Atomic absorption spectrophotometer

Abstract

The atomic absorption spectrophotometer includes a first support (120), a fixed part (170), and a movable part (180). On the inner circumferential surface of the fixed part (170), a first internal thread (172) is formed from the rear end of the fixed part (170) toward the front end in the insertion direction of the first support (120), and a reduced-diameter part (173) is formed relative to the front end of the first internal thread (172) in the insertion direction and has an inner diameter smaller than the minimum diameter of the first internal thread (172). On the inner circumferential surface of the movable part (180), a second internal thread (183) is formed from the rear end of the movable part (180) toward the front end in the insertion direction and has a minimum diameter larger than the maximum diameter of the first internal thread (172).

Description

Technical Field

[0001] This invention relates to atomic absorption spectrophotometers. Background Technology

[0002] As an existing document that discloses the structure of an atomic absorption spectrophotometer, there is Japanese Patent Application Publication No. 2000-65737 (Patent Document 1). In the atomic absorption spectrophotometer described in Patent Document 1, a cup and a handle are used to assemble and disassemble a graphite support that is pressed into a cooling block.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2000-65737 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] When using a cup and handle to install or remove the bracket pressed into the cooling block, the cup and handle are in opposite positions relative to the bracket during installation and removal. Therefore, it is necessary to be able to approach the bracket from both sides in the installation / removal direction.

[0008] The present invention was made to solve the above-mentioned problems, and its purpose is to provide an atomic absorption spectrophotometer that can be accessed from one side of the support in the support assembly / disassembly direction for assembly and disassembly.

[0009] Solution for solving the problem

[0010] In the atomic absorption spectrophotometer based on the present invention, a support with a holding tube and a through hole is detachably embedded in a block, and the tube heats the sample by flowing current through it. The atomic absorption spectrophotometer includes a fixed part and a movable part. The fixed part is provided about an axis extending along an imaginary axis along the embedding direction of the support relative to the block, is located at a position separated from the support in the embedding direction towards the front, and is fixed relative to the block. The movable part is provided about the axis of the imaginary axis, is located in the front of the support in the embedding direction, and can move along the imaginary axis outside the fixed part to abut against the support from the front side in the embedding direction. On the inner circumferential surface of the fixed part, a first internal thread is formed from the rear end of the fixed part in the embedding direction toward the front side, and a reduced diameter part is formed relative to the first internal thread and located in the front of the embedding direction, having an inner diameter smaller than the minimum diameter of the first internal thread. On the inner circumferential surface of the movable part, a second internal thread portion having a minimum diameter larger than the maximum diameter of the first internal thread portion is formed from the rear end of the movable part in the aforementioned insertion direction toward the front side. By inserting a first bolt, including a first external thread portion and a shaft portion, into the through hole from the aforementioned insertion direction, and screwing the first external thread portion into the first internal thread portion, the bracket can be pushed from the rear side toward the front side in the aforementioned insertion direction using the first bolt. The first external thread portion is located on the front side in the aforementioned insertion direction and has a maximum diameter smaller than the minimum diameter of the second internal thread portion and is engaged with the first internal thread portion. The shaft portion is located on the rear side of the first external thread portion in the aforementioned insertion direction and has an outer diameter smaller than the minimum diameter of the second internal thread portion. By inserting a second bolt, including an abutment portion and a second external thread portion, into the through hole from the aforementioned embedding direction, and screwing the second external thread portion into the second internal thread portion while the abutment portion abuts against the reduced diameter portion, the bracket can be pushed from the front side to the rear side in the aforementioned embedding direction using a movable portion that moves toward the bracket. The abutment portion is located on the front side in the aforementioned embedding direction and has an outer diameter that is smaller than the minimum diameter of the first internal thread portion and larger than the inner diameter of the reduced diameter portion, and can abut against the reduced diameter portion in the aforementioned embedding direction. The second external thread portion is located on the rear side of the abutment portion in the aforementioned embedding direction and engages with the second internal thread portion.

[0011] The effects of the invention

[0012] According to the present invention, the bracket can be accessed from one side of the bracket's disassembly / assembly direction to disassemble / assemble the bracket. Attached Figure Description

[0013] Figure 1 This is a perspective view showing the appearance of an atomic absorption spectrophotometer according to one embodiment.

