JP3852057B2 - Accelerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an accelerator used in a dry sprinkler fire extinguishing facility or the like.
[0002]
The open valve of the dry sprinkler fire extinguishing equipment has a valve body that opens and closes the communication port between the primary side and the secondary side, and the primary side of this valve body is connected to the main pipe connected to the water source, and the secondary side is Connected to a pipe filled with compressed air.
[0003]
In this fire extinguishing equipment, when the sprinkler head is opened due to the occurrence of a fire or the like, the compressed air on the secondary side is released, and the pressing force on the secondary side of the valve body becomes smaller than the pressing force on the primary side of the valve body. Then, the release valve is opened, and the primary fire extinguishing water flows into the secondary side while pressing the compressed air and is discharged from the sprinkler head.
[0004]
The number of sprinkler heads to be arranged is determined according to the size of the water discharge target area. However, in the case of a wide floor, a large number of sprinkler heads are required, and accordingly, long pipes are required. .
[0005]
However, if the total distance of the pipe is long, the amount of air in the pipe is large, so even if the release of compressed air from the sprinkler head that has been opened due to a fire is started, the pressure in the pipe does not drop rapidly. It takes a considerable amount of time for the pressure on the secondary side to become a valve opening pressure, that is, a low pressure at which the valve element opens.
[0006]
Therefore, since it takes a long time for the valve body to open after the sprinkler head is opened, it takes a long time for the primary fire extinguishing water to be discharged from the sprinkler head, and it is difficult to extinguish the fire in the early stage of the fire. It becomes.
[0007]
Therefore, an accelerator is used to open the release valve quickly. In this accelerator, the primary side inlet is connected to the secondary side of the release valve, and the secondary side outlet is connected to the pressurizing chamber on the primary side of the valve body.
[0008]
The accelerator includes a diaphragm that partitions the body into an air chamber and a fluid chamber, a primary side inlet and a secondary side outlet provided in the fluid chamber, and an inlet provided in the fluid chamber that is separated from the primary side inlet. An outlet communicating with the secondary outlet, a valve that opens and closes the inlet of the flow path, a spring that presses the valve against a valve seat, and a fluid chamber and an air chamber fixed to the valve and the diaphragm; A communication pipe that communicates with each other, and an orifice provided in the pipe.
[0009]
In this accelerator, the air chamber is sealed, and air on the secondary side flows into the air chamber until the secondary side pressure of the open valve reaches, the fluid chamber and the air chamber have the same pressure, and the valve opens the inlet. It is closed.
[0010]
When the pressure in the air chamber decreases due to temperature change or slight leakage due to the season, the air in the air chamber flows into the fluid chamber through the communication pipe by the amount corresponding to the differential pressure.
At this time, a force is exerted to move the valve and the fram in the air flow direction, but since the differential pressure is very small, the force is also small. Therefore, the valve does not open because it cannot overcome the force of the spring.
[0011]
When the sprinkler head opens due to the occurrence of a fire, the pressure on the secondary side of the release valve decreases, and the pressure in the accelerator fluid chamber also decreases abruptly.
Therefore, since the pressure of the air chamber increases, the air in the air chamber tends to flow into the fluid chamber via the communication pipe.
[0012]
However, since the pipe has an orifice, the pipe can be discharged little by little into the fluid chamber. Therefore, since the flam is pushed down, the valve is opened, the air at the primary side inlet is discharged from the secondary side outlet through the flow passage, the pressurizing chamber of the open valve is pressurized, and the valve body is The compressed air in the pipe is opened before it drops to the valve opening pressure, and the primary fire extinguishing water is quickly supplied to the secondary pipe.
[0013]
[Problems to be solved by the invention]
Conventional accelerators have the following problems.
[0014]
(1) The orifice provided in the communication pipe may be clogged with dust and may not operate normally.
[0015]
(2) Since the low-viscosity air passes through the orifice, the accelerator will not operate normally unless the aperture is accurately formed as designed.
[0016]
(3) However, since the diameter of this orifice is small, its production management is extremely difficult.
