JPH0138650Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to governors, and more particularly to improvements to the drive shaft in so-called Reynolds governors.

Referring to FIG. 1, a drive shaft 1 in a conventional so-called Reynolds governor includes an upper shaft 2 connected to a drive means (not shown) and a lower shaft 3 concentrically connected. The lower shaft 3 is provided with externally threaded portions 4 and 5 at both ends in the axial direction, and has an operating portion 6 protruding radially outward at approximately the center thereof. The lower part of the lower shaft 3 is concentrically screwed into the valve body 16 and protrudes downward, and a cap nut 7 is screwed onto the protruding portion. The upper part of the lower shaft 3 concentrically passes through the valve body 8 and is concentrically screwed into the lower end of the upper shaft 2.

By the way, such a so-called Reynolds governor is used, for example, as a governor in a city gas supply pipeline to reduce the gas pressure from a medium-low pressure of less than 3 kg/cm ² to an even lower pressure. Therefore, the governor must be disassembled during regular inspections about once a year or when a failure occurs. What is important when disassembling the governor is to check whether the valve bodies 16 and 8 are able to reliably shut off the valve; if complete shutoff cannot be ensured, this may cause an increase in the secondary pressure. This could lead to an accident.

To check the closing performance as described above, with the upper valve element 8 in contact with the valve seat 9, tighten the lower valve element 16 until it contacts the valve seat 10, and then The cap nut 7 is tightened to prevent it from loosening due to vibration, etc. Next, a bottom cover (reference numeral 53 in FIG. 3, which will be described later) provided at the lower part of the main body is attached, and low pressure gas is introduced into the downstream space 12 partitioned by the partition wall 11. Further, the pipe line connected to the downstream space 12 is closed to seal the downstream space 12, and a water column gauge communicating with the downstream space 12 is connected to the downstream space 12.
The shutoff performance of the valve bodies 8 and 16 is checked by checking whether the pressure of the gas sealed in the valve body changes. If there is a leak, apply soapy water to the valve holes 14 and 15 from the opening facing the upstream space 13 to check which valve seats 9 and 10 are leaking. Next, after extracting the low pressure gas from the downstream space 12, the bottom cover described above is removed, the valve body 16 is retightened as described above, and the same procedure as described above is repeated.

In such conventional technology, each time a leak is confirmed and the valve body 16 is retightened, the bottom cover, which is relatively heavy, must be removed and installed, making disassembly work troublesome. In addition, it takes a long time, resulting in poor work efficiency.

It is an object of the present invention to provide a governor that solves the above-mentioned technical problems and allows checking of closing performance to be performed easily and in a short time.

The present invention provides a valve seat facing downward in both parallel parts of a partition wall that partitions the inside of the main body into an upstream space and a downstream space along the gas flow direction and has a pair of mutually parallel upper and lower parallel parts. A pair of upper and lower valve holes are formed concentrically with each other, and a pair of upper and lower valve bodies that respectively abut on both the valve seats are fixed to a drive shaft that passes through these valve holes and is driven in the axial direction. The governor is provided with a side cover that can be opened and closed to close a first opening formed facing the upstream space between the two parallel parts on the side of the main body, wherein the drive shaft includes an upper shaft, a connecting shaft, A shaft and a lower shaft are concentrically connected in this order from top to bottom, and the upper valve body is inserted from the first opening and fixedly held by the upper shaft and the connecting shaft, and the lower valve body is inserted through the first opening and fixedly held by the upper shaft and the connecting shaft. The valve body is fixedly provided on the lower shaft and inserted through a second opening formed facing the downstream space of the main body, and the connecting shaft and the lower shaft are connected so that the distance between the two valve bodies can be freely adjusted. , the part to be adjusted is located in the upstream space between the two parallel parts and can be adjusted from the first opening, and the second opening can be opened and closed by a bottom cover. It is a governor that

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a system diagram showing a gas supply line in which a governor according to an embodiment of the present invention is used. The governor 20 according to the present invention is interposed between the upstream pipe line 21 and the downstream pipe line 22, and the gas transported from the upstream pipe line 21 at a medium-low pressure of, for example, less than about 3 kg/cm ² is Low pressure by governor 20 e.g. 150mm
The pressure is reduced to H ₂ O.

