JPS636320A - Gas proportional valve - Google Patents

Abstract

PURPOSE:To correct operation of a gas control valve is response to variation in temperature of hot water flowing in a body by a method wherein a pressure differential plate operated under a pressure difference between a primary side pressure and a secondary side pressure is provided, the pressure differential plate is connected to a gas control valve, an opening or closing valve is installed in a bypass passage pipe communicating the primary side with the secondary side and a degree of opening of the opening or closing valve is varied under a thermo-sensitive operation of a thermostat. CONSTITUTION:As a temperature of hot water flowing in a flow passage (a) is varied, an opening or closing valve 8 arranged in a bypass passage 7 may vary a degree of opening under a thermo-sensitive operation of a thermostat TH and then varies an amount of hot water flowing in the passage 7. Since an amount of discharged hot water from the hot water outlet port 11 is kept constant, a variation in amount of hot water flowing in the pipe 7 becomes a variation in amount of hot water flowing in a pipe 31, a pressure differential plate 3 may perform a pressure sensing action, a gas control valve 6 is moved in response to the pressure sensitive action, and an increase or decrease in combustion calorie of the gas is controlled in response to the temperature of hot water while an amount of discharged hot water from the hot water is kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates primarily to improvements in gas proportional valves used in gas instantaneous water heaters.

Gas moment/! ! Since boilers have a small amount of hot water to store, they are difficult to use because the water temperature changes due to changes in output (changes in the amount of hot water supplied), so the input (amount of gas burned) must be controlled in response to changes in output. Gas proportional valves are increasingly being incorporated. Among the gas proportional valves used in this way, the present invention is intended to detect a change in the flow rate of hot water or water as a change in the differential pressure between the primary side and the secondary side using a differential pressure plate (or pressure sensitive plate). This is a mechanical proportional gas valve that controls the amount of gas supplied by the movement of the differential pressure plate.

The prior art regarding this type of mechanical gas proportional valve includes U.S. Pat.
As shown in the figure, a flow path a is provided in the body l so that hot water or water flowing in from the hot water inlet 10 flows out from the hot water outlet 11. By providing a differential pressure plate 3 with a spring 2 facing it so that it operates, and by connecting the differential pressure plate 3 to a gas control valve 6 provided in a gas supply path 5 through a connecting rod 4, the gas control valve 6 can be opened. The temperature of the thermostat changes in proportion to the flow rate of hot water or water flowing through the flow path a, and the fulcrum side of the spring 2 facing the differential pressure plate 3 is provided in the flow path a). Spring seat 4 that moves in the operating direction of differential pressure plate 3 due to TH
1, the differential pressure plate is moved in response to changes in the temperature of the flowing hot water or water, and the opening degree of the gas control valve is corrected in accordance with the temperature of the hot water.

By the way, this prior art has the disadvantage that the differential pressure plate 3 moves in response to both changes in flow rate (amount of hot water supplied) and changes in hot water temperature (or water temperature), making its operation complicated. In addition to being difficult to adjust, there is a problem in that the opening degree of the gas control valve 6 is not controlled smoothly, making it difficult to maintain the temperature of the hot water at a predetermined level.

The present invention has been made to solve this problem, and the fulcrum side of the spring facing the differential pressure plate is fixed to the body, and the movement of the differential pressure plate is limited to only the expansion and contraction of the spring. To provide a new means that, while being simple, allows the operation of a gas control valve connected to the differential pressure plate to be corrected in response to changes in the temperature of hot water (or water) flowing through the body. With the goal.

In the present invention, as a means to achieve this objective, a primary side and a secondary side are installed in the middle of a flow path installed in the body so that hot water or water flowing in from a hot water inlet flows out to a hot water outlet. A differential pressure plate with opposing springs is provided so as to be activated by the differential pressure between A bypass pipe installed in the body so as to communicate between the primary side and the secondary side by straddling the connecting pipe or its differential pressure plate is equipped with an on-off valve whose opening degree can be changed freely, and the on-off valve is The present invention proposes a gas proportional valve in which a thermostat, which is activated by temperature changes of the hot water or water flowing through the flow path, is linked so that the opening degree of the opening/closing valve is varied by its temperature-sensing operation.

Next, embodiments will be described in detail with reference to the drawings. Note that the same reference numerals in the drawings as in the previous means are used for components having the same effect.

FIG. 2 is a vertically sectional front view of a gas proportional valve A in which the present invention can be implemented, and in the figure, 1 indicates a body and 5 indicates a gas supply path.

The body 1 is provided with a hot water inlet 10 on one side of the lower end.
A hot water outlet 11 is provided on one side of the upper end, and a flow path a is provided inside the hot water inlet 10 to allow hot water or water flowing into the hot water inlet 10 to flow through the hot water outlet 1.

Reference numeral 3 denotes a differential pressure plate installed in the middle of this flow path a, with a diaphragm 30 installed to partition the flow path a into a primary side It consists of a pie-boo-shaped conduit 31 provided so as to communicate with the side Y, and a spring 2 that opposes the diaphragm 30 so as to push it down to the primary side (downward). It is provided so as to span between it and a spring seat 20 fixedly installed on the inner surface of the flow path a.