[0017]
(4) Air is sealed in the pressure chamber as the drive source. In the case of air, if the difference between the pressure at the time of fire monitoring and the operating pressure is large, for example, the pressure at the time of fire monitoring is 10 kg / cm ² and 2 kg / Assuming that the accelerator is designed to operate when it reaches cm ² , the volume of the air chamber needs to be 5 when the accelerator is activated, and the volume of the body is increased when monitoring the fire.
[0018]
This is because in the case of air, the pressure of the air chamber and the volume of the air chamber are inversely proportional.
[0019]
In view of the above circumstances, an object of the present invention is to enable an orifice to always maintain a normal state.
[0020]
Another object is to make the accelerator smaller and easier to manufacture.
[0021]
[Means for Solving the Problems]
The present invention is a liquid chamber that is filled with a liquid and divides the inside of a body into a pressing chamber and a fluid chamber, and includes a liquid chamber provided with a cylinder portion sealed at both ends by a diaphragm, and is inserted into the cylinder portion A piston portion that partitions the liquid chamber into a first chamber and a second chamber; an orifice provided in the piston portion that communicates the chambers; and a pressing chamber that presses the liquid chamber. A pressurizing means; an inlet of the fluid chamber , which communicates with a primary side of a valve described later; an outlet of the fluid chamber, which communicates with a secondary side of the valve ; A flow passage provided in the fluid chamber, having an inlet spaced apart from the primary side inlet and having an outlet communicating with the secondary side outlet, and a valve connected to the piston portion for opening and closing the inlet of the flow passage. Accelerator provided.
[0022]
The present invention provides a liquid chamber that is filled with a liquid and divides the inside of a body into a fluid chamber and a press chamber that communicates with the atmosphere, the cylinder having a cylinder portion sealed at both ends by a diaphragm, and the cylinder A piston part that is inserted into the part and divides the liquid chamber into a first chamber and a second chamber, an orifice provided in the piston part that allows the two chambers to communicate with each other, and provided in the pressing chamber. A spring that presses the chamber; an inlet of the fluid chamber that communicates with a primary side of a valve described later; and a secondary side that is an outlet of the fluid chamber and communicates with a secondary side of the valve described later. An outlet, a valve provided in the fluid chamber, the inlet being separated from the primary side inlet, the outlet being in communication with the secondary side outlet, and a valve connected to the piston portion to open and close the inlet of the flow path And an accelerator, A.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
The accelerator body is partitioned into a press chamber and a fluid chamber by a liquid chamber filled with a slow liquid such as silicon oil. The liquid chamber includes a cylinder part, a diaphragm that closes both ends of the cylinder part, and a piston part that is slidably fitted to the cylinder part. The piston portion is formed with an orifice that allows the first chamber and the second chamber to communicate with each other.
[0024]
The pressing chamber is provided with pressing means for pressing the liquid chamber, and for example, a spring is used as the pressing means. When this spring is used, the pressing chamber is open to the atmosphere.
[0025]
The fluid chamber is provided with a primary side inlet and a secondary side outlet, a flow path is provided at a position spaced from the primary side inlet, a valve is provided at the inlet of the flow path, and the outlet is connected to the secondary side. It is connected to the side exit. This valve is connected to the piston portion in the liquid chamber via a connecting rod. This valve is biased in the valve closing direction by a spring.
[0026]
When the pressure in the fluid chamber decreases, the liquid flows from the first chamber to the second chamber through the orifice. However, since the amount of the inflow is small, the liquid cannot be moved by an amount corresponding to a sudden pressure change. As a result, the piston part moves down, so that the valve moves against the spring force of the spring and opens.
[0027]
【Example】
An embodiment of the present invention will be described with reference to FIGS.
The primary side 2 of the release valve 1 is connected to a water source 5 via a main pipe 3 and a pump 4, and the secondary side 6 is connected to a pipe 8 provided with a sprinkler head 7. The sprinkler head 7 is a closed sprinkler head, and the inside of the pipe 8 is filled with compressed air.
