JPH01281362A - Mechanism for hot water supply - Google Patents

Abstract

PURPOSE:To secure safety for a mechanism of hot water supply by connecting on the downstream side of a check valve in a supply hot water channel a volume expansion device which is actuated by a set pressure lower than the actuating pressure of a safety valve and higher than the pressure in city water. CONSTITUTION:On the downstream side of a check valve 3 a volume expansion device 8 is connected which is actuated at pressure lower than the pressure to actuate a safety value to alleviate rise in the water pressure in a supply hot water channel 7 and higher than the pressure of the city water. As a result the safety valve 5 does not operate to the extent of the water pressure rise in the supply hot water channel 7 caused by later hot water boiling. It is, therefore, possible to solve the problems of wetting the floor by spilling high temperature hot water jetted out of the safety valve 5, suffering from the scald by receiving hot water to the body, and so on. And, when the water pressure is further raised due to abnormal happenings other than later hot water boiling, the safety valve 5 operates surely so that is possible to prevent the occurrence of accidents such as a breakage in a piping 10 and the safety in a mechanism of hot water supply can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a hot water supply mechanism using a gas instantaneous m-part device or the like.

[Conventional technology and its problems]

As shown in FIG. 5, the gas instant 1m isi'II I!
! ! A safety valve C is usually provided in a hot water supply system using a. If the water pressure in the heating pipe d exceeds abnormally due to after-boiling or dry boiling due to a failure of the W4 control circuit, etc., it will automatically open and release the pumped water in the pipe d to the outside. This is to prevent accidents such as damage to pipe d.

On the other hand, it is common to provide a check valve e on the upstream side of such a hot water supply mechanism. This is because the water pressure in the pipe d of the hot water supply system increases reciprocally higher than the water pressure in the water supply f, and the water from the water supply system bl to the water supply 1! This prevents the water supply from flowing backwards to the f side, especially in areas where the water pressure of the water supply f is significantly reduced by 1N.
The installation of such a check valve e has become essential.

However, if such a check valve e is installed, it is possible to prevent the above-mentioned backflow of the supplied water from the supply 'lAn*b side to the waterworks f side, but on the other hand, there is no place for the water in the pipe d to escape to the upstream side. Therefore, as mentioned above, an abnormal upper limit of pressure due to the rear part etc. is likely to occur, and the safety #C is more likely to be activated. When the safety valve C operates in this way, water will spew out from here, but this spouting of hot water will not be a big problem if the hot water supply mechanism is installed outdoors, but if it is installed indoors, If the safety valve C splashes the hot water directly onto the body, there is a risk of burns. There is also a method of connecting a hose or the like to the safety valve C and pouring it into the drain port, but this method is not aesthetically pleasing and has the problem of getting caught and getting in the way.

In addition, in FIG. 5, numeral 9 is a tap hole, and b is a gas barb.

The present invention aims to solve these problems.

[Means for solving problems]

The structure of the present invention will be explained based on FIGS. 1 to 4 corresponding to the embodiments. First, the supply S mechanism 1 of the invention described in item 1 includes a water supply system 2, a check valve 3, a heat exchanger 4, and safety valve 5
Reverse J) of the hot water supply line 7 leading to the hot water outlet 6 via the hot water outlet 6: A volume expansion device that operates at a set pressure lower than the operating pressure of the safety valve 5 and higher than the water pressure of the water supply 2, located at a suitable location downstream of the valve 3. 8 are connected.

In the invention described in Item 2, the volume expansion device 8 in the hot water supply mechanism 1 of the invention described in Item 1 is constituted by a cylindrical body 9, and the cylindrical body 9 has one side connected to the piping 10 of the hot water supply system path 7. Connection part 11
A cylindrical body 9 is provided to communicate with the piping 10.
A piston 12 is movably provided in the interior in a watertight manner so that the piston 12 can freely approach or separate from the FE and VC parts 11, and is biased in one direction to bring the piston 12 closer to the connecting part 11. The spring 13 is provided inside the cylindrical body 9.

In the invention described in Item 3, the support shaft 14 is provided protrudingly on both sides of the piston 12 in the hot water supply mechanism 1 of the invention described in Item 2, and a bearing 15 of the support shaft 14 is provided on the cylinder body 9. 14 is movably supported on a bearing 15.

The invention described in item 4 is such that the bearing 15 in the hot water supply mechanism 1 according to the invention described in item 3 is provided with the bearing 15 at the connecting portion 11.

[Example of work 1n and actual IIA] The operation of the present invention will be explained with reference to actual examples.

When the water outlet 6 of a faucet or the like is opened, the water from the water supply 2 flows through the check valve 3,
The water flows out from the hot water outlet 6 after passing through the heat exchanger 4 and the safety valve 5. At this time, when the heat exchanger 4 is heated by the svarna 16 etc., the water flowing into the hot water supply mechanism 1 from the water supply 2 passes through the heat exchanger 4. As it passes through, it is heated and reaches a high temperature, so that the lagoon can be supplied from the outlet 6.

In this way, when hot water is being supplied from the hot water outlet 6 to the hot water outlet 6, the water pressure in the hot water supply system line 7 is approximately equal to that of the water supply 2.
Therefore, in such a state, the volumetric expansion device B8 connected to the piping 10 of the hot water supply system line 7 is
Since its operating pressure is higher than the water pressure of water supply 2,
111, and the operating pressure of the safety valve 5 is even higher, so the safety valve 5 also does not operate.

However, when the hot water supply is stopped, the transfer sprue 6
Even if the heating of the heat exchanger 4 is stopped by extinguishing the gas barb 16 at the same time as the gas barb 16 is closed, the heat exchanger 4 and its surroundings will remain at a high temperature for a while, and the hot water supply system Since the water in the pipe 10 on the downstream side of the check valve 3 in the passage 7 is sealed by the outlet 6 and the check valve 3,
The water pressure in the pipe 10 rises rapidly, and as time passes, it gradually falls, dropping to about the water pressure of the waterworks 2, which is a phenomenon that occurs.

The safety valve 5 is originally caused by water pressure in the hot water supply line 7.
This is installed to prevent accidents such as piping 10 etc. bursting due to water pressure in the event of an abnormal rise in water pressure. desirable. This is because if the safety valve 5 operates too frequently, there is a danger that the floor will be soiled by the phlegm ejected from the safety valve 5, or that if it falls directly on the human body, it may cause burns.

Therefore, in the present invention, the check valve 3 of the hot water supply system line 7 is designed so that the safety valve 5 is not activated when the water pressure is high due to the after-boiling as described above, and the safety of the hot water supply mechanism 1 can be ensured. A volume expansion device 8 that operates at a set pressure that is lower than the operating pressure of the safety valve 5 and higher than the water pressure of the water supply 2 is connected to a suitable location downstream a1 of the water supply system. This volume expansion device f
During operation, f8 operates to effectively increase the volume of the hot water supply line 7 to suppress an increase in water pressure within the pipe 10. This operation is carried out by hot water supply system line 7.
To explain in detail the relationship between the water pressure in the pipe 10 and the water pressure in the pipe 10, first, when the water pressure in the pipe 10 is the same as the water pressure in the water supply 2, that is, in a state where water is being supplied from the outlet 6, as shown in Fig. 3 (
As shown in a), the elastic force of the spring 13 is set to the a-th point, and the piston 12 is kept close to the contact M portion 11.

In such a state, when the tap water outlet 6 is used to stop the supply of slag from the tap water outlet 6, the water pressure in the pipe 10 increases due to after-boiling, and when this exceeds the elastic force of the spring 13, the third figure(
As shown in b), the piston 12 moves in a direction away from the connecting portion 11, and when the water pressure in the pipe 10 and the elastic force of the spring 13 are balanced, the piston 12 moves f9JJ-. As a result, the volumes of the piping 10 and the hot water supply line 7 have increased by the amount that the piston 12 has moved, and the pressure rise in the hot water supply line 7 is suppressed, and the safety valve 5 is activated at the level of after-boiling.
It is possible to prevent the pressure from rising to J pressure, so there is no need to operate the safety valve 5. Then, as time passes, the heat exchanger 4 gradually cools down and the after-boiling subsides, and the water pressure inside the piston gradually decreases, and when it becomes smaller than the elastic force of the spring 13, the piston 12
moves in a direction approaching the connection part 11 and stops at the original position, that is, in a state close to the connection part 11 as shown in FIG. 3(a).

The operation of the volume expansion device 1!8 during post-boiling is as described above, but when the water pressure in the pipe 10 further increases due to the occurrence of the 11 abnormal conditions other than I-boiling, the piston 12 moves away from the connecting part 11. The spring 13 moves further to a position where it cannot be compressed any further and stops. When this reaches the expansion limit of the volumetric expansion device WI8, the volumetric expansion device 8 is no longer able to increase the volume of the hot water supply line 7, so that the water pressure in this conduit supply line 7 increases rapidly. Then, the operating pressure of the safety valve 5 is finally reached and the safety valve 5 is operated, so that the safety of the temperature supply mechanism 1 can be ensured.

The piston 12 of the volume expansion device [8 does not cause water leakage,
A structure that allows movement toward or away from the connection part 11 is appropriate, but if it is tilted, it will be difficult to move smoothly, and the inner surface of the inner body 9 may be damaged, which may cause water leakage. Therefore, the support shaft 14 is provided protrudingly on both sides of the piston 12, and the bearing 1 of the support shaft 14 is provided on the cylinder body 9.
5, and the support shaft 14 is movably supported by the bearing 15, the piston 12 will not be tilted and can move smoothly within the cylinder body 9.

As shown in FIG. 4, such a bearing 15 may of course be provided at a location other than the contact radius section 11, but it may be provided at a location other than the contact radius section 11.
If one of them is provided in the connecting portion 11 as shown in the figure, the volume expansion device 8 can be configured to be compact. In this case, in addition to the bearing 15, the connection part 11 has a sleeve 17.
If separately provided, the water pressure in the piping 10 can be controlled by the volume expansion device '11.
8 can be smoothly transmitted.

(Strut of the invention) As described above, since the heating mechanism of the present invention is provided with the check valve upstream of the heat exchanger, it is possible to prevent the backflow of water to the water supply. Since we connected a volumetric expansion device to the downstream side of the check valve to relieve the water pressure in the hot water supply system, the safety valve does not need to be activated when the water pressure in the hot water supply system due to post-heating is about 1. , Problems with the conventional feed mechanism provided with the above-mentioned check valve, namely:
This solves problems such as the safety valve sometimes operating due to after-boiling, which spews out high-temperature turbid water and stains the floor, or the danger of burns if this water directly hits the human body. Even if the water pressure rises due to an abnormal situation other than after-boiling, the safety valve will operate reliably, preventing accidents such as pipes bursting, thereby increasing the safety of the hot water supply system. There is a beam that can be secured.

[Brief explanation of the drawing]

Figures 1 to 4 correspond to embodiments of the present invention, where Figure 1 is an explanatory overall system diagram, Figure 2 is a partial cross-sectional perspective view of volume expansion S*, and Figure 3 (a). , (b) are both Ili side views of the volume expansion gi4 for explaining the operation of the volume expansion device, FIG. 4 is a longitudinal sectional view of another embodiment of the volume expansion Iff in a connected state, and FIG. 5 is a conventional example. It is an explanatory whole system diagram of. Code 1... Water supply ts*m, 2... Water supply, 3... Check valve, 4... Heat exchanger, 5... Safety valve, 6... Hot water outlet, 7... Hot water supply System line, 8... Volume expansion device, 9.
... Cylindrical body, 10... Piping, 11... Connection part, 12.
...Piston, 13...Spring, 14...Support shaft, 1
5... Bearing, 16... Gas burner, 17... Heat supply inlet. (,-J 3rd flash (a) 11th 3rd mtb)! 1! j No. 41!1

Claims (4)

[Claims] (1) At a suitable location downstream of the check valve in the hot water supply line leading from the water supply through the check valve, heat exchanger, and safety valve to the hot water outlet, the water pressure of the water supply is lower than the operating pressure of the safety valve. A hot water supply mechanism characterized by connecting a volumetric expansion device that operates at a higher set pressure. (2) In the hot water supply mechanism described in paragraph 1, the volume expansion device moves the piston in a watertight manner into a cylinder configured to have a connection part to the piping of the hot water supply system line on one side and communicate with the piping. A spring is provided in the cylindrical body so that the piston can move toward or away from the connecting portion, and biases the piston in a direction toward the connecting portion. A hot water supply mechanism according to claim 1. (3) In the hot water supply mechanism according to item 2, the piston has a support shaft protruding from both sides thereof, a bearing for the support shaft is provided in the cylinder, and the support shaft is movably supported by the bearing. A hot water supply mechanism according to claim 1, characterized in that: (4) The hot water supply mechanism according to claim 1, wherein one of the bearings is provided at the connecting portion.