JPH07208523A - Coil spring and governor using the same - Google Patents

Abstract

PURPOSE:To provide a coil spring whose housing space can be decreased, and a governor capable of being miniaturized by using the coil spring. CONSTITUTION:A coil spring 21 is restricted by a plurality of thin flexible wires 35 difficult to be extended, so as not to be extended in excess of the set length shorter than the free length. Respective flexible wires 35 are fixed by respectively tying respective one ends to fixing positions 36 facing the upper end of the coil spring 22 in the state where the coil spring 21 is compressed, and also respectively tying respective other ends to fixing positions 37 facing the lower end of the coil spring 21, so as to be attached to the coil spring 21. When the coil spring 21 is used as a pressure governing force adjusting spring in a governor, the housing space of the coil spring 21 can be decreased by presetting the set length to the value longer than the using length as the length in the using state by approximately 10%.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil spring having a relatively small spring constant and a long free length, and a governor using the coil spring as a spring for adjusting pressure.

[0002]

2. Description of the Related Art Conventional coil spring 1 and coil spring 1
FIG. 9 shows a governor 2 using the. The governor 2 is on the downstream side by lowering the primary pressure P1 of the primary side 3 when the city gas is supplied from the primary side 3 on the upstream side to the secondary pressure P2 which is a lower pressure. Supply to the secondary side 4. Even if the flow rate of city gas supplied to the downstream side 4 fluctuates, the secondary pressure P2
The purpose of the governor 2 is to regulate the pressure so that the fluctuation does not occur. On the upper part of the governor 2, the coil spring 1 as a pressure adjusting spring is compressed and contracted from a free length state which is a length in an open state indicated by a two-dot chain line to a working length which is a length in a setting state of the secondary pressure P2. Be prepared and equipped. The coil spring 1 presses the upper surface of the diaphragm 5. On the other hand, the pressure adjusting chamber 6 below the diaphragm 5 communicates with the secondary side 4 through the adjusting pressure outlets 7 and 8. The secondary pressure is set by adjusting the adjusting screw 10 provided above the storage location 9 for storing the coil spring 1.

When the secondary pressure P2 becomes smaller than the set value, the pressure in the pressure adjusting chamber 6 decreases and the diaphragm 5 is pushed down by the coil spring 1. Along with this, the valve body 12 connected to the diaphragm 5 is pushed down through the connecting rod 11 in which a communication passage is formed. When the valve body 12 is pushed down, the gap between the valve body 12 and the valve seat 13 increases, and the flow rate of the gas flowing from the primary side 3 to the secondary side 4 through this gap increases. As a result, the secondary pressure P2 rises and approaches the set pressure. When the secondary pressure P2 becomes larger than the set value, the diaphragm 5 is pushed upward and the valve body 12 and the valve seat 13 are shut off from each other. When gas is used, the secondary pressure P2 drops.

The coil spring 1 has a small spring constant in order to open and close the valve body 12 in response to a minute change in the secondary pressure P2. Further, since a spring having a small spring constant is used, in order to obtain a pressing force necessary for setting the secondary pressure P2, the coil spring 1 is used after being compressed from the free length to about half the free length. To be Therefore, the coil spring 1 has a longer free length than the used length.

[0005]

In the conventional governor, the coil spring 1 having a long free length is provided with the adjusting screw 10 and the diaphragm 5.
Since the coil spring 1 is used by being compressed to the used length, the storage location 9 for storing the coil spring 1 needs to have a height corresponding to the storage of the coil spring 1 having a free length, which causes the storage location 9 to become large. . Further, when the storage space becomes large in this way, when the coil spring 1 is stored in the storage location 9, it is necessary to compress the coil spring 1 with the adjusting screw 10 from the free length to the used length. For this reason, it takes a lot of time to store it. If it is stored in a compressed state in advance, the storage location 9 can be shortened, but when removing it, there is a danger that the adjusting screw 10 and the coil spring 1 will suddenly pop out like a surprise box, which is dangerous. is there.

