阅读说明：本技术 柱塞泵的制造方法、柱塞泵 (Plunger pump manufacturing method and plunger pump ) 是由 佐野恵一 于 2020-03-16 设计创作，主要内容包括：柱塞泵的制造方法包括：温度差产生工序,在温度差产生工序中,使外侧气缸和内侧气缸中的任一方从常温状态产生温度差；气缸插入工序,在气缸插入工序中,将因通过温度差产生工序产生的温度差而外径比外侧气缸的内径短的状态的内侧气缸,插入外侧气缸的内侧；去除工序,在去除工序中,去除所产生的温度差；以及柱塞配置工序,在柱塞配置工序中,在内侧气缸的加压室以能够往复运动的方式配置圆筒状的柱塞。(The manufacturing method of the plunger pump comprises the following steps: a temperature difference generating step of generating a temperature difference from a normal temperature state in either one of the outer cylinder and the inner cylinder; a cylinder insertion step of inserting the inner cylinder having an outer diameter shorter than the inner diameter of the outer cylinder due to the temperature difference generated in the temperature difference generation step, into the inner side of the outer cylinder; a removal step of removing the temperature difference generated in the removal step; and a plunger arranging step of arranging a cylindrical plunger so as to be capable of reciprocating in the pressure chamber of the inner cylinder.)

1. A method for manufacturing a plunger pump that is connected to a ultrafinely shattering apparatus having a ultrafinely shattering passage through which a sample is ultrafinely shattered, and supplies the sample to the ultrafinely shattering apparatus at a high pressure, the plunger pump including an outer cylinder and an inner cylinder having a cylindrical pressurizing chamber formed therein, the method comprising:

a temperature difference generating step of generating a temperature difference from a normal temperature state in either one of the outer cylinder and the inner cylinder;

a cylinder insertion step of inserting an inner cylinder having an outer diameter smaller than an inner diameter of the outer cylinder due to the temperature difference generated in the temperature difference generation step, into an inner side of the outer cylinder;

a removing step of removing the generated temperature difference; and

a plunger arranging step of arranging a cylindrical plunger in a pressure chamber of the inner cylinder so as to be capable of reciprocating.

2. The method of manufacturing a plunger pump according to claim 1, wherein the temperature difference generating step includes a heating step of heating the outer cylinder,

in the cylinder insertion step, the inner cylinder is inserted into an outer cylinder having an inner diameter longer than an outer diameter of the inner cylinder,

the removing step includes a cooling step of cooling the outer cylinder.

3. The method of manufacturing a plunger pump according to claim 1, wherein the temperature difference generating step includes a cooling step of cooling the inner cylinder,

in the cylinder insertion step, an inner cylinder having an outer diameter smaller than an inner diameter of the outer cylinder is inserted into the outer cylinder,

the removing step includes a heating step of heating the inner cylinder.

4. The method of manufacturing a plunger pump according to claim 1,

the temperature difference generating step includes:

a heating step of heating the outer cylinder, and

a cooling step of cooling the inner cylinder,

in the cylinder insertion step, the inner cylinder is inserted into an outer cylinder having an inner diameter longer than an outer diameter of the inner cylinder,

the removing process includes:

a cooling step of cooling the outer cylinder, and

and a heating step of heating the inner cylinder.

5. The method of manufacturing a plunger pump according to any one of claims 2 to 4, wherein, in the cylinder insertion process,

the inner cylinder is pressed into the inner side of the outer cylinder.

6. A plunger pump that is connected to a ultrafinely shattering apparatus having a ultrafinely shattering passage for ultrafinely shattering a sample by passing the sample through the ultrafinely shattering apparatus and supplies the sample to the ultrafinely shattering apparatus at a high pressure, the plunger pump comprising:

an outside cylinder;

an inner cylinder inserted into the outer cylinder and having a cylindrical compression chamber formed therein; and

a plunger disposed in a pressure chamber of the inner cylinder so as to be capable of reciprocating,

the inner cylinder is configured to be pressed by the outer cylinder.

Technical Field

The disclosure relates to a plunger pump and a manufacturing method thereof.

Background

Conventionally, a micronizing device unit is known as a homogenizer unit for micronizing and homogenizing a sample.

As such a micronizer unit, for example, japanese patent No. 3149371 discloses the following structure: the sample is homogenized by supplying the sample supplied from the container into the atomization passage of the atomization device by a high-pressure pump.

Disclosure of Invention

Problems to be solved by the invention

However, in the solution described in the above document, there is a problem that the cylinder forming the pump deteriorates and fatigues due to the pressure applied to the sample by the pump.

The present disclosure has been made in view of the above problems, and an object thereof is to provide a method for manufacturing a plunger pump for improving durability against an internal pressure of a sample by the pump, and a plunger pump manufactured by the manufacturing method.

