JP4255501B2 - Fitting for heat source machine - Google Patents

Description

  The present invention is connected to the return port or the discharge port in the heat source apparatus having a heat medium passage extending from the return port of the heat medium circulatingly supplied to the terminal to the discharge port of the heat medium via the heat medium heating means. The present invention relates to a heat source machine joint.

As such a heat source device joint, for example, in a heating system using hot water, a plurality of heating devices that are terminals are divided by dividing hot water as a heat medium supplied from a hot water supply device that is a heat source device. There are a supply header for supplying to the hot water, a return header for joining hot water from a plurality of heating devices and returning them to the hot water supply device.
And in this kind of heating system etc., it is necessary to perform the airtight test | inspection with respect to the heating apparatus side which is a terminal device after completion of construction.

Therefore, conventionally, in the supply header or return header connected to the discharge port from the heat source unit or the return port to the heat source unit, a plurality of terminals to which the heat source unit side connection portion and the terminal side heat medium flow pipe are connected Switch between a heat medium flow state that connects the heat source unit side connection part and the terminal side connection part and an inspection state that blocks communication between the heat source unit side connection part and the terminal side connection part. A switching valve to be operated is provided, the switching valve is switched to the inspection state, one of the plurality of terminal side connection portions is used as the inspection connection portion, and the inspection fluid is supplied from the supply pipe connected to the inspection connection portion. Then, the terminal side is pressurized to perform an airtight inspection.
Conventionally, a male screw is provided on the switching valve side, and a female screw is provided on the header body side that holds the switching valve. The male screw on the switching valve side is screwed into the female screw, and the operation unit connected to the switching valve is rotated. By operating and rotating the male screw on the switching valve side in the screwing direction, the switching valve is switched to the inspection state, and the operation unit is rotated to the reverse direction, so that the switching valve is switched to the heat medium flow state. Was configured.

An object of the present invention is to provide a joint for a heat source machine capable of preventing leakage of water after completion of an airtight inspection.

In order to achieve this object, according to the first aspect of the present invention, there is provided a heat medium passage extending from the return port of the heat medium circulated and supplied to the terminal unit to the discharge port of the heat medium via the heat medium heating means. A heat source machine joint connected to the return port or discharge port of the heat source machine, to which a heat source machine side connection portion connected to the return port or the discharge port and a heat medium flow pipe on the terminal side are connected. The terminal-side connecting portion and the inspection connecting portion to which the inspection fluid supply pipe is connected are provided so as to communicate with each other, and the communication between the heat source unit-side connecting portion and the terminal-side connecting portion is blocked. A switching valve that can be switched by sliding to a state and a heat medium flow state that releases the shut-off and communicates the heat-source-unit-side connection portion and the terminal-side connection portion, and is provided in the inspection connection portion. The inspection fluid supplied from the supply pipe is allowed to flow. Check valve for preventing reverse flowing is provided with its flow direction.

That is, by switching the switching valve to a heat medium flow state, the heat medium discharged from the discharge port in the heat source machine is supplied to the terminal device via the heat source machine side connection part and the terminal side connection part, The heat medium from the terminal device can be returned from the return port to the heat source device via the terminal side connection portion and the heat source device side connection portion.
Further, by switching the switching valve to the inspection state, the inspection connection portion and the terminal side connection portion are communicated with each other while the communication between the heat source machine side connection portion and the terminal side connection portion is blocked. The fluid for inspection from the connecting portion for supplying is supplied to the heat medium flow pipe and the terminal device through the terminal side connecting portion and pressurized to perform the airtight inspection on the terminal device side.

In addition, after the airtight inspection is completed, even if the supply pipe for supplying the inspection fluid is removed from the inspection connection section, the inspection fluid that has been filled in the heat medium flow pipe on the terminal side is not removed. There is no risk of leaking outside. In other words, it is possible to use, for example, tap water as the inspection fluid, and it is not necessary to prepare a compressor or the like for the airtight inspection, and also prevents leakage of water after the airtight inspection is completed. be able to.

