JP5448437B2 - Fluid observation container - Google Patents

Description

  The present invention relates to a fluid observation container for allowing a fluid to flow into an internally observable container body and observing the flow state of the fluid. More specifically, the container body can be formed in a small size, and the container body The present invention relates to a fluid observation container that can easily suppress a temperature change of the fluid by reducing heat transfer between the fluid flowing in and the container body.

  For example, in the production of fine particles such as metal oxides, there is a method of mixing and reacting high-temperature and high-pressure water such as a supercritical state and an aqueous metal salt solution having a temperature lower than the critical temperature of water (for example, Patent Documents). 1). Observing how the two kinds of fluids are mixed and reacted and how the fluid is flowing is an extremely important factor in constructing a new process.

  Conventionally, as a fluid observation container for observing the state of these fluids, a container body provided with an observation chamber open at both ends, a flow path forming member made of a transparent material housed in the observation chamber, and an observation A pair of transparent material lid members that respectively cover the open surfaces at both ends of the chamber and a pressing member that has a window portion and seals the observation chamber in a tightly sealed manner has been proposed (for example, (See Patent Document 2, hereinafter referred to as prior art).

  The container body includes a plurality of guide channels that communicate with the observation chamber, and the channel formation member includes an observation channel that communicates the guide channels with each other. . The fluid sent from one guide channel passes through the observation channel of the channel forming member arranged in the observation chamber, is sent out from the other guide channel, and is in a state of flowing through this observation channel. It is observed from the outside through the window of the lid member.

  Note that the fluid that flows into the observation chamber of the above-described prior art may be a high-temperature and high-pressure fluid such as a supercritical fluid or a subcritical fluid as described above. For this reason, the container body, the flow path forming member, the lid member, and the like need to have heat resistance and strength that can withstand the temperature and pressure of the fluid. For example, the container body is formed of a metal material or the like, The flow path forming member and the lid member are formed of sapphire or the like.

Japanese Patent No. 3663408 Japanese Patent Laying-Open No. 2005-189132

  In the above prior art, in order to maintain the tightness of the observation chamber, it is necessary to firmly press the lid member against the fluid pressure by the pressing member. For this reason, the holding member is securely screwed into a mounting hole larger than the lid member formed on the container main body, and the container main body is provided with the observation chamber so that the holding member can be fixed. It is formed into a much larger block body. As a result, while the fluid flowing into the observation chamber passes through the guide channel, the amount of heat it holds is rapidly lost by the container body, causing a problem that the supercritical state cannot be maintained, for example. . In order to solve this, it is necessary to heat the container body, but since the container body is large, a large amount of heat is required for heating.

  On the other hand, as in the case of the metal oxide fine particle production, a high-temperature high-pressure water such as a supercritical state and a metal salt aqueous solution maintained at a temperature lower than the critical temperature of water are mixed into the observation chamber. In the case of reaction, while this low-temperature aqueous solution passes through the guide channel, it is heated through the container body by the retained heat of the high-temperature and high-pressure water and becomes higher than the supercritical temperature and mixed with the supercritical water. As a result, there is a problem that the desired fine particle formation reaction cannot be caused and the reaction efficiency is remarkably lowered.

  The technical problem of the present invention is to solve the above-mentioned problems, the container body can be formed in a small size, the heat transfer between the fluid flowing into the container body and the container body is reduced, and the temperature change of this fluid An object of the present invention is to provide a fluid observation container that can easily suppress the above.

In order to solve the above-described problems, the present invention is described as follows, for example, based on FIGS. 1 to 8 showing an embodiment of the present invention.
That is, the present invention relates to a fluid observation container, which is made of a cylindrical container body (2) having an observation chamber (3) open at both ends, and a transparent material housed in the observation chamber (3). A flow path forming member (9), a pair of transparent material lid members (11) for covering the open surfaces of both ends of the observation chamber (3) in a coherent manner, and a window portion (14), the lid member ( 11) a pair of holding members (13) for pressing the container body (2) toward the container body, the container body (2) comprising a cylindrical peripheral wall (2a) surrounding the observation chamber (3) and its cylinder A plurality of guide passages (5) that penetrate through the peripheral wall (2a) and communicate with the observation chamber (3), respectively, and the passage formation member (9) includes the guide passages ( 5) An observation channel (10) communicating with each other is provided, and the holding member (13) is provided on both sides of the container body (2) with the observation chamber (3) and the lid member (11) interposed therebetween. These presser members (13) are arranged with each other by fixing means (15). By fixing so as to press the close direction, the outer circumference of the by the pressing force above the lid member (11) fixed to the hermetically-like into the cylindrical peripheral wall (2a), said cylindrical wall (2a) A flow pipe (4) is projected on the surface, the guide flow path (5) is formed inside the flow pipe (4), and at least one of the surroundings of the guide flow path (5) The temperature adjusting means (18) is provided at a position between the pressing members (13) .