Means for solving the problems

In order to solve the above problems, a method of manufacturing a plunger pump according to an aspect of the present disclosure is a method of manufacturing a plunger pump that is connected to a ultrafinely shattering apparatus having a ultrafinely shattering chamber for ultrafinely shattering a sample by passing the sample through the ultrafinely shattering chamber, and supplies the sample to the ultrafinely shattering apparatus at a high pressure, the plunger pump including an outer cylinder and an inner cylinder having a cylindrical pressurizing chamber formed therein, the method including: a temperature difference generating step of generating a temperature difference from a normal temperature state in either one of the outer cylinder and the inner cylinder; a cylinder insertion step of inserting the inner cylinder having an outer diameter shorter than the inner diameter of the outer cylinder due to the temperature difference generated in the temperature difference generation step, into the inner side of the outer cylinder; a removal step of removing the temperature difference generated in the removal step; and a plunger arranging step of arranging a cylindrical plunger so as to be capable of reciprocating in the pressure chamber of the inner cylinder.

In the above manufacturing method, the temperature difference generating step may include a heating step of heating the outer cylinder, the cylinder inserting step may insert the inner cylinder into the outer cylinder having an inner diameter longer than an outer diameter of the inner cylinder, and the removing step may include a cooling step of cooling the outer cylinder.

In the above manufacturing method, the temperature difference generating step may include a cooling step of cooling the inner cylinder, the inner cylinder having an outer diameter smaller than an inner diameter of the outer cylinder may be inserted into the outer cylinder in the cylinder inserting step, and the removing step may include a heating step of heating the inner cylinder.

In the above manufacturing method, the temperature difference generating step may include a heating step of heating the outer cylinder and a cooling step of cooling the inner cylinder, the cylinder inserting step may insert the inner cylinder into the outer cylinder having an inner diameter longer than an outer diameter of the inner cylinder, and the removing step may include a cooling step of cooling the outer cylinder and a heating step of heating the inner cylinder.

In the cylinder insertion step of the above-described manufacturing method, the inner cylinder may be press-fitted into the outer cylinder.

In order to solve the above-mentioned problems, a plunger pump according to an aspect of the present disclosure is connected to a ultrafinely shattering apparatus having a ultrafinely shattering channel for ultrafinely shattering a sample by passing the sample through the ultrafinely shattering apparatus, and supplies the sample to the ultrafinely shattering apparatus at a high pressure, the plunger pump including: an outside cylinder; an inner cylinder inserted into the outer cylinder and having a cylindrical compression chamber formed therein; and a plunger in which a cylindrical plunger is disposed in a pressure chamber of the inner cylinder so as to be capable of reciprocating, the inner cylinder being configured to be pressed by the outer cylinder.

Effects of the invention

The method of manufacturing a plunger pump according to the present disclosure is a method of manufacturing a plunger pump having a cylinder constituted by an outer cylinder and an inner cylinder, and changes the size by changing the temperature of the outer cylinder or the inner cylinder from a normal temperature state to a different temperature, during which the inner cylinder is inserted into the outer cylinder. Therefore, when the state is returned to the normal temperature, the outer cylinder can be configured to be in a state in which the outer cylinder always applies an external pressure to the inner cylinder, and therefore, the metal fatigue of the cylinder configuring the plunger can be suppressed against the internal pressure of the sample passing through the inside of the cylinder.

Drawings

FIG. 1 is a conceptual diagram showing an example of the structure of a ultrafinely shattering apparatus.

FIG. 2 is a sectional view showing the structure of an orifice homogenizer.

FIG. 3 is a radial cross-sectional view of an orifice homogenizer.

Fig. 4 is an enlarged schematic view of the plunger pump.

Fig. 5 is a flowchart showing a manufacturing method of the plunger pump.

Fig. 6 (a) to (d) are schematic diagrams showing a manufacturing process of the plunger pump.

Fig. 7 (a) to (c) are schematic views showing a manufacturing process of the plunger pump following fig. 6.

Fig. 8 is a flowchart showing another manufacturing method of the plunger pump.

Fig. 9 (a) to (d) are schematic views showing other manufacturing processes of the plunger pump.

Fig. 10 (a) to (c) are schematic views showing other manufacturing processes of the plunger pump following fig. 9.

Detailed Description

A method of manufacturing a plunger pump and a plunger pump according to an aspect of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a conceptual diagram schematically showing a structural example of a micronizing device unit 1 using a plunger pump. As shown in FIG. 1, the ultrafinely shattering apparatus unit 1 is a homogenizer unit for ultrafinely shattering and homogenizing a sample. The ultrafinely shattering apparatus unit 1 includes a ultrafinely shattering apparatus 10, a supply tank 30, a take-out tank 31, and a pipe 40, a pipe 41, a pipe 42, and a pipe 43 connecting them.

