JP6331769B2 - Centrifuge - Google Patents

Description

  The present invention relates to a centrifuge (centrifuge) that rotates a rotor on which a sample is mounted at high speed.

  A centrifuge (centrifuge) is used to separate a sample (for example, culture solution, blood, etc.) for each substance having a different density by centrifugal force during high-speed rotation, or to purify and analyze the sample. In a centrifuge, a tube in which a sample is sealed is attached to a metal rotor that rotates at a high speed, and the rotor rotates at a high speed of, for example, about 20,000 rpm. The type of rotor varies depending on the sample, the purpose of separation, and the sample volume to be separated. For example, an angle rotor that is fixed to the rotor with a constant angle between them while the tube is tilted from the rotation axis, or a bucket loaded with the tube oscillates with rotation and remains horizontal during centrifugation. A swing rotor or the like whose state is maintained is used. In addition, a rotor that can apply a particularly high acceleration to a small amount of sample, or a rotor that can apply a relatively low acceleration to a large-capacity sample is selected as appropriate. For this reason, a plurality of types of rotors are selected and used in a single centrifuge, and the replacement work is easily performed. A large opening is formed above the rotor chamber in which the rotor is accommodated. And the opening can be opened and closed by a door.

  Moreover, it is preferable to precisely control the temperature at the time of performing the centrifugation process. In this case, a refrigeration pipe is provided around the rotor chamber, and the refrigerant passes through the interior of the rotor chamber in order to control the temperature of the rotor chamber. In order to precisely control the temperature, it is necessary to isolate the atmosphere in the rotor chamber from the outside. Therefore, it is necessary to seal the rotor chamber. For this reason, the door that seals the opening is configured such that the opening can be reliably sealed and the opening and closing operation can be easily performed.

  The structure of a centrifuge that satisfies these requirements is described in Patent Document 1, for example. FIG. 4 is a cross-sectional view showing the configuration of the centrifuge 200. In FIG. 4, the rotor 201 is configured to rotate by a motor 203 in a bowl-shaped bowl 202 having an upper opening. The outside of the bowl 202 is further surrounded by a heat insulating layer 205 while being wound around the refrigeration pipe 204. By flowing the refrigerant through the refrigeration pipe 204, the temperature of the bowl 202 and the rotor 201 therein can be controlled during the centrifugal separation process.

  In addition, the upper side of the rotor chamber 220 that is a space in which the rotor 201 is provided is sealed with a door 206 that can be opened and closed. The above structure is housed in a metal box-shaped frame 207. The frame 207 is configured by welding and integrating a frame side wall portion 207A that is the outermost side when viewed from the rotation shaft 203A of the rotor 201 (motor 203) and a partition plate 207B having a horizontal surface shape. The motor 203 is installed so as to protrude upward from the partition plate 207B, and the bowl 202, the heat insulating layer 205, and the like are installed on the upper side of the partition plate 207B so as to be surrounded by the frame side wall portion 207A. On the upper side of the bowl 202, a table 208 provided with an opening 208A smaller than the upper opening of the bowl 202 is installed. The opening on the upper side of the bowl 202 is larger than the opening 208A in the table 208, and the upper end forming the opening of the bowl 202 is located outside the opening 208A in the table 208. Therefore, the upper opening in the rotor chamber 220 is substantially an opening 208 </ b> A provided in the table 208. The openable / closable door 206 is mounted on the upper side of the table 208. When the door 206 is closed, the opening 208A is closed by the door 206, and when the door 206 is opened, the opening 208A is exposed to the upper side. It is supposed to be configured. Further, at the lower part of the bowl 202, the space between the rotary shaft 203A and the bowl 202 is sealed with a seal rubber 209.

  In the above configuration, the bowl 202 around the rotor 201 is thin and the heat insulating layer 205 is formed of a heat insulating material that is thick but low in mechanical strength in order to increase the accuracy of temperature control. The mechanical strength of 205 is low. For this reason, in the above configuration, a cylindrical protector 210 made of a thick steel plate is provided between the frame 207 (frame side wall portion 207A) and the heat insulating layer 205. The central axis of the cylindrical protector 210 is substantially equal to the rotation axis 203A. The protector 210 is provided to absorb energy when the rotor 201 is damaged.

  When manufacturing the centrifuge 200, the motor 208, the bowl 202, the heat insulating layer 205, the protector 210, and the like are installed on the upper side of the partition plate 207B, and the table 208 is installed. At this time, in order to seal the rotor chamber 220, it is necessary to seal between the upper end of the bowl 202 and the lower surface of the table 208, and between the upper surface of the table 208 and the lower surface of the door 206. . At this time, the seal between the door 206 and the table 208 is released when the door 206 is opened, but the bowl 202 and the table 208 are sealed even when the door 206 is opened. Is done.

