JPH1137326A - Diaphragm type temperature/pressure relief valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a diaphragm type temperature/pressure relief valve which is instantaneously operated at the temperature rising, with a simple structure with a low cost without using a temperature sensor formed of a wax thermoelement. SOLUTION: A valve mechanism for opening and closing a valve port (a) for communicating a connection port 12 and a discharge port 11, by a pressure- sensitive operation of a diaphragm 2, is mounted in a valve casing which comprises the connection port 12 to a can body, and the discharge port 11 opened to the exterior, and a spring for energizing the valve mechanism to a valve opening side, is stably kept in a condition that the spring force is deflected by a holding member 7 made of metal or a resin which is meltable or deformable when a temperature of the water in the can rises to be more than a specified temperature, for connecting the spring with the valve mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor which is attached to a can body of a water heater, a water heater or the like, and detects a temperature of a temperature sensor when the temperature in the can body becomes higher than a specified temperature. A temperature valve that opens by operation to drain hot water from the can body and introduces water into the can instead of the hot water, and opens when the pressure inside the can becomes higher than the specified pressure And a relief valve that operates to release pressure from the body to the outside, and a temperature and pressure relief valve that is built into one body. The present invention relates to an improvement in a diaphragm operated by a pressure and a diaphragm-type temperature and pressure relief valve configured to urge the diaphragm to oppose the pressure on the secondary side by a spring.

[0002]

2. Description of the Related Art As shown in FIG. 1, a diaphragm type temperature and pressure relief valve of the above-mentioned type is provided on a top surface side of a body 1 forming a valve box, as shown in FIG. And a diaphragm 2 for closing the opening above it, provided with a discharge port 11 connected to one side of the body 1, and mounted on the upper wall 110 on the inner end side thereof at the center of the diaphragm 2. A valve port a facing the lower surface side of the valve body v is opened so as to penetrate in the up-down direction, and around the valve port a, an annular ring which comes into contact with the seat surface of the valve body v so as to be able to come and go. A valve seat b is provided, a valve mechanism V is constituted by the valve body v and the valve seat b, and a mounting hole 112 is opened in a portion of the lower wall 111 of the discharge port 11 facing the valve port a. Here, the upper end side of the body 30 of the temperature sensor 3 made of a wax thermoelement is integrally fitted. The assembling, the projecting end of the operating rod 31 projecting from the upper end of the body 30 so as to be able to freely enter and exit faces the lower surface of the mounting bracket 20 of the valve body v, and the temperature sensor is attached to the bottom of the body 1. The connection port 12 is provided so as to surround the lower half of the body 30 of the temperature sensor 3, and a temperature sensing part 32 provided at the lower end of the body 30 of the temperature sensor 3 through an opening at the lower end thereof.
Are protruded downward, and a flow path 13 communicating the inner end side of the connection port 12 and the above-described pressure-sensitive chamber 10 is provided in the body 1.
Is formed, and an inner end side of a hot water supply port 14 provided on a side surface of the body 1 is communicated with the spring case 4. A spring case 4 surrounding the upper surface side of the diaphragm 2 is attached to the upper surface of the body 1. A spring 40 for biasing the diaphragm 2 downward is inserted into the inside of the valve to constitute a diaphragm type temperature and pressure relief valve A.

[0003] Thus, by connecting the connection port 12 provided on the bottom side of the body 1 to a connection port provided on the upper surface side of a can body such as a water heater or a water heater, the connection port 12 is assembled. Temperature sensing part 32 of temperature sensor 3 projecting downward from connection port 12
Operates by detecting the temperature of the water in the can body, and when the temperature of the water becomes higher than the specified temperature, the operating rod 31 of the temperature sensor 3 is pushed out to push up the valve body v,
Hot water is discharged from the discharge port 11 by opening the valve port a which is a relief port, and at the same time, water is introduced from the water pipe into the can body in place of the discharged hot water.

When the pressure inside the can increases, when the pressure rises above a set pressure set by the spring pressure of the spring 40 and the pressure receiving area of the diaphragm 2, the diaphragm 2 moves upward. Then, when the seat surface of the valve body v is pulled upward from the valve seat b, the valve port a serving as a relief port is opened, and the pressure in the can is discharged from the discharge port 11 to the outside.