The ultrafinely shattering apparatus 10 includes a ultrafinely shattering passage for allowing the sample to pass therethrough to ultrafinely shatter the sample. The micronizing device 10 is also called orifice homogenizer or simply orifice homogenizer. The structure of the ultrafinely shattering apparatus 10 will be described in detail with reference to FIGS. 2 and 3.

FIG. 2 is a longitudinal sectional view of the ultrafinely shattering apparatus 10, wherein a sectional view taken along line A-A of FIG. 2 is shown in FIG. 3 (a), a sectional view taken along line B-B of FIG. 2 is shown in FIG. 3 (B), and a sectional view taken along line C-C of FIG. 2 is shown in FIG. 3 (C).

The ultrafinely shattering apparatus 10 includes a first block 21, a second block 22, and a third block 23 interposed between the first block 21 and the second block 22. A plurality of passage portions 11 and 12 are formed in the first block 21 (see fig. 2 and 3 (a)). Further, a plurality of passage portions 18 and 19 are also formed in the second block 22.

The first void portion 14 is intentionally formed on the joining surface of the first block 21 and the third block 23. The first gap 14 is a collection portion 13 that singly collects the plurality of passage portions 11 and 12 (see fig. 2 and 3 (b)). On the opposite side of the channel portion 11, 12 in the channel direction in the collective portion 13 (first gap portion 14) is a third block 23, and an apertured channel portion 15 is formed in the third block 23 (see fig. 2 and 3 (c)).

On the downstream side of the orifice passage portion 15, a second void portion 16 is also intentionally formed on the joining surface of the third block 23 and the second block 22. The second gap portion 16 is a branch portion 17 that branches the orifice passage portion 15 and connects to the plurality of passage portions 18 and 19. That is, the microparticulation channel includes a channel portion 11, a channel portion 12, an orifice channel portion 15, and channel portions 18, 19.

The inner diameters (D1) of the passage portions 11, 12, 18, and 19 are the same as each other and are formed larger than the inner diameter (D2) of the orifice passage portion 15. Specifically, the inner diameter (D1) is 5 to 7 times the inner diameter (D2). The distance (D3) of the first gap portion 14 is defined to be equal to the inner diameter (D1). Therefore, the orifice passage portion 15 is a small-diameter passage portion.

Next, the operation of the ultrafinely shattering apparatus 10 will be described. The sample obtained by dispersing the object to be treated in the organic solvent enters the collecting portion 13 (first gap portion 14) through the channel portions 11 and 12. Here, the flow rate of the sample is reduced because the orifice passage portion 15 is narrower than the passage portion 11 and the passage portion 12. Then, the pressure of the sample (pressure-fed fluid) changes, and the samples flowing in from the respective channel portions 11 and 12 collide with the collecting portion 13. At this time, the objects to be processed in the sample are crushed by the energy at the time of collision. In this way, each time the sample flows from the channel portion 11 and the channel portion 12 to the orifice channel portion 15, the collision between the objects to be processed in the sample is strengthened, and as a result, the sample is crushed.

Although two channel portions 11, 12, 18, and 19 are shown, the number of channel portions 11, 12, 18, and 19 may be one or more, as long as the sample flows. However, in order to promote the collision of the object to be processed in the sample, it is more preferable that the number of the channel portions 11, 12, 18, and 19 is 2 or more.

Returning to FIG. 1, the supply container 30 supplies the sample to the microparticulation channel. The supply vessel 30 is provided on the most upstream side of the atomization channel, and is connected to a valve 71 via a pipe 40 as shown in the figure. The supply container 30 is filled with the sample before the microparticulation and the sample that has not been sufficiently microparticulated after passing through the microparticulation channel as shown by the arrow in fig. 1. In fig. 1, the detailed structure from the take-out container 31 to the supply container 30 is omitted.

The take-out container 31 is a container for taking out the sample after the sample is completely homogenized.

The ultrafinely shattering apparatus unit 1 may be configured not to include (may include) the extraction container 31 and to extract the homogenized sample from the piping 40 through the drain pipe 86 or the like. Fig. 1 shows a structure including both the extraction container 31 and the drain pipe 86.

The plunger pump 51 is connected to the valve 71 and the atomization device 10 via the pipe 40. By opening the valve 71, the sample from the supply container 30 can be made to flow into the pipe 41, and by closing the valve 71, the sample from the supply container 30 can be prevented from flowing out to the pipe 41, and the sample pushed out by the plunger pump 51 can be prevented from flowing back toward the supply container 30.