According to the invention described in claim 2, when the switching valve is at a position corresponding to the inspection state, by rotating the operation portion of the switching valve around the axis along the sliding direction, The locked portion provided on the switching valve side engages with the locking portion provided on the joint body side, and the switching valve in the inspection state is prevented from sliding to the heat medium flow state side. The inspection side engagement state and the engagement release state in which the sliding of the switching valve to the heat medium flow state side is permitted.

That is, since the switching valve can be switched between the heat medium flow state and the inspection state by sliding the operation portion, the switching valve can be easily switched compared to the conventional structure described above. For switching to the inspection state, the locked portion provided on the switching valve side is moved to the joint body side by rotating the operation portion around the axis along the sliding direction. Since it is switched to the inspection side engagement state where the switching valve in the inspection state engaged with the provided locking portion is prevented from sliding to the heat medium flow state side, it is easy just to rotate the operation portion With the simple operation, the switching valve can be reliably held in the inspection state, and the switching operation of the switching valve can be reliably performed in a short time.

Embodiments of a heat source machine joint according to the present invention will be described with reference to the drawings.
Such a heat source machine joint is used in association with a heating system using a general household hot water supply device, and the hot water supply device itself has a fin tube type hot water supply heat as shown in FIG. A general hot water supply device A provided with the exchanger 1, a bath remedy device B provided with a fin tube type heat exchanger 2, and a fin tube type heating heat as an example of a heating medium heating means. The heat source machine C for heating provided with the exchanger 3 is comprised.
This hot water supply device supplies hot water to a general hot water tap 4 such as a currant or a shower, fills the bathtub 5 with water, keeps track of the hot water in the bathtub 5, and also provides a floor heating device, a bathroom heating device, and tableware. It is used to circulate and supply hot water as a heating medium to a heating terminal D such as a washing machine or a fan convector.

In addition to the hot water supply heat exchanger 1, the hot water supply apparatus A heats the water supply path 6 connected to the inlet side of the heat exchanger 1, the hot water supply path 7 connected to the outlet side, and the hot water supply heat exchanger 1. The water heater 6 is connected to the household water pipe and the hot water supply path 7 is connected to the hot water supply pipe 9 to heat the water from the water pipe, and the heated hot water is supplied to the hot water supply pipe 9. It is constituted so that it may discharge from hot-water tap 4 provided in.
The water supply path 6 is provided with a water filter 6 a, an accumulator 6 b, a water supply thermistor 6 c, a water amount sensor 6 d, a bypass path 6 e that bypasses the heat exchanger 1 and supplies water from the water supply path 6 to the hot water supply path 7. The hot water supply passage 7 includes a hot water supply thermistor 7a, a mixing valve 7b for adjusting the mixing ratio of hot water from the heat exchanger 1 and water from the bypass passage 6e, a mixing thermistor 7c, a water proportional valve 7d, an interrupting water amount sensor 7e, An overpressure prevention device 7f and the like are provided.

In addition to the heat exchanger 2 for the memorial service, the memorial device B has a bath return path 10 connected to the inlet side of the heat exchanger 2, a bath return path 11 connected to the outlet side, the bath return path 10 and a hot water supply. A hot water filling passage 12 that communicates with the passage 7, the gas burner 8 that heats the heat exchanger 2 for remedy, and the like.
A bathtub-side return path 5b extending from the adapter 5a of the bathtub 5 via a joint 13 is connected to the bath return path 10, and a bathtub-side return extending from the adapter 5a of the bathtub 5 via a joint 14 to the bath return path 11. The path 5c is connected, and is configured to fill the bathtub 5 or memorize the hot water of the bathtub 5.
Therefore, the bath return path 10 includes a water level sensor 10a for detecting the water level in the bathtub 5 based on the pressure acting on the bath return path 10, a return thermistor 10b, a two-way valve 10c, an air replacement solenoid valve 10d, an additional valve. A circulation pump for eaves 10e and a water flow switch 10f are provided, a forward thermistor 11a is provided in the bath going path 11, and a hot water solenoid valve 12a is provided in the hot water filling path 12.