Within the body 23 of the governor 20 is a single drive shaft 2.
A pair of valve bodies 25 and 26 are fixedly provided in 4, and these valve bodies 25 and 26 are connected to valve holes 27 and 28.
Open and close. The upper part of the drive shaft 24 is the diaphragm 2
9, and further displaceably passes through the top of the main body 23 and is connected to a swingable lever 30. The end of this lever 30 is connected to a diaphragm 33 of an auxiliary ball disk 32 via a hanging rod 31.
Note that the lever 30 and the hanging rod 31 have valve holes 27,
Heavy pegs 34 and 35 for opening 28 are provided, respectively. Also, a downstream space 36 below the diaphragm 29 in the main body 23 of the governor 20
is connected to the downstream pipe line 22 via a relief pipe 38 equipped with an on-off valve 37. An on-off valve 39 is provided in the downstream pipe line 22 between the relief pipe 38 and the governor 20 .

The space below the diaphragm 33 in the auxiliary sphere 32 includes an adjustment pipe 40 and a medium pressure auxiliary governor 41.
and the upstream air passage 2 via the primary pressure adjustment pipe 42.
1, and is also connected to the downstream pipe line 22 via a regulating pipe 40, a low pressure auxiliary governor 43, and a secondary pressure regulating pipe 44. An on-off valve 45 is provided in the upstream pipe line 21 between the primary pressure adjustment pipe 42 and the governor 20, and the secondary pressure adjustment pipe 44 is located downstream of the on-off valve 39. It is connected to the conduit 22.

Assume that there is no demand for city gas downstream of the governor 20, and therefore the pressure in the downstream pipe 22 is relatively high. In this case, the low pressure auxiliary governor 43 is closed as shown in the second figure.
Further, the intermediate pressure auxiliary governor 41 controls the secondary pressure, for example.
Since the water column is set at 450 to 500 mm, the secondary pressure acts on the diaphragm 33 of the assisting ball disk 32 via the adjustment pipe 40. Therefore, the diaphragm 33 is pressed upward, and the lever 30 is pushed up, thereby causing both the valve holes 27 and 28 to be connected to the valve body 25,
26, and gas transport from the upstream pipe line 21 to the downstream pipe line 22 is blocked.

Next, when a demand for gas occurs downstream of the governor 20 and the pressure in the downstream pipe 22 decreases, the low pressure auxiliary governor 43 is opened, and the auxiliary sphere 3
2 is guided to the downstream pipe line 22. At this time, the intermediate pressure auxiliary governor 41 is also opened, but since the needle valve 85 is provided in the part of the regulating pipe 40 near the intermediate pressure auxiliary governor 41, the gas flow rate passing through the intermediate pressure auxiliary governor 41 is reduced. suppressed. Therefore, the pressure inside the adjustment tube 40 decreases, and the weight 34,
35 causes the lever 30 to be pushed down, and the valve holes 27 and 28 are opened accordingly.

When the pressure in the downstream pipe line 22 increases, the low pressure auxiliary governor 43 closes, the pressure in the regulating pipe 40 increases again, and the valve holes 27 and 28 are closed in the same manner as described above. In this way, the secondary pressure of the governor 20, that is, the pressure within the downstream pipe line 22 is controlled.

FIG. 3 is a sectional view showing the inside of the governor 20. A partition wall 48 is provided within the main body 23 of the governor 20 and has a pair of parallel portions 46 and 47 that extend in parallel vertically with an interval between them. The interior of the main body 23 is partitioned by the partition wall 48 into an upstream space 49 communicating with the upstream pipe line 21 and an upstream space 36 communicating with the downstream pipe line 22. each parallel section 46,
Valve holes 27 and 28 are concentrically formed in the valve hole 47 and extend vertically, and valve seats 50 and 51 are formed in these valve holes 27 and 28 facing downward.

