite to the surface facing the first diaphragm 41. The contact portion 5 and the valve body 6 are integrally displaced with the central portion of the second diaphragm 42 according to the deformation of the second diaphragm 42. By matching or approximating the thickness of the contact portion 5 with the thickness of the space 43, the displacement of the first diaphragm 41 at the time of expansion of the expansion medium 3 can be directly transmitted to the second diaphragm 42.

An opening 87 is formed in the center of the second plate 82. The valve body 6 partially protrudes from the opening 87 to the outside of the second plate 82. Further, the second plate 82 is formed with a plurality of openings 88 so as to surround the openings 87. Fluid can flow into the space between the second plate 82 and the second diaphragm 42 from the outside of the second plate 82 through the openings 87 and 88.

The valve seat 7 is arranged so as to face the valve body 6. A valve hole 71 is formed in the valve seat 7. The valve hole 71 is closed by the valve body 6 when the expansion medium 3 is expanded, and the valve hole 71 is opened when the expansion medium 3 is contracted.

A through hole 61 penetrating the second diaphragm 42 and the valve body 6 is formed in the second diaphragm 42 and the valve body 6. That is, openings are formed in each of the second diaphragm 42 and the valve body 6, and these openings are continuously connected to form a through hole 61. The axial center X of the through hole 61 coincides with the central axes of the first diaphragm 41 and the second diaphragm 42. The space 43 between the first diaphragm 41 and the second diaphragm 42 communicates with the outside of the space 43 by a through hole 61. When the valve body 6 is closed, the through hole 61 communicates the space 43 with the valve hole 71.

FIG. 3 is a plan view of the contact portion 5. The contact portion 5 is arranged so as to surround the open end of the through hole 61 in the second diaphragm 42. Specifically, the contact portion 5 is formed in an annular shape so as to surround the through hole 61. The contact portion 5 is formed in a substantially annular shape, and an opening 51 connected to the through hole 61 is formed in the center thereof.

Further, the contact portion 5 is formed with a communication passage 53 for communicating the space 43 between the first diaphragm 41 and the second diaphragm 42 and the through hole 61 in a state of being in contact with the first diaphragm 41. That is, the communication passage 53 is formed so as to communicate the space on the outer peripheral side of the contact portion 5 with the through hole 61. Specifically, four communication passages 53 are formed on the upper surface 52 of the contact portion 5 which is a surface facing the first diaphragm 41. The communication passage 53 is composed of a groove formed on the upper surface 52 so as to extend from the outer peripheral edge to the inner peripheral edge of the contact portion 5. The communication passage 53 extends in the radial direction about the axis X of the through hole 61.

Subsequently, the operation of the heat response valve 3 configured as described above will be described together with the operation of the drain trap 1. FIG. 4 is a cross-sectional view of the heat response valve 100 in the closed state.

As shown in FIG. 1, a fluid such as a drain or a steam flows into the drain trap 1 from the inflow port 12. The fluid flowing in from the inflow port 12 flows into the first continuous passage 16 and passes through the strainer 16a to remove dust and the like. The fluid that has passed through the strainer 16a flows into the valve chamber 14 through the second communication passage 17.

The fluid flowing into the valve chamber 14 circulates around the heat response valve 100. At this time, the fluid can flow into the space between the second diaphragm 42 and the second plate 82 through the openings 87 and 88 of the second plate 82. Further, when the valve body 6 is opened, the fluid can flow into the space 43 between the first diaphragm 41 and the second diaphragm 42 through the through hole 61. The expansion medium 3 is heated or cooled by the fluid flowing around the heat response valve 100.

When the valve chamber 14 is at a low temperature, such as at the time of starting, the volume of the expansion medium 3 (that is, the degree of expansion) is small, and the central portion of the first diaphragm 41 is the first plate 81, as shown in FIG. The first diaphragm 41 is deformed so as to approach. At this time, the deformation of the first diaphragm 41 is limited by the stopper 84. The valve body 6 is separated from the valve seat 7 and the valve hole 71 is opened. In this case, the fluid flowing into the valve chamber 14 is discharged from the outflow port 13 through the valve hole 71. When the fluid flowing into the drain trap 1 is a relatively low-temperature fluid such as drain or air, the valve body 6 is maintained in an open state, and the fluid is continuously discharged from the outflow port 13.