[0014] Figure 2 Observing from the direction of arrow II Figure 1 A top view of an atomic absorption spectrophotometer.

[0015] Figure 3 Observe from the direction of the arrow on line III-III Figure 2 A cross-sectional view of an atomic absorption spectrophotometer.

[0016] Figure 4 This is a partial cross-sectional view showing the state in which the second block is moved away from the first block in an atomic absorption spectrophotometer according to one embodiment.

[0017] Figure 5 This is a top view showing the structure of the first bolt used when the first support is mounted on the first block in an atomic absorption spectrophotometer according to one embodiment.

[0018] Figure 6 This is a top view showing the structure of the second bolt used when the first bracket in one embodiment is detached from the first block.

[0019] Figure 7 This is a cross-sectional view showing the state of an atomic absorption spectrophotometer of one embodiment before the first support is installed on the first block.

[0020] Figure 8 This is a cross-sectional view showing the state of the first support of an atomic absorption spectrophotometer according to one embodiment after the first block is installed.

[0021] Figure 9 This is a cross-sectional view showing the state before the second bolt is inserted into the movable part of an atomic absorption spectrophotometer of one embodiment.

[0022] Figure 10 This is a cross-sectional view showing the state in which the abutting part of the second bolt abuts against the reduced diameter part of the fixing part provided by an atomic absorption spectrophotometer of one embodiment.

[0023] Figure 11 This is a cross-sectional view showing the state in which the first support of an atomic absorption spectrophotometer according to one embodiment is detached from the first block. Detailed Implementation

[0024] The atomic absorption spectrophotometer of one embodiment will now be described with reference to the accompanying drawings. In the following description of the embodiment, the same or equivalent parts in the drawings will be labeled with the same reference numerals, and their descriptions will not be repeated. Furthermore, in the drawings, the direction parallel to the optical axis of the irradiation light used for atomic absorption analysis is designated as the X direction, the direction parallel to the embedding direction of the support is designated as the Y direction, and the direction parallel to the sample injection direction is designated as the Z direction.

[0025] Figure 1This is a perspective view showing the appearance of an atomic absorption spectrophotometer according to one embodiment. Figure 2 Observing from the direction of arrow II Figure 1 A top view of an atomic absorption spectrophotometer. Figure 3 Observe from the direction of the arrow on line III-III Figure 2 A cross-sectional view of an atomic absorption spectrophotometer.

[0026] like Figures 1-3 As shown, an atomic absorption spectrophotometer 1 according to one embodiment includes a sample heating section 10. The sample heating section 10 is a part that atomizes the sample by electrically heating the sample. The sample heating section 10 includes a tube 100, a support 110, and a block 140. The sample heating section 10 is made of a conductive material for electrically heating the sample.

[0027] like Figure 3 As shown, the atomic absorption spectrophotometer 1 of this embodiment also includes a fixed part 170 and a movable part 180. Figure 1 and Figure 2 As shown, the atomic absorption spectrophotometer 1 also includes a pair of coils 20, a actuator 30, a rod 31, a base 40, a sliding mechanism 41, and a support platform 42. Figure 3 As shown, the atomic absorption spectrophotometer 1 also includes a spring 190, a gas inlet 150, and a cap 151.

[0028] like Figure 1 and Figure 2 As shown, a pair of coils 20 sandwich the sample heating section 10 in the middle and are arranged opposite each other. The direction in which the pair of coils 20 are arranged is consistent with the optical axis of the irradiation light used in atomic absorption analysis.

[0029] The pusher 30 is disposed on the upper and rear sides of the sample heating section 10. The pusher 30 rotates about a rotation axis connected to the rod 31 as a fulcrum by moving the rod 31. Figure 1 The arrow in the middle moves in the direction of the movement, as shown in the image. Figure 1 In the upright position shown, the pusher 30 pushes the sample heating section 10 in the Z direction. The pusher 30 is provided with a sample injection hole 32. The sample is introduced into the interior of the tube 100 through the sample injection hole 32. The sample injection hole 32 is opened and closed by a cover (not shown).