In addition to this means, there is a means shown in FIG. 2 developed by the present applicant. This means is the same as that shown in FIG.
The following means are added to the means described in (1). That is, the body 30 of the temperature sensor 3 is vertically movably assembled to the mounting hole 112 provided in the body 1, and the operating rod 31 projecting from the upper end thereof faces the lower surface of the valve body v, and A cylinder 50 is slidably arranged in the vertical direction on the outer periphery of the body 30.
Is inserted into the cylinder 50, and the upward escape thereof is regulated by a stopper 51 made of a ring and biased so as to be pushed upward by a spring 52. A stopper for supporting a valve seat b opposed to the seat surface of the cylinder 50 so that the valve seat b can freely move up and down, and a rising operation by a spring 52 connected to the cylinder 50 at a predetermined position. And a valve support seat c for regulating the lowering operation of the valve body v at a predetermined position around the valve port a.
When the pressure rises, the diaphragm 2 raises, so that the seat surface on the lower surface of the valve body v moves upward from the annular valve seat b at the end of the operation on the rising side by the stopper 54. Thus, when the temperature of the water in the can body rises above a specified value, the body 30 of the temperature sensor 3 in which the valve seat b is pushed up to the position where the valve seat b abuts on the valve body v when the temperature of the can water in the can body rises above a specified value. From the upper end of the operating rod 3
1 is pushed out, the upper end thereof abuts against the lower surface of the valve body v, so that the body 30 of the temperature sensor 3 moves downward by an amount corresponding to the pushing out of the operating rod 31,
In this configuration, the valve seat b is pulled down to open the valve.

[0006]

According to the prior art described above, the temperature sensor 3 composed of a wax thermoelement detects a temperature rise exceeding a specified value and opens the valve mechanism V. When this is done, a large force is required to move the valve element v against a large set spring load set by the spring pressure of the spring 40 that pushes down the diaphragm 2, making the temperature sensor 3 difficult to manufacture and expensive. Therefore, there is a problem that the manufacturing cost of the diaphragm type temperature and pressure relief valve is increased, and the valve opening operation is performed when the temperature rises more than a specified value, resulting in a slow response. In addition, since the set spring load is large, there is a problem that a deformation / damage is caused in a contact portion of the valve surface v of the valve body v formed in a disc shape with the elastic material and the valve seat b, thereby shortening the service life. .

[0007] In the means shown in FIG.
Can increase the service life by reducing the deformation and damage of the seat surface, but the temperature sensor 3 composed of a wax thermoelement becomes expensive, which increases the manufacturing cost of the diaphragm type temperature and pressure relief valve, There is a problem that the valve opening operation is slow.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem occurring in the conventional means, and does not use a temperature sensor composed of a wax thermoelement.
With a simple mechanism, it is possible to provide a new means capable of providing a diaphragm-type temperature and pressure relief valve which is inexpensive and which operates instantaneously at the time of temperature rise, and a new means capable of extending the service life. Aim.

[0009]

According to the present invention, as a means for achieving the above object, a connection port is provided in a valve box having a connection port for a can body and a discharge port opened to the outside. A valve mechanism that opens and closes by pressure-sensitive operation of the diaphragm is installed at the valve port that communicates with the discharge port. A diaphragm-type temperature and pressure relief valve characterized in that a spring member is held in a deflected state by a holding member formed of metal or resin that is melted or deformed by increasing the temperature, and is connected to a valve mechanism. It is to raise.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A diaphragm type temperature / pressure relief valve according to the present invention is basically a valve port for connecting a connection port and a discharge port in a valve box provided with a connection port and a discharge port for a can body. And a valve mechanism comprising a valve body for opening and closing the valve port and a valve seat, and a pressure-sensitive chamber which communicates with the connection port and is pressure-sensitively operated by the diaphragm when the valve mechanism is closed. The valve body or valve seat of the valve mechanism is assembled to the diaphragm thereof and urged toward the valve closing side by a spring connected to the diaphragm, whereby the pressure in the can body communicating through the connection port becomes a specified pressure. When the diaphragm rises, the diaphragm mechanism operates to open the valve mechanism so that pressure is released from the discharge port.A rod is connected to the valve body or valve seat of the valve mechanism, and a spring is attached to the rod. Feeling the temperature of the water inside the can The valve is controlled so that the valve mechanism moves to the valve opening side by the operation of detecting that the temperature has exceeded the specified temperature by the temperature sensing part protruding from the connection port. When the temperature rises above the temperature, the valve is opened and the hot water in the can is discharged from the outlet, and water is introduced into the can instead of this hot water. In order to move the rod to the valve opening side of the valve mechanism, a spring attached to the rod is held in a state in which the spring force is bent by a metal or synthetic resin material that melts or deforms due to a rise in temperature. When the temperature of the water rises above the specified temperature, the metal or synthetic resin material melts or deforms, releasing the spring force that has been bent and controlling the valve mechanism to open immediately. I do.

