JPH11304039A - Lever device of relief valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To automatically return a lever to its original point from a valve closing state on confirming valve element working by a lever device of a relief valve. SOLUTION: This device is constituted free to oscillate a lever 41 forward and backward with first and second support shafts and to hold or return a pressing-down state of a control rod at the time of releasing operating force to the lever 41 by providing a bottom plate part of the L-shaped rod 41 on the control rod, providing the first support shaft on the bottom plate part, providing the second support shaft on a front plate part erected on the bottom plate part immediately beside and in parallel with the first support shaft, setting a distance between the first support shaft and the front plate part longer than a distance between the bottom plate part and the first support shaft and in length with which the front plate part pushes the control rod down to a valve opening position, providing a circular arc track of the second support shaft along a trailing position of the first support shaft on a main body head part through a projected end of the control rod from a position of the lever 41 with the second support shaft as a fulcrum and providing a circular arc track of the first support shaft along a range where the bottom plate part pressurizes the control rods from a position of the lever 41 with the first support shaft as a fulcrum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lever device for a relief valve for a hot water device provided on a hot water side or a water supply side of a hot water heat exchanger.

[0002]

2. Description of the Related Art Conventionally, as shown in FIGS. 14 and 15, this type of relief valve a is provided with an adjustment rod d disposed above a valve rod c in order to adjust the lift of a valve body b. The valve body b is forcibly opened via the valve rod c by pressing the adjustment rod d with the operating rod g of the lever device f provided on the top part e. Structure is adopted. And the top e
In the mounting structure of the lever device f in the above, between the flange portion h provided below the top portion e and the support nut i of the adjusting rod d,
The ring-shaped base k of the support j of the lever device f is rotatably interposed with respect to the top e, and is provided on the left and right sides of a pair of upright walls l and l1 and a pair of standing walls l and l1 projecting upward in the diameter direction of the ring-shaped base k. The operating rod g is rotatably provided by passing the end of a substantially C-shaped wire spring n into the side walls m and m1. Then, the lever device f rotates and inverts the operating rod g, thereby pushing down the adjusting rod d by the front end of the operating rod g to forcibly open the valve body b, and the operating rod g maintains the inverted state. This keeps the valve open.

[0003]

However, in general, the relief valve a for hot water equipment is used to determine whether or not the relief valve a is normally operated by the lever device f, that is, the valve body b is connected to the primary side of the relief valve a. 2
It is necessary to periodically check whether or not to open the valve so as to communicate with the next side. When checking the operation of the lever device f having the above structure, the operating lever g is inverted as described above. If the operator forgets to return the operating lever g to the normal posture after the operation, the valve g is left in the open state and does not function as the relief valve a.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention presses and releases a control rod which is connected to a valve body via a valve rod and which is provided at the top of the main body by a spring so as to be freely retractable. In the lever device of the relief valve provided with the operating rod for opening and closing the valve element, the operating rod is formed to have a substantially L-shaped cross section,
A bottom plate portion of the operating rod is disposed above the adjusting rod so as to swing back and forth, a first support shaft is provided above the bottom plate portion, and a second support shaft is provided on a front plate portion standing upright on the bottom plate portion. The distance provided between the first support shaft and the front plate portion is made longer than the distance between the bottom plate portion and the first support shaft, and the front plate portion pushes down the adjustment rod to the valve opening position. And the circular path of the second support shaft with the first support shaft as the rotation center is moved from the position where the operating rod is the fulcrum of the second support shaft through the projecting end of the adjusting rod to the first support shaft on the top of the main body. It is provided over the hanging position, and the arc trajectory of the first support shaft with the second support shaft as the center of rotation extends from a position where the operating rod is the fulcrum of the first support shaft so that the bottom plate can press the adjustment rod. By providing the operating lever, the operating rod can be swung forward or backward to release the operating force on the operating rod, so that the adjustment rod can be held down or the operating rod can be moved normally. By switching the operation of the operating lever forward or backward in such a way as to return to the force, the operation of forcibly opening the valve body and the operation of confirming the operation of the valve body as in the conventional case are distinguished. At the time of operation confirmation, if the operating rod is released, the adjusting rod is automatically returned by the spring urging upward so that the valve is not left open.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a main body of a relief valve for hot water equipment in which a flow path of an inlet 2 and an outlet 3 is formed at right angles. The main body 1 is provided on a valve box 4 provided with the inlet 2 and a flow path of a primary (inlet 2) side. Diaphragm 7 dividing into flow path 5 and secondary (outlet 3) side flow path 6
The spring box 8 provided with the outlet 3 is joined through the opening, and a cylindrical adjustment chamber 9 defined by the secondary flow path 6 is formed upright on the spring box 8.

