JP2023018788A - Defatting device - Google Patents

Abstract

To provide a defatting device in which a volatile substance such as decomposed gas generated from a processing target is exhausted to the outside of a heating furnace as quickly as possible together with defatting gas.SOLUTION: A defatting device comprises: a heating furnace 1 in which a processing target W is housed; a heater 2 that heats the heating furnace 1; a gas supply port 3a that supplies defatting gas from the outside into the heating furnace 1 and a gas exhaust port 4a that exhausts a volatile substance detached from the processing target W to the outside together with the defatting gas; and a fan 5 that circulates the defatting gas inside the heating furnace 1. While the gas exhaust port 4a is open on a gas circulation route formed inside the heating furnace 1 by the fan 5, the gas supply port 3a is open outside the gas circulation route.SELECTED DRAWING: Figure 3

Description

TECHNICAL FIELD The present invention relates to a degreasing apparatus for degreasing an object to be treated such as a ceramic material.

As shown in Patent Document 1, this type of degreasing apparatus heats an object to be treated in the inside of a heating furnace, and the cracked gas or the like released from the object to be treated is circulated in the heating furnace by means of a fan. It is discharged to the outside together with the degreasing gas. For this purpose, the heating furnace is provided with a gas supply port for supplying fresh degreasing gas and a gas discharge port for discharging the degreasing gas containing decomposition gas and the like to the outside.

JP-A-11-43704

However, in the conventional degreasing apparatus, effective discharge of the degreasing gas containing the cracked gas has not been studied. The problem of hindering the proper degreasing process may arise.

SUMMARY OF THE INVENTION The present invention has been made to find such problems and to solve them. It is designed to

That is, the degreasing apparatus according to the present invention comprises a heating furnace in which an object to be treated is accommodated, a heater for heating the heating furnace, a gas supply port for supplying a degreasing gas from the outside into the heating furnace, and A gas outlet for discharging detached volatile substances together with the degreasing gas to the outside, and a fan for circulating the degreasing gas in the heating furnace, wherein the gas outlet is a gas circulation path formed in the heating furnace by the fan. The gas supply port is open upward, and the gas supply port is open to the outside of the gas circulation path.

According to the above configuration, volatile substances such as the decomposition gas generated from the object to be treated can be discharged to the outside of the heating furnace as quickly as possible together with the degreasing gas, so that more effective degreasing can be performed. Become.

1 is an overall schematic diagram of a degreasing device according to an embodiment of the present invention; FIG. It is a schematic perspective view which shows the internal structure of the heating furnace in the same embodiment. It is a schematic plan view showing the internal structure when the ceiling surface of the heating furnace in the same embodiment is removed, and is an explanatory diagram for explaining the flow of degreasing gas in the heating furnace when viewed from above. FIG. 4 is a cross-sectional view taken along the line AA in FIG. 3, and is an explanatory view for explaining the flow of degreasing gas in the pre-chamber and the heating blower chamber when viewed from the front. The front view which shows the 2nd partition and opening adjustment mechanism of the degreasing apparatus in other embodiment of this invention.

An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a degreasing apparatus 100 according to the present embodiment includes a heating furnace 1 in which an object W to be processed is accommodated, a heater 2 for heating the heating furnace 1, and a degreasing gas supplied to the heating furnace 1. a gas supply pipe 3 for discharging, a gas discharge pipe 4 for discharging volatile decomposition gas and the like separated from the object W to be treated together with the degreasing gas to the outside of the heating furnace 1, and a fan 5 for circulating the degreasing gas within the heating furnace 1. is provided.
The heating furnace 1, which is a feature of the degreasing apparatus 100, will be described in detail below.