In the means of the present invention, the metal or synthetic resin material for holding the spring for urging the rod in the direction to open the valve mechanism in a normal state in a state where the spring force thereof is bent is as follows: An alloy that melts like a fuse by rising to a predetermined temperature, or a shape memory alloy or a shape memory resin whose shape changes when the temperature rises is used.

Further, as shown in FIG. 1 and FIG. 2, the present invention has a form in which a connection port for hot water supply is provided in the valve box in the middle of a flow path connecting the connection port and the pressure-sensitive chamber. Not limited to this, the valve box does not have this connection port for hot water supply, only the connection port to the can body and the discharge port are provided, and it may be configured to function only as a temperature and pressure relief valve. is there.

[0013]

Next, an embodiment will be described in detail with reference to the drawings. In the drawings, the same reference numerals are used for components having the same effects as those of the conventional means.

FIG. 3 shows a first embodiment of a diaphragm type temperature and pressure relief valve A of a hot water supply facility according to the present invention. In the figure, 1 is a body forming a valve box, and 12 is a body 1 of the body.
A connection port provided at the bottom of the body so as to be connected to the can body, 11 is a discharge port provided on the side surface of the body 1, a is a valve port provided in the body 1 so as to connect the connection port 12 and the discharge port 11. , V
Is a valve mechanism for opening and closing the valve port a, b is a valve seat of a valve mechanism V formed in an annular shape around the valve port a, and v is disposed above the valve port a so as to open and close the valve port a. Of the valve mechanism V,
Reference numeral 10 denotes a pressure-sensitive chamber formed in an upper portion of the body 1 so as to communicate with the connection port 12 via the flow path 13 when the valve body v closes the valve port a. A diaphragm 20 is mounted on the upper surface side of the body 1 so as to divide the side, 20 is a mounting bracket for mounting the above-mentioned valve body v on the diaphragm 2, and 4 is mounted on the upper surface side of the body 1 so as to surround the upper surface of the diaphragm 2. The attached spring case 40 is disposed within the spring case 4 and the spring 41 for urging the diaphragm 2 downward is an adjusting screw for adjusting the spring pressure of the spring 40. When the pressure in the can body connected through the diaphragm reaches a specified pressure, the diaphragm 2
Is pushed up against the spring pressure of the spring 40 to separate the seat surface of the valve body v from the valve seat b to open the valve port a, thereby forming a relief valve mechanism for releasing the pressure from the discharge port 11 to the outside. I have.

Reference numeral 6 denotes a rod for opening the valve mechanism V when the water in the can body rises above a specified temperature.
The lower wall 111 of the discharge port 11 in the body 1 is fitted so as to freely slide up and down while maintaining watertightness, and the upper end thereof faces the center of the lower surface of the valve body v. Is projected downward from the connection port 12.

The rod 6 is connected to a locking member 60 for supporting a spring provided at an intermediate portion in the axial direction of the rod 6 and a connection port 12.
The lower end of the rod 6 penetrating through the spring supporting member 61 is urged by a spring 62 bridged between the spring supporting member 61 attached to the opening portion of the rod 6 and the spring 62. By pulling the spring 62 downward against the urging force of the rod 62, the spring force (spring pressure) of the spring 62 is bent, and in this state, the spring 62 is connected to the support member 63 provided at the lower end of the rod 6. A holding member 7 formed in a cylindrical shape from a fuse-like alloy that melts at a desired temperature, such as 98 ° C., is interposed between the support member 61 for supporting a spring provided at the opening 12, The lifting operation of the rod 6 by the spring 62 is kept stopped.

Accordingly, when the temperature of the water in the can becomes 98.degree. C., for example, when the temperature of the water in the can is set to 98.degree. Is melted and dropped, the spring force of the spring 62 bent by the retaining member 7 is released, and the support member 63 for supporting the retaining member 7 at the lower end abuts against the lower surface of the support fitting 61. As shown in FIG. 4, the valve mechanism V is opened instantaneously, and hot water in the can is discharged from the discharge port 11, and instead of this hot water, water is introduced from the water pipe into the can. Become so.