[0030] like Figure 3As shown, tube 100 extends along the X direction. A circular cross-section space for sample injection is formed inside tube 100. Tube 100 has a sample injection port 101 at its upper part in the Z direction. A flow path is formed in tube 100 for the flow of inactive gas supplied from gas inlet 150. The sample injected into the interior of tube 100 from the sample injection port 101 is heated by the heat generated in tube 100 when an electric current flows through it. Tube 100 is, for example, made of graphite. Tube 100 is pushed from the Z direction by pusher 30 during sample injection and analysis.

[0031] The support 110 is composed of a first support 120 and a second support 130. The first support 120 and the second support 130 are arranged opposite each other in the Y direction and hold the tube 100 between them. The first support 120 and the second support 130 are formed of graphite, for example.

[0032] The first bracket 120 and the second bracket 130 each have a through hole extending in the Y direction. A groove extending in the Y direction is formed on the outer periphery of each of the first bracket 120 and the second bracket 130. By fitting a locating pin 143 into the groove, rotation of the first bracket 120 and the second bracket 130 is prevented.

[0033] Block 140 is composed of a first block 141 and a second block 145. Both the first block 141 and the second block 145 have through holes extending along the Y direction. A first bracket 120 is detachably inserted into the first block 141. The insertion direction of the first bracket 120 relative to the first block 141 is one direction in the Y direction. A second bracket 130 is detachably inserted into the second block 145. The insertion direction of the second bracket 130 relative to the second block 145 is another direction in the Y direction.

[0034] The first bracket 120 is embedded into the first block 141, making the first block 141 and the first bracket 120 fit together, thereby improving the conductivity between the first block 141 and the first bracket 120. The second block 145 is embedded into the second bracket 130, making the second block 145 and the second bracket 130 fit together, thereby improving the conductivity between the second block 145 and the second bracket 130.

[0035] The first piece 141 is supported on the base 40 from the lower side in the Z-axis direction. For example... Figures 1-3 As shown, a sliding mechanism 41 is provided on the base 40. The sliding mechanism 41 supports the support platform 42 connected to the second block 145 so that it can move in the Y direction. Thus, the second block 145 can move in the Y direction.

[0036] By applying an electric current between the first block 141 and the second block 145, the current flows through the first support 120 and the second support 130 to the tube 100, causing the tube 100 to heat up.

[0037] The fixing part 170 has a tubular shape and includes a circular tube portion 175 and a flange portion 176 located on the front side (one side in the Y direction) of the circular tube portion 175 in the aforementioned embedding direction. It is disposed about an axis extending along an imaginary axis 120a along the embedding direction of the first bracket 120 relative to the first block 141. The fixing part 170 is located separated from the first bracket 120 on the front side (one side in the Y direction) in the aforementioned embedding direction and is fixed relative to the first block 141. Specifically, with the circular tube portion 175 passing through the interior of the annular sleeve 171, the fixing part 170 is fastened to the first block 141 by bolts, with the sleeve 171 sandwiched between the first block 141 and the flange portion 176.

[0038] A first internal thread portion 172 is formed on the inner peripheral surface of the fixing portion 170, extending from the rear end (the other side in the Y direction) of the fixing portion 170 in the aforementioned embedding direction toward the front end (one side in the Y direction). Furthermore, a reduced diameter portion 173 is formed on the inner peripheral surface of the fixing portion 170, which is located on the front side (one side in the Y direction) of the aforementioned embedding direction relative to the first internal thread portion 172 and has an inner diameter smaller than the minimum diameter of the first internal thread portion 172. A gas inflow portion 174 for inactive gas supplied from the gas inlet portion 150 is located on the front side (one side in the Y direction) of the reduced diameter portion 173 in the aforementioned embedding direction.

[0039] The movable part 180 has a tubular shape and includes a circular tube portion 185 and a flange portion 186 located on the front side (one side in the Y direction) of the circular tube portion 185 in the aforementioned embedding direction, and is arranged about the axis of the imaginary axis 120a. The movable part 180 is located on the front side (one side in the Y direction) of the aforementioned embedding direction relative to the first bracket 120, and is configured to move along the imaginary axis 120a outside the circular tube portion 175 of the fixed part 170, and is able to abut against the first bracket 120 from the front side (one side in the Y direction) of the aforementioned embedding direction.