In order to reduce the size of the storage location 9, a method of using a coil spring 1 having a slightly larger spring constant,
There is a method in which the coil spring 1 is finely classified according to the setting range of the secondary pressure, and the coil spring corresponding to the value of the secondary pressure to be set is selected and used. If the spring constant is increased, the performance of the governor deteriorates, and if the coil springs 1 are finely classified, the number of types of the coil springs 1 increases and the cost increases.

An object of the present invention is to provide a coil spring which can reduce the storage space, and a governor which can be miniaturized by using the coil spring.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a coil spring used in a state of being compressed to a length equal to or shorter than a preset length, the coil spring being attached to the coil spring and exceeding the preset length with respect to the coil spring. The coil spring is provided with a restraint member that restrains it from extending and allows it to shrink below the preset length.

The present invention also provides a spring for adjusting pressure, comprising:
A governor using the coil spring according to claim 1.

[0010]

According to the present invention, the restraining member is attached to the coil spring which is used in a state of being compressed to a predetermined length or less. The restraint member restrains the coil spring from extending beyond the set length, and allows the coil spring to contract below the set length. The restraint member restrains the coil spring to a set length that is a little longer than the actually used length of the coil spring, and the surplus length obtained by subtracting the used length from the free length can be reduced. The storage space can be reduced.

Further, according to the present invention, the above-mentioned coil spring is used in the governor as a spring for adjusting pressure. Therefore, the storage space for the coil spring can be reduced, and the governor can be downsized.

[0012]

1 shows the appearance of a coil spring 21 according to an embodiment of the present invention. FIG. 1 (1) is a plan view and FIG. 1 (2) is a front view. The coil spring 21 is provided with a plurality of flexible wires 35 which are realized by a wire rope or the like and which are thin, easy to bend and hard to extend. Each flexible line 35 is
With the coil spring 21 compressed from the free length, one end of the coil spring 21 is fixed to the corresponding fixed position 36 of the upper end of the coil spring 21.
To the corresponding fixing position 37 at the lower end of the coil spring 21.
Be attached to. The fixed positions 36 and 37 divide the outer circumference of the upper end of the coil spring 21 at equal intervals so that, for example, a straight line connecting the fixed positions 36 and 37 corresponding to each other passes through the center of the coil spring 21. To be decided respectively. If you stretch each flexible wire 35,
The upper end surface and the lower end surface of the coil spring 21 are the coil spring 21.
Be perpendicular to the axial direction of.

In this way, the coil spring 21 is restrained by the flexible wire 35 so as not to extend beyond the set length shorter than the free length. The set length is adjusted by changing the length of the flexible wire 35. When the coil spring 21 is compressed to the set length or less, the flexible wire 35 bends and does not prevent the coil spring 21 from being compressed.

In FIG. 2, the coil spring 21 accommodates the storage space 3
4 shows the state when it is used. The coil spring 21 is fitted into the storage space 34, is sandwiched by the upper and lower end plates 38 and 39, and is in a state of the working length H2 further compressed by about 10% from the set length H1.

The coil spring 21 is constrained by a flexible wire 35 so as not to extend beyond a preset length. When the free length is much longer than the set length, the storage space 34 for the coil spring 21 can be significantly reduced by presetting the set length to be, for example, about 10% longer than the used length.

FIG. 3 is a sectional view showing the structure of a governor 22 provided with a coil spring 21 as a pressure regulating spring. The governor 22 includes a chamber 40 provided with a coil spring 21 and a diaphragm 25, and a casing 41 provided with a valve body 32 and the like, and provides a primary pressure P3 when the city gas is supplied from the primary side 23. , And the secondary pressure P4, which is a lower pressure, is supplied to the secondary side 24.