In this embodiment, when the safety operation is performed in response to the rise of the water in the can body, the retaining member 7 melts like a fuse and cannot be reset. The retaining member 7 made of an alloy is assembled and used again.

Next, FIGS. 5 and 6 show another embodiment. The diaphragm-type temperature and pressure relief valve A in this embodiment is different from the above-described embodiment in that the discharge port 11 is provided on the side surface of the body 1 below the diaphragm 2 attached to the body 1. This is an example in which the outlet 11 is provided in a spring case 4 attached to the upper surface side of the diaphragm 2.
Is formed in a cylindrical shape and protrudes toward the upper surface of the diaphragm 2.
Has been established.

In the body 1, a partition 15 for separating the valve port a from the connection port 12 and a flow path 13 communicating the pressure-sensitive chamber 10 is located below the valve body v so as to be a shelf plate. Provided in
A valve seat b facing the seat surface of the valve body v is provided in an annular shape, and a rod 6 for operating the valve body V to be pushed up is moved up and down freely by keeping the partition wall 15 watertight. It is inserted so that it does.

The rod 6 is urged by a spring 62 to the side to be raised, and the lower end side of the rod 6 is projected downward from a support fitting 61 provided at the connection port 12 to melt the alloy at a predetermined temperature. The lower end of the retaining member 7 is supported by a support member 63 provided at the lower end of the rod 6, whereby the spring force of the spring 62 is bent by the retaining member 7. This is the same as the above-described embodiment, but the spring 62 is stretched between the upper surface of the partition wall 15 and the locking member 60 for supporting the spring provided at the upper end of the rod 6. I have. Other configurations are the same as those of the above-described embodiment, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

In this embodiment, when the temperature of the can water in the can body rises to a predetermined temperature and the alloy forming the retaining member 7 melts and falls off, the spring force that has been bent is used as shown in FIG.
, The valve body V is instantly pushed up and the valve is opened.

FIG. 7 shows a modification of the embodiment shown in FIGS. 5 and 6. This embodiment is an example in which the retaining member 7 in the above-described example is formed by using a shape memory alloy that is deformed at a predetermined temperature, thereby holding the spring 62 in a flexed state. The remaining configuration except for is the same as the above-described example.

That is, the rod 6 which is slidably fitted into the partition 15 and whose upper end faces the lower surface of the valve body v, is located between the locking member 60 provided at the upper end thereof and the upper surface of the partition 15. Spring 62
Is urged upward, the lower end thereof is projected downward from the support fitting 61, and the lower end thereof is pulled downward against the urging force of the spring 62, and is retained by the retaining member 7. When the holding member 7 is held in a state, the holding member 7 is formed into a retaining ring shape by a shape memory alloy at a specified temperature or less,
When the temperature is equal to or higher than the specified temperature, the rod is formed so as to have a widened shape, and is fitted into an annular recess 6a formed on the peripheral surface at the lower end side of the rod 6 as shown in FIG. Retaining ring-shaped retaining member 7 made of the shape memory alloy
Is brought into contact with the lower surface of the support bracket 61 to keep the rod 6 pulled out against the bias of the spring 62, and when the water in the can reaches a specified temperature or more,
The retaining member 7 returns to the expanded shape as shown in FIG.
This is an example in which the rod 6 is instantaneously lifted by the spring 62 to drop the valve body v up and open.

The same components as those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

Next, FIGS. 10 and 11 show still another embodiment. In this embodiment, when the temperature of the water in the can body rises above the specified temperature, the rod 6 is instantaneously valved by the spring force of the spring 62 which is bent due to the melting or deformation of the retaining member 7. This is an example in which the valve mechanism V in a closed state at a temperature equal to or lower than a specified temperature can be opened and closed by a manual operation while the mechanism V is opened.

That is, in this example, the upper surface of the diaphragm 2 attached to the body 1 so as to partition the upper surface of the pressure-sensitive chamber 10 formed in the body 1 is placed on the upper surface of the diaphragm 2.
The lower end side of a shaft 81 that moves up and down by a lever 80 provided at the top of a spring case 4 that stores a spring 40 that urges the diaphragm 2 downward, and by operating this lever 80, the diaphragm 2 is lifted up. A valve body v mounted on the lower surface side of the center portion is provided with a valve seat b provided annularly around a valve port a.
The valve is forcibly opened away from the upper side.