[0040] On the inner peripheral surface of the movable portion 180, a second internal thread portion 183 is formed from the rear end (the other side in the Y direction) of the movable portion 180 in the aforementioned insertion direction toward the front side (one side in the Y direction), having a minimum diameter larger than the maximum diameter of the first internal thread portion 172. Specifically, the second internal thread portion 183 is provided on the inner peripheral surface of the cylindrical internal thread member 182, which can be detachably inserted into the inner side of the rear end (the other side in the Y direction) of the movable portion 180 in the aforementioned insertion direction.

[0041] A groove extending in the Y direction is provided on the outer periphery of the movable part 180, and the movable part 180 is prevented from rotating by fitting a positioning pin 143 in the groove. The movable part 180 can move in the Y direction along the circular tube portion 175 of the fixed part 170.

[0042] Spring 190 applies force to movable part 180 towards the front side (one side in the Y direction) in the aforementioned embedding direction. Spring 190 is clamped between flange 186 of movable part 180 and first block 141. Due to the force of spring 190, flange 186 of movable part 180 pushes flange 176 of fixed part 170 from the rear side (the other side in the Y direction) in the aforementioned embedding direction.

[0043] like Figure 3 As shown, the gas inlet 150 is connected to the first block 141 via the fixing part 170. A cap 151 is provided on the second block 145 opposite to the gas inlet 150. The space inside the inner circumferential surface of the fixing part 170 communicates with the tube 100 via the space inside the inner circumferential surface of the movable part 180 and the through hole 121 of the first support 120. By allowing an inert gas supplied from the gas inlet 150 to pass through the tube 100, oxidation of the tube 100 due to high temperatures during sample analysis is prevented. An example of the inert gas is argon.

[0044] In the atomic absorption spectrophotometer 1 of this embodiment, the sample is transported from the sample injection hole 32 of the pusher 30 through the sample injection port 101 into the interior of the tube 100, and is heated and atomized by the heat of the tube 100. Atomic absorption analysis is performed based on light irradiated from the X direction through the tube 100.

[0045] A pair of coils 20 are positioned on either side of the tube 100 along an axial direction intersecting the embedding direction of the first block 141 relative to the first support 120. These coils can be powered via electrical wiring (not shown) to apply a magnetic field to the tube 100 located between the coils 20. Applying a magnetic field to the tube 100 allows for background correction of the sample's analytical values, thereby improving analytical accuracy. One example of this correction method is Zeeman splitting correction.

[0046] The following describes the method for replacing tube 100 and support 110 in the atomic absorption spectrophotometer 1 of this embodiment. When replacing tube 100 and support 110, the pusher 30 is first retracted, and the sliding mechanism 41 is used to move the second block 145 to the other side in the Y direction away from the first block 141.

[0047] Figure 4 This is a partial cross-sectional view showing the state in which the second block is moved away from the first block in an atomic absorption spectrophotometer according to one embodiment. (e.g.) Figure 4As shown, the tube 100 can be removed by moving the second piece 145 away from the first piece 141. Furthermore, by removing the cap 151 from the second piece 145, the second bracket 130 can be approached from both sides in the disassembly / removal direction, thus allowing for disassembly / removal of the second bracket 130 relative to the second piece 145 using conventional methods. On the other hand, the first bracket 120 can only be approached from one side in the disassembly / removal direction, namely the rear side in the aforementioned embedding direction (the other side in the Y direction).

[0048] In the atomic absorption spectrophotometer 1 of this embodiment, when replacing the first support 120, due to the constraints of the configuration of the pair of coils 20 and the actuator 30, a special tool that can be approached and disassembled from one direction is required when installing and removing the first support 120.

[0049] The following describes the special tool used in this embodiment for assembling and disassembling the first bracket 120 relative to the first block 141.

[0050] Figure 5 This is a top view showing the structure of the first bolt used when mounting the first support to the first block in an atomic absorption spectrophotometer according to one embodiment. (Example) Figure 5 As shown, the first bolt 200 has a first external thread portion 201, a first shaft portion 202, and a second shaft portion 203.

[0051] The first external thread portion 201 is located at the front end of the first bolt 200 on the front side (one side in the Y direction) in the aforementioned insertion direction. The first external thread portion 201 has a maximum diameter smaller than the minimum diameter of the second internal thread portion 183.