[0028]
As shown in FIGS. 1 and 2, the release valve 1 includes a valve body 15 that opens and closes the communication port 11 between the primary side 2 and the secondary side 6 of the main body 10. The valve body 15 is a disc having a diameter D ₁₀ = 150 mm and is seated on the valve seat 16. The water pressure receiving surface 2 a on the primary side 2 and the air pressure receiving surface 6 a on the secondary side 6 have a diameter D ₁₀ = 150 mm. It is formed in a circular shape.
The valve body 15 is provided with a seal member 15 a made of rubber or the like at a portion in contact with the valve seat 16.
[0029]
A pressure chamber 18 facing the communication port 11 is provided on the primary side 2 of the main body 10. The pressurizing chamber 18 includes a cylinder part 19 and a piston part 20 slidably inserted in the cylinder part 19, and the piston part 20 opens the valve body 15 generated by the primary side pressure. It plays the role of a balancer BL that counteracts most of the power to be tried.
[0030]
The piston portion 20 is, for example, a disk having a diameter D ₂₀ = 130 mm, and forces in opposite directions, that is, the pressure of the fire extinguishing water W on the primary side 2 and the air in the pressurizing chamber 18 facing this pressure. Receive the pressure of K.
[0031]
The piston portion 20 and the valve body 15 are fixed to the guide rod 21 so as to face each other on the primary side. The rod 21 is orthogonal to the axis C of the main body 10 and is slidably supported by the guide support portion 22. The rod 21 slides and guides the valve body 15 in the direction of arrow A15, and the diameter and length thereof are appropriately selected as necessary.
[0032]
The secondary side 6 of the release valve 1 is connected to the primary side inlet 60 of the accelerator 30 through the drawing pipe 31. As shown in FIGS. 4 to 6, in the accelerator 30, the body 41 is partitioned into a pressing chamber 43 and a fluid chamber 45 by a liquid chamber 40.
[0033]
The liquid chamber 40 is inserted into the cylinder portion 46, the first diaphragm 47 and the second diaphragm 48 that seal both end faces of the cylinder portion 46, and the cylinder portion 46, and the liquid chamber 40 is inserted into the first chamber 40a. And a piston part 49 for partitioning into a second chamber 40b. The first chamber is located on the pressing chamber 43 side, and the second chamber is located on the fluid chamber 45 side.
[0034]
The piston portion 49 is formed in a disc shape, and a connecting rod 50 is provided upright at the center thereof. The piston portion 49 is formed with an orifice 51 that allows the first chamber 40a and the second chamber 40b to communicate with each other. The size and shape of the orifice 51 are appropriately determined as necessary. .
The liquid chamber 40 is filled with a slow fluid, for example, silicon oil SO. The slow fluid may be any fluid that has a greater viscosity than air, and is not necessarily limited to silicone oil.
[0035]
A driving spring 55 is provided in the pressing chamber 43, and this spring 55 is stretched between the diaphragm 47 and the upper inner wall 41 a of the body 41.
This spring 55 presses the diaphragm 47 to the diaphragm 48 side.
[0036]
Since the pressing chamber 43 communicates with the atmosphere via the atmosphere communication port 56, the inside of the pressing chamber 43 is always at atmospheric pressure.
[0037]
The fluid chamber 45 is provided with a primary inlet 60 connected to the extraction pipe 31 and a secondary outlet 61 connected to the secondary pipe 32. The outlet 61 is connected to a flow passage 63 provided in the fluid chamber 45. A valve seat 65 is provided at the inlet 64 of the flow passage 63, and a valve 70 is in pressure contact with the valve seat 65. A pressing force in the valve closing direction is applied to the valve 70 by a spring 71.
[0038]
The central portion of the valve 70 and the central portion of the piston portion 49 are connected via a connecting rod 50 that passes through the flow passage 63 and the diaphragm 48. Sealing means is provided in the flow passage 63 and the through portion S of the diaphragm 48.