The diaphragm 7 has an opening 10 formed in the center, a cylindrical valve port guide 11 is inserted into the opening 10, and a hollow portion of the valve port guide 11 is formed as a valve port 12. The primary opening end of the valve port guide 11 forms a valve seat 13. Further, the valve port guide 11 is provided with a disk-shaped diaphragm retainer 14 joined to the primary side surface (lower surface) of the diaphragm 7 with a step difference provided from the valve seat 13.

A disk-shaped diaphragm holder 15 is also joined to the secondary side surface (upper surface) of the diaphragm 7 in correspondence with the diaphragm holder 14, and the diaphragm holder 15 is provided with an opening of the diaphragm 7. An opening 16 corresponding to 10 is provided at the center. Also, diaphragm holding
An annular concave portion 17 is formed around the opening 16 on the non-joining surface (upper surface) of 15. Then, the secondary opening end 13a of the valve port guide 11 is bent outwardly so as to be hooked on the concave portion 17, and is crimped.
The diaphragm 7 is held between 4 and 15. The diaphragm holder 14 on the lower surface of the diaphragm 7 has its outer peripheral side placed on a receiving surface 18 provided on the valve box 4.

A valve stem guide 19 is fixed on the upper surface of the diaphragm retainer 15. The valve stem guide 19 is provided at the center of a cylindrical outer ring portion 20 having a predetermined diameter and a cylindrical guide portion longer than this. Are arranged on the inner wall of the outer ring part 20, and are divided by the outer ring part 20, the guide part 21, and the support pieces 22, 22a. The formed hollow portions are formed as flow passages 23, 23a,. Numeral 24 is a disk-shaped fixing portion projecting outward from the lower portion of the outer wall of the outer ring portion 20.The solid portion 24 is fixed on the concave portion 17, and the valve stem guide 19 is integrally fixed to the diaphragm retainer 15. ing.

Numeral 25 denotes a valve body which is provided on the valve seat 13 so as to be detachable. A valve stem 26 protruding toward the secondary side is provided upright at the center of the valve body 25, and the valve stem 26 is connected to the valve stem guide 19. Slidably penetrates the guide portion 21. The valve stem 26 is provided with a flange-shaped spring receiver 27 at the tip, and forms an upper end surface of the guide portion 21 facing the spring receiver 27 as a separate spring receiver 28, and compresses the lift spring 29 between the two spring receivers 27, 28. It is interposed and urges the valve body 25 to close. Further, an adjusting spring 30 is interposed between the secondary-side diaphragm retainer 15 and the upper surface of the secondary-side flow path 6 (in the spring box 8) to press the diaphragm 7 toward the primary-side flow path 5 side. It is energizing like.

The control chamber 9 has an opening at the top and an inner bottom.
A through hole 32 is provided at the center of 31 so as to communicate with the secondary flow path 6 and to correspond to the valve rod 26. Reference numeral 33 denotes an adjusting rod which is connected to the valve rod 26 and forcibly opens the valve body 25. The adjusting rod 33 is longer than the adjusting chamber 9 and is slidably inserted into the through hole 32, and the lower end thereof is valved. It is spaced apart on a bar 26. The adjusting rod 33 is
The flange pieces 34 and 34a are provided above and below the central portion, and the lower flange piece 34 is provided.
a is a spring receiver, and a return spring 35 is interposed between the spring receiver 34a and the inner bottom 31 of the adjustment chamber 9 in compression. Then, a screw lid 36 that slidably penetrates and projects the adjustment rod 33 is screwed into the upper opening of the adjustment chamber 9, and the upper flange piece 34 of the adjustment rod 33 is pressed by a lower portion of the screw lid 36. , Adjust the elasticity of the return spring 35,
The adjusting rod 33 is protruded from the adjusting chamber 9 (screw lid 36) so as to be able to protrude and retract.