The inside of the chamber 40 is airtightly partitioned by the diaphragm 25, and two pressure adjusting chambers 2 are provided above and below.
6, 26a are formed. A coil spring 21 is provided at a storage location 29 above the diaphragm 25 between the spring receiver 43 attached to the upper surface of the diaphragm 25 and the adjusting screw 30 in a compressed state from the set length to the used length. The coil spring 21 presses the upper surface of the diaphragm 25 downward. One end of the connecting rod 31 is attached to the lower surface of the diaphragm 25. The other end of the connecting rod 31 is hermetically inserted into the casing 41, and the valve element 32 is attached to the tip. Correspondingly, a valve seat 33 is formed in a portion of the casing 41 that abuts the valve body 32.
When the governor is in conduction, the primary side 23 and the secondary side 24 communicate with each other through the gap 42 formed between the valve body 32 and the valve seat 33.

Between the valve body 32 and the valve seat 33, when the diaphragm 25 is pushed by the coil spring 21 and bent downward, the connecting rod 31 and the valve body 32 are pushed downward, and the gap 42 becomes large. When the gap 42 becomes large, the flow rate of city gas flowing from the primary side 23 to the secondary side 24 increases, and the secondary pressure P4 rises. On the contrary, when the gap 42 becomes smaller, the secondary pressure P4 drops.

A pressure adjusting chamber 26 below the diaphragm 25
a is in air-tight communication with the secondary side 24 through the adjusting pressure outlets 27 and 28 provided in the casing 41 and the valve body 32, and further via the connecting rod 31 having a hollow structure, and the lower surface of the diaphragm 25. A secondary pressure P4 is applied to. On the other hand, the pressure adjusting chamber 26 on the upper side of the diaphragm 25 communicates with the external atmospheric pressure, and the atmospheric pressure P5 and the pressing force of the coil spring 21 are applied to the upper surface of the diaphragm 25. The pressing force by the atmospheric pressure P5 and the coil spring 21 and the pressing force by the secondary pressure P4 are balanced, and the secondary pressure P4 is kept at a constant value. The secondary pressure P4 is changed by changing the adjusting screw 30 up and down.
The gap 42 between the valve element 32 and the valve seat 33 is changed and set and adjusted.

When the secondary pressure P4 falls below the set value, the pressure in the pressure adjusting chamber 26a drops, and the diaphragm 25 is pushed down by the coil spring 21. As a result, the gap 42 is generated.
Becomes larger, the secondary pressure P4 rises, and the secondary pressure P4 is kept constant. On the contrary, if the secondary pressure P4 exceeds the set value,
The diaphragm 25 is pushed up, and the gap 4
2 decreases, and the secondary pressure P4 decreases. A coil spring 21 having a small spring constant is selected in order to sensitively respond to a slight change in the secondary pressure P4 and correct the secondary pressure P4 to a set value. Further, generally, the secondary pressure P4 is the atmospheric pressure P.
The diaphragm 25 is larger than 5 and resists the secondary pressure P4.
In order to press, the coil spring 21 having a long free length is used, and the coil spring 21 is used by being compressed to about half the free length.

Therefore, when the coil spring 21 is used as the spring for adjusting pressure in the governor 22, the space 29 for accommodating the spring for adjusting pressure in the governor 22 conventionally requires a space longer than the free length of the spring, but Coil spring 2
Since 1 is preliminarily constrained by the flexible wire 35 so as not to extend beyond the set length, the set length is set to 10
%, The height of the storage location 29 can be reduced to about half, and the governor 22 can be downsized.

Further, since the coil spring 21 is restrained in advance in a state of being slightly longer than the used length, the coil spring 2
When 1 is attached to the governor 22 and is compressed by the adjusting screw 30, the operator may contract from the set length to the used length. Even when the coil spring 21 is taken out from the governor 22, the adjusting screw 30 and the coil spring 21 do not pop out. Therefore, the work of attaching and detaching the coil spring 21 can be performed easily and safely.

FIG. 4 shows a coil spring 2 according to another embodiment of the present invention.
4A is a partial cross-sectional view showing the configuration of 1a, FIG. 4A shows a state in which the spring main body 45 is constrained to a set length by a restraining member 44, and FIG. 4B shows a coil spring 21a having a set length. It shows a state in which it is compressed beyond. FIG. 5 is a diagram showing the external appearance of the coil spring 21a when viewed from below.
FIG. 6 is a perspective view showing the configuration of the restraint member 44. The coil spring 21a includes a spring body 45 and a restraining member 44 that restrains the spring body 45 so as not to extend beyond a set length shorter than the free length.