  The holding member is disposed on both sides of the container body, and is pressed by the fixing means so as to sandwich the lid member and the observation chamber. Therefore, the lid member is firmly pressed to the container body side by the holding member. The open surface of the observation chamber is reliably sealed by the lid member. At this time, since the above-mentioned pressing member is not fixed to the container main body, the container main body can be formed in a small size. Thereby, since the movement of the heat between the fluid flowing into the container body and the container body is reduced, the temperature change of the fluid due to the movement of the heat is suppressed.

  Although the container main body is formed in a small size, the pressing member does not need to be fixed to the container main body, and thus can be formed in a large size. As a result, the holding member is easily provided with a large window portion corresponding to the lid member, and the lid member is firmly pressed by the holding member.

  Since the container body is formed in a small size, the contact area between the holding member and the container body is small, and heat transfer between the container body and the holding member is small. Therefore, this pressing member may be in partial contact with the container body, for example, for the purpose of positioning the mounting position with respect to the container body. However, it is preferable that the pressing member is less in contact with the container body. For example, it is more preferable that the pressing member is not in contact with the cylindrical peripheral wall.

The guide channel is not limited to a specific shape as long as it penetrates the cylindrical peripheral wall . And projecting the flow pipe to the outer peripheral surface of the cylindrical wall of the upper SL, the case that to form the guide channel into the interior of the flow pipe, while maintaining the container body in small, for example, a diameter such as 1mm or less, Ru can be easily formed a guide channel of any cross-sectional area. Further, in this case, it is more preferable that the pressing member and at least one of the flow pipes are not in contact with each other because less heat is transferred between the flow pipe that is the peripheral wall of the guide flow path and the press member. .

The above pressing member, is between the cylindrical peripheral wall, can be arranged a heat insulating material, in this case, conduction and radiation, and prevents transmission of heat from the container body due to convection, Further preferred.

To distribute the hot fluid, such as supercritical water guide passage For example, it is possible to arrange the temperature control means comprising heating device around the guide passage. In addition, when a relatively low temperature fluid such as an aqueous solution lower than the critical temperature of water is circulated in the guide channel, a temperature adjusting means including a cooling device can be provided around the guide channel. These temperature adjustment means can suppress the temperature change of the fluid even better.

  The flow path forming member and the lid member may be made of a transparent material and have heat resistance and strength according to the fluid to be circulated. For example, any material such as sapphire, diamond, synthetic quartz, or heat resistant glass is used. It can be used alone or in combination, and is not limited to a specific transparent material. The flow path forming member and the lid member can be integrally formed, and in this case, the number of parts can be reduced, which is preferable. On the other hand, when the flow path forming member and the lid member are formed separately, it is only necessary to replace this flow path forming member according to the desired flow path. It is preferable because it can be shared.

The flow path forming member only needs to include an observation flow path that communicates each of the above-described guide flow paths. The observation flow path may be an arbitrary shape such as a straight shape, a Y shape, a Y shape, or a T shape. It can be formed into a shape. The observation channel may be configured by a through-hole penetrating the channel forming member, or the channel forming member may be configured by a first member and a second member that are in close contact with each other. The observation channel may be formed in a groove shape on at least one of the contact surfaces of the first member and the second member.
A heater (16) may be attached to the pressing member (13). If the heater (16) is attached to the presser member (13), it is transferred to the presser member (13) via the flow path forming member (9), the lid member (11) and the cylindrical peripheral wall (2a) to the external space. The heat dissipated can be supplemented.

  Since the present invention is configured and operates as described above, the following effects can be obtained.

  (1) The lid member is firmly pressed against the container body by the holding member, so that the open surface of the observation chamber can be reliably sealed and the container body can be formed in a small size, so that the fluid flowing into the container body and the container The movement of heat between the main body can be reduced, and the temperature change of the fluid due to the movement of the heat can be easily suppressed.