[0052] The first shaft portion 202 is connected to the first external thread portion 201. The first shaft portion 202 is located on the rear side (the other side in the Y direction) of the first external thread portion 201 in the aforementioned insertion direction. The first shaft portion 202 has an outer diameter smaller than the minimum diameter of the second internal thread portion 183.

[0053] The second shaft portion 203 is connected to the side of the first shaft portion 202 opposite to the side of the first external thread portion 201. The second shaft portion 203 has an outer diameter smaller than the through hole 121 of the first bracket 120.

[0054] Figure 6 This is a top view showing the structure of the second bolt used to detach the first bracket from the first block in one embodiment. (See attached image.) Figure 6 As shown, the second bolt 210 has an abutment portion 211 and a second external thread portion 212.

[0055] The abutment portion 211 is located at the front end of the second bolt 210 on the front side (one side in the Y direction) in the aforementioned insertion direction. The abutment portion 211 has an outer diameter that is smaller than the minimum diameter of the first internal thread portion 172 and larger than the inner diameter of the reduced diameter portion 173.

[0056] The second external thread portion 212 is connected to the abutment portion 211. The second external thread portion 212 is located on the rear side (the other side in the Y direction) of the abutment portion 211 in the aforementioned insertion direction. The second external thread portion 212 has a maximum diameter that can engage with the second internal thread portion 183.

[0057] The following describes the operation of mounting the first support 120 onto the first block 141 in the atomic absorption spectrophotometer 1 of this embodiment.

[0058] Figure 7 This is a cross-sectional view showing the state of an atomic absorption spectrophotometer of one embodiment before the first support is installed on the first block. Figure 8 This is a cross-sectional view showing the state of an atomic absorption spectrophotometer according to one embodiment, with the first support mounted after the first block. Furthermore, in Figure 7 and Figure 8 For ease of understanding, the thread shape of the first external thread portion 201 is not shown.

[0059] like Figure 7 As shown, when the first bracket 120 is installed on the first block 141, a clamping block 220 can be used. The clamping block 220 has the function of mitigating stress concentration by increasing the area affected by the axial force generated by tightening the first bolt 200. The clamping block 220 has a hole through which the first bolt 200 passes. The first bolt 200 passes through the hole in the clamping block 220 and also passes through the through hole 121 of the first bracket 120 from the aforementioned insertion direction. As a result, the clamping block 220 is clamped between the head of the first bolt 200 and the first bracket 120.

[0060] The first external thread portion 201 has a maximum diameter smaller than the minimum diameter of the second internal thread portion 183, thus allowing it to be inserted into the inner side of the inner circumferential surface of the movable portion 180. The first shaft portion 202 has an outer diameter smaller than the minimum diameter of the second internal thread portion 183, thus allowing it to be inserted into the inner side of the inner circumferential surface of the movable portion 180. With the first external thread portion 201 and the first shaft portion 202 partially inserted into the movable portion 180, the first external thread portion 201 engages with the first internal thread portion 172.

[0061] like Figure 8As shown, the first bolt 200 is inserted into the through hole 121 of the first bracket 120 from the above-mentioned embedding direction, and the first external thread 201 is screwed into the first internal thread 172, thereby enabling the first bracket 120 to be pushed from the rear side (the other side in the Y direction) to the front side (one side in the Y direction) in the above-mentioned embedding direction by means of the first bolt 200 via the clamp block 220.

[0062] Specifically, when the first external thread 201 is screwed into the first internal thread 172, the fixing part 170 is fixed to the first block 141. Therefore, by utilizing the axial force generated by the first bolt 200, the first bracket 120 is pushed towards the front side (one side in the Y direction) in the above-mentioned embedding direction via the clamp block 220, so that the first bracket 120 is embedded into the first block 141.

[0063] The following describes the operation of detaching the first support 120 from the first block 141 in the atomic absorption spectrophotometer 1 of this embodiment.

[0064] Figure 9 This is a cross-sectional view showing the state before the second bolt is inserted into the movable part of an atomic absorption spectrophotometer of one embodiment. Figure 10 This is a cross-sectional view showing the state in which the abutting part of the second bolt abuts against the reduced diameter part of the fixing part provided by an atomic absorption spectrophotometer of one embodiment. Figure 11 This is a cross-sectional view showing the first support of an atomic absorption spectrophotometer according to one embodiment detached from the first block. Furthermore, in Figures 9-11 For ease of understanding, the thread shape of the second external thread portion 212 is not shown.