Reference numeral 37 denotes a lever device for opening and closing the valve body 25 by pressing and releasing the adjusting rod 33 protruding to the top of the main body (the control chamber 9). The lever device 37 is mounted on the top 9 of the main body. The first and second support shafts 39,
It comprises an operating lever 41 which can be pivoted back and forth at 40.

The support fitting 38 is integrally formed of a material having elasticity such as a spring steel material which does not cause plastic deformation, and is provided with a mounting portion 42 formed of a C-type snap ring which is externally mounted on the top 9 of the main body.
A pair of rectangular bearing plates 43 and 43a are provided on the left and right end portions of the mounting portion 42 so as to face each other with the diameter width of the mounting portion 42 facing each other. 44,
44a is an open end of the mounting portion 42, and the open ends 44, 44a
Are provided at symmetrical positions between the bearing plates 43 and 43a. or,
The first and second support shafts 39 and 40 of the operating rod 41 are respectively provided with arc-shaped orbits 45, 45a, 46 and 46a through the bearing plates 43 and 43a.
Each of the circular orbits 45, 45a, 46, 46a of the support shaft 39 and the second support shaft 40 is on the circumferences S, S1 intersecting at the same radius R with the second support shaft 40 and the first support shaft 39 as the center of rotation. And the starting ends 4 of the arc-shaped orbits 45, 45a, 46, 46a of the first support shaft 39 and the second support shaft 40.
7, 47a, 48, 48a are arranged at the rotation center positions 47, 47a, 48, 48a of the first support shaft 39 and the second support shaft 40 on the same horizontal line.

With the support fitting 38 attached to the top 9 of the main body, the starting ends 47, 47 of the circular orbits 45, 45a of the first support shaft 39 are provided.
a is arranged on the vertical line above the adjusting rod 33, and the arc trajectories 46, 46a of the second supporting shaft 40 about the first supporting shaft 39 as the center of rotation project from the starting ends 48, 48a of the adjusting rod 33 counterclockwise. Such an arc trajectory is provided so as to pass through the end portion, corresponding to approximately one quarter of the circumference S.
The ends 50, 50a of the 46, 46a are arranged at the vertical position of the first support shaft 39. Also, arcuate orbits 45 and 45a of the first support shaft 39 having the second support shaft 40 as the center of rotation are provided clockwise from the start ends 47 and 47a for a predetermined length, and the end ends 49 and 49a of the arcuate orbits 45 and 45a. Are not intersected by the circular orbits 46, 46a of the second support shaft 40.

The operating rod 41 has a metal plate formed in a substantially L-shaped cross section, and a bottom plate 51 and a front plate 52 provided upright at the front end thereof.
The bottom plate portion 51 is formed so as to protrude downward from a front portion thereof to a base end portion (a front end portion of the bottom plate portion 51) of the front plate portion 52, and forms such a portion as a protruding portion 51a. I have. Also, bottom plate
At the left and right ends at the center of the center, shaft support pieces 53 and 53a in the shape of a horizontally long plate are erected, and one end of the shaft support pieces 53 and 53a
The first support shaft 39 protrudes upwardly through the shaft holes 54, 54a at the protruding ends thereof, and the first support shaft 39 penetrating through the shaft holes 54, 54a.
3 and 53a, and a second support shaft 40 is provided at the left and right ends of the front plate portion 52 so as to be in parallel with the first support shaft 39. The back of the bottom plate portion 51 forms a handle 55 of the operating lever 41.

A first support shaft 39 and a second support shaft of the operating rod 41 are provided.
Each of 40 is movably mounted on arc tracks 45, 45a, 46, 46a penetrating the bearing plates 43, 43a of the support fitting 38, while being spaced from the upper outer periphery of the main body top 9 by the thickness of the mounting portion 42. The mounting portion 42 of the support bracket 38 is rotatably mounted on the top 9 of the main body in the groove portion 56 which is largely engraved to form the lever device 37. In such a state, the operating lever 41 is provided with a bay portion 51a of the bottom plate portion 51.
Is arranged above the adjusting rod 33 so as to be swingable forward with a first support shaft 39 and swingable rearward with a second support shaft 40.