FIG. 4 is a sectional view taken along the section line - in FIG. 3. A downstream space 36 is provided at the bottom of the main body 23.
An opening 52 facing the bottom is formed, and this opening 52 is closed by a bottom cover 53 so as to be openable and closable. Further, an opening 54 is formed in the side of the main body 23 and faces the upstream space 49 between the parallel portions 46 and 47 of the partition wall 48 . This opening 54 is closed by a side cover 55 so as to be openable and closable.
In addition, the bottom cover 53 and the side cover 55
is hermetically fixed to the main body 23 by bolts 56 and 57.

FIG. 5 is a sectional view showing the drive shaft 24. The drive shaft 24 includes an upper shaft 58, a connecting shaft 59, and a lower shaft 60.
It is constructed by connecting concentrically. The upper part of the upper shaft 58 is connected to the diaphragm 29, and is connected to the lever 30 by displaceably passing through the top of the main body 23. The lower end of this upper shaft 58 has an internal screw hole 6.
1 are formed concentrically. The connecting shaft 59 has a small diameter portion 63 having an external thread 62 to be screwed into the internal threaded hole 61, and a large diameter portion 64 which are concentrically and integrally connected, and the large diameter portion 64 has an internal thread. hole 6
5 are formed concentrically. The lower shaft 60 has an outer thread 81 that is screwed into the inner threaded hole 65, and a large diameter portion 32.
and a small diameter portion 83 are integrally connected in this order, and an external thread 84 is formed at the end of the small diameter portion 83 on the opposite side from the large diameter portion 82.

The valve body 25 that should come into contact with the upper valve seat 50 is formed in a substantially disk shape, and a connecting shaft 5 is provided in the center of the valve body 25.
A hole 66 through which the small diameter portion 63 of No. 9 is inserted is formed concentrically. An annular recess 67 is formed in the upper surface 25a of the valve body 25, and a seat packing 68 is fitted into the recess 67 so as to contact the valve seat 50. Further, a holding member 69 for holding down the seat packing 68 is provided above the valve body 25, and this holding member 69 has a hole 69 in the valve body 25.
A hole 70 concentric with and having the same diameter is bored.

The valve body 26 that should come into contact with the lower valve seat 51 is configured exactly the same as the valve body 25, and is
A seat packing 71 is provided that comes into contact with the valve body 26 , and a pressing member 72 is provided above the valve body 26 . Further, a hole 7 through which a small diameter portion 83 of the lower shaft 60 is inserted is provided in the center of the valve body 26 and the pressing member 72.
3 and 74 are formed concentrically and with the same diameter.

When fixing the valve body 26 to the drive shaft 24, first hold the small diameter portion 83 of the lower shaft 60 with the holding member 7.
2 and an external screw 84 that is inserted into the holes 74 and 73 of the valve body 26 from above and protrudes below the valve body 26.
Then, the nut 76 and the cap nut 77 are screwed together via the gasket 75. By tightening this nut 76 and cap nut 77, the presser member 7
2 and the valve body 26 are clamped and fixed by the large diameter portion 82 of the lower shaft 60 and the gasket 75.

The connecting shaft 59 is inserted through the opening 54 by inserting its small diameter portion 63 through the holes 66 and 70 of the valve body 25 and the holding member 69, and the outer thread 62 protruding from the holding member 69 is screwed into the internal threaded hole 61. Then, by tightening the valve body 25 until it comes into contact with the valve seat 50, it is connected to the upper shaft 58. In this connected state, the valve body 25
And the presser member 69 is a lower end surface 58a of the upper shaft 58.
and the large diameter portion 64 of the connecting shaft 59.

Lower shaft 6 to which holding member 72 and valve body 26 are fixed
0 screws the nut 78 onto the upper external thread 81 and inserts it from the opening 52, and then inserts the external thread 81 into the connecting shaft 59.
is screwed into the internal threaded hole 65 of the valve body 26 and tightened until the valve body 26 comes into contact with the valve seat 51. In this way,
The drive shaft 24 is constructed by concentrically connecting the upper shaft 58, the connecting shaft 59, and the lower shaft 60 in this order from top to bottom.