As shown in FIG. 2 and the like, the heating furnace 1 is, for example, made of metal and has a substantially rectangular parallelepiped shape. An opening/closing door 11 (shown in FIG. 3) for taking in and out W is provided on the back wall facing the opening/closing door 11. A safety lid 12 (shown in FIG. 3) is opened when the furnace pressure rises abnormally. 3) are provided respectively.
A gas supply port 3a to which the gas supply pipe 3 is connected and a gas discharge port 4a to which the gas discharge pipe 4 is connected are provided in the safety lid 12 in this embodiment.

For convenience of explanation, the horizontal direction orthogonal to the opening/closing door 11 and the safety lid 12 is hereinafter referred to as the depth direction, the opening/closing door 11 side is referred to as the front side, and the safety door side is referred to as the depth side. A horizontal direction orthogonal to the depth direction is called a left-right direction, and a vertical direction is called an up-down direction.
The heating furnace 1 in this embodiment is partitioned into a main chamber 1a and a sub chamber 1b by a first partition wall 8. As shown in FIG.

The first partition wall 8 is provided at the left rear corner of the heating furnace 1, and is above the bottom surface of the heating furnace 1 and extends forward from the inner surface of the safety lid 12. The bottom wall 81 is composed of a left side wall 82, a right side wall 83 and a front wall 84 extending from the left and right sides and the front side of the bottom wall 81 to the ceiling surface of the heating furnace 1, respectively.

The space surrounded by the ceiling surface of the heating furnace 1, the inner surface of the safety lid 12, and the first partition wall 8 is the auxiliary chamber 1b, and the other space in the heating furnace 1 is the main chamber 1a. be.

In this embodiment, the upper end of the left side wall 82 of the first partition 8 is slightly separated from the ceiling surface of the heating furnace 1 so that the degreasing gas can flow through the communication port 8a which is the gap between them.
Next, the main chamber 1a and sub-chamber 1b will be described in further detail.

The main chamber 1a is partitioned into two chambers, a heating air blowing chamber 1a1 on the back side and a processing chamber 1a2 on the front side, by a second partition wall 9 extending laterally. A heater 2 and a fan 5 are arranged in the heating air blowing chamber 1a1, and an object W to be processed is accommodated in the processing chamber 1a2.

Between the left and right edges of the second partition wall 9 and the corresponding left and right inner surfaces of the heating furnace 1, gaps are formed. circulating ports 9a and 9b for circulating the
Next, the heating air blowing chamber 1a1 will be described in detail.

In this heating air blowing chamber 1a1, the heater 2 is arranged on one end side (specifically, the left side), and the fan 5 is arranged on the other end side (specifically, the right side).

The heater 2 is, for example, a rod-shaped one extending vertically, and in this embodiment, a plurality of heaters are arranged intermittently. Further, the auxiliary chamber 1b is provided on the far side of the heater arrangement area so as to be adjacent to it with the first partition wall 8 interposed therebetween.
The fan 5 is, for example, of an axial flow type that sucks gas from its center and discharges gas from its periphery.

Further, an upright partition plate 6 extending in the depth direction is provided between the fan 5 and the heater arrangement area of the heating air blowing chamber 1a1. A gap 6a is formed between the upper end of the standing partition plate 6 and the ceiling surface of the heating furnace.

Thus, in this embodiment, the gas discharge port 4a is opened to the heating air blowing chamber 1a1 in the main chamber 1a. More specifically, it is the lower left portion of the safety lid 12, the lower side of the auxiliary chamber 1b and the far side of the heater arrangement area.
On the other hand, the gas supply port 3a is opened to the sub-chamber 1b, and more specifically, is formed in a safety lid 12 below the sub-chamber 1b.
Next, the flow of the degreasing gas within the heating furnace 1 configured in this manner will be described.

As shown in FIGS. 3 and 4, the new degreasing gas (indicated by the dotted line) supplied from the gas supply port 3a into the heating furnace 1 is warmed by the residual heat of the adjacent heater 2 while ascending the pre-chamber 1b. , the degreasing gas (indicated by the solid line) that has flowed into the heating air blowing chamber 1a1 of the main chamber 1a from the communication port 8a provided on the upper side of the first partition 8 and has already been supplied and circulated in the heating furnace 1; merge.