Here, the first support shaft 39 of the operating lever 41 and the operating lever 39
The distance X between the front plate portions 52 of the 41 is longer than the distance Y between the bottom plate portion 51 of the operating rod 41 and the first support shaft 39, and the front plate portion 52 is
Is set to the length L for pushing down to the valve opening position.
The second support shafts 39, 40 are connected to these circular orbits 45, 45a, 46, 46a.
From the normal posture of the operating lever 41 disposed at the starting ends 47, 47a, 48, and 48a, the first supporting shaft 39 located at the fulcrum positions (starting ends of the arc-shaped orbits 45, 45a) 47, 47a is used as a supporting point.
By swinging the front shaft 41 forward, the second support shaft 40
From the start end 48, 48a along the arc orbit 46, 46a to the end
50, 50a, and the second support shaft 40 is moved to the circular orbits 46, 46a.
When the front plate 52 reaches the ends 50 and 50a of the
By pressing the adjustment rod 33 projecting downward from the vertical direction, the first support shaft 39 supported at the fulcrum positions 47 and 47a holds the distance X (L) with the front plate portion 52, Adjustment rod 33
Is maintained so that the valve body 25 is forcibly opened.

A first support shaft having the second support shaft 40 as a center of rotation.
The 39 arc orbits 45, 45a are, as described above, their starting ends 47, 47.
The bottom plate 51 extends the adjusting rod 33 from the rotation center position 47, 47a of the second support shaft 40 (position where the first support shaft 39 is a fulcrum) by a predetermined length clockwise from a. Since it is provided over the range that can be pressed, the operating rod 41 arranged on the adjusting rod 33
From the normal posture, the second support shaft 40 located at the fulcrum position 48, 48a for swinging backward is used as a fulcrum, and the first support shaft 39 is used as an arc orbit 45, 45.
By swinging the operating lever 41 backward so as to move clockwise from its starting ends 47, 47a along the line a, the curved portion 51a of the bottom plate portion 51 pushes down the lower adjusting rod 33 and pushes down the operating rod 41. When the force is released, the adjusting rod 33 and the operating rod 41 return to the normal posture by the elastic force of the return spring 35.

Next, the operation of the relief device for a relief valve according to the present invention will be described. In the main body 1, when the pressure in the primary flow path 5 rises above the secondary flow path 6, the diaphragm 7 is pressed against the secondary flow path 6 against the elastic force of the adjusting spring 30.
The valve stem 26 moves together with the diaphragm 7, and when its tip contacts the lower end of the adjusting rod 33, the valve stem 26 is pushed back against the elastic force of the lift spring 29, thereby opening the valve body 25,
When the fluid flows from the primary flow path 5 to the secondary flow path 6 and the pressure in the primary flow path 5 decreases, the valve body 25 closes.

When the valve 25 is forcibly opened, the valve 25 shown in FIG.
By pivoting the operating lever 41 in the normal posture shown in (1) upward with the first support shaft 39 located at the fulcrum positions 47 and 47a as a fulcrum to cause the handle 55 of the operating lever 41 to swing forward, the front of the operating lever 41 is moved forward. Plate 52
The second support shaft 40 provided at the lower end of the first support shaft 39 at the lower vertical position of the first support shaft 39 from its start end 48, 48a along the arcuate track 46, 46a.
a, and the front plate 52 of the operating rod 41 is turned 90 degrees as shown in FIG. During this rotation, the front plate 52 of the operating lever 41
Presses down the protruding end of the adjusting rod 33 in the middle of the circular orbits 46, 46a, and when the second support shaft 40 reaches the terminal ends 50, 50a of the circular orbits 46, 46a, the adjusting rod 33 is lowered. Press vertically.

In this state, the distance between the bottom plate 51 of the operating lever 41 and the first support shaft 39 is longer than the distance Y, and the front plate 52 of the operating lever 41
When the distance X between the first support shaft 39 and the front plate portion 52 set to the length L for pushing down the adjusting rod 33 to the valve opening position is the first supporting point at the fulcrum positions 47 and 47a on the extension of the adjusting rod 33. Since it is held by the bearing plates 43 and 43a that support the shaft 39, the front plate portion 52 of the operating rod 41 pushes down the lower adjustment rod 33 to the valve opening position as shown in FIG. The valve state is maintained.