[0065] like Figure 9 and Figure 10 As shown, when the first bracket 120 is disengaged from the first block 141, the second bolt 210 passes through the through hole 121 of the first bracket 120 from the aforementioned embedding direction.

[0066] The abutment portion 211 has an outer diameter smaller than the minimum diameter of the second internal thread portion 183, thus allowing it to be inserted into the space inside the inner circumferential surface of the movable portion. Since the abutment portion 211 has an outer diameter smaller than the minimum diameter of the first internal thread portion 172 and larger than the inner diameter of the reduced diameter portion 173, it can be inserted into the inside of the first internal thread portion 172 and abut against the reduced diameter portion 173 in the aforementioned insertion direction. With the abutment portion 211 abutting against the reduced diameter portion 173, the second external thread portion 212 engages with the second internal thread portion 183.

[0067] like Figure 11As shown, by screwing the second external thread 212 of the second bolt 210 into the second internal thread 183 while the abutting portion 211 of the second bolt 210 abuts against the reduced diameter portion 173, the movable portion 180 that moves toward the first bracket 120 can push the first bracket 120 from the front side (one side in the Y direction) toward the rear side (the other side in the Y direction) in the above-mentioned embedding direction.

[0068] With the abutment portion 211 abutting against the reduced diameter portion 173, the second external thread portion 212 is screwed into the second internal thread portion 183, and the movable portion 180 overcomes the force of the spring 190 and moves from the front side (one side in the Y direction) to the rear side (the other side in the Y direction) in the aforementioned embedding direction. By pushing the first bracket 120 with the movable portion 180, the first bracket 120 is disengaged from the first block 141.

[0069] After the first support 120 disengages from the first block 141, when the engagement between the second external thread 212 and the second internal thread 183 is released, the movable part 180 moves to abut against the flange 176 of the fixed part 170 by means of the force of the spring 190. Thus, the movable part 180 separates from the first support 120 during sample analysis without contacting it.

[0070] In an atomic absorption spectrophotometer 1 according to one embodiment of the present invention, the first bracket 120 is pushed forward in the embedding direction by screwing the first bolt 200 into the fixing part 170, and the first bracket 120 is pushed backward in the embedding direction by screwing the second bolt 210 into the movable part 180 through the abutment part 211 and the reduced diameter part 173. This allows the first bracket 120 to be approached from one direction in the assembly / disassembly direction and assembled / disassembled relative to the first block 141. Furthermore, since the first bracket 120 can be approached from one direction for assembly / disassembly, the space required for the assembly / disassembly of the first bracket 120 can be reduced, thus saving space in the device. In addition, the mounting of the fixing part 170 and the movable part 180 onto the first block 141 simplifies the assembly / disassembly operation, thus shortening the assembly / disassembly time.

[0071] In an atomic absorption spectrophotometer 1 according to one embodiment of the present invention, the first support 120 can be accessed from one side of the disassembly / removal direction and disassembled / removed relative to the first block 141. Therefore, in the case of a mechanism employing Zeeman split correction, the first support 120 can be disassembled / removed between a pair of coils 20.

[0072] In an atomic absorption spectrophotometer 1 according to one embodiment of the present invention, the movable part 180 is forced forward in the embedding direction of the first support 120 by the spring 190, so that the first support 120 and the movable part 180 can be kept out of contact during sample analysis. This can suppress the heat conduction from the first support 120 to the movable part 180 during sample analysis.

[0073] In an atomic absorption spectrophotometer 1 according to one embodiment of the present invention, the space inside the inner circumferential surface of the fixed part 170 is connected to the tube 100 via the space inside the inner circumferential surface of the movable part 180 and the through hole 121 of the first support 120. This allows inactive gas to be directly blown into the tube 100 from the gas inlet 150. As a result, the tube 100 can be effectively cooled, thereby suppressing oxidation of the tube 100.

[0074] [plan]

[0075] Those skilled in the art will understand that the above exemplary embodiments are specific examples of the following schemes.