Reference numeral 7 denotes a bypass pipe provided so as to communicate between the primary side and the secondary side Y across the differential pressure plate 3, and is formed on the outer peripheral surface side of the body 1 so as to be integrally continuous with the body 1. The lower end side communicates with the primary side X of the flow path a through a communication lower a, and the upper end side communicates with the secondary side Y of the flow path a through a communication lower b.

Reference numeral 8 denotes an on-off valve provided in the middle of the bypass pipe 7, which faces a valve seat 80 fixedly installed on the pipe wall of the bypass pipe 7 so as to be movable forward and backward, and closed by a tassel spring 81. Extruded to the side.

TH is a thermostat that controls the opening degree of the on-off valve 8, and includes a temperature-sensing section 90 filled with wax, and an operating rod 91 that is pushed out by expansion due to temperature rise of the wax inside the temperature-sensing section 90. This is a conventionally known wax thermoelement consisting of a guide cylinder part 92 that holds the actuating rod 91 in a freely removable manner. The guide cylinder part 92 is fixedly attached to the body 1 and assembled so as to pass through the axial center of the valve 80, and the on-off valve 8 is attached to the tip of the operating rod 91 of the guide cylinder part 92.
The on-off valve is formed between the on-off valve 8 and the valve seat 80 by the movement of the actuating rod 91 in and out due to the temperature change of the hot water or water flowing through the flow path a. The opening degree of 8 can be expanded or contracted.

The gas supply passage 5 is formed in an elbow shape, each having a gas inlet 50 and a gas outlet 51 formed in a connecting pipe, and is joined to the lower surface side of the body 1 and is integrally assembled to the body 1. be. The gas control valve 6 is provided so as to move up and down relative to a valve seat 60 provided at the bottom of the gas supply path 5, and is pushed up and away from the valve seat 60 upwardly by a spring 61. The upper end side of the connecting rod 4 whose lower end is connected to the upper surface side penetrates the ceiling wall of the gas supply path 5 and the bottom wall of the body 1 and enters the primary side X in the body 1, and the differential pressure plate 3 It is connected to the connecting tool 32 assembled on the lower surface side of the , and is connected to the differential pressure plate 3 .

The apparatus of this embodiment operates as follows.

By opening the hot water tap provided in the hot water supply pipe connected to the ink outlet 11 and using hot water, hot water (or water) flows from the hot water inlet 10 and flows through the flow path a in the body 1. Then, the differential pressure plate 3 allows the hot water to flow from the primary side X to the secondary side Y.
The pressure P2 on the secondary side Y falls below the pressure P2 on the primary side X due to the resistance when passing through the differential pressure plate 3.
The force pushing up is S (pressure receiving area of the bottom surface of differential pressure plate 3) x (
Pi-P2), this force moves upward until it balances with the force F of the spring 2 that is pushing down the differential pressure plate 3, thereby connecting it to the differential pressure plate 3 via the connecting rod 4. The gas control valve 6 moves upward to widen its opening and increase the amount of gas burned. That is, the opening degree of the gas control valve 6 is controlled in proportion to the amount of 'lk flowing through the flow path a.

In this state, when the temperature of the hot water flowing through the flow path a changes, the on-off valve 8 provided in the bypass pipe line 7 moves to change its opening degree due to the temperature-sensitive operation of the thermostat TH. The amount of hot water flowing through the bypass pipe 7 is changed. Since the amount of hot water flowing out from the hot water outlet 11 is constant, a change in the amount of hot water flowing through the bypass pipe 7 results in a change in the amount of hot water flowing through the pipe 31 provided on the differential pressure plate 3, and The gas control valve 6 is activated by the pressure sensitive operation of the differential pressure plate 3 due to changes in the amount of hot water.
moves in proportion to this, and the amount of gas combusted is controlled to be increased or decreased according to the temperature of the hot water while keeping the amount of hot water flowing out from the high water outlet 11 constant.

Next, FIG. 3 shows another embodiment. This example is
A pipe 7 in which the middle of the bypass conduit 7 leaves the body 1
An on-off valve 8 and a thermostat TH, which are formed in a diameter of 0.0. , is the same as the embodiment shown in FIG. 2, except that the separate housing 71 is assembled to the hot water supply pipe 1a connected to the hot water outlet 11 (or hot water inlet 10) of the body 1. The same constituent members will be designated by the same reference numerals and detailed explanations will be omitted.

This embodiment operates in the same manner as the embodiment shown in FIG. 2, except that the position of the temperature sensing portion 90 of the thermostat TH is changed.

Next, FIG. 4 shows a further different embodiment. This embodiment is an example in which the bypass pipe 7 in the embodiments shown in FIGS. 2 and 3 is not provided, and the on-off valve 8 is provided in a pipe 31 provided in the differential pressure plate 3.