In addition to the heat exchanger 3 for heating, the heat source unit C for heating includes a high-temperature forward path 15 connected to the outlet side of the heat exchanger 3, a heat medium return path 16 connected to the inlet side of the makeup water tank T, and the like. A high-temperature side heat medium passage HR constituted by a low-temperature forward path 18 branched from the heat medium path 17 that connects the outlet side of the makeup water tank T and the inlet side of the heat exchanger 3, and the heat medium return path 16 The low-temperature-side heat medium passage LR and the gas burner 19 that heats the heat exchanger 3 are configured.
A high temperature supply header HD1 as a heat source machine joint is connectable to the discharge port 15a of the high temperature side heat medium passage HR provided on one end side of the high temperature outgoing path 15, and one end side of the heat medium return path 16 is configured. A return header HD2 as a joint for a heat source machine is connectable to the return port 16a of the high-temperature side heat medium passage HR provided in the high-temperature side heating medium passage HR, and the high-temperature supply header HD1 and the high-temperature terminal D for heating are configured. As a heat medium by connecting the terminal D and the return header HD2 via a plurality of return side heat medium flow pipes 21. The high temperature hot water is circulated and supplied to the high temperature type terminal device D.

  Similarly, a low-temperature supply header HD3 as a joint for a heat source machine is connectable to the discharge port 18a of the low-temperature side heat medium passage LR provided on one end side of the low-temperature forward path 18. By connecting the supply header HD3 and a low temperature type terminal not shown in the figure with a forward side heat medium flow pipe, and connecting the low temperature type terminal unit and the return header HD2 with a return side heat medium flow pipe, The low-temperature hot water as is circulated and supplied to a low-temperature terminal.

  That is, by driving the heat medium circulation pump 22 provided in the heat medium passage 17, the high temperature thermistor 15b provided in the high temperature forward path 15, the low temperature thermistor 18b provided in the low temperature forward path 18, and the heat medium return. The water supplied to the make-up water tank T from the water supply path 6 through the tank water supply path 23 based on the management of hot water flow based on the detection result of the return thermistor 16b provided in the path 16 is a heat exchanger for heating. 3, and is supplied to the high-temperature terminal D via the high-temperature forward passage 15, the high-temperature supply header HD 1, and the forward-side heat medium flow pipe 20, and bypasses the heating heat exchanger 3. The high temperature terminal D and the hot water from the low temperature terminal are returned to the low temperature terminal 18 and the low temperature supply header HD3. HD2 and heating medium return path 1 It is configured to be returned to the makeup water tank T through.

The tank water supply passage 23 is provided with a make-up water valve 23a and a make-up water electromagnetic valve 23b. The make-up water tank T has an upper limit sensor 24a for detecting the upper limit of the water level and a lower limit sensor 24b for detecting the lower limit. And an overflow path 24c is connected.
In addition, the gas supply path 25 for supplying combustion gas to the gas burner 8 for heating the hot water supply heat exchanger 1 and the reheating heat exchanger 2 and the gas burner 19 for heating the heating heat exchanger 3 has an original gas electromagnetic wave. A valve 25a, a gas proportional valve 25b for hot water supply, a gas electromagnetic valve 25c, a gas switching electromagnetic valve 25d, a gas electromagnetic valve 25e for heating, a gas proportional valve 25f for heating, and the like are provided.

  Next, the high-temperature supply header HD1 and the return header HD2 and the joints attached to the headers HD1 and HD2 will be described. The high-temperature supply header HD1 and its joint, and the return header HD2 and its joint Since it is configured in exactly the same structure except that the flow direction of the medium is reversed, only the high-temperature supply header HD1 will be described, and the description of the return header HD2 will be omitted to avoid redundant description.

As shown in FIGS. 2 and 3, the high-temperature supply header HD1 is provided with a straight cylindrical heat medium passage joint body 31, a straight tubular valve slide joint body 32, and an O-ring at the end. The whole is provided with a heat source side insertion portion 33 as a cylindrical heat source machine side connection portion and the like, and is configured in a T shape, and the entire T shape header is formed as an integrally molded product made of synthetic resin.
In the heat medium flow joint body 31, the two branch pipes 34, the branch pipes 34, and the like are aligned in the circumferential direction and aligned along the longitudinal direction of the cylinder. One branch pipe 36 having a different structure and one inspection pipe 38 are integrally formed of a synthetic resin, and each of the branch pipes 34 and 36 has the above-described forward-side heat medium flow pipe 20. Terminal-side openings 35 and 37 are provided as terminal-side connection portions to be connected to each other, and the inspection tube 38 is connected to a supply tube for supplying a later-described inspection fluid as an inspection connection portion. An inspection opening 39 is provided.