Further, in order to prevent the seat surface of the valve body v from being deformed or damaged by being pressed against the valve seat b around the valve port a, the valve seat b is provided with the valve port a. The valve seat spring 83 is connected to a valve seat support fitting 82 connected to the valve seat b to urge the valve to the ascending side, and the ascending side is actuated. Is regulated by a stopper 84 provided at the lower end side of the valve seat b. Further, the lowering operation of the valve body v is fixed around the valve port a at a portion located on the outer periphery of the valve seat b. Are arranged to form a communication passage through which the hot water flows, whereby the lowering operation of the valve element v by the spring 40 is performed. The valve seat b is lowered while being depressed and stopped at a position where it abuts against the valve support seat c. The upper end face is pressed against the seat surface of the valve body v in spring pressure of the valve seat spring 83 to push the valve seat b of. By setting the valve seat spring 83 to have a much lower spring pressure than the spring 40 that pushes down the diaphragm 2 as the main spring, the seat surface of the valve body v is protected.

When the pressure rises, the seat surface on the lower surface of the valve body v is moved upward by the stopper 8 due to the rise of the diaphragm 2.
4, the valve is opened by moving upward from the annular valve seat b at the end of the operation on the ascending side.

When the temperature of the can water in the can body rises above a specified temperature, the rod 6 that pushes up the valve body v by the spring 62 to open the valve is connected to the discharge port 11 separating the flow path 13 and the discharge port 11. The lower wall 111 is slidably fitted into the lower wall 111 while maintaining watertightness.
Is provided, and a retaining ring-shaped locking member 85 is provided at the upper end thereof to be engaged with the upper surface of the valve seat support fitting 82, so that the locking member 85 is suspended by the locking. There is.

A spring 62 for operating the rod 6 is provided at the lower end of the rod 6 with a locking member 60 for locking the spring.
And a support bracket 61 for supporting the spring provided at the connection port 12 is provided so as to extend over the same, and the rod 6 is pulled out downward, whereby the valve seat b is moved downward and the valve mechanism V
And a retaining member 7 for holding the spring 62 in a state of being compressed and deflected,
It is formed in a ring shape to be fitted to the rod 6 by an alloy that melts when the temperature reaches a predetermined temperature, and is inserted between the spring 62 and the support bracket 61, and is lowered while compressing and compressing the spring 62. The spring 62 is held in a bent state by being held by a sleeve 65 fixed to the peripheral surface of the rod 6.

When the retaining member 7 is melted and falls off, the spring 62 acts to compress the valve seat spring 83 and pull down the valve seat b as shown in FIG. The seat surface of the valve body v, whose abutment is regulated by abutment, is opened to open the valve.

FIG. 12 shows a modification of the embodiment shown in FIGS. In this embodiment, the method of applying a spring 62 that pulls down the rod 6 by the spring force that has been bent when the temperature of the can water in the can body rises above the specified temperature and the retaining member 7 is melted by the heat is set. This is a modified example,
Except for this point, the remaining configuration is the same as the above-described embodiment, and the same components are denoted by the same reference numerals and detailed description thereof will be omitted.

In this example, however, the connection port 12
A spring receiving seat 64 for supporting a spring is arranged in the body 1 above the support fitting 61 provided on the body 1 and fixed to the body 1,
A spring 62 is provided between the spring receiving seat 64 and a locking member 60 for supporting a spring provided at the lower end of the rod 6, so that the spring 62 pulls the rod 6 downward, and the valve seat b
Is lowered downward to open the space between the seat surface of the valve body v, whose lowering is restricted by abutting against the valve support seat c, and the upper end surface of the valve seat b, so that the valve is opened.

However, the retaining member 7 for holding the spring 62 in a state where the spring force is deflected by pressing and contracting the spring 62 is a spring support fitting which is attached to the connection port 12 when the spring 62 is pressed and contracted. 61, so that
In a normal state, the spring 62 does not act on the rod 6 and the rod 6 is lowered by its own weight, and a retaining ring-shaped locking member 85 provided at the upper end of the rod 6 is provided on the upper surface of the valve seat support bracket 82. When the retaining member 7 is suspended by being locked, the can water in the can rises above the specified temperature and the retaining member 7 melts and falls off, as shown in FIG. The lower end side passes through the support fitting 61 and abuts against a locking member 60 provided at the lower end of the rod 6 and is supported. The rod 6 is pulled down by the spring force of the spring 62 to lower the valve seat b. The valve mechanism V is set in an open state.

