JP3667936B2 - Pressure cap fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat source device that circulates and supplies a heated heat medium to a radiator such as a floor heating panel or a fan convector, and more particularly to a structure for fixing a pressure cap protruding from a top plate of the heat source device.
[0002]
[Prior art]
This type of heat source machine has a water chamber in which a heat medium is stored between the inner and outer cylinders, a can body in which a combustion chamber is formed inside the water chamber, a burner that performs combustion, and the water A circulation pump that circulates the heat medium in the chamber to the radiator, a reserve tank for replenishing the heat medium, and the like are accommodated in the outer case, and a pressure cap is provided from the protrusion provided in the top plate of the outer case. Projected.
[0003]
The pressure cap has a cap-cylinder portion connected to the upper portion of the can through a metal pipe, and is connected to the reserve tank through a flexible hose.
[0004]
That is, the pressure cap is attached to the tip of a metal pipe connected to the can body, and protrudes from the projection of the top plate in a form supported by the rigidity of the metal pipe. Since a strong twisting force for opening the cap is applied to the tube portion, a fixing bracket is attached to the cylinder portion for reinforcement, and this fixing bracket is screw-fixed to, for example, a muffler portion in the machine.
[0005]
In addition, the pressure cap is fitted with a frustoconical rubber packing that expands in a funnel shape toward the bottom, sealing the gap between the protruding openings to ensure airtightness inside the machine, and for outdoor installation Sometimes the entire protrusion is covered with a pressure cap cover to prevent rain or water from entering the aircraft.
[0006]
[Problems to be solved by the invention]
By the way, the above-mentioned pressure cap mounting structure is costly because it requires extra parts such as a fixing bracket, and it is difficult to align the fixing bracket and the pressure cap, making it difficult to assemble. It was.
[0007]
Further, as described above, when the attached fixing metal fitting is screwed to the muffler portion, there is a drawback in that the steam in the can easily leaks from the screw fixing portion, which adversely affects airtightness in the machine.
[0008]
The present invention was made to eliminate the above-mentioned drawbacks, and by devising the shape of the packing used for attaching the pressure cap and eliminating the fixing bracket, the cost is reduced and the airtightness in the machine is improved. It aims at providing the fixation structure of the pressure cap which aimed at.
[0009]
[Means for Solving the Problems]
That is, in the present invention, a pressure cap fixing structure for projecting a pressure cap to a projecting opening formed on a top plate of a heat source machine and having a rising edge formed on the periphery, and a flange portion on the periphery of the opening A cylindrical packing having elasticity in which an insertion hole through which a cap receiving cylinder of the pressure cap is inserted and a pipe hole through which a thin pipe connected thereto is inserted are formed on the top surface portion; A pressure cap cover having a flange portion formed at the periphery of the opening, and the packing is fitted into a cap receiving cylinder of the pressure cap, and the cylinder portion of the packing is closely attached to the rising edge of the protruding port. And the flange portion is sandwiched between the flange portion of the pressure cap cover and the top plate and fixed to the top plate with screws.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.
[0011]
FIG. 1 is an external view of a heat source machine to which the present invention is applied, and FIG. 2 is an internal structural view thereof.
[0012]
1 includes a front panel 5 that can be attached and detached, a side panel 3, a top plate 4 at the top of the machine body, and a frame 2 at the bottom of the machine body. This is an outdoor installation type heat source device in which an exhaust top 19A and a pressure cap cover 26 are projected from the top plate 4.
[0013]
Next, the internal configuration of the heat source apparatus will be described with reference to FIG. 2. Reference numeral 1 denotes the above-described outer case, and a stainless steel can body 6, a can body 6 made of stainless steel, A muffler 7 connected to the upper portion, a circulation pump 8 installed at the lower portion of the can body 6 and the like are accommodated, and an oil vaporizing burner for heating the can body 6 is disposed on the other side of the outer case 1. A burner 9, a fuel pump 10 for supplying fuel to the burner 9, an oil leveler 11, a reserve tank 12 that is open to the atmosphere, and the like are accommodated.
[0014]
Reference numeral 13 denotes a support base mounted on the gantry 2. The can body 6 is placed and fixed on the upper surface of the support base 13 in an upright state, and the circulation pump 8 is accommodated in the internal space of the support base 13. Yes.
[0015]
The can body 6 has a vertically long cylindrical shape, and includes an inner cylinder 14, an outer cylinder 15, a plurality of smoke pipes 16 and the like. A combustion chamber 17 through which the combustion gas of the burner 9 flows is provided inside the inner cylinder 14. A water chamber 18 is formed between the inner cylinder 14 and the outer cylinder 15 to store water as a heat medium and circulating water such as ethylene glycol used as an antifreeze liquid. Further, the plurality of smoke pipes 16 are connected to the muffler 7 that passes through the water chamber 18 above the top of the inner cylinder 14 and communicates with the exhaust top 19A.
[0016]
Reference numeral 20 denotes a metal forward pipe connected to the upper portion of the can body 6, and the other end of the forward pipe 20 is connected to the inlet side of the circulation pump 8 via a flexible hose 23.
[0017]
In the above configuration, the high-temperature combustion gas generated in the combustion operation of the burner 9 exchanges heat with the heat medium in the water chamber 18 when passing through the combustion chamber 17 and the plurality of smoke pipes 16, and the exhaust gas is the muffler 7. The heat medium in the water chamber 18 that enters the exhaust top 19 </ b> A, is discharged to the outside, and is heated to a high temperature is driven by the circulation pump 8, and is drawn into the circulation pump through the forward piping 20 and further circulated. After flowing from the pump 8 through the circulation pipe 27 to an external radiator such as a floor heating panel or a fan convector, the heat is exchanged there and then returned to the water chamber 18 again. In this way, the heating medium is repeated by repeating the circulation of the heat medium.
[0018]
By the way, a pressure cap pipe 21 is connected to the upper portion of the can 6 corresponding to the top of the water chamber 18, and the reserve tank 12 is connected to the upper end of the pressure cap pipe 21 via a flexible thin pipe 25. A pressure cap 24 connected to the pipe is attached. The pressure cap 24 is covered with a pressure cap cover 26 on the outer periphery, and protrudes from a circular protrusion 22 formed in the top plate 4.
[0019]
The pressure cap 24 includes two valves (not shown) having different directions for outflow and inflow. When the circulating water expands due to the combustion operation and the pressure in the water chamber 18 and the outgoing pipe 20 increases. When the outflow valve is activated and the circulating water in the forward pipe 20 is discharged to the reserve tank 12 through the narrow pipe 25, and the pressure in the water chamber 18 and the forward pipe 20 is reduced, the inflow valve is discharged. Is activated to replenish the replenishment water in the reserve tank 12 into the water chamber 18 through the thin pipe 25 to adjust the water pressure of the can 6 to a constant level, and is also used as an inlet for replenishing the antifreeze liquid. Yes.
[0020]
Hereinafter, based on FIG. 3 and FIG. 4, one Embodiment of the fixing structure of the pressure cap 24 which is the characteristics of this invention is described.
[0021]
3 is a partially enlarged cross-sectional view showing attachment of the pressure cap 24, FIG. 4 is a view showing the shape of the packing 28 attached to the pressure cap 24, FIG. 4 (a) is a plan view, and FIG. 4 (b) is a longitudinal section. FIG.
[0022]
In FIG. 3, reference numeral 26 denotes a cylindrical pressure cap cover, and a flange portion 26A is formed on the periphery of the opening.
[0023]
A packing 28 attached to the pressure cap 24 is made of a highly airtight elastic material such as rubber, and is interposed between the pressure cap cover 26 and the top plate 4 to serve as a packing. At the same time, it serves as a seal for preventing the antifreeze liquid that has spilled from the inlet when the antifreeze is injected from entering the machine through the gap of the projecting opening 22.
[0024]
The packing 28 has a circular shape as shown in FIGS. 4 (a) and 4 (b), is provided with a step so that it can be fitted to the rising edge 4A at the periphery of the protruding port 22, and has a cylindrical shape. A flange portion 28A having an outer diameter substantially the same as that of the pressure cap cover 26 is formed on the periphery of the opening. In addition, screw fixing holes 32 are formed at three locations of the flange portion 28A.
[0025]
Further, in the center of the top surface portion of the cylindrical packing 28, an insertion hole 29 for fitting into the small diameter portion 33A of the cap receiving tube 33 of the pressure cap 24 is connected to the cap receiving tube 33 in the vicinity thereof. A pipe hole 30 through which the thin pipe 25 is inserted is formed, and the peripheral edges of the insertion hole 29 and the pipe hole 30 are both thick, and the inserted cap receiving cylinder 33 and the thin pipe 25 are used as a packing material. Due to this elasticity, the hole diameter is formed slightly small so that it tightly adheres to the inner wall of each hole 29, 30 and the airtightness after packing is secured.
[0026]
The packing 28 is fitted to the stepped portion of the narrow diameter portion 33A of the cap receiving cylinder 33, and the flange portion 28A of the packing 28 is disposed on the periphery of the projecting opening 22, and the pressure cap cover 26 is attached to the flange portion 28A. The flange portions 26A are overlapped and fixed to the top plate 4 with screws 31 from above.
[0027]
As described above, according to the present embodiment, by providing the packing 28 with a stepped portion and forming a cylindrical shape, the inner side of the base portion of the cylindrical portion of the packing 28 can be brought into close contact with the rising edge 4A of the protruding port 22, Furthermore, since the flange portion 28A is screw-fixed to the top plate 4 so as to be sandwiched between the flange portion 26A of the pressure cap cover 26 and the top plate 4, the degree of adhesion between the packing 28 and the top plate 4 becomes strong. As described above, even if a reinforcing metal fitting for reinforcement is not used, it can sufficiently withstand a strong twisting force when the pressure cap is opened. Further, by eliminating the need for the fixing bracket, the fixing structure can be simplified, and the screwing process to the muffler 7 as in the conventional structure can be eliminated, so that the airtightness in the machine is improved.
[0028]
【The invention's effect】
As described above, according to the present invention, the packing interposed between the pressure cap cover and the top plate has a cylindrical shape with a step, and the cylindrical portion is closely fitted to the rising edge of the projecting opening, and the flange Since the portion is sandwiched between the flange portions of the pressure cap cover and fixed to the top plate by screws, the degree of adhesion between the packing and the top plate becomes strong, and the pressure cap is securely fixed. As a result, it is possible to eliminate the need for reinforcing brackets as in the past, simplifying the structure and reducing costs, and eliminating the fixing brackets eliminates the screwing process to the muffler. And can prevent excessive stress from being applied to the muffler. In addition, since the adhesion between the packing and the cap receptacle is enhanced, the liquid tightness to the machine is improved.
[Brief description of the drawings]
FIG. 1 is an external view of a heat source machine to which the present invention is applied.
FIG. 2 is an internal structural diagram of the heat source machine.
FIG. 3 is a partial enlarged cross-sectional view of a heat source machine showing attachment of a pressure cap.
4A and 4B are diagrams showing the shape of a packing, in which FIG. 4A is a plan view and FIG. 4B is a longitudinal sectional view.
[Explanation of symbols]
4 Top plate 4A Rising edge 22 Protruding port 24 Pressure cap 25 Thin pipe 26 Pressure cap cover 26A Pressure cap cover flange portion 28 Packing 28A Packing flange portion 29 Insertion hole 30 Pipe hole 33 Cap receiving tube

Claims (1)

A pressure cap fixing structure for projecting a pressure cap to a projecting port formed on a top plate of a heat source machine and having a rising edge formed at the periphery,
A flange portion is formed at the periphery of the opening portion, and an insertion hole through which the cap receiving tube of the pressure cap is inserted and a pipe hole through which a narrow pipe connected thereto is inserted are formed on the top surface portion. It is composed of a cylindrical packing and a pressure cap cover with a flange formed on the periphery of the opening.
The packing is fitted into a receiving cylinder of the pressure cap, the cylindrical part of the packing is closely fitted to the rising edge of the projecting opening, and the flange part is connected to the flange part of the pressure cap cover and the top plate. A pressure cap fixing structure characterized in that it is sandwiched between two screws and fixed to the top plate.

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