The inspection pipe 38 is disposed at a position close to the valve slide joint body 32, and is connected to the outer peripheral portion of the branch pipe 36 adjacent to the inspection pipe 38, that is, the forward side heat medium flow pipe 20. A plurality of step portions 36a for preventing the tube from being removed are arranged side by side in the insertion direction of the insertion portion, and the other two branch pipes 34 are provided in the insertion portion to be inserted into the inner fitting state. Is not provided with a step as described above.
The branch pipe 36 provided with the step portion 36a is connected to the large-diameter heat medium flow pipe 20 by being externally fitted, and the terminal-side opening 35 provided in the other two branch pipes 34 is connected to the branch pipe 36. The heat medium flow pipe 20 having a small diameter is connected via a linear joint 40 made of synthetic resin, and the end opening 41 of the heat medium flow joint body 31 is provided with an O-ring. Plug 42 is inserted and closed.

At the back of the inspection opening 39 provided in the inspection tube 38, as shown in an enlarged view in FIG. 6, a check valve made of an elastic body such as rubber having a flow hole 43a at the tip. 43 is accommodated and attached by a stopper 44, and connected to the drainage portion 14a of the joint 14 provided in the bathway 11 as shown by the one-dot chain line in FIG. The supply pipe 45 is configured to be connectable.
As shown in FIG. 7, the supply pipe 45 has a drain-side adapter 45a connected to the drain portion 14a at one end, and a plug for connecting the other end portion to the inspection opening 39 in an internally fitted state. By providing the insertion portion 45b and connecting the bath passage 11 and the inspection opening 39 via the supply pipe 45, water as the inspection fluid can be supplied from the bath passage 11 to the high-temperature supply header HD1. It is configured as follows.

  That is, when water as the inspection fluid is supplied from the bathway 11, the check valve 43 that is in the state shown in FIG. 6 (a) has its water pressure as shown in FIG. In response to the expansion, the diameter of the flow hole 43a expands, allowing water to flow only from the inspection opening 39 into the high-temperature supply header HD1, and inspecting from within the supply header HD1. It is comprised so that the flow of water to the opening 39 for an operation | movement may be blocked | prevented.

  A valve seat 33a is provided at an end of the heat source side insertion portion 33 on the valve slide joint main body 32 side, and a switching valve 46 is constituted by a valve body 46a that can contact the valve seat 33a. The valve body 46a is provided with a hollow operation cylinder 46b and an operation part 46c provided at the end of the operation cylinder 46b, and the valve body 46a is integrally formed of a heat-resistant synthetic resin and is used for valve sliding. The joint body 32 is slidably movable along the axis L of the joint body 32, and is attached so as to be rotatable about the axis along the sliding direction, that is, around the axis L. The valve body 46a is sealed with an O-ring 47. However, a sealing O-ring 48 is also attached to the operation cylinder 46b.

As shown in FIG. 5, the operation tube 46b is provided with Z-shaped guide grooves 49 that act as locked portions so as to face each other with the positions thereof being different by 180 degrees. As shown in FIG. 4, the spring pin 50, which is an example of a projecting body that acts as a locking portion with respect to the opposing guide groove 49, penetrates the opposing guide groove 49 to the valve slide joint body 32. It is attached.
The guide groove 49 includes a linear groove 49a along the axis L, a lower inclined groove 49b that functions as an inspection-side inclined guide portion communicating with the lower end of the linear groove 49a, and a lower inclined groove 49b. An upper inclined groove 49d having a lower engaging groove 49c communicating with each other and acting as a flow-side inclined guide portion communicating with the upper end of the linear groove 49a, and an upper engaging groove communicating with the upper inclined groove 49d 49e is also provided.

Then, by sliding the operating portion 46c downward, as shown in FIG. 2, the valve body 46a is separated from the valve seat 33a, and the spring pin 50 is positioned at the upper end of the linear groove 49a. 46 will be in the state corresponding to a heat-medium flowing state. Thereafter, by operating the operation portion 46c to the right, the switching valve 46 is slightly slid to the heat medium flow state side by the action of the upper inclined groove 49d, and the spring pin is placed in the upper locking groove 49e. 50 is located, the switching valve 46 is prevented from sliding to the inspection state side, and the flow side engagement state is established.
That is, the valve body 46 a of the switching valve 46 is separated from the valve seat 33 a of the heat source side insertion portion 33, and the heat source side insertion portion 33 and each terminal side opening 35, 37 are connected in communication, and the high temperature from the high temperature outgoing path 15. The hot water is switched to the heat medium flow state in which the hot water is supplied to each terminal device D through the terminal side openings 35 and 37 and the heat medium flow pipe 20.

In order to switch the switching valve 46 in the heat medium flow state to the inspection state, the operation portion 46c is rotated to the left to release the above-described flow side engagement state, and the operation portion 46c is moved upward. Slide to. Then, as shown in FIG. 3, the spring pin 50 is positioned at the lower end of the linear groove 49a, and the switching valve 46 is in a state corresponding to the inspection state. Thereafter, by turning the operating portion 46c to the left, the switching valve 46 is slightly slid to the inspection state side by the action of the downward inclined groove 49b, and the spring pin 50 is positioned in the downward locking groove 49c. Then, the switching valve 46 is prevented from sliding to the heat medium flow state side and is brought into the inspection side engagement state.
That is, the valve body 46a of the switching valve 46 contacts the valve seat 33a, the communication between the heat source side insertion portion 33 and each of the terminal side openings 35 and 37 is cut off, and the inspection pipe opening is provided from the supply pipe 45. The water as the inspection fluid supplied to 39 is switched to the inspection state supplied to each terminal D via the check valve 43, each terminal-side opening 35, 37, and the heat medium flow pipe 20. The

  In FIG. 3, in order to simultaneously indicate the state corresponding to the inspection state of the switching valve 46 and the inspection state, the spring pin 50 is positioned at the lower end of the linear groove 49a. Although the valve body 46a of the switching valve 46 is in contact with the valve seat 33a, actually, when the spring pin 50 is positioned at the lower end of the linear groove 49a, the valve body 46a is separated from the valve seat 33a. It will be located a little away.

With the above configuration, in the heating system, the heat source side insertion portion 33 of the high-temperature supply header HD1 is fitted and connected to the discharge port 15a of the high-temperature outgoing path 15, and the large-diameter forward is connected to the branch pipe 36 of the supply header HD1. The side heat medium flow pipe 20 is externally fitted, and the small-diameter forward heat medium flow pipe 20 is connected to the terminal side opening 35 of the other branch pipe 34 via the linear joint 40, and if necessary. A fastener F made of a metal material is externally fitted between the discharge port 15a and the heat source side insertion portion 33, between the branch pipe 34 and the linear joint 40, and the like.
And although explanation was omitted, the heat source side insertion portion 33 of the return header HD2 is fitted and connected to the return port 16a of the heat medium return path 16, and a large diameter return side heat is connected to the branch pipe 36 of the return header HD2. The medium flow pipe 21 is externally fitted, and the return-side heat medium flow pipe 21 with a small diameter is connected to the terminal side opening 35 of the other branch pipe 34 via the linear joint 40. If necessary, the fastener F Also fits outside.

  Accordingly, the hot hot water from the high temperature outgoing path 15 is divided into a plurality of parts by the high temperature supply header HD1 and supplied to each high temperature type terminal D via the outgoing side flow pipe 20, and each terminal D The hot water is supplied to the return header HD2 through the return side flow pipe 21, joined by the return header HD2, and returned to the makeup water tank T through the heat medium return path 16. .

Although the description is omitted, the same applies to the low temperature terminal side, and the low temperature supply header HD3 is connected to the discharge port 18a of the low temperature outgoing path 18, and the outgoing side heat is supplied to the terminal side opening of the supply header HD3. By connecting the medium flow pipe and connecting the return side heat medium flow pipe between the low temperature type terminal and the terminal side opening of the return header HD2, the low temperature hot water from the low temperature outgoing path 18 is used for low temperature. It is configured to be supplied from the supply header HD3 to the low temperature type terminal device, and the hot water from the low temperature type terminal device is returned to the makeup water tank T via the return header HD2 and the heat medium return path 16.
In this case, in the return header HD2, the sealing plug 42 inserted into the end opening 41 of the heat medium flow joint body 31 is removed, and the L side joint 51 shown in FIG. A flow pipe can be connected.

In this heating system, in order to perform an airtight inspection on the terminal D side after installing a high temperature type terminal D, the hot water supply / discharge port of the adapter 5a of the bathtub 5 is closed as shown in FIG. A stopper member 5d with a safety valve is attached, and in this embodiment, a supply pipe 45 is connected to the inspection opening 39 of the supply header HD1 for either one of the high-temperature supply header HD1 and the return header HD2 for inspection. The opening 39 is connected in communication with the water draining portion 14 a of the bath going path 11.
Then, both the switching valve 46 of the high temperature supply header HD1 and the switching valve 46 of the return header HD2 are switched to the heat medium flow state to open the safety valve of the plug member 5d and open the hot water solenoid valve 12a. Then, water is supplied from the hot water filling path 12 to the remedy system and the supply pipe 45 so that the remedy system and the supply pipe 45 are filled with water and air is vented.

Next, the safety valve of the plug member 5d is closed, the tank water supply passage 23 is opened, the heat medium circulation pump 22 is driven, and the heat medium flow pipe 20 for the high temperature side heat medium passage HR and the terminal unit D of the heat source unit C, When the set time elapses after the lower limit sensor 24b of the makeup water tank T enters the detection state, the water supply is stopped and the heat medium flow pipes 20 and 21 for the terminal device D are filled with water. At the same time, the air of the heat medium flow tubes 20 and 21 is removed. That is, the internal air of the heat medium flow tubes 20 and 21 is caused to flow out of the makeup water tank T through the high temperature side heat medium passage HR.
When the air venting is completed, both the switching valve 46 of the high temperature supply header HD1 and the switching valve 46 of the return header HD2 are switched to the inspection state, and the water from the bathway 11 is supplied for high temperature through the supply pipe 45. This is supplied to the header HD1, and the water pressure in the heat medium flow pipes 20 and 21 with respect to the terminal device D is increased by the water supply until the water pressure sensor 10a provided in the bath return path 10 reaches a set pressure.

Then, after pressurizing to the set pressure, the pressurization operation is stopped, and the water level sensor 10a of the bath return path 10 detects the presence or absence of the pressure drop or detects the speed of the pressure drop, thereby significantly reducing the pressure. If there is no sudden pressure drop, it is determined that the heat medium flow tubes 20 and 21 in the terminal D are in a good airtight state.
When this airtight inspection is completed, the supply pipe 45 is removed from the high-temperature supply header HD1 and, if necessary, is closed with a sealing plug or the like as indicated by a virtual line in FIG. Both the valve 46 and the switching valve 46 of the return header HD2 are switched to the heat medium flow state.

As for the airtight inspection on the low temperature type terminal side, the supply pipe 45 is connected to one of the inspection opening portions of the low temperature supply header HD3 and the return header HD2, and the others are the high temperature type terminals. The same as the airtight inspection on the container D side.
When the high temperature type terminal device D and the low temperature type terminal device are connected together, the supply pipe 45 is connected to the inspection opening 39 of the return header HD2, and the high temperature type terminal device D side is connected. And a low-temperature terminal can be tested at the same time.

[Another embodiment]
(1) In the previous embodiment, the operation groove 46b of the switching valve 46 is provided with the guide groove 49 as the locked portion, and the spring pin 50 as the locking portion is attached to the valve slide joint body 32 side. Although shown, the guide groove 49 and the spring pin 50 can be reversed.
That is, a guide groove is provided on the valve slide joint main body 32 side so that the guide groove functions as a locking portion, and a protruding body as a locked portion is provided on the operation cylinder 46b to engage with the guide groove. It can also be implemented.
In any case, the guide groove does not need to be a hole that penetrates the projecting body as in the previous embodiment, and may be, for example, a bottomed groove into which the projecting body is engaged, Various changes can be made to the specific configuration of the locked portion and the locking portion.

(2) In the previous embodiment, the example in which the lower inclined groove 49b that acts as the inspection-side inclined guide portion in a state of communicating with the lower end of the linear groove 49a has been shown, but the lower inclined groove 49b is eliminated. The lower locking groove 49c can be directly communicated with the lower end of the linear groove 49a.
Similarly, the upper inclined groove 49d acting as the flow-side inclined guide portion can be eliminated, and the upper locking groove 49e can be directly communicated with the upper end of the linear groove 49a, and the upper locking groove 49e can be eliminated. Can also be implemented.
That is, for holding the switching valve 46 in the heat medium flow state, for example, using a spring, the valve body 46a of the switch valve 46 is elastically biased toward the heat medium flow state side, or a holder provided separately. It is possible to adopt various specific configurations, such as maintaining the heat medium flow state by using.

(3) In the previous embodiment, as the check valve provided in the inspection opening 39, the check valve 43 made of an elastic body provided with the flow hole 43a is shown. However, for example, the check valve using a ball It can be implemented using check valves of various structures, such as check valves using the biasing force of springs.

(4) In the previous embodiment, in addition to the heat source device C for heating, a system in which a heating terminal D is connected to a hot water supply device provided with a general hot water supply device A, a bath remedy device B, etc. However, the present invention can also be implemented by connecting to a device including only the heat source unit C for heating. In that case, a supply pipe from the water supply is connected to the inspection opening 39 of each header HD1, HD2, HD3, and a pressure sensor is attached to the supply pipe or the like to perform an airtight inspection.
Moreover, about the heat-source equipment C for heating, it can also replace with an electric type and a petroleum-type heat source machine, and can implement.

Schematic diagram of the entire heating system Partial cutaway view of header Partial cutaway view of header Cross section of the main part of the switching valve Development view of main parts of switching valve Cross section of check valve Explanatory drawing of inspection fluid supply pipe

Explanation of symbols

3 Heat medium heating means 15a, 18a Discharge port 16a Return port 20, 21 Heat medium flow pipe 32 Joint body 33 Heat source machine side connection part 35, 37 Terminal side connection part 39 Inspection connection part 43 Check valve 45 Inspection fluid Supply pipe 46 Switching valve 46c Operation part 49 Locked part 49a Linear groove 49b Inspection-side inclined guide part 49d Flow-side inclined guide part 50 Projection body as locking part C Heat source machine D Terminal HD1, HD2 , HD3 Heat source joint HR, HL Heat medium passage L Axial axis along slide direction

Claims (2)

Heat source machine joint connected to the return port or the discharge port in the heat source machine having a heat medium passage from the return port of the heat medium circulatingly supplied to the terminal to the discharge port of the heat medium via the heat medium heating means Because
A heat source machine side connection part connected to the return port or the discharge port, a terminal side connection part to which a terminal-side heat medium flow pipe is connected, and a test connection part to which a test fluid supply pipe is connected Are provided to communicate with each other,
An inspection state in which communication between the heat source unit side connection unit and the terminal side connection unit is blocked, and a heat medium flow state in which the block is released and the heat source unit side connection unit and the terminal side connection unit communicate with each other. Is provided with a switching valve that can be switched by sliding.
A joint for a heat source machine provided with a check valve that allows the inspection fluid supplied from the supply pipe to flow in the inspection connecting portion and prevents the flow in the direction opposite to the flow direction. .   When the switching valve is in a position corresponding to the inspection state, the operation portion of the switching valve is rotated around an axis along the sliding direction, thereby being locked on the switching valve side. An inspection side engagement state in which the portion is engaged with a locking portion provided on the joint body side and the switching valve in the inspection state is prevented from sliding to the heat medium flow state side, and the switching valve The heat source machine joint according to claim 1, wherein the heat source machine joint is configured to be switchable to an engagement disengagement state in which sliding to the heat medium flow state side is allowed.

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