  (2) Although the container main body is formed in a small size, the pressing member does not need to be fixed to the container main body and can be formed in a large size. Accordingly, a large window portion corresponding to the lid member can be easily provided on the pressing member, and the lid member can be firmly pressed by the pressing member and fixed to the cylindrical peripheral wall in a close-packed manner.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 4 show an embodiment of the present invention, FIG. 1 is a partially broken front view of a fluid observation container, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG. 4 is an enlarged sectional view in the vicinity of the sealing member.

  As shown in FIGS. 1 and 2, the fluid observation container (1) includes a cylindrical container body (2), and an observation chamber (3) having both ends opened in the container body (2). Is formed. On the cylindrical peripheral wall (2a) that surrounds the observation room (3), the flow pipes (4) protrude from three locations on the outer peripheral surface. Inside each flow pipe (4), a guide channel (5) that penetrates the cylindrical peripheral wall (2a) and communicates with the observation chamber (3) is formed. Of each guide channel (5), the first guide channel (5a) supplies high-temperature and high-pressure water (6) in the supercritical state or subcritical state into the observation chamber (3), and the second guide channel (5). (5b) supplies a raw material fluid (7) such as an aqueous metal salt solution into the observation chamber (3), and the third guide channel (5c) contains high-temperature and high-pressure water containing reaction products such as metal oxide fine particles. And the mixed fluid (8) of the raw material fluid are collected from the observation chamber (3).

  In the observation chamber (3), a flow path forming member (9) made of a transparent material such as sapphire is accommodated. The channel forming member (9) is formed with a Y-shaped observation channel (10) that communicates the guide channels (5). The observation channel (10) is formed of a through hole penetrating through the channel forming member (9).

  A lid member (11) made of a transparent material such as heat resistant glass is disposed on both sides of the container body (2) containing the flow path forming member (9) via an annular sealing member (12). In addition, the open surfaces at both ends of the observation chamber (3) are covered with the lid member (11) in a tightly sealed manner. A pair of pressing members (13) are arranged on both sides of the container body (2) so as to sandwich the lid member (11) and the observation chamber (3). Each holding member (13) has a window (14) opened so that the inside of the observation chamber (3) can be observed. The pressing member (13) is fixed so as to be pressed in directions close to each other by a fixing means (15) made of a bolt, whereby the lid member (11) is held by the pressing force by the container body (2 ) Side and the cover member (11) is fixed to the cylindrical peripheral wall (2a) in a close-packed manner.

  The pressing member (13) and the container body (2) are in partial contact with each other on the outer peripheral surface of the cylindrical peripheral wall (2a). However, in the present invention, a slight gap may be provided between the presser member (13) and the container body (2). In this case, the container body (2) and the presser are closed by blocking with an air layer. It is preferable because the movement of heat between the member (13) can be further suppressed. Part of the heat of the high-temperature high-pressure water (6) flowing into the observation chamber (3) from the first guide channel (5a) is the channel-forming member (9) and the lid member (11). ) And the cylindrical peripheral wall (2a), the heat is transmitted to the holding member (13) and is radiated to the external space. For this reason, the pressing member (13) is provided with a heater (16) for supplementing the heat radiation and a temperature sensor (17) for measuring the temperature of the pressing member (13).

  On the other hand, the pressing member (13) and the flow pipe (4) are arranged so as not to contact each other, and an air layer is formed between them. For this reason, the heat of the 1st guide flow path (5a) in which high temperature / high pressure water (6) distribute | circulates and becomes high temperature is insulated by air, and is hard to be transmitted to the holding member (13). A cooling water circulation device (18) is provided as a temperature adjusting means around the circulation pipe (4) forming the second guide channel (5b). By this cooling water circulation device (18), the temperature change of the raw material fluid (7) flowing through the second guide channel (5b) is suppressed, and the heat of the high-temperature high-pressure water (6) transmitted from the container body (2) is suppressed. The temperature rise is prevented.