The restraint member 44 comprises an outer cylinder 48 and an inner cylinder 49. The outer tubular body 48 has an inward edge 50 formed at one end, and the tubular portion 53 is inserted into the spring body 45.
And a flange portion 46 formed so as to project radially outward from the other end of the tubular portion 53 and having a diameter larger than that of the spring body 45. A plurality of notches 51 are formed in the inward edge 50. The inner tubular body 49 has an inward edge 5 of the outer tubular body 48 at one end.
A plurality of protrusions 52 that engage with 0 are formed, and the spring body 45
And a flange portion 47 which is formed so as to project radially outward from the other end of the tubular portion 54 and has a diameter larger than that of the spring body 45. The outer diameter of the tubular portion 53 is selected so as not to hinder the expansion and contraction operation of the spring body 45, and the outer diameter of the tubular portion 54 is set to be slightly smaller than the inner diameter of the inward edge 50 of the tubular portion 53. Can freely communicate with the inside of the tubular portion 53. Further, the same number of protrusions 52 and notches 51 are provided at positions that can correspond to each other so that the insertion of the tubular portion 54 into the tubular portion 53 is not hindered.

The restraint member 44 is attached to the spring body 45 by
The outer cylinder 48 and the inner cylinder 49 are inserted from both sides of the spring body 45. The notch 51 of the outer cylindrical body 48 and the protrusion 52 of the inner cylindrical body 49 are aligned with each other, and the spring body 45 is pressed from both sides, and the protrusion 52 is fitted into the cylindrical portion 53 through the notch 51. The spring body 45 is pushed and contracted until it fits in. When the protrusion 52 is fitted into the cylindrical portion 53, the inner cylinder 49 or the outer cylinder 48 is rotated in the circumferential direction in that state, so that even if the pressing operation on the spring body 45 is released, the protrusion 52 is protruded. 52 and the inward edge 50 are engaged, and FIG.
As shown in, the coil spring 21a is constrained so as not to extend beyond the set length. Therefore, the restraint member 44
Is formed of a hard material such as metal or resin so that the spring body 45 can be restrained against the elastic force of the spring body 45.

The set length of the coil spring 21a is the outer cylinder 4
8 and the inner cylindrical body 49 are set by changing the axial lengths thereof, and are set to be, for example, about 10% longer than the used length which is the length when the coil spring 21a is actually used. The coil spring 21a is shown in FIG.
When the coil spring 21a is pressed and the spring main body 45 contracts as shown in FIG. 5, the tubular portion 54 fits into the tubular portion 53 accordingly, so that the compression of the spring main body 45 is not hindered. There is.

Therefore, according to the coil spring 21a,
Since the restraint members 44 are fitted from both sides of the spring body 45 so that the spring body 45 does not extend beyond the set length, the restraint members 44 can be easily attached to the spring body 45. In this embodiment, the inner cylinder 49
Although the inward projection 52 is provided in the outer cylindrical body 4
8 is provided not with the inward edge 50 but with the outward protrusion, and correspondingly, the inner cylinder 49 is provided with the notch 52 instead of the outward edge so that the outward protrusion and the outward edge are formed. And may be engaged.

FIG. 7 is a partial sectional view showing the structure of a coil spring 21b according to still another embodiment of the present invention.
Shows a state in which the spring body 45 is constrained to a set length by the constraining member 44. FIG. 7B shows the coil spring 21b.
Shows a state in which it is compressed beyond the set length. Figure 8
It is a figure which shows the external appearance when the coil spring 21b is seen from a lower part. 7 and 8, the same reference numerals are used for parts corresponding or similar to those of the coil spring 21a shown in FIGS. 4 and 5.