[0039]
The secondary side outlet 61 of the accelerator 30 is connected to the secondary side pipe 32, and the pipe 32 is branched into an air release pipe 33, a pressure pipe 34, and a pressure pipe 35.
[0040]
The atmosphere release pipe 33 is provided with an orifice 36, and the pressure pipe 34 is connected to a pressure switch 37. The pressurizing pipe 35 is connected to the pressurizing chamber 18 of the release valve 1, and the inside of the pressurizing chamber 18 is normally maintained at atmospheric pressure by air entering from the orifice 36.
[0041]
Next, the operation of this embodiment will be described. First, fire monitoring will be described.
Pneumatic P ₁₁ water pressure of the primary side of the release valve 1 P ₁₀ and its secondary side 6 is kept at a respectively predetermined pressure. The water pressure P ₁₀ and the operating pressure of the pneumatic P ₁₁ ratio P _10: P ₁₁ is usually 5: 1, for example, water pressure P ₁₀ = 14kgf / cm ^2, is a pneumatic P ₁₁ = 2.8kgf / cm ² In order to prevent a valve opening accident due to impact or the like, a value exceeding the open / close critical value 2.8 kgf / cm ² , for example, air pressure P ₁₁ = 3.8 kgf / cm ² is set.
[0042]
Water pressure receiving surface 2a and an air pressure-receiving surface 6a is the same area of the valve body 15, i.e., is a Paiesu _10, it is _{S 10 = (D 10/2} ) 2.
This water pressure receiving surface 2a takes pressure P _10, also the air pressure P ₁₁ is applied to an air pressure-receiving surface 6a. Therefore, a pressure of πS ₁₀ × P ₁₀ is applied to the water pressure receiving surface 2a of the valve body 15 as a whole, and a pressure of πS ₁₀ × P ₁₁ is applied to the air pressure receiving surface 6a as a whole, and πS ₁₀ × P ₁₀ > πS ₁₀ P ₁₁ .
[0043]
At this time, the piston 20 connected to the valve body 15 is subjected to water pressure in the opposite direction to the hydraulic force applied to the water pressure receiving surface. The water pressure applied to the piston part 20, that is, the balance pressure B is the area πS ₂₀ × water pressure P ₁₀ of the piston part 20,
Here, S ₂₀ = (D _20/2 ) ² . The balance pressure B is canceled and the water pressure applied to the water pressure receiving surface 2a of the valve body 15 is reduced. That is, the pressure actually applied to the water pressure receiving surface 2a of the valve body 15 is
πP ₁₀ (S ₁₀ -S ₂₀ )
It becomes.
Therefore, in order to keep the valve body 15 closed, the pressure of the air pressure receiving surface 6 of the valve body 15 is
It should be larger than πP ₁₀ (S ₁₀ −S ₂₀ ).
[0044]
More specifically, the valve closing condition is πP ₁₀ (S ₁₀ −S ₂₀ ) ≦ πS ₁₀ P _11.
When this condition breaks, the valve opens. Since the working pressure ratio between the water pressure P ₁₀ and the air pressure P ₁₁ is 5: 1,
5P ₁₁ × (S ₁₀ −S ₂₀ ) ≦ P ₁₁ × S ₁₀
4/5 × S ₁₀ ≦ S ₂₀
It becomes. Therefore, if the diameter D ₂₀ of the piston portion 20 to 4/5 or more the diameter D ₁₀ of the valve element 15, also without increasing as in the conventional example the valve body 15 satisfies the closed condition Can do. Since the valve body 15 does not open even if the diameter D ₁₀ of the valve body 15 is too large with respect to the diameter D ₂₀ of the piston section 20, the diameter D ₂₀ of the piston section 20 is set to 9/9 of the diameter D ₁₀ of the valve body 15. It is also necessary to make it 10 or less.
[0045]
Thus, the force that tries to open the valve element 15 generated by the primary pressure P ₁₀ is largely offset by the balancer BL, also the secondary side in the area of the conventional valve body 15 in the low pressure air is closed It becomes possible.