  As shown in FIG. 3, the flow pipes (4) constituting the first guide flow path (5a) and the second guide flow path (5b) are respectively arranged in a sheath-like outer pipe (4a) and inside thereof. The inner pipe (4b) is formed into a thin flow pipe, and the tip of the inner pipe (4b) is inserted into the flow path forming member (9). As a result, the circumferential position of the flow path forming member (9) is positioned, and the high-temperature and high-pressure water (6) from the first guide flow path (5a) and the raw material fluid from the second guide flow path (5b) ( 7) are supplied to positions near the junction (19) formed in the observation channel (10), respectively, and are reliably guided to the junction (19).

  As shown in FIG. 4, the sealing member (12) is disposed between the container main body (2) and the lid member (11), and the observation chamber (12) is arranged by the sealing member (12). 3) The inside is sealed from the external space in a tightly sealed manner. Further, a heat insulating material (20) such as a mica plate is disposed between the container body (2) and the lid member (11), and the heat between the container body (2) and the lid member (11) is transferred. The movement is suppressed. In addition, this heat insulating material (20) also has the effect | action which absorbs the thermal expansion difference of a container main body (2) and a cover member (11). Further, as shown in FIG. 2, a similar heat insulating material (20) is disposed between the presser member (13) and the lid member (11), whereby the presser member (13) and the lid member (11) are arranged. The heat transfer between the two is suppressed and the difference in thermal expansion is absorbed.

Next, an observation procedure for producing metal oxide fine particles using the fluid observation apparatus will be described.
First, distilled water is boosted to a critical pressure by a pressurizing means and a heating means (not shown), and the temperature is raised to a critical temperature or higher, that is, 374 ° C. or higher to prepare supercritical high-temperature high-pressure water (6). The high-temperature and high-pressure water (6) is guided from the first guide channel (5a) into the observation chamber (3), and the observation channel (9) formed in the channel-forming member (9). To 10).

  On the other hand, after the raw material fluid (7) made of a metal salt aqueous solution is pressurized by a pressurizing means (not shown) and heated to a predetermined temperature as necessary, the above observation chamber ( 3) Guided into. At this time, the raw material fluid (7) is cooled to a temperature lower than the supercritical temperature, preferably high-temperature high-pressure water by the cooling water circulation device (18) disposed around the second guide channel (5b). It is maintained at a temperature lower than the solid precipitation temperature due to the reaction. For example, when the metal salt aqueous solution is an iron nitrate aqueous solution, it is maintained at a temperature lower than 150 ° C. The raw material fluid (7) maintained at this low temperature and guided into the observation chamber (3) flows into the observation channel (10) and joins with the high-temperature and high-pressure water (6).

  The raw material fluid (7) joined with the high-temperature high-pressure water (6) in the observation channel (10) is instantaneously heated above the subcritical temperature or the critical temperature by the amount of heat held by the high-temperature high-pressure water (6). Then, the reaction between the metal salt and the high-temperature high-pressure water is started. By this reaction, the metal salt is hydrolyzed / dehydrated or oxidized / reduced in the presence of an oxidizing agent / reducing agent to produce a reaction product such as a simple metal, a metal hydroxide or a metal oxide. The This reaction is maintained while the mixed fluid moves to the third guide channel (5c) side, and the flow condition of the mixed fluid and the situation in which the reaction product grows into the predetermined fine particles are described above. 9) and the lid member (11) through the window (14) formed in the pressing member (13). The reaction product that has grown to a predetermined size is discharged from the third guide channel (5c) together with the mixed fluid (8), and is instantaneously cooled to below the critical temperature by a cooling device (not shown). The reaction is stopped, whereby the fine particles of the reaction product are collected in a uniform particle shape.

In the above embodiment, the case where the observation flow path (10) is formed in a y shape has been described. However, in the present invention, the observation channel (10) may be formed in other shapes, and can be formed in an arbitrary shape as in the modification shown in FIG.
That is, in Modification 1 shown in FIG. 5A, the first guide channel (5a) and the second guide channel (5b) are arranged orthogonal to each other, and the third guide channel (5c) is provided. It is arranged on the extension of the first guide channel (5a).
In Modification 2 shown in FIG. 5B, the observation channel (10) is formed in a T shape.
In Modification 3 shown in FIG. 5C, the observation channel (10) is formed in a Y shape.
In Modification 4 shown in FIG. 5 (d), the tip (21) of the first guide channel (5a) is made to enter the channel forming member (9) so as to face the second guide channel (5b). The observation channel (10) is formed around the tip (21) of the first guide channel (5a), and is separated from the second guide channel (5b) of the observation channel (10). The third guide channel (5c) is connected to the position.