When the operation of the valve body 25 is confirmed, the operating lever 41 swings backward, that is, swings downward so as to push down the handle 55 of the operating lever 41, so that the operating lever 41 is located at the fulcrum positions 48 and 48a. With the support shaft 40 as a fulcrum, the first support shaft 39 moves clockwise from the start ends 47, 47a on the arc-shaped orbits 45, 45a, and as shown in FIG.
When the curved portion 51a of the bottom plate portion 51 in 41 depresses the adjusting rod 33 located below and releases the pressing force on the operating rod 41, the elastic force of the return spring 35 causes the operating rod 41 and the adjusting rod 33 to be shown in FIG. Return to normal posture.

[0022]

In summary, the present invention provides a valve body through a valve stem 26.
The control rod 25 is connected to the main body 9 by a spring 35 so as to be able to protrude and retract from the top 9 of the main body.
In the lever device 37 of the relief valve provided with the operation lever 41 for opening and closing the operation lever 25, the operation lever 41 is formed to have a substantially L-shaped cross section, and the bottom plate portion 51 of the operation lever 41 is disposed above the adjustment rod 33 to move forward and backward. The first support shaft 39 is provided above the bottom plate portion 51 so as to be swingable, and the second support shaft 40 is provided on the front plate portion 52 standing upright on the bottom plate portion 51 so as to be directly parallel to the first support shaft 39. The distance X between the support shaft 39 and the front plate portion 52 is longer than the distance Y between the bottom plate portion 51 and the first support shaft 39, and the length L of the front plate portion 52 pushing down the adjusting rod 33 to the valve opening position. After the setting, the arc 41 of the second support shaft 40 having the first support shaft 39 as the center of rotation is positioned at the position 4 where the operating rod 41 is supported by the second support shaft 40.
Since it is provided from 8, 48a to the hanging position of the first support shaft 39 on the top 9 of the main body through the protruding end of the adjusting rod 33, the first support shaft 39 is provided at the fulcrum positions 47, 47a when the valve is forcibly opened. By pivoting the operating lever 41 forward with the pivot as a fulcrum, the second supporting shaft 40 provided on the front plate portion 52 of the operating lever 41 is moved along its arcuate tracks 46, 46a at its starting end (the operating lever 41 pivots on the second supporting shaft 40). Move from 48, 48a to the end 50, 50a of the vertically lower position of the first support shaft 39,
During this movement, the front plate portion 52 of the operating rod 41 presses the projecting end of the adjusting rod 33 in the middle of the circular orbits 46 and 46a downward, and the second support shaft 40 causes the ends 50 and 50a of the circular orbits 46 and 46a. , The fulcrum positions 47, 47 of the forward swing on the extension of the adjustment rod 33
By disposing the front plate 52 in the vertical direction having the distance X (L) from the first support shaft 39 supported by the
The adjustment rod 33 can be pressed and held vertically downward against the elastic force of
The valve 25 can be kept open.

A first support shaft having the second support shaft 40 as a center of rotation.
The operation of the valve body 25 is confirmed since the 39 circular arc tracks 45 and 45a are provided from the positions 47 and 47a where the operating rod 41 is the fulcrum of the first support shaft 39 and the bottom plate portion 51 can press the adjusting rod 33. At times,
By swinging the operating lever 41 backward with the second support shaft 40 as a fulcrum at the fulcrum positions 48 and 48a, the bottom plate portion 51 of the operating lever 41 moving along the arc-shaped orbits 45 and 45a pushes down the adjusting rod 33 at the lower part thereof. Accordingly, it is possible to confirm that the valve body 25 is working normally by responding from the operating rod 41 that the elastic force of the return spring 35 is acting on the adjustment rod 33, and then release the operating rod 41 to release the return spring 35. Due to the elastic force, the operating rod 41 and the adjusting rod 33 can be returned to the normal posture, and the disadvantage that the valve is left in the open state as in the related art can be eliminated.