[0046]
The fluid chamber 45 on the primary side 42 of the accelerator 30 is filled with compressed air K on the secondary side 6 of the release valve 1, and the compressed air K pushes up the diaphragm 48 of the liquid chamber 40 toward the diaphragm 47. Then, the silicon oil SO moves through the orifice 51 from the second chamber 40b of the piston portion 49 to the first chamber 40a, and also moves the piston portion 49, compresses the spring 55, and the oil SO is recovered. The spring 55 is compressed until it becomes the same pressure as that of the secondary air, that is, the compressed air K.
[0047]
The valve 70 is closed under the valve closing pressure due to the spring force of the spring 71 and the pressure of the compressed air K.
[0048]
In this accelerator 30, when the pressure in the fluid chamber 45 decreases due to seasonal temperature changes or slight gas leaks, the spring 55 tends to extend by the reduced pressure, so the silicon oil in the first chamber 40 a , Flows through the orifice 51 of the piston portion 49 and flows into the second chamber 40b.
At this time, a force in the valve opening direction acts on the piston portion 49 and the valve 70, but the inflow into the second chamber 40b is slow and small in amount, and the force is small, so that the valve closing pressure can be overcome. Can not. Therefore, the valve 70 maintains a closed state.
[0049]
The secondary side 44 of the accelerator 30 communicates with the pressurizing chamber 18 through the pipes 32 and 35. The pressurizing chamber 18 is maintained at atmospheric pressure via the orifice 36.
[0050]
Next, the time of fire will be described. When the sprinkler head 7A is opened due to the occurrence of a fire, the compressed air on the secondary side 6 of the release valve 1 is released from the sprinkler head 7A, and the pressure of the compressed air on the secondary side 6 changes due to temperature changes and minute changes due to the seasons. Compared to the case of gas leakage, it decreases rapidly.
[0051]
At this time, the pressure in the fluid chamber 45 of the accelerator 30 also drops rapidly, and the spring 55 extends as shown in FIG. 6, so that the silicon oil SO passes through the orifice 51 from the first chamber 40a to the second chamber. Move to 40b.
[0052]
However, since the silicon oil SO is viscous and cannot pass through the orifice 51 quickly, the moving speed of the oil SO becomes slower than the speed at which the spring 55 extends and cannot catch up. Therefore, the valve 70 overcomes the valve closing pressure and is pushed down to open, so that the compressed air K on the primary side flows to the secondary side 44 through the inlet 64 and passes through the pressure pipe 35 to the pressure chamber 18. The piston part 20 is pressed into the valve body 15 side. The secondary side pipe 32 communicates with the atmosphere opening pipe 33 through the orifice 36, and the compressed air K flowing from the outlet 61 through the orifice 36 has a small amount of escape to the atmosphere opening pipe 33, and most of it is a pressurized pipe. 35 and the pressure pipe 34. For this reason, the compressed air K can press the piston part 20 as described above. The compressed air K that has flowed into the pressure pipe 34 operates a pressure switch 37. The pressure switch 37 is connected to an alarm device (not shown), the pump 4 and the like via a control panel (not shown). Sends a signal that the valve has opened and water has flown, and issues an alarm or drives the pump.
[0053]
Therefore, the release valve 1 is forcibly opened in a state where the pressure on the secondary side does not drop to the valve opening pressure, so that the fire extinguishing water W on the primary side 2 is supplied to the secondary side 6 at the initial stage of the fire. The sprinkler head 7A can be supplied.
[0054]
The valve body 15 of the release valve 1 is guided by the guide rod 21 at the time of opening and closing and slides in the direction orthogonal to the axis C, so that the contact position between the valve seat 16 and the seal member 15a of the valve body 15 is always the same. Become. Therefore, even if a seal mark is attached to the seal member 15a, the seal mark and the valve seat 16 always come into contact with each other, so that no seal leakage occurs.
[0055]
When the release valve 1 is opened, the valve body 15 is designed to slide by 1/3 of the diameter D ₁₀ of the valve body 15. This is because, if the valve body 15 slides by ¼ of the diameter D ₁₀ , the same channel cross-sectional area as that of the communication port 11 having the diameter D ₁₀ can be secured, and the channel resistance is reduced. .