  FIG. 5 is an enlarged cross-sectional view showing a portion where the packing 211 is mounted. The packing 211 has a first ring portion 211A that seals between the upper end of the bowl 202 and the lower surface of the table 208, and a first ring that seals between the upper surface of the table 208 and the lower surface of the door 206. A second ring portion 211B provided on the upper side of 211A is integrated in the vertical direction. In order to make the elastic deformation particularly easy, the first ring portion 211A is provided with a hollow portion 211AA, and the second ring portion 211B is provided with a hollow portion 211BA. Also, a bowl locking portion 211C that is in contact with the inner surface (the right side surface in FIG. 5) on the upper end side of the bowl 202 is provided below the first ring portion 211A. This configuration is uniformly provided in an annular shape along the inner surface of the table 208 constituting the opening 208A. By making the packing 211 into such an integral shape and fitting the bowl locking portion 211C with the inner surface of the upper end portion of the bowl 202, the mounting can be facilitated. Further, since a burr or the like is often formed on the upper end portion of the bowl 202 to which the packing 211 is mounted after manufacturing, the burr is accommodated between the first ring portion 211A and the bowl locking portion 211C. A recessed portion 211D that can be used is formed, and even if burrs remain, the packing 211 can be securely attached. In the packing 211, in particular, the first ring portion 211A and the second ring portion 211B are sandwiched between the upper end portion of the bowl 202 and the lower surface of the table 208, and between the upper surface of the table 208 and the lower surface of the door 206, and are crushed. As a result, the space between them is sealed. For this reason, the packing 211 is formed of an elastic material that enables such deformation.

  With such a configuration, the rotor chamber 220 can be sealed with the door 206 that can be opened and closed.

JP 2008-93527 A

  When the centrifuge 200 having the configuration shown in FIG. 4 is used, the operator usually does not touch the structure below the table 208, and the operator opens and closes the door 206 above the table 208. A centrifugal separation process is performed. However, during maintenance, an operator may need to touch the lower structure of the rotor chamber 220 (such as the motor 203) and the surrounding structure (such as the refrigeration pipe 204). In such a case, it is necessary to remove the table 208, and in this case, it is also necessary to remove the packing 211. At this time, if the packing 211 is inadvertently pulled, the bowl locking portion 211C may be broken from the recess 211D. Similarly, at the time of assembly, if the bowl locking portion 211C is forcibly pulled and attached to the bowl 202, the bowl locking portion 211C may be broken.

  In general, when the packing 211 is removed and attached again, in order to ensure the above-described sealing performance by the packing 211, the attachment is required to be performed with high accuracy. Maintenance work and assembly of the centrifuge 200 are required. The work was not easy.

  For this reason, it has been difficult to obtain a centrifuge that can be easily maintained and assembled.

  The present invention has been made in view of such problems, and an object thereof is to provide an invention that solves the above problems.

In order to solve the above problems, the present invention has the following configurations.
The centrifuge of the present invention includes a rotor chamber in which a rotating rotor is accommodated, a table provided with an opening and provided on the rotor chamber, and a state in which the centrifuge can be freely opened and closed on the table. Then, a centrifuge having a door for closing the opening, and having a bowl-like shape for accommodating the rotor under the table, and an upper end portion constituting the opening in the bowl-like shape is A bowl disposed near the opening of the table; and a protector surrounding the bowl; the upper end of the bowl provided between the upper end of the bowl and the lower surface of the table a first packing which is mounted to the bowl is a form sandwiching from inside and outside of the bowl, across the inner end portion constituting the opening portion of the table from the upper and lower Is the state mounted on the table, and the upper surface of the table, closed so as to seal between the underside of the door in the state, the second provided to be the first packing and the separate comprising a packing, a, in a state in which the door is closed, the said rotor chamber and the first packing by said second packing is sealed, and said second gasket and said first gasket Are combined so that the lowermost surface of the second packing and the uppermost surface of the first packing are in contact with each other, thereby sealing between the upper end of the bowl and the lower surface of the table. It is characterized by .
In the centrifuge of the present invention, an upper end portion of the protector is configured to be positioned below the second packing.
In the centrifuge of the present invention, when the first packing moves in the horizontal direction due to the deformation of the bowl in a state where the rotor chamber is sealed, the second packing is attached to the table. The state is maintained.
In the centrifuge according to the present invention, a refrigeration pipe through which a refrigerant flows is wound around the bowl.

  Since the present invention is configured as described above, a centrifuge that can be easily maintained and assembled can be obtained.

