JPS59170626A - Percolation type hot-water boiler - Google Patents

Abstract

PURPOSE:To facilitate the manufacture of the titled boiler and to reduce water cutting sounds by a method wherein a bypass body having a hole of large diameter and a throttle pipe having small inner diameter are provided in a hot water bypass pipe connecting a forward heating pipe and a backward heating pipe in that order and a ball valve is arranged midway in the bypass body. CONSTITUTION:A throttle pipe 12 is arranged in the bypass pipe 11 which connects a forward heating passage 5 and a backward heating passage 7 and a bypass valve 10 is formed of the bypass body 10a and the ball valve 10b of a diameter smaller than that of the bypass body 10a. The inner diameter of the throttle pipe 12 is made smaller than that of the hole in the bypass body 10a and is so determined that hot water in a quantity larger than a predetermined value is allowed to flow through the pipe 12 lest the hot water should boil in an instantaneous heat exchanger 1. Thus, by the provision of the throttle pipe 12 in the bypass pipe 11, it is not necessary to correct any displacement of the center of the hole of the bypass body 10a from the center of the hole in the ball valve 10b so that the boiler is manufactured easily and the cavitation at the downstream side of the bypass body 10a is prevented to thereby reduce noises.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a direct current type hot water boiler, and particularly to a bypass pipe bypass valve mechanism that short-circuits a heating outgoing pipe and a heating return pipe.

[Background of the invention]

The same type I-flow hot water boiler performs a prescribed heat exchange by circulating water passing through a heat exchanger, and when heated hot water is used for heating 1, it only radiates heat when it passes through a radiator. Therefore, the hot water has a relatively high temperature.

For example, compared to when heated water is used exclusively for hot water supply,
The temperature is about 0 to 50"C. Therefore, if the flow rate of hot water flowing into the heat exchanger for heating is reduced below a certain amount, the hot water temperature +u may rise and boil.

When a constant flow rate always flows through the heat exchanger, a bypass pipe is provided to short-circuit the heating outgoing pipe to the external equipment and the heating return pipe from the external equipment. In this way, even if the flow rate to the external equipment is at its minimum, the boiler can continue to operate without the boiler rising. The above-mentioned bypass pipe generally uses a copper pipe with a protective wall, but this copper pipe gradually wears out due to the friction of the water flow, and is subject to so-called corrosion. ,,: In the declaration? , ・The flow velocity in the pipe is 05~]
, 5 - y = A'ru no □ is customary. □Reducing the inner diameter of the steel pipe to add resistance, 1. I don't like that.

On the other hand, there is a trend to increase the head of hot water pumps as much as possible in response to recent market demands, but in order to adjust the flow rate of the bypass passage within a certain range, it is necessary to take into account the head of the hot water pump, the pump head, and the L part. Local restriction of the bypass passage is required. In other words, in order to make the lifting height cylindrical, the local aperture diameter is made small, so the aperture diameter is reduced.

The flow velocity in the part becomes faster. As a result, cavitation occurs on the downstream side of the throttle part, causing a problem in which the noise before draining is transmitted to the outside; however, an on-off valve is provided in the bypass passage. Generally, this bypass on-off valve needs a function that can be fully opened to facilitate air removal and water filling of external piping during boiler installation. If it can be fully opened in this way, the head of the hot water pump 2 will be reduced by 3.
The bypass valve must be manufactured so that no deviation occurs in the flow path between the il (L', full valve is used) D"f and the valve body. □Therefore, the bypass valve This had the disadvantage that the production required one-time preparation and adjustment work.

In addition, in order to suppress the above-mentioned occurrence before water draining, the bypass flow path generally disperses local resistance and adjusts the resistance by lengthening the piping. Therefore, the disadvantage is that the bypass piping becomes long and the structure becomes complicated and expensive.
It was.

[Objective of the Invention] The present invention solves the drawbacks of the above-mentioned conventional techniques and achieves a simple form:
It is an object of the present invention to provide a once-through type wet water boiler having a bypass flow path that is easy to install and manufacture, and has a bypass flow path that is less likely to occur before draining.