On the other hand, when the fluid flowing into the drain trap 1 is a relatively high temperature fluid such as steam, the temperature of the valve chamber 14 rises and the expansion medium 3 expands as shown in FIG. Due to the expansion of the expansion medium 3, the first diaphragm 41 is deformed, and the central portion of the first diaphragm 41 is displaced toward the second diaphragm 42. The first diaphragm 41 comes into contact with the contact portion 5 and presses the central portion of the second diaphragm 42 on the side opposite to the first diaphragm 41. As a result, the valve body 6 is displaced downward, that is, toward the valve seat 7. The valve hole 71 is closed when the valve body 6 is seated on the valve seat 7. As a result, the discharge of steam from the outlet 13 is prevented.

When the temperature of the expansion medium 3 drops due to heat dissipation or the like, the expansion medium 3 shrinks. The first diaphragm 41 is deformed so that its central portion is displaced upward, that is, to the side opposite to the second diaphragm 42. As a result, the pressure of the second diaphragm 42 via the contact portion 5 by the first diaphragm 41 is also released. The second diaphragm 42 is deformed so that its central portion is displaced upward. The valve body 6 is separated from the valve seat 7, and the valve hole 71 is opened. When the temperature of the expansion medium 3 drops in this way, the steam in the valve chamber 14 condenses into a drain. That is, the fluid is discharged from the discharge port 13, but the fluid is not steam but drain.

The heat response valve 100 configured in this way has a fail-open function.

Specifically, when the first diaphragm 41 is damaged in the valve closed state (for example, in FIG. 4, when the A portion of the first diaphragm 41 is damaged), the expansion medium 3 is changed from the accommodation chamber 83 to the first diaphragm 41. It leaks into the space 43 between the second diaphragm 42. The expansion medium 3 leaking into the space 43 flows out to the valve hole 71 through the through hole 61 (see the alternate long and short dash line in the figure). The first diaphragm 41 is deformed so that the central portion thereof is displaced to the side opposite to the second diaphragm 42 due to the leakage of the expansion medium 3. The second diaphragm 42 is released from the pressure of the first diaphragm 41 and is deformed so that its central portion is displaced upward. Correspondingly, the valve body 6 is separated from the valve seat 7, and the valve hole 71 is opened. As a result, the high temperature fluid around the heat response valve 100 flows out from the valve hole 71.

On the other hand, when the second diaphragm 42 is damaged in the valve closed state (for example, when the B portion of the second diaphragm 42 is damaged in FIG. 4), the high temperature fluid around the heat response valve 100 is the second diaphragm 42. Enters the space 43 between the first diaphragm 41 and the second diaphragm 42. The high-temperature fluid that has entered the space 43 flows out to the valve hole 71 through the through hole 61 (see the thick broken line in the figure). That is, the high-temperature fluid around the heat-responsive valve 100 flows out of the valve hole 71 through the space 43 and the through hole 61.

When either the first diaphragm 41 or the second diaphragm 42 is damaged in this way, the valve hole 71 is substantially opened, and the flow path 18 in the drain trap 1 is opened. This fail-open function allows the fluid to pass through the drain trap 1 even if the first diaphragm 41 or the second diaphragm 42 is damaged.

Such a fail-open function functions appropriately by the communication passage 53 formed in the contact portion 5.

Specifically, even if either the first diaphragm 41 or the second diaphragm 42 is damaged, the fluid in the space 43 flows into the through hole 61, so that the valve hole 71 is substantially opened. However, in the valve closed state, the first diaphragm 41 is in contact with the upper surface 52 of the contact portion 5. As a result, the opening 51 of the contact portion 5 is covered with the first diaphragm 41. That is, the open end of the through hole 61 in the second diaphragm 42 is also covered with the first diaphragm 41. Since the first diaphragm 41 and the upper surface 52 are not in perfect contact with each other and there is some gap between them, the fluid in the space 43 can flow into the through hole 61 even if there is no communication passage 53. However, the flow rate is small.

On the other hand, by providing the communication passage 53, the fluid in the space 43 flows into the opening 51 through the communication passage 53, and then flows into the through hole 61. Even when the first diaphragm 41 and the upper surface 52 are in contact with each other, the flow rate of the fluid from the space 43 to the through hole 61 can be secured. As a result, when the first diaphragm 41 is damaged, the expansion medium 3 can be appropriately circulated from the space 43 to the through hole 61 (see the alternate long and short dash line in FIG. 4), and when the second diaphragm 42 is damaged, the high temperature fluid can be passed through the space 43. Can be appropriately distributed from the through hole 61 (see the thick broken line in FIG. 4). As a result, the fail-open function can be made to function properly.