It is sectional drawing which shows the structure of the centrifuge which concerns on embodiment of this invention. It is sectional drawing which expands and shows the structure of the 1st packing used in the centrifuge which concerns on embodiment of this invention, a 2nd packing, and its periphery. It is sectional drawing which expands and shows the structure of the 1st packing used in the centrifuge which concerns on embodiment of this invention, and a 2nd packing. It is sectional drawing which shows the structure of the conventional centrifuge. It is sectional drawing which expands and shows the packing used in the conventional centrifuge and the surrounding structure.

  A centrifuge (centrifuge) according to an embodiment of the present invention will be described. In this centrifuge, a protector is used outside the rotor chamber as in the configuration of FIG. Here, this protector can be made light and inexpensive with its deformation suppressed.

  FIG. 1 is a cross-sectional view showing the configuration of the centrifuge 1 and corresponds to FIG. Here, the rotor 10, the bowl 11, the motor 12, the rotating shaft 12A, the refrigeration pipe 13, the heat insulating layer 14, the protector 15, the table 16 having the opening 16A, the door 17, the frame 18 (the frame side wall 18A, the partition plate 18B). The seal rubber 19 is used in the same manner as the centrifuge 200 (FIG. 3). Similarly, the rotor 10 is provided in the rotor chamber 20 and sealed by a door 17 that can be opened and closed.

  In the centrifuge 1, the first packing 21 is between the upper end of the bowl 11 and the lower surface of the upper table 16, and the first packing 21 is between the upper surface of the table 16 and the lower surface of the upper door 17. These are sealed with second packings 22 that are separate from the packings 21.

  FIG. 2 is an enlarged cross-sectional view showing the first packing 21, the second packing 22, and the surrounding structure in FIG. Both the first packing 21 and the second packing 22 are made of an elastic material. The first packing 21 is mounted over the entire circumference of the upper end portion that forms the upper opening in the bowl 11. The second packing 22 is mounted over the entire circumference of the inner end portion constituting the opening 16A in the table 16. In a state where the rotor chamber 20 is sealed, the upper portion of the first packing 21 and the upper portion of the second packing 22 are in contact with each other, thereby sealing the space therebetween.

  As shown in FIG. 2, in the first packing 21, the elastic deformation portion 21 </ b> A that elastically deforms between the upper end portion of the bowl 11 and the lower surface of the table 16, and the lower end thereof is attached to the upper end portion of the bowl 11. The mounting portion 21B is provided integrally. FIG. 3A shows the configuration of the first packing 21 in further detail and in detail. The elastic deformation portion 21A is provided with a hollow portion 21AA in order to further facilitate the elastic deformation. On the other hand, the mounting portion 21B holds the upper end portion of the bowl 11 from the inner surface side (the right side in FIGS. 2 and 3A) and the outer surface side (the same left side) of the bowl 11, thereby Mounted from the bottom to the bottom. At this time, on the inner surface of the mounting portion 21B in contact with the outer surface of the bowl 11, a mounting locking portion 21BB protruding in a shape inclined toward the outer surface side of the bowl 11 toward the upper side (the direction opposite to the mounting direction) is provided. . Even when a force is applied to the upper side of the first packing 21 when the first packing 21 is mounted on the upper end of the bowl 11 by the mounting locking portion 21BB, the first packing 21 It becomes difficult to come off from the upper end. On the other hand, it is easy to attach the first packing 21 to the upper end of the bowl 11 from above. At this time, the space between them can be fixed using a silicone-based adhesive.

  As shown in FIG. 2, the second packing 22 also has an elastic deformation portion 22 </ b> A that elastically deforms between the upper surface of the table 16 and the lower surface of the door 17, and is attached to the inner end portion of the table 16 on the lower side. Similarly, the mounting portion 22B is provided integrally. FIG. 3B shows the configuration of the second packing 22 in further detail and in detail. The elastic deformation portion 22A is provided with a hollow portion 22AA in order to further facilitate the elastic deformation. On the other hand, the mounting portion 22B sandwiches the inner end portion of the table 16 (the right end portion in FIGS. 2 and 3B) from the lower surface side and the upper surface side of the table 16 so that the inner side (FIG. It is mounted from the right side in FIG. 3B toward the outside (the right side). At this time, on the inner surface of the mounting portion 22B that contacts the upper surface and the lower surface of the table 16, a plurality of mounting locking portions 22BB that protrude in a shape inclined toward the table 16 toward the inner side (the direction opposite to the mounting direction) are provided on both sides. Is provided. Even when a force is applied to the inner side of the second packing 22 when the second packing 22 is mounted on the inner end portion of the table 16 by the mounting locking portion 22BB, the second packing 22 remains on the table 16 It becomes difficult to come off from the inner end of the. On the other hand, mounting of the second packing 22 to the inner end of the table 16 is easy. At this time, the space between them can be fixed using a silicone-based adhesive.