[Summary of the invention]

The feature of the present invention is that a pass body with a large inner diameter hole and a perforated pipe with a smaller inner diameter are installed in the order of hot water flow direction of the bypass pipe. A secondary valve having a hole smaller than the inner diameter hole is installed in the middle part of the inner diameter hole. '1 [Embodiment of the Invention] Fig. 1 is an embodiment of the present invention: it is a system diagram of a stream □ type Toyonaga boiler. The hot water flowing inside the heat exchanger I is sent to the hot water pump 2 through No. 4, which passes through the heat exchanger I layer, through the 6 expansions, and into the hot water pump 2: 1: 1 heating passage. □６
The heating return pipe passes through the heat ÷ - □ 1 x 1 x 11
1 Akira N Tarekui 1 Yofnia → Mu 8 Seshiki: Kiri 雛 i soori, this is the place where you can collect 11 techniques of 1 carving harisui in this system. '*'f:j Expansion - The main part 1 of tank 4 was released in this restem--I'm surprised that the air vent valve 9 that releases □ into the atmosphere has been discontinued. ``''''1'W'' ``Bojipu 2nd discharge example 11 pie public 1 pull'' *11
A bypass valve '10 is provided in the middle of the seven-way pipe 11 which branches off and communicates with the two-way pipe 7. Speech valve 13' works in conjunction with the installed 1t radiator 6. In other words, heat radiation *
The electric valve 13 is closed when the radiator 6 is at rest, and is open when the radiator 6 is in operation.At this time, the hot water sent from the hot water pump 2 is sent to the heating inlet 5, the radiator 6, and the radiator 6. Heating return pipe 7 circulates through heat exchanger 1, hot water pipe 3 and expansion tank 4: □ Also,
When the radiator 6 is at rest and the electric valve 13 is closed, the air circulates through the bypass pipe 11 in a short circuit. °１ ″″
: : ・1' meeting: This is an enlarged cross-sectional view of the bypass passage in one direction from FIG. 1. The same parts as in FIG. 1 are given the same reference numerals. A restrictor 1 is installed in the bypass pipe 11 connecting between the heating return path and the heating return path, and the bypass valve 10 adjacent to it is connected to the bypass pipe
It is composed of a1 ball valve 10b, and is sharpened by two pairs of O-rings 10C. Bypass pipe - Inner diameter: 1 in the middle of the mouth - Throttle pipe 1
2 is installed, and the flow 1 below the throttle pipe 12 is stopped at the bent part of the □ bar pass pipe 11.

The hole diameter 1 of this throttle tube 12 is supplied in the instantaneous heat exchanger 1.
It is determined by the ship 2 that there is a certain amount of hot water that can be distributed (*r'+) so that it does not occur.
This takes into account the lift of the drought pump. That is,
The electric valve 13 becomes "open" and 1: 1I3j is the heat exchanger 1
Since the hot water flow 11 at 1114°1fv shows a minimum amount of 1, in this case, the flow 1d through the throttle tube 12TPj10 is L.
The most in the heat exchange agony 1 (Mr.
(The inner diameter is determined so that f can be maintained.

FIG. 3 is a diagram showing the relationship between the Wa water flow t11 in FIG. 1 and the head of the hot water pump. The essential flow of the 7r FJ in the piping in the exchanger 1 is keQ, and the culm of the IIq hot water pump 2 that flows this flow rate 01 is culm keH1.
, MaT2, flow rate Q.

The arrangement inside the heat exchanger 1 excluding the bypass flow path when flowing;
Assuming 1゛V resistance and I2, (H,) (2) is the piping space required for the bypass flow path. The solid line is the head curve of the hot water pump 2, and the dashed line is the bypass line,
The piping resistance curve inside the heat exchanger 1 except for the road, and the two-dot chain line is the piping resistance line inside the heat exchanger 1 when the valve 13 is closed.

General Nibibus '11J H'e krel i! nl 7
1<7Mr'& C Heat exchanger ff% is set approximately equal to the minimum required flow rate of the piping inside the device 1.

The reason for this is to reduce the head loss of the hot water pump 2.

11] Throttle tube 12 determined as explained in Fig. 2
The hole diameter of the bypass body 10a is made larger than the inner diameter of the bypass body 10a, and a pole valve 10b is installed in the middle part of the bypass body 10a.
Y has been given. bT: Therefore, the hot water pump 2 is turned to 0, and T = the hot water is all pressed on the flow side of the throttle pipe 12 with the largest resistance to 0, and the reverse flow is 1 pressure 1/-1:, 3, If this backflow rE is P3 and the pressure of the stagnation part of the water flow that is not subject to this backflow pressure is P2, then the following Bernoulli equation 11 (holds).