Next, FIGS. 14 and 15 show still another embodiment. In this embodiment, the shaft 81 for forcibly opening the valve mechanism V in the above-described embodiment by manual operation is held in a pressure adjusting screw 41 provided at the top of the spring case 4 in a watertight manner to be slidable up and down. , And is urged upward by a spring 86, whereby a push button-shaped operating portion 87 is provided on the head of a shaft 81 protruding toward the upper surface side of the spring case 4. As a result, the shaft 81 descends to push down the valve seat b, and abuts against the valve support seat c to open the lower part of the lower surface of the lower surface of the valve body v, which is regulated to descend, so that the valve is opened. In this example, the outlet 1
1 is provided on a spring case 4 assembled on the upper surface side of the body 1, and when the valve is opened, the hot water or pressure in the can is changed to the diaphragm 2.
This is an example in which the gas flows to the upper surface side of the sheet and flows out from the discharge port 11 to the outside.

In this example, since the discharge port 11 is provided in the spring case 4, the annular port slidably fitted to the valve port a formed in the partition 15 below the valve element v in the body 1. Is provided with a bottom plate 90 at the lower end thereof to form a bottomed cylinder, and the upper end surface of the valve seat b abuts against a seat surface on the lower surface of the valve body v, thereby forming the valve seat b. The valve port a is closed by the inner cavity of the valve.

The upper end of the rod 6 for moving the valve seat b downward is integrally connected to the bottom plate 90 of the valve seat b, and is fixedly mounted on the lower surface of the bottom plate 90 and the lower end of the connection port 12. Between the spring support fitting 61 to be provided and the valve seat spring 83 which is set at a spring pressure far weaker than that of the spring 40 and is held up together with the valve seat b,
When the temperature of the water in the can body abnormally rises from this state, the spring 62 for lowering the rod 6 to pull down the valve seat b and open the valve is stronger than the spring pressure of the valve seat spring 83. Locking member 6 set and provided at the lower end of rod 6
0 and the spring supporting member 61, and the retaining member 7 for compressing and compressing the spring 62 to maintain the spring pressure in a deflected state has a temperature rising above a specified temperature. It is formed in the shape of a spring seat by an alloy that is melted by warming, is fitted and inserted into the lower end side of the rod 6, lowers it, and in a state where the above-mentioned spring 62 is compressed and contracted, it is fitted to the rod 6 in advance. By holding the guide sleeve 88 at the lower end thereof, the spring force of the spring 62 is maintained in a deflected state.

As a result, when the water in the can body abnormally rises in temperature, the retaining member 7 is melted and dropped off, so that the spring 62 is connected to the locking member 60 and the spring supporting member as shown in FIG. The rod 6 is pulled down between the bracket 61 and the valve mechanism V so that the valve mechanism V is opened.

Next, FIGS. 16 and 17 show still another embodiment. This example is a modification of the above-described embodiment in which the shaft 81 is pushed in by the operation of the above-mentioned push-button type operation unit 87 and the valve is forcibly opened. This is an example in which the mechanism V is opened.

That is, in this example, the annular valve seat b is attached to the lower surface side of the diaphragm 2 assembled to the body 1, and the valve body v opposed thereto is connected to the connection port 1 at the lower end side in the body 1.
2 is integrally mounted on the upper and lower intermediate portions of a rod 6 which is disposed so as to protrude downward from the upper side and is vertically movable, and protrudes upward through an opening formed in the center of the diaphragm 2. A valve spring 89 set at a much lower spring pressure than the main spring 40 for urging the diaphragm 2 downward is provided between the locking member 85 provided at the upper end of the diaphragm 6 and the upper surface of the diaphragm 2. Then, the rod 6 is urged upward, the seat surface of the valve body v is brought into contact with the valve seat b by the spring pressure of the valve spring 89, and the valve port a formed inside the valve seat b is opened. Make sure it is closed.