  In the centrifuge 1, the table 16 can be removed while the second packing 22 is attached to the table 16 and the first packing 21 is attached to the bowl 11. For this reason, maintenance of components below the table 16 can be easily performed.

  At this time, in the configuration of FIG. 2, the upper end surface of the protector 15 outside the bowl 11 is made lower than the lower end portion of the second packing 22, that is, by setting H shown in FIG. In addition, even if the protector 15 is greatly deformed or moved inward, the influence on the second packing 22 can be removed.

  The first packing 21 and the second packing 22 having the above-described structure have a simple annular structure whose cross-sectional shape is shown in FIG. 3, and it is not necessary to provide members made of different materials inside. For this reason, these can be manufactured easily and inexpensively.

  Similarly to the above, the first packing is between the upper end of the bowl and the lower surface of the table, the second packing is sealed between the upper surface of the table and the lower surface of the door, and the first packing Obviously, if the packing and the second packing are separated and mounted, the same effect can be obtained. For example, in the above configuration, the mounting portions 21B and 22B of the above-described form are used, but the mounting method of the first packing, the second packing bowl, and the table is arbitrary. In particular, in the above configuration, since it is not necessary to remove the first packing and the second packing during maintenance (when removing the table), it is difficult to remove them by firmly joining them to the bowl and the table. It can also be configured.

  Further, as shown in FIG. 2, in the above configuration, the lower end of the second packing is in contact with the upper end of the first packing at the time of sealing, but the second packing is provided only on the upper surface side of the table. The lower surface of the table and the upper end of the first packing may be in direct contact with each other. Even if it is such a shape, as long as the 2nd packing is fixed to a table, there exists the same effect. Also, the shape of the first packing can be set as appropriate according to the shape of the upper end of the bowl. For example, it is also possible to adopt a form in which the first packing is affixed and fixed to the upper surface formed by bending the upper end of the bowl toward the outside.

  In particular, since the first packing and the second packing are separated, such various forms can be realized. However, the first packing 21 and the second packing 22 in the form of FIG. 3 are most preferable because the shapes of the bowl and the table are kept as they are and the mounting is easy.

1,200 Centrifuge (Centrifuge)
10, 201 Rotor 11, 202 Bowl 12, 203 Motor 12A, 203A Rotating shaft 13, 204 Refrigeration piping 14, 205 Heat insulation layer 15, 210 Protector 16, 208 Table 16A, 208A Opening 17, 206 Door 18, 207 Frame 18A, 207A Frame side wall (frame)
18B, 207B Partition plate (frame)
19, 209 Seal rubber 20 Rotor chamber 21 First packing 21A, 22A Elastic deformation portion 21B, 22B Mounting portion 21AA, 22AA, 211AA, 211BA Hollow portion 21BB, 22BB Mounting locking portion 22 Second packing 211 Packing 211A First Ring part 211B second ring part 211C bowl locking part 211D recess

Claims (4)

A rotor chamber containing a rotating rotor;
A table provided with an opening and provided on the rotor chamber;
A door that is openable and closable on the table and that closes the opening in a closed state;
A centrifuge comprising:
A bowl having a bowl-like shape for accommodating the rotor under the table, and an upper end portion constituting an opening in the bowl-like shape being disposed in the vicinity of the opening in the table;
A protector surrounding the bowl,
A first packing provided between the upper end portion of the bowl and the lower surface of the table, the upper end portion of the bowl being sandwiched from the inside and outside of the bowl, and attached to the bowl;
The inner end portion constituting the opening of the table is sandwiched from the upper side and the lower side and is attached to the table, and seals between the upper surface of the table and the lower surface of the door in the closed state. A second packing provided separately from the first packing; and
Comprising
In a state in which the door is closed, the top of the first of the rotor chamber is sealed packing and by said second gasket and said second gasket first packing and said second packing A centrifuge characterized in that the lower surface and the uppermost surface of the first packing are combined so as to be in contact with each other so that the upper end of the bowl and the lower surface of the table are sealed . The upper end of the protector, centrifuge according to claim 1, characterized in that it is configured to positioned lower than the second packing. In a state where the rotor chamber is sealed,
When the by the bowl is deformed first packing is moved in the horizontal direction, according to claim 1 or 2 wherein the second packing, characterized in that the state of being mounted on the table is maintained Centrifuge. The centrifuge according to any one of claims 1 to 3, wherein a refrigeration pipe around which the refrigerant flows is wound around the bowl.

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