The combined degreasing gas is sucked into the fan 5 through the gap 6a of the partition plate 6 and blown out from the right side of the fan 5. As shown in FIG. Then, it enters the processing chamber 1a2 from the first circulation port 9a provided on the right end side of the second partition 9, and is sprayed onto the processing object W. As shown in FIG. Therefore, the decomposition gas or the like volatilized from the object W to be processed is involved (degreased), and returned to the heating air blowing chamber 1a1 through the second circulation port 9b provided on the left end side of the second partition wall 9.

A considerable amount of the degreasing gas blown onto the object W to be processed is discharged from the gas discharge port 4a provided in the lower part of the heating air blowing chamber 1a1 together with the cracked gas and the like, while the remainder is discharged by the vertically extending heater 2. While being warmed, it rises in the heating air blowing chamber 1a1, joins with the new degreasing gas that has flowed in from the communication port 8a of the first partition 8 (downstream of the gas discharge port 4a), and circulates as described above.

Thus, according to the degreasing apparatus 100 according to the present embodiment configured as described above, a circulation path for the degreasing gas containing the decomposition gas generated from the object W to be processed is formed in the main chamber 1a of the heating furnace 1, Since the gas discharge port 4a is opened in the main chamber 1a in which the circulation path is formed, the decomposed gas is reliably discharged to the outside together with the degreasing gas. Therefore, it is possible to reduce the repeated blowing of the decomposed gas that once detached from the processing object W to the processing object W, and to perform the efficient degreasing treatment.

Further, the gas supply port 3a is formed at a position separated from the internal gas circulation path by the first partition wall 8, and the new degreasing gas flowing into the heating furnace 1 from the gas supply port 3a is the object to be treated. Since the new degreasing gas is mixed with the circulating degreasing gas at the communication port 8a on the downstream side of the gas outlet 4a provided on the downstream side of the main chamber 1a in which the article W is accommodated, the new degreasing gas can It is possible to prevent the gas from being discharged from the gas discharge port 4a before reaching the object W.

Therefore, almost all of the new degreasing gas is reliably sprayed onto the object W to be processed, and this point can also contribute to preventing repeated spraying of the cracked gas onto the object W to be processed.

Further, the new degreasing gas enters the heating furnace 1 through the gas supply port 3a provided in the lower part of the auxiliary chamber 1b, and flows into the main chamber 1a through the communication port 8a provided in the upper part of the auxiliary chamber 1b. Then, it is warmed by the residual heat of the heater 2. In this way, the new degreasing gas is brought as close as possible to the temperature of the degreasing gas circulating in the main chamber 1a before it flows into the main chamber 1a. does not cause any decline.

Further, in the heating air blowing chamber 1a1, the partition plate is provided between the heater 2 and the fan 5, and the degreasing gas flows from the gap 6a provided above the partition plate, so that the heating furnace is reliably heated by the heater 2. Only the degreasing gas that has reached the upper portion is sent to the fan 5, and in this respect as well, the temperature drop of the circulating degreasing gas can be prevented.
In this way, the entire heater 2 is used without waste for heating the new degreasing gas and the circulating degreasing gas, so efficient heating can be realized.

On the other hand, focusing on the degreasing gas flowing into the processing chamber 1a2 in which the object W to be processed is accommodated, the degreasing gas enters from the first circulation port 9a extending vertically to one end (left end) of the processing chamber 1a2. Then, the degreasing gas flows evenly throughout the entire processing chamber 1a2, so that the degreasing gas flows more evenly throughout the processing chamber 1a2. Uniform heating and degreasing can be achieved.
It should be noted that the present invention is not limited to the above embodiments.