In this embodiment, a connector 32 provided on the lower surface side of the differential pressure plate 3 for connecting with the gas control valve 6 in the gas supply path 5 accommodates the on-off valve 8 therein, and also connects the on-off valve 8 with the on-off valve 8. It is formed to also serve as a valve housing with a valve seat 80 facing it. In addition, in the thermostan) TH, a temperature sensing part 90 protrudes to the secondary side Y at the upper end side of a conduit 31 assembled to the differential pressure plate 3, and an operating rod 91 passes through the inside of the conduit 31 to the conduit 3.
The assembly is performed as a posture of protruding into the connecting tool 32 connected to the connector 1. The above-mentioned on-off valve 8 is assembled and supported on the lower end side of the operating rod 91. Note that the other configurations are the same as in the above-described embodiments, and detailed explanations will be omitted by assigning the same reference numerals to the same constituent members.

In this embodiment, the pressure difference (Pi-P2) that occurs between the primary side X and the secondary side Y due to the resistance of hot water or water flowing through the pipe 31
The differential pressure plate 3 performs pressure-sensitive operation to control the gas control valve 6 according to the amount of hot water, and when the hot water temperature (or water temperature) changes, the thermostan) TH controls the on-off valve 8. By changing the opening and directly changing the amount of hot water flowing through the pipe 31, the differential pressure plate 3 is moved and the opening of the gas control valve 6 is controlled according to the temperature of the hot water.

Next, FIG. 5 shows another embodiment.

This embodiment has a bypass path W that connects the primary side X and the secondary side Y across the differential pressure plate 3 in the embodiment device of FIG.
and an adjustment screw 2 for adjusting the flow rate in the bypass path W.
In addition to controlling the opening degree of the gas control valve 6 according to the amount of hot water and the opening degree of the gas control valve 6 according to the hot water temperature, the bypass path can be controlled by adjusting the Y4 section screw 2. By adjusting the amount of hot water flowing through W, the hot water temperature can be adjusted as desired. The bypass path W and adjustment screw 2 in this embodiment may be incorporated into the embodiments of FIGS. 2 and 3, and further.

As explained above, the gas proportional valve according to the present invention allows the gas to flow in from the inlet. A differential pressure plate with opposing springs is installed in the middle of the flow path installed in the body so that hot water or water flows out to the outlet, and the differential pressure plate is operated by the differential pressure between the primary side and the secondary side. A body that connects to a gas control valve provided in a gas supply line and connects the primary side and the secondary side provided on the differential pressure plate, or straddles the differential pressure plate to communicate the primary side and the secondary side. An on-off valve whose opening degree can be changed is installed in the bypass pipe installed in the flow path, and a thermostat that is activated by temperature changes of the hot water or water flowing through the flow path is installed in the on-off valve. Since the M is connected so that the opening degree of the on-off valve changes with temperature operation, the opening degree of the gas control valve can be controlled according to the amount of hot water, and the opening degree of the gas control valve can be controlled according to the hot water temperature. However, this can be done by fixing the fulcrum of the spring facing the differential pressure plate, which simplifies the movement of the differential pressure plate and provides a gas proportional valve that is easy to adjust and set.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the prior art, FIG. 2 is a longitudinal sectional front view of an embodiment of the present invention, FIG. 3 is a longitudinal sectional front view of another embodiment, and FIG. 4 is a longitudinal sectional elevation of yet another embodiment. Front view, FIG. 5 is a longitudinal sectional front view of another embodiment. Explanation of drawing symbols A...Gas proportional valve TH...Thermostat a
...Flow path W...Bypass path 2...
Adjustment screw 1...Body 1a...Hot water supply pipe 10...Inlet port 11...Exhaust port
210. Spring 3...Differential pressure plate 30...Diaphragm 31...Pipe-shaped conduit 32...Connector 4...Connecting rod I" 41...Spring seat 5...Gas supply path 5o ...Gas population 51.
...Gas outlet 6...Gas control valve 60...Valve seat 61...Spring 7...Bypass pipe line
7a/7b...Communication lower 0...vibrator
71...Casing 8...Opening/closing valve 8o...
・Valve seat 81... Return spring 9o... Temperature sensing part 9
1... Operation o +7 de 92... Guide cylinder part patent application Artificial Nutcy Industry Co., Ltd. No. 1
Country 2nd FA 31st! ! a 1' 1 b. Fourth circle

Claims (1)

[Claims] A differential pressure plate with opposing springs is installed in the middle of the flow path installed in the body so that the hot water or water flowing in from the hot water inlet flows out to the hot water outlet. , the differential pressure plate is connected to a gas control valve provided in the gas supply path, and the primary side and the secondary side are connected to a conduit provided in the differential pressure plate that connects the primary side and the secondary side, or by straddling the differential pressure plate. An on-off valve whose opening degree can be freely changed is installed in the bypass pipe installed in the body so as to communicate with the body, and the on-off valve is equipped with a thermostat that is activated by temperature changes of the hot water or water flowing through the flow path. A gas proportional valve, which is connected so that the opening degree of the on-off valve is varied by its temperature-sensing operation.