Since the specific gravity γ of water can be regarded as 1, formula (1) %
Formula % (2) Here, Pl is the pressure inside the bypass body 10a on the flow side of the ball valve 10b, and Vl indicates the continuous speed at that point. is the pressure inside the pole valve 10b, and 2 indicates the flow at that point. Also, y
is the acceleration of the vehicle force.

The part of the water stagnation part in the bypass valve 10 that generates the lowest pressure is immediately after the Pall valve lOb, and the flow velocity in this part is approximately the same as the flow velocity in the Pall valve 10b. Similarly, according to Bernoulli's theorem, the pressure in the water stagnation portion is equal to the pressure P2 in the hole valve 10b.

Now, if the vapor pressure of water is iPw, when P2 < Pw, cavitation will occur in the stagnation area of water,
The true pressure P of this stagnation part is P-P2+P3. That is, the effect of suppressing the occurrence of cavitation by the amount of backflow pressure P can be obtained. Further, from the above relationship, by providing the pole valve 10b having a hole diameter smaller than that of the bypass body 10a, the center of the hole of the bypass body 0a and the pole valve 10b can be
There is no problem even if the center of the valve 10 is slightly shifted from the center of the valve 10, so that there is an advantage that the bypass valve 10 can be manufactured at a low cost and that the machining of the pole valve 10b becomes easy.

Similarly, on the downstream side of the bypass pipe 12, the above-mentioned Berne-8-I formula: i @ 171 is applied, and hot water at a flow rate of V3 collides with the bent part of the bypass pipe 11, creating backflow pressure and causing cavitation. becomes defense 1. Therefore, the restrictor tube 1
By changing the hole diameter of 2, the resistance T of the bypass flow path can be
This has the advantage that the bypass pipe 11 can be easily and inexpensively constructed without making the bypass pipe 11 unnecessarily long.

In the single-stream drought boiler (in this example), if a pole valve with a hole diameter smaller than the hole diameter of the bypass body is provided, a bypass pipe f/with a hole diameter larger than the hole diameter of the pole valve is connected to the river, and this bypass Since a fitting pipe with a Δ hole diameter smaller than the hole diameter of the bypass body is provided inside the pipe, there is no need to make an 11'J misalignment between the center of the hole in the bypass body and the center of the hole in the pole valve. The valve can be made inexpensively, and the hole diameter of the pole valve can be easily made small. In addition, noise can be prevented by suppressing cavitation on the downstream side of the bypass valve.
− This gives rise to the advantage of Historically, since the flow side end face of the throttle tube is connected at the bend of the bypass tube, it is easy to determine the position of the throttle tube, and the bypass body
Therefore, the bypass pipe can be shortened and simple, and other effects can be obtained.

〔Effect of the invention〕

The Ifrfi type hot water boiler of the present invention has advantages such as having a simple bypass flow path, making it easy to learn, and producing no noise.

[Brief explanation of drawings]

Figure 1 shows an example of this redundant system (system diagram of a flow-type hot water boiler; Figure 2 is an enlarged sectional view of the bypass flow path in Figure 1;
FIG. 3 is a diagram showing the relationship between the hot water flow ji shown in FIG. 1 and the head of the hot water pump. .

Claims (1)

[Scope of Claims] 1. A heat exchanger, a hot water pump that pumps heated water flowing through piping in the heat exchanger to a heating outgoing pipe, -1
- a radiator connected to the 111L end of the heating outgoing pipe via a valve; a heating return pipe connecting the other end of the radiator to piping in the heating device; and the heating return pipe. and a bypass pipe that communicates with the heating outgoing pipe immediately after the hot water pump. A direct current type characterized in that a throttle pipe having an inner diameter hole is installed in i', and a pole valve having a hole smaller than the inner diameter hole is installed in the middle part of the bypass body. Hot water boiler. 2. The once-through hot water boiler according to claim 1, wherein the bypass pipe is a pipe line having a bent portion that fixes the downstream end of the throttle pipe.