As described above, the heat response valve 100 divides the expansion medium 3 that expands according to the temperature and the storage chamber 83 that houses the expansion medium 3 at least partially, and is deformed by the expansion and contraction of the expansion medium 3. The first diaphragm 41, the second diaphragm 42 arranged to face the first diaphragm 41 on the outside of the accommodation chamber 83, and the expansion medium 3 provided on the surface of the second diaphragm 42 facing the first diaphragm 41. The contact portion 5 that transmits the deformation of the first diaphragm 41 to the second diaphragm 42 by the contact of the first diaphragm 41 at the time of expansion, and the surface of the second diaphragm 42 opposite to the surface facing the first diaphragm 41. The valve body 6 provided and the valve hole 71 are formed, and the valve hole 71 is closed by the valve body 6 when the expansion medium 3 is expanded, and the valve seat 7 is opened when the expansion medium 3 is contracted. , The second diaphragm 42 and the valve body 6 penetrate the second diaphragm 42 and the valve body 6, and when the valve body 6 is closed, the space 43 and the valve hole 71 between the first diaphragm 41 and the second diaphragm 42 A through hole 61 is formed to communicate with the first diaphragm 41, the contact portion 5 is arranged so as to surround the open end of the through hole 61 in the second diaphragm 42, and the contact portion 5 has a space in contact with the first diaphragm 41. A communication passage 53 for communicating the 43 and the through hole 61 is formed.

According to this configuration, when the low temperature fluid is present around the heat response valve 100, the expansion medium 3 does not expand so much. The first diaphragm 41 does not deform the second diaphragm 42 via the contact portion 5, and as a result, the valve body 6 opens the valve hole 71. As a result, the low temperature fluid flows out from the valve hole 71. On the other hand, when a high temperature medium is present around the heat response valve 100, the expansion medium 3 expands and the first diaphragm 41 is deformed in the direction in which the accommodation chamber 83 expands. The first diaphragm 41 deforms the second diaphragm 42 via the contact portion 5, and the valve body 6 closes the valve hole 71. As a result, the outflow of the high temperature fluid from the valve hole 71 is prevented. In this way, the heat response valve 100 causes the low temperature fluid to flow out while blocking the high temperature fluid from flowing out.

When at least one of the first diaphragm 41 and the second diaphragm 42 is damaged in the closed state, the fail open function of the heat response valve 100 operates. Specifically, when the first diaphragm 41 is damaged, the expansion medium 3 leaks from the accommodation chamber 83 into the space 43 between the first diaphragm 41 and the second diaphragm 42, and flows out to the valve hole 71 through the through hole 61. .. As the expansion medium 3 of the accommodation chamber 83 decreases, the first diaphragm 41 is deformed in the direction in which the accommodation chamber 83 shrinks. Along with this, the second diaphragm 42 is also deformed, and the valve body 6 opens the valve hole 71. As a result, the high temperature fluid flows out from the valve hole 71.

On the other hand, when the second diaphragm 42 is damaged, the high temperature fluid around the heat response valve 100 enters the space 43 between the first diaphragm 41 and the second diaphragm 42 via the second diaphragm 42. The high-temperature fluid that has entered flows out to the valve hole 71 through the through hole 61. As a result, the high temperature fluid flows out from the valve hole 71.

Here, in the valve closed state, since the contact portion 5 and the first diaphragm 41 are in contact with each other, the open end of the through hole 61 in the second diaphragm 42 is covered with the first diaphragm 41. However, since the communication passage 53 is formed in the contact portion 5, it is possible to secure the flow of the fluid from the space 43 between the first diaphragm 41 and the second diaphragm 42 to the through hole 61. As a result, the above-mentioned fail-open function can be made to function properly.

Specifically, the contact portion 5 is formed in an annular shape so as to surround the through hole 61, and the communication passage 53 is formed so as to communicate the space on the outer peripheral side of the contact portion 5 with the through hole 61.

According to this configuration, the contact portion 5 is formed in an annular shape so that the through hole 61 is arranged on the inner peripheral side. In a state where the first diaphragm 41 is in contact with the contact portion 5, the outer peripheral side of the contact portion 5 is a space 43 between the first diaphragm 41 and the second diaphragm 42. The communication passage 53 communicates the space 43 with the through hole 61. That is, the communication passage 53 is formed so as to communicate the inner peripheral side and the outer peripheral side of the contact portion 5 formed in an annular shape.

Further, the communication passage 53 is formed by a groove formed so as to extend from the outer peripheral edge to the inner peripheral edge of the contact portion 5 on the upper surface 52 (the surface facing the first diaphragm 41) of the contact portion 5.