  In the above embodiment, the flow path forming member (9) and the lid member (11) are formed separately. However, in the present invention, the flow path forming member (9) and the one lid member (11) may be integrally formed as in Modification 5 shown in FIG.

  In the above embodiment, the case where the observation channel (10) includes a through-hole penetrating the channel forming member (9) has been described. However, in the present invention, as shown in FIG. 7, the flow path forming member (9) can be formed of two members that are in close contact with each other, and can be formed on the close contact surface. That is, FIG. 7A shows a sixth modification, in which the flow path forming member 9 is composed of the first member 9a and the second member 9b, and the first member 9a and the second member 9b are formed. This is a case where the observation channel (10) is formed in a groove shape on one side of the contact surface with the member (9b). FIG. 7 (b) shows a modified example 7 in which the observation channel (10) is formed in a groove shape on both the contact surfaces of the first member (9a) and the second member (9b). It is.

In the case of Modification 6 and Modification 7 described above, the flow path forming member (9) and the lid member (11) may be integrally formed.
That is, in Modification 8 shown in FIG. 8 (a), the observation channel (10) is formed in a groove shape in the first member (9a), and the second member (9b) is integrated with the lid member (11). It is formed.
In Modification 9 shown in FIG. 8 (b), the observation channel (10) is formed in a groove shape in the first member (9a), and the first member (9a) and the second member (9b) are respectively different lids. It is formed integrally with the members (11, 11).
In the modified example 10 shown in FIG. 8 (c), the observation channel (10) is formed in a groove shape in both the first member (9a) and the second member (9b), and the first member (9a) The second member (9b) is formed integrally with different lid members (11, 11).

  The fluid observation container described in the above embodiments and modifications is illustrated to embody the technical idea of the present invention, and the shape, structure, arrangement, and the like of each member are those of this embodiment and the like. The present invention is not limited to this, and various modifications can be made within the scope of the claims of the present invention.

For example, in the above embodiment, the heat insulating material is disposed between the end surface of the cylindrical peripheral wall of the container body and the presser member, but the outer peripheral surface of the cylindrical peripheral wall and the presser member are in partial contact with each other. Explained the case. However, in this invention, you may arrange | position a heat insulating material also between this pressing member and the outer peripheral surface of said cylindrical surrounding wall.
Moreover, in said embodiment, it arrange | positioned so that said pressing member and a distribution pipe may not mutually contact, and the air layer was formed between both. However, in the present invention, a space may be provided between the pressing member and the flow pipe, or a heat insulating material may be disposed between them. Of course, when the temperature of the fluid can be sufficiently controlled, the flow pipe and the pressing member can be brought into direct contact with each other.

In the above embodiment, the case where three guide channels are formed has been described. However, in the present invention, four or more guide channels may be formed, or only two guide channels, a fluid introduction channel and a fluid discharge channel, are provided when the fluid flow state is observed. May be.
In the above embodiment, the case where the cooling water circulation device is provided as the temperature adjusting means around the second guide flow path has been described. However, in the present invention, a temperature adjusting means may be provided around another guide flow path, for example, a heater may be provided as a temperature adjusting means around the first guide flow path.

  In the above embodiment, the container main body is formed in a cylindrical shape, but the container main body of the present invention may be in a cylindrical shape, and may have a shape other than a cylinder, such as a square tube. In the above embodiment, the presser member is formed in a shape in which one corner of the square is cut off obliquely. However, in the present invention, it may be formed in other shapes such as a disk shape.

  In the above embodiment, the fixing means is constituted by a bolt. However, the fixing means used in the present invention only needs to be able to press and fix the pressing members in the proximity direction to each other, and other structures such as a clamp may be used. The container body and the holding member are mainly made of a metal material from the viewpoint of ease of processing, strength, heat resistance, etc., but may be formed of other materials such as ceramics. The transparent material to be configured is not limited to the above sapphire or heat resistant glass. Needless to say, the fluid guided in the guide channel is not limited to the high-temperature and high-pressure water or the raw material fluid.

  The fluid observation device of the present invention can form the container body in a small size, and less heat transfer between the fluid flowing into the container body and the container body, so that the temperature change of the fluid can be easily suppressed. In particular, when a high-temperature fluid such as a supercritical fluid or a subcritical fluid is used, it is suitable as an apparatus for observing the flow state or reaction state of the fluid, but is also suitable as an observation apparatus for other fluids.