For example, as shown in FIG. 5, if an opening adjustment mechanism 10 is provided to change the opening area or opening shape of each of the circulation ports 9a and 9b, the gas circulation mode in the processing chamber can be adjusted according to the shape and size of the object to be processed. For example, it is possible to suppress unnecessary circulation of decomposed gas in the processing chamber, prevent degreasing gas from reattaching to the processing object, and more efficiently and reliably. degreasing can be performed. In addition, since it is possible to prevent the concentration of the degreasing gas in the processing chamber from increasing, it is possible to avoid an unexpected situation such as an explosion and improve safety.

The opening adjusting mechanism 10 shown in the figure is constructed by attaching adjusting plates 101 which are configured to move forward and backward to the left and right by using, for example, long holes 10a and setscrews 10b, respectively, at both left and right ends of the second partition wall 9. It is what I did. The width of each of the circulation ports 9a and 9b can be adjusted by sliding the adjustment plate 101 left and right.

In addition, for example, by arranging a plurality of these adjusting plates vertically and moving one of the adjusting plates back and forth, the upper width of the circulation port is larger than the lower width, or the intermediate width is larger than the upper and lower width. Thus, the shape of the circulation port may be changed, or the area and shape of the circulation port may be changed by rotatably attaching the adjusting plate to the second partition wall.

Further, the shape of the auxiliary chamber 1b and the main chamber 1a, the types of the fan 5 and the heater 2, etc. are not limited to those of the above-described embodiment, and various modifications are possible. You can change it.

Although the communication port and the gap are formed between the upper end of the first partition wall or the partition plate and the ceiling surface, it is preferable that they are located in the upper part of the heating furnace. It may be formed by providing a through hole or the like.
In addition, the present invention may be modified without departing from the gist of the invention, such as by combining a part of each modified example described above.
The features of the degreasing apparatus 100 described above can be summarized as follows.

(1) This degreasing apparatus 100 includes a heating furnace 1 in which a workpiece W to be processed is housed, a heater 2 for heating the heating furnace 1, a gas supply port 3a for supplying a degreasing gas from the outside into the heating furnace 1, and A gas outlet 4a for discharging volatile substances separated from the object W to the outside together with the degreasing gas, and a fan 5 for circulating the degreasing gas in the heating furnace 1. The gas outlet 4a is operated by the fan 5. It is characterized in that it opens onto the gas circulation path formed in the heating furnace 1, and the gas supply port 3a opens outside the gas circulation path.

(2) More specifically, the degreasing apparatus 100 further includes a first partition 8 partitioning the heating furnace 1 so that gas can flow therethrough. 1a is provided with the fan 5 and the gas discharge port 4a is open, and the auxiliary chamber 1b, which is the other chamber partitioned by the first partition 8, is open with the gas supply port 3a. characterized by

With the above configuration, the gas discharge port 4a opens onto the circulation path of the degreasing gas containing the decomposition gas generated from the object W to be processed, while the gas supply port 3a is connected to the gas circulation path. Since it is open to the outside of the path, not only is it possible to prevent the new degreasing gas from being directly discharged from the gas discharge port 4a, but also the cracked gas contained in the circulating degreasing gas is reliably discharged to the outside. Therefore, it is possible to reduce the repeated blowing of the cracked gas once detached from the processing object W to the processing object W, so that efficient degreasing can be performed.

(3) If the heater 2 is arranged in the main chamber 1a and the first partition 8 is arranged so as to be adjacent to the area where the heater 2 is arranged, the first partition 8 is formed. Since the new degreasing gas in the pre-chamber 1b can be efficiently heated using the residual heat of the existing heater 2, a new heating means can be provided to prevent an unexpected temperature drop caused by the mixture of the low-temperature new degreasing gas. can be prevented with a simple configuration.

(4) The gas supply port 3a is opened in the lower part of the sub-chamber 1b, and a communication port 8a is formed above the first partition wall 8 for communicating the main chamber 1a and the sub-chamber 1b. For example, the new degreasing gas flows from the lower part of the auxiliary chamber 1b to the communication port 8a, so that the new degreasing gas can be reliably warmed before being mixed with the degreasing gas circulating in the heating furnace 1.