Therefore, according to the present invention, by swinging the operating rod 41 forward or backward, when the operating force on the operating rod 41 is released, the push-down state of the adjusting rod 33 is maintained, or the adjusting rod 33 is returned to the normal posture. By switching the swinging operation of the operating lever 41 forward or backward, the operation for forcibly opening the valve body 25 and the operation for confirming the operation of the valve body 25 are distinguished,
In particular, it is possible to eliminate the problem caused by leaving the valve in the open state when the operation of the valve body 25 is confirmed.

Further, a mounting part 42 formed of a C-shaped retaining ring is provided on the support fitting 38 provided with the operating rod 41, and the mounting part 42 is attached to the top 9 of the main body.
The lever device 37 can be mounted by a simple operation of opening the mounting portion 42 using a dedicated jig for a C-shaped snap ring and fitting the groove into the groove portion 56. In addition, the lever device 37 is a two-piece article of the support bracket 38 and the operating rod 41, and has an extremely small number of parts as compared with the conventional article.
In addition, the number of steps for attaching to the main body 1 is reduced, and work efficiency is improved.
In addition, since the lever device 37 is not attached by the support nut h as in the related art, it is not necessary to engrave a male screw on the top 9 of the main body, the manufacturing cost can be reduced, and depending on the installation location of the relief valve a, The practical effect is extremely large, for example, the disadvantage that the support nut i is loosened and comes off due to external factors such as vibration and the relief valve a may not function can be solved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a relief valve body.

FIG. 2 is a plan view of a lever device.

FIG. 3 is a front view of the lever device.

FIG. 4 is a side view of the lever device.

FIG. 5 is a plan view of a support fitting.

FIG. 6 is a front view of a support fitting.

FIG. 7 is a side view of the support fitting.

FIG. 8 is a plan view of the operating lever.

FIG. 9 is a front view of the operating lever.

FIG. 10 is a side view of the operating lever.

FIG. 11 is a sectional view of a main part showing a normal posture of the operating lever.

FIG. 12 is a cross-sectional view of a main part showing a forcible valve opening state by a lever.

FIG. 13 is a cross-sectional view of a main part showing an operation confirmation state by a lever.

FIG. 14 is a sectional view of a conventional relief valve.

FIG. 15 is a perspective view showing an attached state of the lever device.

[Explanation of symbols]

 9 Main body top 25 Valve body 26 Valve rod 33 Adjustment rod 35 Spring 37 Lever device 38 Support bracket 39 First support shaft 40 Second support shaft 41 Operating rod 42 Mounting part 45, 45a Circular path 46, 46a Circular path 47, 47a Support point position 48, 48a Support point position 51 Bottom plate 52 Front plate 56 Groove L Length X Distance Y Distance

Claims (2)

[Claims] An escape rod provided with a operating rod that opens and closes a valve body by pressing and releasing a control rod that is connected to a valve body via a valve rod and that is provided at the top of the main body so as to be freely retractable by a spring. In the lever device of the valve, the operating rod is formed to have a substantially L-shaped cross section, the bottom plate portion of the operating rod is arranged above the adjustment rod, and is swingably movable back and forth, and the first support shaft is provided above the bottom plate portion. At the same time, the second support shaft is provided on the front plate portion standing upright on the bottom plate portion, in parallel with the first support shaft, and the distance between the first support shaft and the front plate portion is longer than the distance between the bottom plate portion and the first support shaft. And the front plate portion is set to a length that pushes down the adjusting rod to the valve opening position, and the arc-shaped trajectory of the second support shaft about the first support shaft as the rotation center is a position where the operating rod uses the second support shaft as a fulcrum. Through the projecting end of the adjustment rod from the first
A range in which the bottom plate portion can press the adjusting rod from the position where the operating rod moves the arc trajectory of the first support shaft with the second support shaft as the center of rotation, provided over the hanging position of the support shaft. A lever device for a relief valve, wherein the lever device is provided over a range. 2. The mounting bracket according to claim 1, wherein a mounting portion comprising a C-shaped retaining ring is provided on the supporting bracket provided with the operating lever, and the mounting portion is attached to a groove formed on the outer periphery of the top of the main body. Lever device for relief valve.