[0056]
The cross-sectional area of the primary side inlet 1A of the release valve 1 is designed to be the same as the area of the water pressure receiving surface of the valve body 15. Moreover, the flowing water amount is set to, for example, 2800 L / min on both the primary side 2 and the secondary side 6.
[0057]
In the accelerator 30, since the piston portion 49 is disposed in the liquid chamber 40, the orifice 51 provided in the piston portion 49 is blocked from the outside.
Therefore, the orifice 51 is not clogged by the inflow of dust or the like.
[0058]
Further, since the fluid passing through the orifice 51 is silicon oil SO having a high viscosity, it can play the role even if the orifice has a slightly larger diameter. Therefore, the production management of the orifice diameter is easier than in the case where the fluid is air.
[0059]
In this accelerator 30, a spring is used as a driving source for pressing the diaphragm 47. Therefore, if the position where the spring is contracted to the minimum or the characteristic of the spring itself is set, the accelerator 30 becomes small.
[0060]
However, when air is sealed in the pressure chamber and air is used as the drive source, if the difference between the pressure at the time of fire monitoring and the operating pressure is large, for example, the pressure at the time of fire monitoring is 10 kg / cm ² and 2 kg / cm Assuming that the accelerator is designed to operate when it becomes ² , the volume of the air chamber needs to be 5 when the accelerator is activated, and the volume of the body is increased when monitoring the fire.
This is because in the case of air, the pressure of the air chamber and the volume of the air chamber are inversely proportional.
[0061]
On the other hand, in the case of a spring, because the linearity of the spring, the position where the spring contracts to the minimum can be set to 0, and any size can be designed by selecting the spring constant. It becomes possible.
[0062]
【Example】
Another embodiment of the present invention will be described with reference to FIG. In the release valve 1, the piston portion 20a and the valve body 15a are fixed to the guide rod 21a, and the guide rod 21a passes through the piston portion 20a and the valve body 15a.
Further, the guide rod 21a is slidably supported by guide support portions 22a and 22b provided on the primary side and the secondary side, respectively.
[0063]
Hereinafter, description will be made assuming that the end portions of the guide rods on the primary side and the secondary side are 100a and 100b, respectively. Further, the contact portion 101a is provided on the secondary side surface of the valve body 15a, and when the release valve 1 is opened, the contact portion 101a contacts the end of the guide support portion 22b in the primary side direction, One end 100a of the piston portion 20a is configured to stop at the end of the guide rod 21a in the secondary direction.
[0064]
Therefore, even when the accelerator 30 does not operate due to a failure, compressed air does not flow into the secondary pipe 32, and compressed air K does not reach the pressure switch 37, water flows from the pressurizing chamber 18a. Then, the pressure switch 37 can be operated via the pressure pipe 35 and the pressure pipe 34.
[0065]
When water discharge from the sprinkler head 7 is no longer necessary due to suppression of fire, etc., after stopping the pump 4, a force is applied to one end 100b of the guide rod 21a from the outside by a drive device or the like, thereby allowing the valve body 15a, piston portion 20a can be returned to its original position and the release valve 1 can be closed.
[0066]
【Example】
Still another embodiment of the present invention will be described.
In the above embodiment, the guide support portion 22 is used as the sliding guide means for slidably supporting the guide rod 21. However, the sliding guide means is not limited to this, and the guide rod 21 is not limited thereto. May be provided inside the main body 10 so as to be slidably guided in the direction of the arrow A15, and the piston part 20 may be replaced with a sliding guide means. A plurality of, for example, two, may be provided, and the guide rod 21 may be slidably supported by these piston portions.
[0067]
By adopting such a configuration, it is not necessary to adopt a watertight structure like the guide support portion 22 of each of the above embodiments, and the risk of water leakage due to cost reduction of the manufacturing surface and deterioration of the watertight structure is also eliminated.