Then, the upper end of the rod 6 protruding above the diaphragm 2 is arranged on the top of the spring case 4 below a shaft 81 which is vertically movable in the form of a push button.
By moving the rod 6 downward by the operation of pushing the shaft 81 by the operation of the operation section 87, the valve body v is moved downward to open the valve port a to open the valve.

When the pressure rises, the diaphragm 2 and the valve body v pushed upward by the valve spring 89 are connected to the lower end of the shaft 81 by the upper end of the rod 6 integrally assembled with the valve body v. After that, the valve body v cannot be raised by the shaft 81, and only the diaphragm 2 rises, and the valve seat b and the valve body attached to the diaphragm 2 are raised. v is separated from the seat surface
Is released to release the pressure to the discharge port 11.

The means for pulling down the rod 6 and opening the valve when the water in the can rises above the specified temperature is as follows:
In the embodiment shown in FIG. 10 and FIG. 11 described above, the bridge member is provided between the locking member 60 provided at the lower end of the rod 6 and the spring support member 61 fixedly attached to the connection port 12 at the bottom of the body 1. It is formed of a spring 62 having a spring pressure stronger than that of the valve spring 89 and an alloy which is melted when the water in the can becomes higher than a specified temperature, and the spring 62 is kept in a compressed state. By means of a retaining member 7 to be retained, and a guide sleeve 88 which is inserted into the rod 6 so as to retain the retaining member 7 at the position where the spring 62 is compressed and contracted,
A portion of the rod 6 protruding downward from the connection port 12 is provided with a compressed spring 62. As shown in the embodiment shown in FIGS. 13 and 14, this means locks the retaining member 7 on the spring support 61 provided on the connection port 12 and arranges the retaining member 7 on the spring support 61 so that the retaining member 7 is positioned inside the body 1. A spring 62 is provided between the spring receiving seat 64 fixedly mounted on the rod 6, and when the retaining member 7 is melted and dropped, the lower end of the spring 62 that extends is provided at the lower end of the rod 6. In some cases, the rod 6 may be lowered by abutting against the locking member 60.

[0045]

As described above, the diaphragm type temperature and pressure relief valve according to the present invention is a valve mechanism that opens and closes the valve port a communicating with the discharge port 11 by the pressure-sensitive operation of the diaphragm 2.
Is opened when the can water in the can body connected by the connection port 12 has risen to a specified temperature or higher, the spring 62 for opening the valve mechanism V is heated to a specified temperature or higher. By holding the spring force in a deflected state by a retaining member 7 formed of a metal or resin that melts or deforms, the retaining member 7 is melted or deformed to release the retaining force. Since the valve is instantly opened by the spring force of 62, the valve is opened instantly when the temperature rises, using a very simple mechanism without using a temperature sensor consisting of a wax thermoelement. Diaphragm type temperature and pressure relief valve can be manufactured at low cost.

[Brief description of the drawings]

FIG. 1 is a vertical sectional front view of a conventional diaphragm type temperature and pressure relief valve.

FIG. 2 is a vertical sectional front view of another conventional diaphragm type temperature and pressure relief valve.

FIG. 3 is a vertical sectional front view of a diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 4 is a longitudinal sectional front view showing a state in which the diaphragm type temperature and pressure relief valve is opened by the temperature rise of the same.

FIG. 5 is a longitudinal sectional front view of another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 6 is a vertical sectional front view showing a state where the valve is opened to increase the temperature in the embodiment.

FIG. 7 is a longitudinal sectional front view of still another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 8 is an enlarged vertical sectional front view of a portion of the embodiment.

FIG. 9 is an enlarged vertical sectional front view of the embodiment, in which the retaining member is deformed due to a rise in temperature of the portion.

FIG. 10 is a longitudinal sectional front view of still another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 11 is a longitudinal sectional front view showing a state in which the retaining member is melted and dropped by the temperature rise in the embodiment.

FIG. 12 is a longitudinal side view of still another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 13 is a longitudinal sectional front view showing a state in which the retaining member is melted and dropped by the temperature rise in the embodiment.

FIG. 14 is a longitudinal sectional front view of still another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 15 is a longitudinal sectional front view showing a state in which the retaining member of the embodiment is melted and dropped by a rise in temperature.

FIG. 16 is a longitudinal sectional front view of still another embodiment of the diaphragm type temperature and pressure relief valve according to the present invention.

FIG. 17 is a longitudinal sectional front view showing a state in which the retaining member of the embodiment is melted and dropped by a rise in temperature.