According to this configuration, the communication passage 53 can be easily formed. Specifically, for example, the communication passage 53 may be formed by a hole having a closed cross section penetrating from the outer peripheral surface to the inner peripheral surface of the contact portion 5 formed in an annular shape. However, when the contact portion 5 is small, it is not easy to form such a hole in the contact portion 5. On the other hand, forming a groove on the upper surface 52 is not so difficult even if the contact portion 5 is small.

<< Other Embodiments >>
As described above, the above-described embodiment has been described as an example of the technology disclosed in the present application. However, the technique in the present disclosure is not limited to this, and can be applied to embodiments in which changes, replacements, additions, omissions, etc. are made as appropriate. It is also possible to combine the components described in the above embodiment to form a new embodiment. In addition, among the components described in the attached drawings and the detailed description, not only the components essential for solving the problem but also the components not essential for solving the problem in order to illustrate the above-mentioned technology. Can also be included. Therefore, the fact that those non-essential components are described in the accompanying drawings and detailed description should not immediately determine that those non-essential components are essential.

For example, the heat response valve 100 is incorporated in the drain trap 1, but is not limited thereto. For example, the heat response valve 100 may be used as a valve device that is simply arranged in the casing and allows the low temperature fluid to pass through and blocks the passage of the high temperature fluid.

The first diaphragm 41 may be composed of a plurality of diaphragms instead of one diaphragm. The second diaphragm 42 may be composed of a plurality of diaphragms instead of one diaphragm. For example, when the heat response valve 100 has a plurality of diaphragms, the plurality of diaphragms sandwiched between the contact portion 5 and the valve body 6 correspond to the second diaphragm, and the storage chamber 83 is at least partially partitioned. A plurality of diaphragms that can come into contact with the contact portion 5 correspond to the first diaphragm.

The contact portion 5 is not limited to an annular shape. For example, the contact portion 5 may be formed in a polygonal ring shape. Alternatively, the contact portion 5 may be a plurality of protrusions arranged so as to surround the through hole 61, that is, arranged around the through hole 61.

The number of passages 53 is not limited to four. The communication passage 53 may be one, two, three, or five or more. Further, the communication passage 53 may be composed of a plurality of grooves formed by knurling the upper surface 52 of the contact portion 5.

Alternatively, the communication passage 53 may be formed as shown in FIG. FIG. 5 is a perspective view of the contact portion 205 according to the modified example. The contact portion 205 is formed with a plurality of notches extending from the upper surface 52 to the surface in contact with the second diaphragm 42. The communication passage 53 is composed of this notch. In this case, the contact portion 5 is formed in an intermittent ring shape instead of a continuous ring shape.

As described above, the techniques disclosed herein are useful for heat-responsive valves.

100 Thermal response valve 3 Expansion medium 41 1st diaphragm 42 2nd diaphragm 43 Space between the 1st diaphragm and the 2nd diaphragm 5,205 Contact part 52 Top surface (face facing the 1st diaphragm)
53 Continuous passage 6 Valve body 61 Through hole 7 Valve seat 71 Valve hole 83 Storage chamber

Claims (3)

An expansion medium that expands in response to temperature,
A first diaphragm that at least partially partitions the containment chamber for accommodating the expansion medium and is deformed by the expansion and contraction of the expansion medium.
A second diaphragm arranged outside the containment chamber so as to face the first diaphragm,
A contact portion provided on the surface of the second diaphragm facing the first diaphragm and transmitting the deformation of the first diaphragm to the second diaphragm by contact with the first diaphragm when the expansion medium is expanded.
A valve body provided on a surface of the second diaphragm opposite to the surface facing the first diaphragm, and
A valve seat is provided, wherein a valve hole is formed, the valve hole is closed by the valve body when the expansion medium expands, and the valve hole is opened when the expansion medium contracts.
The second diaphragm and the valve body penetrate the second diaphragm and the valve body, and when the valve body is closed, the space between the first diaphragm and the second diaphragm and the valve hole are provided. Through holes are formed to communicate
The contact portion is arranged so as to surround the open end of the through hole in the second diaphragm.
A thermal response valve in which a communication passage is formed in the contact portion so as to communicate a space between the first diaphragm and the second diaphragm and the through hole in a state of being in contact with the first diaphragm. In the heat response valve according to claim 1,
The contact portion is formed in an annular shape so as to surround the through hole.
The communication passage is a heat response valve formed so as to communicate the space on the outer peripheral side of the contact portion with the through hole. In the heat response valve according to claim 2,
The communication passage is a thermal response valve formed by a groove formed so as to extend from the outer peripheral edge to the inner peripheral edge of the contact portion on the surface of the contact portion facing the first diaphragm.

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