[0076] (Item 1)

[0077] An atomic absorption spectrophotometer scheme, wherein,

[0078] A support with a through-hole and retaining tube can be detachably embedded in the block. Current flows through the tube, thereby heating the sample.

[0079] This atomic absorption spectrophotometer has the following features:

[0080] A fixing part, which is arranged about an axis extending along an imaginary axis along the insertion direction of the bracket relative to the block, is located at a position separated from the bracket on the front side in the insertion direction, and is fixed relative to the block; and

[0081] A movable part, which is arranged about the axis of the imaginary axis, is located at the front side of the insertion direction relative to the bracket, and is configured to move along the imaginary axis outside the fixed part so as to abut against the bracket from the front side of the insertion direction.

[0082] On the inner circumferential surface of the fixing part, a first internal thread portion is formed from the rear end of the fixing part in the insertion direction toward the front side, and a reduced diameter portion is formed relative to the first internal thread portion located at the front side in the insertion direction and having an inner diameter smaller than the minimum diameter of the first internal thread portion.

[0083] On the inner circumferential surface of the movable part, a second internal thread portion having a minimum diameter larger than the maximum diameter of the first internal thread portion is formed from the rear end of the movable part in the insertion direction toward the front side.

[0084] By inserting a first bolt, comprising a first external thread and a shaft portion, into the through hole from the embedding direction, and screwing the first external thread into the first internal thread, the bracket can be pushed from the rear side to the front side in the embedding direction using the first bolt. The first external thread is located on the front side in the embedding direction and has a maximum diameter smaller than the minimum diameter of the second internal thread and engages with the first internal thread. The shaft portion is located on the rear side of the first external thread in the embedding direction and has an outer diameter smaller than the minimum diameter of the second internal thread.

[0085] By inserting a second bolt, including an abutment portion and a second external thread portion, into the through hole from the embedding direction, and screwing the second external thread portion into the second internal thread portion while the abutment portion abuts against the reduced diameter portion, the bracket can be pushed from the front side to the rear side in the embedding direction using the movable portion that moves toward the bracket. The abutment portion is located on the front side in the embedding direction and has an outer diameter smaller than the minimum diameter of the first internal thread portion and larger than the inner diameter of the reduced diameter portion, and can abut against the reduced diameter portion in the embedding direction. The second external thread portion is located on the rear side of the abutment portion in the embedding direction and engages with the second internal thread portion.

[0086] According to the atomic absorption spectrophotometer described in item 1, the support can be approached from one side of the support's disassembly / reassembly direction to disassemble / reassemble the support.

[0087] (Item 2)

[0088] According to the atomic absorption spectrophotometer described in item 1, where,

[0089] The atomic absorption spectrophotometer also includes a pair of coils disposed on both sides of the tube along an axial direction intersecting the embedding direction.

[0090] The pair of coils can apply a magnetic field to the tube located between the pair of coils.

[0091] According to the atomic absorption spectrophotometer described in item 2, when using the Zeeman split correction method, the support can be accessed and disassembled from one side of the disassembly / reassembly direction between a pair of coils.

[0092] (Item 3)

[0093] According to the atomic absorption spectrophotometer described in item 1 or 2, wherein,

[0094] The atomic absorption spectrophotometer also includes a spring that applies force to the movable part in the embedding direction.

[0095] By screwing the second external thread into the second internal thread while the abutting part is in contact with the reduced diameter part, the movable part moves from the front side to the rear side in the embedding direction against the force of the spring.

[0096] According to the atomic absorption spectrophotometer described in item 3, when analyzing the sample, the first support and the movable part can be made to be in a state where they do not contact each other, thus suppressing the heat generated by the first support from being dispersed to the movable part.

[0097] (Item 4)

[0098] According to the atomic absorption spectrophotometer described in any one of items 1 to 3, among which,

[0099] The space inside the inner circumferential surface of the fixed part is connected to the pipe via the space inside the inner circumferential surface of the movable part and the through hole of the bracket.

[0100] According to the atomic absorption spectrophotometer described in item 4, the oxidation prevention performance of the tube can be maintained by directly blowing an inactive gas into the tube through the interior of the fixed part and the movable part.

[0101] Furthermore, the embodiments disclosed herein are illustrative in all respects and do not constitute a basis for limiting interpretation. Therefore, the scope of protection of this disclosure is not limited to the above-described embodiments. Additionally, all modifications within the meaning and scope equivalent to the claims are included. In the description of the above embodiments, combinable structures may also be combined with each other.