After installing the bottom cover 53, open/close valves 37, 3
The valves 9 and 45 are closed, and the closing performance of the drive rod 24 in the assembled state after the governor 20 is disassembled is checked. First, the governor 20 in the relief pipe 38
A water column gauge (not shown) is connected to the branch pipe 79 having an on-off valve 80 at a nearby position, and the on-off valve 37 is opened. Thereby, the downstream pipe line 2 is inserted into the downstream space 36 in the main body 23 of the governor 20.
Gas at low pressure at 2 is introduced. Here, the on-off valve 37 is closed to seal in the low pressure gas, and while observing the pressure drop in the downstream space 36 using the water column gauge, the opening 5 in the side of the main body 23 is closed.
Insert a tool such as an adjustable wrench from 4,
The large diameter portion 82 of the lower shaft 60 is rotated. Thereby, the outer thread 81 of the lower shaft 60 is screwed forward or backward within the inner threaded hole 65, and the distance between the two valve bodies 25, 26 is adjusted. Therefore, the valve seat 5 of the valve body 26
1 is adjusted, and the valve seat 51 of the valve body 26 is adjusted.
A reliable abutment is achieved. When it is confirmed by observing the water column gauge that there is no leakage, tighten the nut 78 and close both valve bodies 25 and 26.
Make sure that the distance between them does not change. After completing the above-described checking of the closing performance of both valve bodies 25 and 26, the opening 54 is closed with the side cover 55, and the assembly work after disassembly is completed.

FIG. 6 is a sectional view of another embodiment of the present invention,
Parts corresponding to the previous embodiments are given the same reference numerals. In this embodiment, the small diameter portion 83 of the lower shaft 60
An external thread 84 is cut along the entire length. This external thread 84 includes the lower valve body 26 and the presser member 7.
2 are concentrically screwed together, and a cap nut 77 is screwed onto the protruding end of the small diameter portion 83. This prevents the valve body 26 from loosening due to vibration or the like.

As mentioned above, according to the present invention, both valve bodies can be adjusted through the opening on the side of the main body, so there is no need to repeatedly attach and detach the relatively heavy bottom cover. In addition to improving work efficiency, it is also safer because the bottom cover does not have to be attached or removed in an unreasonable manner. Furthermore, even those who are not experts in cram school can easily and reliably perform the task of confirming deadlines.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the prior art, FIG. 2 is a system diagram showing a gas supply pipe line in which a governor according to an embodiment of the present invention is used, FIG. The drawings are a sectional view taken along the cutting plane line - in FIG. 3, FIG. 5 is a sectional view showing the drive shaft 24, and FIG. 6 is a sectional view of another embodiment of the present invention. 20... Governor, 23... Main body, 24... Drive shaft, 25, 26... Valve body, 27, 28... Valve hole,
36... Downstream space, 46, 47... Parallel portion,
48... Partition wall, 49... Upstream space, 50, 51
... Valve seat, 52, 54 ... Opening, 53 ... Bottom cover, 55 ... Side cover, 58 ... Upper shaft, 59 ... Connection shaft, 60 ... Lower shaft, 64, 82
...Large diameter part, 65...Inner threaded hole, 78...Nut, 81...Outer thread.

Claims (1)

[Claims for Utility Model Registration] A partition wall that partitions the inside of the main body into an upstream space and a downstream space along the gas flow direction, and has a pair of upper and lower parallel parts that are parallel to each other. A pair of upper and lower valve holes are formed concentrically with facing valve seats, and a drive shaft that passes through these valve holes and is driven in the axial direction has a pair of upper and lower valve bodies that respectively abut on both the valve seats. are fixed to each other, and a side cover is provided on the side of the main body that can be opened and closed to close a first opening facing the upstream space between the two parallel parts, wherein the drive shaft is , an upper shaft, a connecting shaft, and a lower shaft are concentrically connected in this order from top to bottom, and the upper valve body is inserted from the first opening and fixedly clamped by the upper shaft and the connecting shaft. The lower valve body is fixedly provided on the lower shaft and inserted through a second opening formed facing the downstream space of the main body, and the connecting shaft and the lower shaft are arranged such that the distance between the two valve bodies is fixed to the lower shaft. Adjustably connected, the part to be adjusted is located in the upstream space between the two parallel parts and can be adjusted from the first opening, and the second opening can be opened and closed by a bottom cover. A governor characterized by: