JPH05288381A - Inspection cover fixing device for heat exchange unit - Google Patents

Abstract

PURPOSE:To improve a holding force of an inspection cover for closing an inspection port of a body case. CONSTITUTION:An inspection port in which a heat exchanger is telescoped is provided on the body case 12 of a heat exchange unit, and an inspection cover 20 for closing the port at a normal time is provided. A spongy sealer 21 for holding a sealed state is provided on a rear surface of the cover 20. A fixture 24 for fixing the cover 20 in a closed state is rotatably provided on the case 12, and an elastic member 26 is mounted on a rear surface side of the fixture 24. The member 26 is brought into pressure contact with a flange 20a of the cover 20 at a fixed position of the fixture 24 to press the cover 20 in a closing direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inspection lid fixing device of a heat exchange unit for fixing an inspection lid for closing an inspection opening for a heat exchanger in a heat exchange unit having a heat exchanger in a main body case. ..

[0002]

2. Description of the Related Art For example, a heat exchange unit used in an air conditioning and ventilation system for business use has a rectangular box-shaped main body case,
An air blower for supply and exhaust, a heat exchanger for exchanging heat between the exhaust and the supply, and the like are arranged. The heat exchange unit is provided, for example, in a ceiling back part of a building in a state where air supply and exhaust ducts are connected to both side surfaces of the main body case.

For maintenance of the heat exchange unit, the main body case is provided with a rectangular inspection port through which the heat exchanger and the like can be put in and taken out.
An inspection lid is provided for opening and closing this inspection port.
FIG. 9 shows a structure for fixing a conventional inspection lid to a main body case.

That is, the inspection lid 1 is formed in a rectangular plate shape having a flange portion 1a rising on the front surface side in the peripheral portion, and a heat-insulating sponge-like sealing material 2 is attached to the back surface thereof. On the other hand, around the inspection port 4 of the main body case 3, there are provided, for example, fixing fixtures 5 located in two places on the left and right sides and curved in a U shape. This fixing bracket 5
It is attached by a hinge 6 so as to be rotatable between a fixed position shown by a solid line in FIG. 9 and an open position shown by a chain double-dashed line.

Then, by rotating the fixing member 5 from the open position to the fixing position, the fixing member 5 locks the flange portion 1a of the inspection lid 1, and the main body case 3 and the fixing member 5 are connected. The inspection lid 1 is sandwiched between them so as to be in a fixed state. At this time, when the tip side portion of the fixing member 5 crosses over the flange portion 1a of the inspection lid 1, the fixing metal member 5 has a toggle action due to its shape and its spring property, and is held at the fixed position. ..

In this state, the sealing material 2 on the back surface of the inspection lid 1 is pressed against the peripheral portion of the inspection port 4 of the main body case 3, so that the air is not leaked from the main body case 3 during normal use. The mouth 4 is adapted to be closed. Further, when the inspection port 4 is opened during maintenance, the inspection cover 1 can be opened by unlocking the inspection cover 1 by rotating the fixing member 5 from the fixed position to the open position.

[0007]

By the way, when the inspection port 4 is closed, the sealing material 2 of the inspection lid 1 is elastically pressed against the peripheral portion of the inspection port 4 to seal the inside of the main body case 3 as described above. Although the state is maintained, when it is used for a long period of time, its elastic restoring force is deteriorated due to deterioration of the sealing material 2, and the sealing material 2 is crushed and cannot return to a flat state as shown in FIG. There is a situation that it will end up.

However, in the above-mentioned conventional fixing structure of the inspection lid 1 to the main body case 3, the holding power of the inspection lid 1 by the fixing metal fitting 5 is not so strong, and when the elastic restoring force of the sealing material 2 is reduced, As shown in FIG. 10, a gap may be formed between the flange portion 1a of the inspection lid 1 and the fixture 5, and the inspection lid 1 may rattle.

When rattling occurs in the inspection cover 1 as described above, noise may be generated due to vibration, and air may flow from the gap between the peripheral portion of the inspection port 4 and the inspection cover 1 (sealing material 2). However, there is a risk that the ventilation efficiency or the heat exchange efficiency will be deteriorated and that the inspection lid 1 may fall off in the final stage.

The present invention has been made in view of the above circumstances, and an object of the present invention is to improve the holding power of the inspection lid and, by extension, to prevent air leakage from the inspection port with certainty. It is to provide an inspection lid fixing device for the unit.

[0011]

According to a first aspect of the present invention, there is provided an inspection lid fixing device for a heat exchange unit for a heat exchange unit provided in a main body case in a heat exchange unit having a heat exchanger in the main body case. A device for fixing an inspection lid that closes the inspection opening, which is provided between a fixed position for locking an edge of the inspection lid and an open position for unlocking the inspection lid, which is provided in a peripheral portion of the inspection opening. The present invention is characterized in that it includes a fixture that can be rotated, and an elastic portion that is provided on the fixture and that presses the inspection lid in the closing direction by pressing against the inspection lid when the fixture is in the fixed position. (The invention of claim 1).

A second inspection lid fixing device for a heat exchange unit of the present invention closes an inspection port for a heat exchanger provided in the main body case in a heat exchange unit having a heat exchanger in the main body case. Is a device for fixing the inspection lid, which can be rotated between a fixed position provided around the inspection opening for locking the edge of the inspection lid and an open position for releasing the locking. A fixture and a toggle mechanism together with the fixture, and when the fixture is in the fixed position, presses the fixture in the closing direction of the inspection lid and fixes the fixture in the open position. And a toggle spring for holding the tool in its open position (invention of claim 2).

Further, in the inspection lid fixing device for the second heat exchange unit according to the present invention, it is more effective if the fixing member is provided with an escape hole for escaping the toggle spring (claim 3). invention).

[0014]

According to the inspection lid fixing device for the first heat exchange unit of the present invention, when the fixing tool is in the fixed position, the fixing tool locks the edge portion of the inspection lid to close the inspection lid. It is fixed, and the inspection lid is pressed in the closing direction by the elastic portion provided on the fixing tool. Therefore, the inspection lid always receives the pressing force of the elastic portion, the holding force of the inspection lid is improved, and the gap between the inspection lid and the inspection port is prevented from occurring.

According to the inspection lid fixing device for the second heat exchange unit of the present invention, when the fixing tool is located at the fixed position by the toggle spring that constitutes the toggle mechanism together with the fixing tool, the fixing tool is closed. Then, the inspection lid is pressed in the closing direction, and the inspection lid is pressed in the closing direction. Therefore, the holding force of the inspection lid is improved, and in turn, a gap is prevented from being formed between the inspection lid and the inspection port. Also, when the fixture is in the open position, the fixture is held in the open position, so that the fixture does not sway and hinder the work of the heat exchanger inspection and inspection lid. Opening and closing work becomes easier.

In this case, if an escape hole for escaping the toggle spring is provided in the fixing tool, the degree of freedom in designing the shape and mounting position of the toggle spring is improved, and a comparatively simple structure is sufficient. be able to.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (corresponding to claim 1) in which the present invention is applied to a heat exchange unit used in an air-conditioning ventilation system for business use will be described below with reference to FIGS.
First, FIG. 3 shows a state in which the heat exchange unit 11 is arranged behind the ceiling of a building. Although not shown in detail, the heat exchange unit 11 according to the present embodiment has two sets of air blowers for air supply and exhaust in a main body case 12 having a rectangular box shape.
In addition, a cross-flow type heat exchanger 13 (shown by a broken line) and the like are arranged, and in this case, they are suspended by four anchor bolts 14.

An exhaust duct 15 and an air supply duct 16 communicating with the room are connected to one side surface (right side in the drawing) of the heat exchange unit 11, and the other side surface (left side in the drawing) is connected to the side surface. The exhaust duct 17 and the intake duct 18 communicating with the outside are connected.

As a result, when the air blower is driven,
The air in the room is sucked in through the exhaust duct 15 and the heat exchanger 1
The air is exhausted from the exhaust duct 17 to the outside through the air conditioner 3, and the outdoor air is sucked from the air supply duct 18 and supplied to the room from the air supply duct 16 through the heat exchanger 13. At this time, heat is exchanged between both airs by passing through the heat exchanger 13.

At the center of the front face of the main body case 12 in FIG. 3, a rectangular inspection port 1 for taking in and out the heat exchanger 13 and inspecting the air blower at the time of maintenance is provided.
9 (only shown in FIG. 2) is provided. Along with this, an inspection lid 20 for opening and closing the inspection port 19 is attached to the main body case 12 so as to be rotatable at the upper side in this case.

As shown in FIGS. 1 and 2, the inspection lid 20 has a rectangular plate shape slightly larger than the inspection port 19 and has a flange portion 20a rising to the surface side at the peripheral portion thereof.
have. Further, a heat-insulating sponge-like sealing material 21 is attached to the entire back surface of the inspection lid 20. This inspection lid 20 has a hinge 2 at its upper side.
It is rotatably attached to the upper part of the inspection port 19 of the main body case 12 by 2. Therefore, the inspection port 19 is opened and closed by opening and closing the lower portion of the inspection lid 20 in the vertical direction.

The main body case 12 is for fixing the inspection cover 20 in a closed state by locking the lower left and right portions of the inspection cover 20 in a normal state, that is, when using the air-conditioning ventilator.
A pair of inspection lid fixing devices 23 are provided. Hereinafter, the fixing device 23 according to the present embodiment will be described with reference to FIGS. 1 and 2 showing the right side of them as a representative.

That is, at the lower right portion of the inspection port 19 of the main body case 12, there is provided a fixture 24 made of, for example, a metal plate material.
It is attached via a hinge 25. This fixture 24
Has a shape in which a horizontally long rectangular plate material is curved in a substantially U-shape as a whole, and the tip portion (left end side in the drawing) is further curved in the opposite direction. The fixture 24 can be rotated between a fixed position shown by a solid line in FIG. 2 and an open position shown by a chain double-dashed line.

An elastic member 26 as an elastic portion is attached to the back side of the fixture 14. The elastic member 26 is made of a leaf spring material having a width narrower than that of the fixing tool 24, and the base end portion of the elastic member 26 is attached to the tip end portion of the fixing tool 24 with the rivet 2.
It is fixed by 7 and has a shape in which the tip portion is curved toward the fixture 24 side. In this case, in the open position, the tip of the elastic member 16 is located away from the back surface of the fixture 24. The fixture 24 located on the left side in FIG. 3 has the same structure for left and right objects.

Thus, when the inspection lid 20 is closed, the fixing tool 24 is rotated from the open position to the fixing position, so that the fixing tool 24 locks the flange portion 20a of the inspection lid 20 and the main body. An inspection lid 20 is provided between the case 12 and the fixture 24.
It is designed to be in a fixed state with the sandwiched between. At this time, when the tip end side portion of the fixture 24 crosses the flange portion 20a of the inspection lid 20, the fixture 24 exhibits a toggle action and is held at the fixed position.

In this state, as shown in FIG. 2, the elastic member 26 made of a leaf spring is elastically deformed in the direction in which the elastic member 26 is pressed by the flange portion 20a and approaches the back surface of the fixture 24. The elastic member 26 is now attached to the inspection lid 2.
It comes to come into elastic contact with the flange portion 20a of 0,
Thus, the inspection lid 20 is pressed against the body case 12 side.
Therefore, the sealing material 21 on the back surface of the inspection lid 20 is attached to the inspection port 19
The inspection opening 19 is securely closed so as to prevent air leakage from the inside of the main body case 12 by being pressed against the peripheral portion of the main body case 12.

Further, when the inspection port 19 is opened during maintenance, if the fixture 24 is rotated from the fixed position to the open position, the inspection lid 20 is unlocked and the inspection lid 20 is opened.
Can be opened and closed. Since the elastic member 26 is configured to be smaller than the fixture 24, the elastic member 26 does not stick out of the fixture 24, and the operator does not use the fixture 24.
It is possible to prevent injuries caused by touching the elastic member 26 when rotating the.

In the meantime, when the inspection lid 20 is used for a long period of time, the elastic restoring force of the sealing material 21 is deteriorated due to the deterioration of the sealing material 21, and the sealing material 21 is crushed and cannot return to a flat state. There is such a situation.

However, according to the structure of the fixing device 23, the inspection lid 20 is always subjected to the pressing force regardless of the thickness of the sealing material 21 by the elastic member 26 provided on the fixing tool 24. Therefore, the conventional fixing bracket 5
Compared with the above, even if the holding force of the inspection lid 20 by the fixture 24 is improved and the elastic restoring force of the sealing material 21 is reduced, a gap may occur between the inspection lid 20 and the inspection port 19 in advance. To be prevented.

Therefore, according to the present embodiment, unlike the conventional one in which the rattling of the inspection lid 1 may cause vibration noise and air leakage, the holding force of the inspection lid 20 is increased. The air leakage from the inspection port 19 can be reliably prevented.

4 and 5 show a second embodiment of the present invention. The second embodiment also corresponds to claim 1, but differs from the first embodiment in the following points. That is, in the first embodiment, the elastic member 2 that is the elastic portion is used.
6 is a separate member from the fixture 24, but in this embodiment, the elastic portion 32 is formed by cutting and raising the fixture 31.
Are integrated.

With this structure, the holding force of the inspection lid 20 can be improved as in the first embodiment, and the air leakage from the inspection port 19 can be surely prevented. In addition, the effect that the number of parts can be reduced can be obtained.

Next, a third embodiment of the present invention (corresponding to claim 3) will be described with reference to FIGS. 6 to 8 showing the right side of the pair of inspection lid fixing devices 41 as a representative. .. still,
Portions common to the first embodiment, such as the main body case 12 and the inspection lid 20, are designated by the same reference numerals, detailed description thereof will be omitted, and only different points will be described below.

That is, at the lower right part of the inspection port 19 of the main body case 12, there is provided a fixture 42 made of, for example, a metal plate material.
It is attached via a hinge 43, and can be rotated between a fixed position shown in FIG. 7 and an open position shown in FIG. The fixing tool 42 is formed by bending a horizontally long rectangular plate material into a substantially U shape as a whole, and the tip portion (left end side in the drawing) of the plate material.
Has a shape that is further curved in the opposite direction.

In the present embodiment, as shown in FIG. 6, the fixing tool 42 is provided with a substantially rectangular escape hole 44 located at the central portion thereof, and a toggle spring 45 described later is provided. The cylindrical connecting portion 46, through which one end is inserted,
It is integrally provided so as to project inward of the escape hole 44.

On the other hand, the hinge 43 is provided on the main body case 12.
A mounting plate 47 made of a metal plate is mounted on the right side of. The mounting plate 47 is provided with a through hole 48 on the left side portion thereof, into which the other end of the toggle spring 45 is inserted. In this case, the toggle spring 45 is composed of a torsion coil spring, and as shown in FIG. 6, a spring wire is wound in a spiral shape at its intermediate portion, and further, both end portions are bent at right angles in mutually opposite directions. It is configured.

The toggle spring 45 is provided between the fixture 42 and the mounting plate 47 by inserting one end into the connecting portion 46 and the other end into the through hole 48. Thus, the toggle mechanism is configured.
That is, when the fixing tool 42 is located on the left side in the drawing from the neutral position, the spring force of the toggle spring 45 acts in the direction of rotating the fixing tool 42 to the fixing position side, and the fixing tool 42 is viewed from the neutral position. When it is located on the right side of, the toggle spring 45
The spring force is applied in the direction of rotating the fixing tool 42 to the open position side. Although not shown, the fixtures, toggle springs, etc. located on the left side of the inspection port 19 also have the same structure for left and right.

With this, when the inspection lid 20 is closed, the fixing tool 42 is rotated from the open position side to the fixing position side, so that the fixing tool 42 is attached to the flange of the inspection lid 20 as shown in FIG. The part 20a is locked, and the main body case 12 and the fixture 4
The inspection lid 20 is sandwiched between the two and the inspection lid 20 to be in a fixed state. Then, in this state, the toggle spring 45
Spring force acts on the fixture 42 in the direction of arrow A, and the fixture 42 presses against the inspection lid 20 to inspect the inspection lid 2.
0 is pressed against the body case 12 side. Therefore, the sealing material 21 on the back surface of the inspection lid 20 is pressed against the peripheral portion of the inspection opening 19, and the inspection opening 19 is reliably closed so that there is no air leakage from the inside of the main body case 12.

On the other hand, when the inspection port 19 is opened at the time of maintenance, if the fixture 42 is rotated from the fixed position side to the open position side, the inspection lid 20 is unlocked as shown in FIG. The inspection lid 20 can be opened and closed by the above. At this time, the escape hole 44 formed in the fixture 42 escapes the toggle spring 45. Then, in this state, the spring force of the toggle spring 45 acts on the fixture 42 in the direction of the arrow B, and the fixture 42 is held at the open position.

According to this embodiment, the fixture 42
Is pressed against the inspection lid 20 when it is in the fixed position, the inspection lid 20 always receives a pressing force regardless of the thickness of the sealing material 21 as in the first and second embodiments. The holding force of the inspection lid 20 by 24 is dramatically improved. Therefore, even if the elastic restoring force of the sealing material 21 is reduced, it is possible to prevent a gap from being formed between the inspection lid 20 and the inspection port 19, and thus to generate a vibration noise or the inspection port 1.
It is possible to reliably prevent air leakage from the 9.

Further, in the present embodiment, when the fixing tool 42 is located at the open position, the fixing tool 42 is reliably held at the open position by the spring force of the toggle spring 45, so that the fixing tool 42 is There is no wobbling and no obstruction, and the work of checking the heat exchanger 13 and the inspection lid 20
There is also an advantage that it becomes easier to open and close the work.

Further, especially in this embodiment, since the escape hole 44 for escaping the toggle spring 45 is formed in the fixture 42, the degree of freedom in designing the shape and the mounting position of the toggle spring 45 is improved, and by extension, The structure can be relatively simple.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings. For example, various modifications can be considered regarding the position and the number of fixtures, and the like, without departing from the scope of the invention. It can be implemented by appropriately changing it within the range.

[0044]

As is apparent from the above description, according to the present invention, the following excellent effects can be obtained.

That is, according to the inspection lid fixing device of the heat exchange unit of the first aspect, a fixing tool for locking the edge portion of the inspection lid is pressed against the inspection lid to push the inspection lid in the closing direction. Since the elastic portion to be attached is provided, it is possible to improve the holding force of the inspection lid, and it is possible to reliably prevent generation of vibration noise and air leakage from the inspection port.

According to the inspection lid fixing device of the heat exchange unit of the second aspect, the fixing member for locking the edge portion of the inspection lid, and the toggle mechanism together with the fixing member constitute the fixing position. Since it is provided with a toggle spring that presses the fixture in the closing direction of the inspection lid when it is located at the time of, and holds the fixture at the open position when the fixture is located at the open position,
In addition to the effect of improving the holding power of the inspection lid, it is possible to reliably prevent the generation of vibration noise and air leakage from the inspection port, and prevent the fixture from wobbling when in the open position. There is also an advantage that inspection work of the heat exchanger can be performed easily.

Further, according to the inspection lid fixing device of the heat exchange unit of claim 3, in claim 2, since the escape hole for escaping the toggle spring is provided in the fixture, the shape and the mounting position of the toggle spring are provided. The degree of freedom in designing with respect to the like is improved, and the structure can be relatively simple.

[Brief description of drawings]

FIG. 1 shows a first embodiment of the present invention, and is a perspective view from below of a main part.

FIG. 2 is a cross-sectional bottom view of the main part

FIG. 3 is a perspective view of a heat exchange unit.

FIG. 4 is a perspective view from the lower side of the main part showing the second embodiment of the present invention.

FIG. 5 is a cross-sectional bottom view of the main part

FIG. 6 is a perspective view from the lower side of the main part showing the third embodiment of the present invention.

FIG. 7 is a cross-sectional bottom view of the main part when the fixture is in the fixed position.

FIG. 8 is a cross-sectional bottom view of the main part when the fixture is in the open position.

FIG. 9 is a cross-sectional bottom view of essential parts showing a conventional example.

FIG. 10 is a cross-sectional bottom view of the main part when the sealing material is deteriorated.

[Explanation of symbols]

In the drawing, 11 is a heat exchange unit, 12 is a main body case, and 1
3 is a heat exchanger, 19 is an inspection port, 20 is an inspection lid, 20a is a flange portion, 21 is a sealing material, 22 is a hinge, 23, 4
1 is a fixing device, 24, 31, 42 are fixing tools, 25, 43
Is a hinge, 26 is an elastic member (elastic part), 32 is an elastic part, 4
4 is an escape hole, 45 is a toggle spring, and 47 is a mounting plate.

Claims (3)

[Claims] 1. A device for fixing an inspection lid that closes an inspection opening for a heat exchanger provided in the main body case in a heat exchange unit having a heat exchanger in the main body case, the periphery of the inspection opening. A fixing member which is provided in a part and which can be rotated between a fixing position for locking the edge portion of the inspection lid and an open position for unlocking the locking part; An inspection lid fixing device for a heat exchange unit, comprising: an elastic portion that presses against the inspection lid at a certain time and presses the inspection lid in a closing direction. 2. A device for fixing an inspection lid for closing an inspection opening for a heat exchanger provided in the main body case in a heat exchange unit having a heat exchanger in the main body case, the periphery of the inspection opening. A fixture provided on a portion of the inspection lid, which is rotatable between a fixed position for locking the edge portion of the inspection lid and an open position for unlocking the locking portion, and a toggle mechanism is configured together with the fixture to form a toggle mechanism. A toggle spring that presses the fixture in the closing direction of the inspection lid when the fixture is in the fixed position and holds the fixture in the open position when the fixture is in the open position. Fixing device for the inspection lid of the heat exchange unit. 3. The inspection lid fixing device for a heat exchange unit according to claim 2, wherein the fixing member is provided with an escape hole for escaping the toggle spring.