[Explanation of symbols]

A: Diaphragm-type temperature / pressure relief valve, V: Valve mechanism, v ...
Valve body, a ... Valve, b ... Valve seat, c ... Valve support seat, 1 ... Body, 10 ... Pressure sensitive chamber, 11 ... Exhaust port, 110 ... Top wall, 11
DESCRIPTION OF SYMBOLS 1 ... Lower wall, 112 ... Mounting hole, 12 ... Connection port, 13 ... Flow path, 14 ... Hot water supply port, 15 ... Partition wall, 2 ... Diaphragm, 2
0 ... Mounting bracket, 21 ... Communication port, 3 ... Temperature sensor, 30 ...
Body part, 31 ... Working rod, 32 ... Temperature sensing part, 4 ... Spring case, 40 ... Spring, 41 ... Pressure adjusting screw, 50 ... Tube, 51
... stopper, 52 ... spring, 53 ... support leg, 54 ... stopper, 6 ... rod, 6a ... annular depression, 60 ... locking member, 61 ... spring support bracket, 62 ... spring, 63 ... support member, 64 ... spring support Seat, 65 ... sleeve, 7 ... retaining member,
80 ... lever, 81 ... shaft, 82 ... valve seat support bracket, 83 ...
Valve seat spring, 84 ... stopper, 85 ... locking member, 86 ...
Spring, 87: operation unit, 88: guide sleeve, 89: valve spring, 90: bottom plate.

Claims (5)

[Claims] 1. A valve mechanism for opening and closing a valve port communicating between a connection port and a discharge port in a valve box having a connection port for a can body and a discharge port opened to the outside by a pressure-sensitive operation of a diaphragm. And a spring that urges the valve mechanism to the valve-opening side.
A retaining member made of metal or resin that melts or deforms when the can water in the can rises to a specified temperature or higher, and that the spring force is maintained in a deflected state and linked to the valve mechanism. Features a diaphragm type temperature and pressure relief valve. 2. A valve body of a valve mechanism is attached to a diaphragm,
A valve seat facing the valve body is provided on the valve box, and a rod is provided in the valve box such that the upper end faces the lower surface of the valve body and the lower end projects from the connection port in a vertically movable manner. A retaining member that connects a spring biasing in a direction to push up the rod, and a retaining member that retains the rod at a lower position by bending the spring force of the spring and lowering the rod, at a lower end side of the rod, when the water in the can body exceeds a specified temperature. 2. The diaphragm type temperature and pressure relief valve according to claim 1, wherein the diaphragm type temperature and pressure relief valve is formed of a metal or a resin that melts when the temperature is raised. 3. A valve body of a valve mechanism is attached to the diaphragm,
A valve seat facing the valve body is provided on the valve box, and a rod is provided in the valve box such that the upper end faces the lower surface of the valve body and the lower end projects from the connection port in a vertically movable manner. A retaining member is connected to a lower end of the rod to urge the spring force of the spring to retain the rod at a lowered position. The diaphragm-type temperature / pressure relief valve according to claim 1, wherein the diaphragm-type temperature / pressure relief valve is formed and interposed with a shape memory alloy or a shape memory resin that is deformed by increasing the temperature. 4. A valve body of a valve mechanism is assembled to the diaphragm,
A valve seat opposed to the valve body is provided vertically movable, and a valve seat spring that urges the valve seat to be pushed up toward the valve body is connected to the valve seat, and the upper end side of the rod is connected to the valve seat, and the rod is connected to the valve seat. A spring that urges the spring to be pulled downward is connected via a retaining member that retains the spring force of the spring in a deflected state, and the retaining member is raised by increasing the temperature of the water in the can body to a specified temperature or higher. The diaphragm type temperature and pressure relief valve according to claim 1, wherein the diaphragm type temperature and pressure relief valve is formed of a metal or a resin that melts or deforms. 5. A valve seat of a valve mechanism is assembled to the diaphragm,
A valve spring, which is mounted on a rod provided to be vertically movable in the valve box, urges the valve body opposed to the valve seat toward a valve seat, and urges the rod to pull the spring downward. It is connected via a retaining member that retains the spring force of the spring in a deflected state, and the retaining member is formed of a metal or resin that melts or deforms when the water in the can rises above a specified temperature. The diaphragm type temperature and pressure relief valve according to claim 1, wherein: