JP3468045B2 - Inspection method of water leak in circulation device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating circulating device connected to various radiators for hot water heating, a bath circulating device connected to a bathtub, or a heating circulating device with a bath circulating device provided with both. The present invention relates to a water leak inspection method for inspecting pipes for water leaks.

[0002]

2. Description of the Related Art There is a conventional heating circulation device with a bath circulation device having a structure shown in FIG. 6, which will be described below as a typical example. The heating circulation device alone or the bath circulation device alone is an extract of some functions of the following heating circulation device with a bath circulation device, and therefore the description thereof is omitted.

This heating circulation device with a bath circulation device is provided with a hot water supply circuit A, a heating circuit B, a bath circuit C, and a drop circuit D, and performs functions of hot water supply, heating, and bath filling and reheating. I have it. The upper side of the broken line in the figure corresponds to the inside of the apparatus main body Z ₀ , and the lower side of the broken line corresponds to the outside of the apparatus main body Z ₀ .

The hot water supply circuit A is provided with a hot water supply heat exchanger 14 heated by a gas burner (not shown), and the incoming water temperature sensor 12 for detecting the incoming water temperature and the incoming water amount detection are provided on the incoming side of the hot water supply heat exchanger 14. A water temperature sensor 13 for use, a can body temperature sensor 15 for detecting the hot water temperature from the hot water supply heat exchanger 14 on the hot water side, a water amount servo valve 1 for limiting the hot water amount, a bath 10 described later, and a currant (not shown). A hot water supply temperature sensor 16 for detecting the hot water supply temperature to each of the above is provided, and a bypass valve 11 is disposed in the middle of a bypass path that short-circuits the incoming water side and the outgoing hot water side by bypassing the hot water supply heat exchanger 14. Is configured.

In the heating circuit B, for example, the apparatus body Z ₀ is connected to the radiators 20 for hot water heating such as a floor heating panel and a fan convector by connecting metal fittings 28a, 28.
b and the external pipes 29a and 29b, and the heating circuit B inside the apparatus main body Z ₀
Heating circulation pump 31, heating heat exchanger 22 heated by a gas burner (not shown), hot water temperature sensor 23 for detecting hot water temperature from heating heat exchanger 22, expansion tank 21 for always ensuring a constant amount of water, bath reheating A bath heater 24, a bath thermal valve 32, and a bypass 25 are provided.

The expansion tank 21 is provided with a water level electrode 46 for water level detection, and one end of each of a replenishment water pipe 48 and an overflow pipe 45 is connected to the replenishment water pipe 4.
The other end of 8 is connected to the water inlet side of the hot water supply circuit A, and the other end of the overflow pipe 45 is open to the atmosphere. In addition, the vacuum breaker 2
7, a rehydration valve 30 and a check valve 47 are provided.

Further, manual valves 60a and 60b for maintenance and inspection are provided in the middle of the external pipes 29a and 29b, and various radiators are provided in the middle of the external pipe 29a for going to the radiator 20. A plurality of thermal valves 33 are provided for the connection of 20.

Normally, the manual valves 60a and 60b are opened except during maintenance and inspection, and the thermal valve 33 among the plurality of thermal valves 33 to which the radiator 20 is actually connected is opened. However, in the place where the radiator 20 is not connected,
It is always closed by a stop plug (not shown).

In the bath circuit C, the device body Z ₀ is connected to the connecting fitting 9
It is configured to be connected to the circulating metal fitting 7 provided in the bathtub 10 via a and 9b and external pipes 26a and 26b, and the bath circuit C inside the apparatus body Z ₀ is connected with the bath heater 24 in the middle thereof. In addition, a pressure sensor 5 for detecting the water level of the bathtub 10, a bath circulation pump 3, a water flow switch 6 for detecting the presence or absence of hot and cold water circulation in the bathtub 10, and a bath temperature sensor 19 for detecting the temperature of the bathtub 10 are provided. Alternatively, the bath heater 24 may not be provided, but a bath heat exchanger may be provided in the bath circuit C to directly heat the gas with a gas burner.

The drop circuit D connects the hot water supply circuit A and the bath circuit C to drop hot water from the hot water supply circuit A into the bathtub 10 through the bath circuit C. A vacuum breaker 17, a drop valve 2, and a check valve 18 are provided.

The operation of the above configuration will be described.

When hot water is supplied to the radiator 20 for heating In this case, the gas burner is burned to heat the heating heat exchanger 22 and the heating circulation pump 31 is driven by the control of a controller (not shown). is, after being heated in the heating heat exchanger 22 hot water in the expansion tank 21 is flow out in the heating circulation pump 31, the device body Z ₀ device from the inner side body Z ₀ is external side forward external piping 29a, radiator 20 and the return external pipe 29b is sequentially circulated.

In this case, since the bath thermal valve 32 is closed, it does not flow in the bath heater 24.

When it is detected by the water level electrode 46 that the amount of hot water in the expansion tank 21 has become less than a predetermined amount due to evaporation or the like, the rehydration valve 30 is opened and the hot water supply circuit A is opened.
Water from the side passes through the replenishment pipe 48 and the expansion tank 21
Water is replenished inside.

When Performing Bath Reheating In this case, under the control of a controller (not shown), on the heating circuit B side, all the thermal valves 33 are closed, the gas burner is burned, and the heating heat exchanger 22 is heated. At the same time, the heating circulation pump 31 is driven, and the bath thermal valve 32 is opened. Further, in parallel with this, on the bath circuit C side, the bath circulation pump 3 is activated and the hot and cold water in the bathtub 10 is circulated in the bath circuit C.

As a result, on the heating circuit B side, after the hot water in the expansion tank 21 flows out by the heating circulation pump 31 and is heated by the heating heat exchanger 22, the bath heat valve 32 expands from the bath heater 24. It is circulated via the tank 21. When passing through the bath heater 24, the hot and cold water flowing in the bath circuit C is heated, and the bath water stored in the bath 10 is reheated.

When the radiator 20 is used at the same time, the thermal valve 33 is opened, the hot water heated by the heating heat exchanger 22 is branched and passes through the bath heater 24, and the same as above. , The outside of the apparatus main body Z ₀ , the radiator 20, and the return external pipe 29b are sequentially circulated.

In the case where hot water is dropped into the bathtub 10 In this case, hot water adjusted to a predetermined temperature by the hot water supply circuit A is fed into the bathtub 10 through the drop circuit D and the bath circuit C.

By the way, tub 10 by using the case where newly installing a bathtub 10 and the radiator 20 with the apparatus main body Z _0, the device body Z ₀ the external piping 26a, 26b, 29a, and 29b, etc.
It will be connected to the radiator 20 and the radiator 20, but at that time, it is necessary to inspect the piping system for water leakage. In particular, external pipes 29a, 29b for connecting to the radiator 20
Are often laid around for a long time, so it is important to inspect for water leakage after construction.

Therefore, in the prior art, after the completion of piping work, a water leak inspection is performed as follows.

For example, in the case of a water leak test on the radiator 20 side, first, a hand-pressurizing pump 70 and a pressure gauge 72 are used to remove predetermined portions of the external pipes 29a and 29b, and then, The pressurizing pump 70 is connected to the removed external pipe 29a on the forward side, while the external pipe 29 on the return side is connected.
Install a stop valve (not shown) on b.

Then, with the stop valve initially opened, the pressurizing pump 70 is manually operated to remove air from the pipe, and then the stop valve is closed and the pressurizing pump 70 is operated again to operate the pipe. Apply a predetermined water pressure inside. Then, after a lapse of a predetermined time (for example, 2 to 3 minutes), the pressure gauge 72 examines the change in water pressure with time, and inspects whether or not water leakage has occurred in the pipe.

[0023]

However, as described above, in the water leakage inspection after the completion of the piping work, after the water pressure is applied to the inside of the piping by using the hand-pressurizing pump 70,
In the method of visually observing the change of the pressure gauge 72 to determine the presence or absence of water leak, it is unclear whether the pressure drop immediately after the completion of pressurization is due to water leak, and it may take some time after the completion of pressurization. Even if the judgment is started later, there is a possibility that the judgment result of the water leak will be inaccurate because there are individual differences in how the time is set.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an inspection method capable of determining the presence or absence of water leakage more accurately than before.

[0025]

In order to solve the above problems, the present invention comprises a heating circuit connected to various radiators for hot water heating and / or a bath circuit connected to a bathtub. The following measures are adopted in the method for inspecting water leakage in a circulating device.

That is, according to the first aspect of the invention, the heating circuit and / or the bath circuit is formed as a closed circuit that is not opened to the atmosphere, and a predetermined water pressure P _{H is applied} to the closed circuit.
After a lapse of a fixed time after adding, the water pressure P in the closed circuit is compared with a preset reference value P _L, and if P ≧ P _L ,
Further, the water pressure decrease rate α is examined, and it is determined that there is no water leakage only when the water pressure decrease rate α is less than or equal to a preset threshold value Ka (α ≦ Ka).

According to the second aspect of the present invention, the heating circuit and / or the bath circuit is formed as a closed circuit which is not released into the atmosphere, and after applying a predetermined water pressure P _N to the closed circuit, the closed circuit is formed. The water pressure decrease rate α in the inside is checked, and the remaining time T until the water pressure decrease rate α reaches a preset reference value Kb is measured, and the measurement time T is set to the preset reference value Tb.
If h or less (T ≦ Th), it is determined that there is no water leakage.

In the third aspect of the present invention, the heating circuit and / or the bath circuit is formed as a closed circuit that is not opened to the atmosphere, and a predetermined water pressure P _H is applied to the closed circuit, and then the closed circuit is formed. Time T until the water pressure decrease rate α in the inside is checked and the water pressure decrease rate α reaches a preset reference value Kb
Is measured, and the measured time T is a preset reference value Th
If (T ≦ Th) or less, the water pressure decrease amount ΔPs is further calculated within a certain time Ts, and this water pressure decrease amount ΔPs is compared with a preset threshold value Kc to determine the water pressure decrease amount ΔPs. It is judged that there is no water leakage only when the value is less than or equal to (ΔPs ≦ Kc).

According to the invention described in claim 4, claims 1, 2,
In the method described in any one of 3 above, the threshold values Ka and Kc for determining the presence or absence of water leakage are set in multiple stages.

According to the invention of claim 5, in the method of claim 4, each threshold value K divided into multiple stages is used.
The determination of the presence or absence of water leakage based on the comparison of a and Kc is performed in parallel at the same time.

[0031]

1 is a diagram showing the configuration of a heating circulation device with a bath circulation device according to an embodiment of the present invention,
The parts corresponding to those of the conventional example shown in FIG.

In this embodiment, inside the apparatus main body Z ₁ , rim cut valves 34 and 35 are provided before and after the pipe connected to the expansion tank 21 of the heating circuit B, and the external pipe 29b on the return side is connected. Pressure relief valve 50 on connection fitting 28b
Is provided.

Then, at the time of water leak inspection, the adapter 4 is attached to the circulation fitting 7. This adapter 4
As shown in FIG. 2, the external piping 26a, 26b of the bath circuit C
Is for short-circuiting the two without opening the inside of the bathtub 10, and the adapter 4 is provided with a pressure safety valve 57.

When inspecting for water leakage, the bath circuit C is used.
One end of the branch pipe 53 is connected to the forward side connection fitting 9a, and the other end of the branch pipe 53 is connected to one thermal valve 33 provided in the outward side pipe 29a of the heating circuit B.

The other structure is the same as that of the conventional example shown in FIG. 6, and therefore the detailed description is omitted.

Next, a method for conducting a water leak inspection in the configuration shown in FIG. 1 will be described. In this case, control such as opening / closing of each valve is performed by a controller (not shown).

First, the procedure for applying a predetermined water pressure to the heating circuit B and the bath circuit C will be described.

First, with the drop valve 2 of the drop circuit D closed and the water volume servo valve 1 of the hot water supply circuit A closed, the expansion tank 2 is closed.
The edging valves 34 and 35 before and after 1 are closed, and the bath circuit C and the heating circuit B are brought into communication with each other via the branch pipe 53.

Next, after opening the drop valve 2 of the drop circuit D, the water amount servo valve 1 of the hot water supply circuit A is gradually opened in order to avoid sudden application of water pressure to the heating circuit B and the bath circuit C. Then, the water pressure of the tap water that has passed through the hot water supply circuit A is applied to the bath circuit C via the drop circuit D, and the branch pipe 53
It also participates in the heating circuit B via.

However, in this case, since the front and rear edge cutoff valves 34 and 35 of the expansion tank 21 are closed, no water pressure is applied to the inside of the expansion tank 21. In addition, each circuit B,
The air in the pipe of C is discharged through the pressure relief valves 50 and 57, so that the inside of the pipe is reliably filled with water.

[0041] Then, while missed excess pressure in the pressure relief valve 50, 57 to the water pressure P detected by the pressure sensor 5 of the bath circuit C has been previously adjusted to a predetermined value P _H, the amount of water of the hot water supply circuit A Both the servo valve 1 and the drop valve 2 are fully closed. As a result, the bath circuit C and the heating circuit B are formed as one closed circuit.

(1) Water Leakage Judging Method for Heating Circuit B and Bath Circuit C (Part 1) External Piping 29a, 29b, 26a, 26b for Each Circuit B, C
Since a resin made of heat-resistant polyethylene or the like may be used, the water pressure P detected by the pressure sensor 5 may be used.
Will gradually decrease due to expansion of the pipes of the circuits B and C, regardless of the presence or absence of water leak, but if there is water leak in the pipe, the degree of water pressure drop will increase.

Therefore, as described above, a predetermined water pressure P is applied to one closed circuit consisting of the bath circuit C and the heating circuit B.
_{When H} is added (time t ₀ ), instead of immediately determining the water leak, as shown in FIG. 3 (a), wait until a certain time (few minutes to tens of minutes) elapses, and Time t ₁ after the period
First, the water pressure P in the closed circuit is compared with a preset reference value P _L.

If P <P _L , it is estimated that there is a large degree of water pressure drop and there is water leakage, so it is determined to be unacceptable (in the case of the curve indicated by the symbol F ₃ in FIG. 3A). .

On the other hand, if P ≧ P _L , then FIG.
As shown in, the change in water pressure P per unit time Δt ΔP
The water pressure decrease rate α (= ΔP / Δt), which is the ratio of the above, is checked, and the water pressure decrease rate α at that time is compared with a preset threshold value Ka.

When the water pressure decrease rate α is larger than the threshold value Ka (α> Ka), the degree of water pressure decrease is still large and it is estimated that there is water leakage. 3 (a) in the case of the curve indicated by the symbol F ₂ .

On the other hand, the water pressure decrease rate α is the threshold value K.
In the case of a or less (α ≦ Ka), the degree of water pressure drop is small, and it is estimated that there is no water leakage due to only expansion of the pipe.
It is determined to be acceptable (in the case of the curve indicated by the symbol F ₁ in FIG. 3A).

Then, the controller (not shown) informs the inspector of the pass / fail by a buzzer or a lamp.

As a result, the heating circuit B and the bath circuit C
The presence / absence of water leakage can be determined more accurately than before.

In order to form the bath circuit C and the heating circuit B as one closed circuit, first, a predetermined water pressure P _{H is set.}
If the water pressure P _H is not reached even if the pressure is added, it is considered that not a slight water leak such as looseness of the packing of the pipe, but a large water leak such as disconnection of the pipe. Therefore, of course, it will be a failure judgment.

(2) Water Leakage Judgment Method for Heating Circuit B and Bath Circuit C (Part 2) In addition to the water leak judgment method described in (1) above, the presence or absence of water leak can be judged as follows. It is also possible to do so.

As described above, if a predetermined water pressure P _H is applied to one closed circuit consisting of the bath circuit C and the heating circuit B (time t ₀ ), the rate of decrease in water pressure in the closed circuit from that point onward. The α is checked, and the water pressure decrease rate α is the reference value K set in advance.
Measure the time T until reaching b.

For example, in the case of the curve indicated by reference sign F ₁ in FIG. 4A, the time until the water pressure decrease rate α reaches the reference value Kb is T ₁ , and in the case of the curve indicated by reference sign F _2. , The time taken for the water pressure decrease rate α to reach the reference value Kb is T ₂ , and the code is F
_In the case of the curve shown by ₃ , the time until the water pressure decrease rate α reaches the reference value Kb is T ₃ , and as the degree of water pressure decrease increases from F ₁ → F ₂ → F ₃ , the reference value Kb is reached. It takes a long time (T ₁ <T ₂ <T ₃ ).

Therefore, when the measured time T (T ₁ , T ₂ , T ₃ ) exceeds the preset reference value Th (T> Th), it is estimated that the water pressure is largely reduced and there is water leakage. Therefore, it is determined to be unacceptable (in the case of the curve indicated by reference sign F ₃ in FIG. 4A), and the others are regarded as acceptable.

That is, within the reference value Th, the water pressure decrease rate α
When the value reaches the reference value Kb, it passes, and when it does not reach it, it fails.

(3) Water Leakage Judging Method for Heating Circuit B and Bath Circuit C (Part 3) In the method of (2) above, if a more rigorous inspection is performed, if T ≦ Th, the test is started, As shown in FIG. 4B, a water pressure decrease amount ΔPs within a fixed time Ts (about several minutes) is obtained, and this water pressure decrease amount ΔPs is compared with a preset threshold value Kc.

When the water pressure decrease amount ΔPs is larger than the threshold value Kc (ΔPs> Kc), it is estimated that the water pressure decrease amount is still large and there is water leakage, and therefore it is determined to be unacceptable (Fig. 4 (a) in the case of the curve indicated by the symbol F ₂ .

On the other hand, when the water pressure decrease amount ΔPs is less than or equal to the threshold value Kc (ΔPs ≦ Kc), the degree of water pressure decrease is small and it is estimated that there is no water leakage, so it is judged as pass (Fig. 4 (a) in the case of the curve indicated by the symbol F ₁ .

In the cases of the above methods (2) and (3), in order to form the bath circuit C and the heating circuit B as one closed circuit, even if a predetermined water pressure P _H is first applied,
If the water pressure P _H is not reached, it is considered that not a slight water leak such as looseness of the packing of the pipe, but a large water leak such as disconnection of the pipe. Will be judged.

(4) Water Leakage Judging Method for Heating Circuit B and Bath Circuit C (Part 4) In the method (1), a single threshold value Ka is used to judge the presence or absence of water leakage. On the other hand, in the method (4), the threshold value Ka is set in multiple steps (Ka = Ka ₁ , Ka ₂ , K).
a ₃ , ..., However, it is set separately for Ka ₁ > Ka ₂ > Ka ₃ > ...), and each threshold value Ka (= Ka ₁ ,
Ka _2, Ka _3, so that a determination of the presence or absence of water leakage based on a comparison of ...) simultaneously in parallel.

The procedure will be specifically described below with reference to the flow chart shown in FIG.

When the start button is pressed (step 1), pressurization to the heating circuit B and the bath circuit C is started by the procedure described above.

The predetermined water pressure P _H (here, 2 kg / cm
² ) is applied, the water pressure P _H remains constant for a certain time (here, 1
It is checked whether it continues for 0 seconds or more (step 2).

When the predetermined water pressure P _H is not continued,
Not a slight water leak such as loose packing of piping,
Since it is considered that a large water leak such as disconnection of the pipe has occurred, if the state where the predetermined water pressure P _H cannot be continued for, for example, 50 minutes (step 3),
Since there is no possibility of repairing water leak, judgment of failure (error)
(Step 4).

In step 2, if the water pressure P _H continues for a certain period of time or more, the next judgment operation is started. Therefore, after the buzzer notifies that fact (step 5), the water pressure detected by the water pressure sensor 5 is detected. It is checked whether P is greater than or equal to a preset reference value P _L (here, 1.5 kg / cm ² ) (step 6).

Immediately after steps 2 and 5, step 6 is of course YES, but if there is a lapse of time after step 8 which will be described later and the water pressure P is below the reference value P _L , a measurable water pressure is obtained. However, since the degree of decrease in water pressure is large, it is estimated that there is water leakage, and a failure judgment is made (error) (step 7).

On the other hand, if the water pressure P is larger than the reference value P _L , the water pressure decrease rate α is obtained, and the water pressure decrease rate α is divided into three levels to set the respective threshold values Ka ₁ , Ka ₂ , K
At the same time with a ₃ (however, Ka ₁ > Ka ₂ > Ka ₃ ), comparison is made (steps 8, 9, 10).

Then, the water pressure decrease rate α is set to the respective threshold values Ka ₁ ,
When the state of being larger than Ka ₂ and Ka ₃ continues for 5 times or 10 times, for example, the degree of water pressure drop is still large and it is estimated that there is water leakage.
(Error) (Steps 11, 12, 13, 14, 1)
0,17).

However, since the failure judgment is made with the threshold values Ka ₁ , Ka ₂ and Ka ₃ different from each other, the degree of water leakage can be estimated.

On the other hand, the rate of decrease in water pressure α is any threshold K
If it is smaller than a ₁ , Ka ₂ , Ka ₃ (step 18),
Since it is estimated that the degree of water pressure drop is small and there is no water leak, it is determined to be acceptable (step 19).

The reason why α ≦ Ka ₃ continues 10 times in step 17 is to increase the certainty of the determination of no water leakage. The reason why the passage of time is to be seen in step 15 is to prevent erroneous determination that there is a leak even though the threshold value Ka ₃ is strict and is normal, and an error is displayed as a leak after a lapse of a predetermined time. (Step 16).

As described above, according to the method (4), it is possible to judge the degree of water leakage by classifying it into large, medium, and small. Therefore, it is easy to identify the location of the leakage, and the measures after the inspection are taken. Can stand up.

In the explanation of the method (4), the threshold value K
The case where a is divided into three stages (= Ka ₁ , Ka ₂ , Ka ₃ ) has been described, but the present invention is not limited to this and can be set in two stages or in four or more stages. You can also Furthermore, each step is not performed at the same time but in order [S8 (→ S11) → S9 (→ S13) → S10 (→ S1
7)] may be determined, but in this case, it takes a lot of time before the acceptance determination.

In the method (4), the method (1) has been described as a basic method. However, also in the methods (2) and (3), the threshold value threshold value Kc is set in multiple steps (Kc = Kc ₁ , Kc ₂ , K
c ₃ , ..., However, Kc ₁ > Kc ₂ > Kc ₃ > ...) are set separately, and each threshold value Kc (= Kc) for the water pressure decrease amount ΔPs is set.
It is also possible to simultaneously judge the presence / absence of water leakage based on the comparison of ₁ , Kc ₂ , Kc ₃ , ...) In parallel.

Further, in this embodiment, the case where the water leak inspection of the heating circuit B and the bath circuit C is collectively performed has been described. However, if an opening / closing valve is provided in the middle of the pipes 26a and 26b of the bath circuit C. It is possible to perform a water leak test only on the heating circuit B, and by providing an opening / closing valve in the middle of the branch circuit 53, it is possible to test a water leak only on the bath circuit C.

Further, in this embodiment, the pressure sensor 5 for controlling the bath water level is used for the water leak inspection, but a pressure sensor dedicated to the leak inspection may be separately provided in the circuit to be inspected.

[0077]

According to the present invention, not only can the heating circuit and the bath circuit be independent of each other, or both circuits can be collectively checked for the presence or absence of water leakage automatically, and water leakage inspection can be performed more than before. It can be performed more accurately and the reliability of the inspection result is enhanced.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a heating circulation device with a bath circulation device according to an embodiment of the present invention.

[Fig. 2] An explanatory view when an adapter used for water leak inspection of a bath circuit is attached to a circulating metal fitting of a bathtub.

FIG. 3 is an explanatory diagram when a pass / fail judgment is made in a water leak inspection.

FIG. 4 is an explanatory diagram when a pass / fail judgment is made in a water leak inspection.

FIG. 5 is a flow chart for explaining a case where a pass / fail judgment is made in a water leak inspection.

FIG. 6 is a diagram showing a configuration of a conventional heating device with a bath.

[Explanation of symbols]

Z ₁ ... Device body, A ... Hot water supply circuit, B ... Heating circuit, C ... Bath circuit, D ... Drop circuit, 1 ... Water quantity servo valve, 2 ... Drop valve, 3 ... Bath circulation pump, 4 ... Adapter, 5 ... Pressure Sensor, 7 ... Circulation fitting, 10 ... Bathtub, 20 ... Radiator, 21 ...
Expansion tank, 22 ... heating heat exchanger, 24 ... bath heater,
26a, 26b, 29a, 29b ... External piping, 30 ... Water supply valve, 31 ... Heating circulation pump, 34,35 ... Edge cutoff valve, 4
5 ... Overflow piping, 48 ... Replenishment piping, 53 ... Branch piping.

Continuation of the front page (56) Reference JP-A-9-178200 (JP, A) JP-A-62-14033 (JP, A) JP-A-7-91711 (JP, A) Actual Kaihei 5-64651 (JP , U) Actual development Sho 58-191544 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F24D 3/00-3/10 F24H 1/00 G01M 3/00

Claims (5)

(57) [Claims] 1. A method for water leakage inspection in a circulation device comprising a heating circuit connected to various radiators for hot water heating and / or a bath circuit connected to a bathtub, the method comprising: The circuit and / or the bath circuit is formed as a closed circuit that is not opened to the atmosphere, and after a predetermined time has passed after a predetermined water pressure P _H is applied to the closed circuit, the water pressure P in the closed circuit is preset. If P ≧ P _L , the water pressure decrease rate α is further checked by comparing with the reference value P _L, and water leakage only occurs when the water pressure decrease rate α is less than or equal to a preset threshold value Ka (α ≦ Ka). A method for inspecting water leakage in a circulation device, characterized by determining that there is no 2. A method for inspecting for the presence or absence of water leakage in a circulating device comprising a heating circuit connected to various radiators for hot water heating and / or a bath circuit connected to a bathtub, said method comprising: The heating circuit and / or the bath circuit is formed as a closed circuit that is not released into the atmosphere, and a predetermined water pressure P _N is applied to the closed circuit, and then the water pressure decrease rate α in the closed circuit is examined to reduce the water pressure. Reference value K with preset rate α
A water leak test in a circulation device, characterized in that the time T remaining until reaching b is measured, and if the measured time T is less than or equal to a preset reference value Th (T ≦ Th), it is determined that there is no water leak. Method. 3. A method for inspecting a circulating device having a heating circuit connected to various radiators for hot water heating and / or a bath circuit connected to a bathtub for water leakage. The heating circuit and / or the bath circuit is formed as a closed circuit that is not opened to the atmosphere, a predetermined water pressure P _H is applied to the closed circuit, and then the water pressure decrease rate α in the closed circuit is examined.
The time T until the water pressure decrease rate α reaches the preset reference value Kb is measured, and if the measurement time T is equal to or less than the preset reference value Th (T ≦ Th), the constant time Ts The amount of water pressure decrease ΔPs in the
s is compared with a preset threshold value Kc, and the water pressure decrease amount Δ
A method for inspecting water leakage in a circulating device, which determines that there is no water leakage only when Ps is less than or equal to a threshold value (ΔPs ≦ Kc). 4. The water leakage inspection method for a circulating device according to claim 1, wherein the threshold values Ka and Kc for judging the presence or absence of water leakage are divided into multiple stages. A method for inspecting water leakage in a circulation device, characterized by being set as follows. 5. The method for inspecting water leakage in a circulating device according to claim 4, wherein the presence / absence of water leakage is simultaneously determined in parallel based on the comparison of the threshold values Ka and Kc divided into multiple stages. A method for inspecting water leakage in a circulation device.