(5) In order to heat and degrease the object W to be treated more uniformly, a second partition wall 9 is further provided for partitioning the main chamber 1a so that gas can flow therethrough, and the main chamber 1a is partitioned by the second partition wall 9. The fan 5 and the heater 2 are arranged in the heated air-blowing chamber 1a1, which is one of the chambers in which the heating air-blowing chamber 1a1 is provided. The second partition is discharged from the circulation ports 9a and 9b into the processing chamber 1a2, which is the other chamber, and is returned to the heated air blow chamber 1a1 through the second circulation ports 9a and 9b provided on the other end side of the second partition. is preferably configured.
(6) Particularly preferably, the heater 2 is arranged upstream of the fan 5 in the heating air blowing chamber 1a1.
(7) In order to efficiently discharge the degreasing gas containing the cracked gas, the gas discharge port 4a should be opened upstream of the fan 5 in the heating air blowing chamber 1a1.

(8) By providing an opening adjustment mechanism for changing the opening area or opening shape of each of the circulation ports 9a and 9b, the gas circulation mode in the processing chamber 1a2 can be changed according to the object W to be processed. A more efficient and reliable degreasing process can be performed according to the shape, size, and material of the object W.

DESCRIPTION OF SYMBOLS 100... Degreasing apparatus W... Object 1... Heating furnace 2... Heater 3a... Gas supply port 4a... Gas discharge port 5... Fan 8... First partition 1a Main chamber 1b Sub chamber 8a Communication port 9 Second partition wall 1a1 Heating air blowing chamber 1a2 Processing chamber 9a First circulation port 9b Second circulation port 10 ... opening adjustment mechanism

Claims (8)

a heating furnace in which the object to be processed is accommodated;
a heater for heating the heating furnace;
a gas supply port for externally supplying degreasing gas into the heating furnace and a gas discharge port for discharging volatile substances separated from the object to be treated together with the degreasing gas;
and a fan for circulating the degreasing gas in the heating furnace,
The gas outlet opens onto a gas circulation path formed in the heating furnace by the fan,
The degreasing apparatus, wherein the gas supply port opens outside the gas circulation path. Further comprising a first partition partitioning the heating furnace so that gas can flow,
The fan is arranged in a main room, which is one of the rooms partitioned by the first partition, and the gas discharge port is open,
2. The degreasing apparatus according to claim 1, wherein said gas supply port opens into an auxiliary chamber which is the other chamber partitioned by said first partition. 3. The degreasing apparatus according to claim 2, wherein the heater is arranged in the main chamber, and the first partition wall is arranged so as to be adjacent to the area where the heater is arranged. 4. A degreasing apparatus according to claim 2 or 3, wherein said gas supply port is open to the lower part of said sub-chamber, and a communication port is formed above said first partition wall for communicating said main chamber and said sub-chamber. . further comprising a second partition partitioning the main chamber so as to permit gas flow,
The fan and the heater are arranged in a heating air blowing chamber, which is one of the main chambers partitioned by the second partition,
The degreasing gas heated in the heated air blowing chamber is discharged from the first circulation port provided on one end side of the second partition into the processing chamber, which is the other chamber, and is provided on the other end side of the second partition. 5. The degreasing apparatus according to claim 2, wherein said second partition wall is constructed so as to return from said second circulation port to said heating air blowing chamber. 6. The degreasing apparatus according to claim 5, wherein the heater is arranged upstream of the fan in the heating air blowing chamber. 7. A degreasing apparatus according to claim 5, wherein said gas exhaust port opens upstream of a fan in said heat blowing chamber. 8. The heating air blowing chamber according to any one of claims 5 to 7, further comprising an opening adjusting mechanism for changing the opening area or opening shape of at least one of said circulation ports.

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