[0102] Explanation of reference numerals in the attached figures

[0103] 1. Atomic absorption spectrophotometer; 10. Sample heating section; 20. Coil; 30. Pusher; 31. Rod; 32. Sample injection port; 40. Base; 41. Sliding mechanism; 42. Support platform; 100. Tube; 101. Sample injection port; 110. Support; 120. First support; 120a. Imaginary shaft; 121. Through hole; 130. Second support; 140. Block; 141. First block; 143. Positioning pin; 145. Second block; 150. Gas inlet; 151. Cap; 17 0. Fixed part; 171. Sleeve; 172. First internal thread part; 173. Reduced diameter part; 174. Gas inlet part; 175, 185. Round tube part; 176, 186. Flange part; 180. Movable part; 182. Internal thread component; 183. Second internal thread part; 190. Spring; 200. First bolt; 201. First external thread part; 202. First shaft part; 203. Second shaft part; 210. Second bolt; 211. Abutment part; 212. Second external thread part; 220. Clamp block.

Claims

1. An atomic absorption spectrophotometer, wherein a retaining tube and a support having a through hole are detachably embedded in a block, and an electric current flows through the tube, thereby heating a sample, wherein... This atomic absorption spectrophotometer has the following features: A fixing part is provided about an axis about an imaginary axis extending along the embedding direction of the bracket relative to the block, located at a position separated from the bracket in the embedding direction, and fixed relative to the block; as well as A movable part, which is arranged about the axis of the imaginary axis, is located at the front side of the insertion direction relative to the bracket, and is configured to move along the imaginary axis outside the fixed part so as to abut against the bracket from the front side of the insertion direction. On the inner circumferential surface of the fixing part, a first internal thread portion is formed from the rear end of the fixing part in the insertion direction toward the front side, and a reduced diameter portion is formed relative to the first internal thread portion located at the front side in the insertion direction and having an inner diameter smaller than the minimum diameter of the first internal thread portion. On the inner circumferential surface of the movable part, a second internal thread portion having a minimum diameter larger than the maximum diameter of the first internal thread portion is formed from the rear end of the movable part in the insertion direction toward the front side. By inserting a first bolt, comprising a first external thread and a shaft portion, into the through hole from the embedding direction, and screwing the first external thread into the first internal thread, the bracket can be pushed from the rear side to the front side in the embedding direction using the first bolt. The first external thread is located on the front side in the embedding direction and has a maximum diameter smaller than the minimum diameter of the second internal thread and engages with the first internal thread. The shaft portion is located on the rear side of the first external thread in the embedding direction and has an outer diameter smaller than the minimum diameter of the second internal thread. By inserting a second bolt, including an abutment portion and a second external thread portion, into the through hole from the embedding direction, and screwing the second external thread portion into the second internal thread portion while the abutment portion abuts against the reduced diameter portion, the bracket can be pushed from the front side to the rear side in the embedding direction using the movable portion that moves toward the bracket. The abutment portion is located on the front side in the embedding direction and has an outer diameter smaller than the minimum diameter of the first internal thread portion and larger than the inner diameter of the reduced diameter portion, and can abut against the reduced diameter portion in the embedding direction. The second external thread portion is located on the rear side of the abutment portion in the embedding direction and engages with the second internal thread portion.

2. The atomic absorption spectrophotometer according to claim 1, wherein, The atomic absorption spectrophotometer also includes a pair of coils disposed on both sides of the tube along an axial direction intersecting the embedding direction. The pair of coils can apply a magnetic field to the tube located between the pair of coils.

3. The atomic absorption spectrophotometer according to claim 1 or 2, wherein, The atomic absorption spectrophotometer also includes a spring that applies force to the movable part in the embedding direction. By screwing the second external thread into the second internal thread while the abutting part is in contact with the reduced diameter part, the movable part moves from the front side to the rear side in the embedding direction against the force of the spring.

4. The atomic absorption spectrophotometer according to any one of claims 1 to 3, wherein, The space inside the inner circumferential surface of the fixed part is connected to the pipe via the space inside the inner circumferential surface of the movable part and the through hole of the bracket.

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