The characteristic feature of the coil spring 21b is that the restraining member 44 of the coil spring 21a has a spring body 45.
However, in the coil spring 21b, the restraining member 44 is located outside the spring body 45, and restrains the spring body 45. The restraint member 44 is
Since the restraint is performed from the outside of the spring body 45, the spring body 45
The flange portion 46 of the outer tubular body 48 and the flange portion 47 of the inner tubular body 49 that come into contact with both ends of the
Is formed so as to project inward in the radial direction. The tubular portion 54 of the inner tubular body 49 is provided with an outward edge 55 formed with a plurality of notches 51a, and the outer tubular body 4 is correspondingly provided.
The tubular portion 53 of No. 8 is provided with a plurality of inward projections 52a that engage with the outward edges 55.

As in each of the embodiments, the coil springs 21 and 21
By constraining a and 21b and making the set length shorter than the free length, it is possible to reduce the material and space required when packaging and storing the coil springs 21, 21a and 21b as parts. You can Further, a coil spring having a small spring constant and a long free length easily buckles when shortened, but if shortened in advance, buckling can be prevented.

[0031]

As described above, according to the present invention, since the coil spring is restrained by the restraining member so as not to extend beyond the set length shorter than the free length, the free length is much shorter than the used length. When the set length is set to be slightly longer than the working length, the storage space of the coil spring can be significantly reduced. Also,
When the coil spring is mounted, the coil spring is set to be slightly longer than the used length in advance, so that the coil spring does not have to be compressed from the free length to the used length, and the mounting operation can be easily performed.

Further, according to the present invention, since the above-mentioned coil spring is used as a spring for adjusting pressure in the governor,
The storage space for the spring can be reduced. When the storage space is small, the governor can be downsized, and the governor can be attached to a narrow space, so that the cost can be reduced. Also, since the coil spring is set in advance to a state slightly longer than the used length by the restraint member, the coil spring does not suddenly pop out when taking out the coil spring from the governor,
It can be taken out safely.

[Brief description of drawings]

1A and 1B are views showing the outer appearance of a coil spring 21 according to an embodiment of the present invention, FIG. 1A is a top view, and FIG. 1B is a front view.

FIG. 2 is a diagram showing a state where the coil spring 21 of FIG. 1 is provided in a storage space 34 and is being used.

FIG. 3 is a governor 22 provided with the coil spring 21 of FIG.
3 is a cross-sectional view showing the configuration of FIG.

FIG. 4 is a partial cross-sectional view showing the structure of a coil spring 21a according to another embodiment of the present invention, and FIG. 4 (1) shows a state in which a spring body 45 is constrained by a constraining member 44 to a set length. 4 (2) shows a state in which the coil spring 21a is compressed beyond the set length.

5 is a bottom view of the coil spring 21a of FIG.

FIG. 6 is a perspective view showing a configuration of a restraint member 44.

FIG. 7 is a coil spring 21b according to still another embodiment of the present invention.
7 (1) shows a state in which the spring main body 45 is constrained to a set length by the restraining member 44, and FIG. 7 (2) shows the coil spring 21b having a set length. The state of being compressed beyond is shown.

8 is a bottom view of the coil spring 21b of FIG.

FIG. 9 is a cross-sectional view showing a configuration of a conventional coil spring and a governor using the coil spring.

[Explanation of symbols]

 21, 21a, 21b Coil spring 22 Governor 23 Primary side 24 Secondary side 25 Diaphragm 29 Storage location 30 Adjusting screw 31 Connecting rod 32 Valve body 33 Valve seat 34 Storage space 35 Flexible line 40 Chamber 41 Casing 44 Restraint member 45 Spring Main body 46, 47 Flange portion 48 Outer cylinder 49 Inner cylinder

Claims (2)

[Claims] 1. A coil spring used in a state of being compressed to a length equal to or shorter than a preset length, the coil spring being attached to the coil spring and constraining the coil spring so as not to extend beyond the preset length, A coil spring, comprising: a restraining member that allows a contraction to a set length or less. 2. A governor, wherein the coil spring according to claim 1 is used as a spring for adjusting pressure.