[0068]
Further, in each of the above embodiments, the pressure pipe 34 is connected to the pressure switch 37, and the flowing water detection means is constituted by the guide rod 22 and the pressure switch 37. However, the flowing water detection means is not limited to this. Protrusions are provided in the portion of the guide rod 22 located on the outer side, and the release valve 1 is opened, and the guide rod 21 is slid so that the projection abuts against the microswitch. You may make it comprise a flowing water detection means by a protrusion and a microswitch.
[0069]
【The invention's effect】
Since the present invention is configured as described above, the following remarkable effects can be obtained.
(1) Since the piston portion is provided in the liquid chamber, and an orifice for communicating the first chamber and the second chamber is provided in the piston portion, the orifice is blocked from the outside.
Therefore, unlike the conventional example, dust or the like is not clogged in the orifice.
[0070]
(2) Since the liquid chamber is filled with a slow liquid such as silicon oil, a large fluid resistance is generated when the liquid passes through the orifice. For this reason, manufacturing management is easy because there is no problem even if the orifice diameter is not precisely formed. (3) Since a spring is used as the drive source, the apparatus can be downsized as compared with the case where air is used as the drive source.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing an embodiment of an opening valve of the present invention.
FIG. 2 is a longitudinal sectional view showing a valve open state of FIG. 1;
FIG. 3 is a flowchart of a dry sprinkler fire extinguisher.
FIG. 4 is a longitudinal sectional view showing an accelerator according to the present invention.
FIG. 5 is a longitudinal sectional view showing another state of FIG.
6 is a longitudinal sectional view showing a valve open state of FIG. 4;
FIG. 7 is a longitudinal sectional view showing another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Opening valve 2 Primary side 3 Main pipe 6 Secondary side 8 Piping 10 Main body 11 Communication port 15 Valve body 16 Valve seat 18 Pressurizing chamber 19 Cylinder part 20 Piston part 30 Accelerator 40 Liquid chamber 41 Body 43 Pressing chamber 45 Fluid chamber 46 Cylinder part 47 Diaphragm 48 Diaphragm 49 Piston part 51 Orifice 55 Drive spring 56 Atmospheric communication port 60 Primary side inlet 61 Secondary side outlet 63 Flow path 64 Inlet 65 Valve seat 70 Valve

Claims (3)

A liquid chamber that is filled with liquid and divides the inside of the body into a press chamber and a fluid chamber, and includes a cylinder portion sealed at both end faces by a diaphragm;
A piston portion that is inserted into the cylinder portion and partitions the liquid chamber into a first chamber and a second chamber;
An orifice that is provided in the piston and communicates the two chambers;
A pressurizing means provided in the pressing chamber and pressing the liquid chamber;
A primary side inlet that is an inlet of the fluid chamber and communicates with a primary side of a valve described later ;
A secondary side outlet which is an outlet of the fluid chamber and communicates with a secondary side of the valve described later ;
A flow passage provided in the fluid chamber, the inlet being spaced apart from the primary inlet, and the outlet communicating with the secondary outlet;
A valve connected to the piston portion for opening and closing the inlet of the flow passage;
Accelerator with A liquid chamber that is filled with liquid and divides the inside of the body into a fluid chamber and a press chamber that communicates with the atmosphere, and a liquid chamber having a cylinder portion sealed at both end faces by a diaphragm;
A piston portion that is inserted into the cylinder portion and partitions the liquid chamber into a first chamber and a second chamber;
An orifice that is provided in the piston and communicates the two chambers;
A spring provided in the pressing chamber and pressing the liquid chamber;
A primary side inlet that is an inlet of the fluid chamber and communicates with a primary side of a valve described later ;
A secondary side outlet which is an outlet of the fluid chamber and communicates with a secondary side of the valve described later ;
A flow passage provided in the fluid chamber, the inlet being spaced from the primary inlet, and the outlet communicating with the secondary outlet;
A valve connected to the piston portion for opening and closing the inlet of the flow passage;
Accelerator with The accelerator according to claim 1 or 2, wherein the valve is urged in a valve closing direction by a spring means.

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