It is a partially broken front view of the fluid observation container showing an embodiment of the present invention. It is AA arrow sectional drawing of FIG. It is an expanded sectional view near an observation room of an embodiment of the present invention. It is an expanded sectional view near a sealing member of an embodiment of the present invention. Modifications 1 to 4 of the present invention are shown, FIG. 5A is a cross-sectional view of a flow path forming member of Modification 1, FIG. 5B is a cross-sectional view of a flow path forming member of Modification 2, and FIG. FIG. 5C is a cross-sectional view of the flow path forming member of the third modification, and FIG. 5D is a cross sectional view of the flow path forming member of the fourth modification. FIG. 10 is a partially cutaway view of a flow path forming member and a lid member showing Modification Example 5 of the present invention. Modifications 6 and 7 of the present invention are shown. FIG. 7A is a view corresponding to FIG. 6 of Modification 6 and FIG. 7B is a view corresponding to FIG. FIGS. 8A and 8B show Modifications 8 to 10 of the present invention, FIG. 8A is a view corresponding to FIG. 6 of Modification 8, FIG. 8B is a view corresponding to FIG. 6 of Modification 9, and FIG. FIG. 7 is a view corresponding to FIG. 6.

1 ... Fluid observation container 2 ... Container body
2a ... Cylindrical peripheral wall 3 ... Observation room 4 ... Distribution pipe 5 ... Guide flow path 9 ... Flow path forming member
9a ... 1st member
9b second member
10 ... Observation channel
11… Cover member
13 ... Presser member
14 ... window
15 ... Fixing means
18 ... Temperature adjusting means (cooling water circulation device)

Claims (9)

A cylindrical container body (2) having an observation chamber (3) open at both ends, a flow path forming member (9) made of a transparent material housed in the observation chamber (3), and an observation The chamber (3) has a pair of transparent material lid members (11) for covering the open surfaces of both ends in a tightly sealed manner and a window portion (14), and the lid member (11) is moved to the container body (2) side. A pair of pressing members (13) for pressing,
The container body (2) includes a cylindrical peripheral wall (2a) surrounding the observation chamber (3) and a plurality of guides that penetrate the cylindrical peripheral wall (2a) and communicate with the observation chamber (3). A flow path (5),
The flow path forming member (9) includes an observation flow path (10) that connects the guide flow paths (5) to each other.
The holding members (13) are arranged on both sides of the container body (2) with the observation chamber (3) and the lid member (11) in between, and the holding members (13) are fixed to each other ( 15) and fixing the lid member (11) to the cylindrical peripheral wall (2a) in a close-tight manner by the pressing force by fixing so as to press each other in the proximity direction ,
A flow pipe (4) is projected from the outer peripheral surface of the cylindrical peripheral wall (2a), and the guide channel (5) is formed inside the flow pipe (4).
A fluid observation container, characterized in that a temperature adjusting means (18) is provided at a position between at least one of the guide flow paths (5) and between the pressing members (13) .   The fluid observation container according to claim 1, wherein the pressing member (13) and the cylindrical peripheral wall (2a) are not in contact with each other.   The fluid observation container according to claim 1 or 2, wherein a heat insulating material (20) is disposed between the pressing member (13) and the cylindrical peripheral wall (2a). The fluid observation container according to claim 1 , wherein the pressing member (13) and at least one of the flow pipes (4) are not in contact with each other. The fluid observation container according to any one of claims 1 to 4 , wherein the observation channel (10) includes a through hole penetrating through the channel forming member (9). The fluid observation container according to claim 5 , wherein the flow path forming member (9) and the one lid member (11) are integrally formed. The flow path forming member (9) is composed of a first member (9a) and a second member (9b) which are in close contact with each other, and an adhesive surface between the first member (9a) and the second member (9b) is formed. The fluid observation container according to any one of claims 1 to 4 , wherein the observation channel (10) is formed in a groove shape in at least one of them. The fluid observation container according to claim 7 , wherein at least one of the first member (9a) and the second member (9b) and the lid member (11) are integrally formed. The fluid observation container according to any one of claims 1 to 8, wherein a heater (16) is attached to the pressing member (13).

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