The plunger pump 51 is constituted by a cylinder 51A and a plunger 51B. By reciprocating the plunger inside the cylinder, the sample can be filled into the cylinder and the sample in the cylinder can be sent out to the outside. Fig. 4 is an enlarged schematic view of the plunger pump 51.

Fig. 4 is a partial sectional view of the plunger pump, which is a conceptual diagram. Fig. 4 shows a schematic enlarged view of the plunger pump 51, but the plunger pumps 52 and 53 have the same structure. In the plunger pump according to the present embodiment, as shown in fig. 4, the cylinder 51A includes an inner cylinder 51A and an outer cylinder 51 b. That is, the cylinder 51A has a double-layer configuration. In the cylinder 51A, the inner cylinder 51A is configured to be always externally pressed by the outer cylinder 51 b. That is, in a state where the inner cylinder 51a is not inserted into the outer cylinder 51b, a member having an outer diameter larger than an inner diameter of the outer cylinder 51b is used as the inner cylinder 51 a. That is, the cylinder 51A is configured in a state in which the inner cylinder 51A is pressed by the outer cylinder 51 b. The inner cylinder 51a is preferably made of a material having higher (harder) hardness than the outer cylinder 51b, and SUS630 is used as an example, but not limited thereto. The outer cylinder 51b is preferably made of a material slightly softer than the inner cylinder 51a, having elasticity, and having a function of fastening the inner cylinder 51a, and for example, SUS316 or the like is used.

A plunger 51B reciprocating inside the cylinder 51A is inserted into the cylinder 51A and disposed. The plunger 51B reciprocates in the direction of the arrow shown in fig. 4 by the rotation of the crank mechanism. Thus, the plunger pump 51 can suck the sample from the pipe 41 and can press the sample into the pipe 41.

The atomization device 10 is also connected to a valve 73 and a valve 75 via a pipe 43. By opening the valve 73, the sample from the ultrafinely shattering apparatus 10 can be made to flow into the pipe 43, and by closing the valve 73, the sample from the ultrafinely shattering apparatus 10 can be prevented from flowing out into the pipe 43. Further, the sample from the ultrafinely shattering apparatus 10 can be made to flow into the drain 86 by opening the valve 75, and the sample from the ultrafinely shattering apparatus 10 can be prevented from flowing out to the drain 86 side by closing the valve 75.

The valve 73 is connected to the pipe 43, and the pipe 43 is connected to the extraction container 31. The heat exchanger 80 may be provided in the pipe 43, and when the sample has heat, the heat may be removed by the atomization process of the atomization device 10.

The atomization device unit 1 may further include a control unit (not shown) that controls opening and closing of the plunger pump 51 and the valves 71, 73, 75. The control unit controls the plunger pump 51 and the valves 71, 73, and 75 in the ultrafinely shattering apparatus unit 1 to open and close so that the sample circulates through the ultrafinely shattering path and flows through the ultrafinely shattering path until the sample reaches a target particle size.

The procedure of the process for ultrafinely shattering a sample in the ultrafinely shattering apparatus unit 1 having the above-mentioned structure will be described.

First, the object to be treated is dispersed in an organic solvent to form a sample. The dispersion is carried out in the supply container 30.

Examples of the object to be miniaturized include various substances such as cellulose, graphite, graphene, carbon nanotubes, and composite metal oxides (such as spinel and perovskite crystals). The dispersion is miniaturized, and thereby, uniform dispersibility when mixed with a resin or the like is improved. Therefore, the properties of the material are expected to be improved.

Next, the valve 71 is opened, and the plunger 51B is pulled out from the cylinder 51A, whereby the sample is filled in the cylinder 51A of the plunger pump 51. Then, the plunger 51B is pushed into the cylinder 51A with the valve 71 closed, whereby the sample is supplied to the atomization device 10 through the pipe 41 (pushed out at high pressure).

When the atomization of the sample is insufficient, the valve 73 is opened and the valve 75 is closed at the timing when the plunger 51B is pressed in. The sample atomized (homogenized) by the atomization device 10 having the above-described structure is supplied to the take-out container 31 through the pipe 42, the valve 73, and the pipe 43. At this time, when the sample passes through the pipe 43, heat may be removed by the heat exchanger 80 as necessary. Then, the sample supplied to the extraction container 31 is supplied again to the supply container 30, and the microparticulation treatment is performed.

By repeating this action several times, the sample passes through the microparticulation channel several times. That is, the sample is micronized over a plurality of times, and homogenization of the sample is achieved. The process may be executed by a control unit provided in the atomization device unit 1, or may be executed by a control unit that receives an instruction from an operator.

On the other hand, when the atomization of the sample is sufficient, the sample supplied to the extraction container 31 may be extracted, or the sample may be extracted from the drain pipe 86 by closing the valve 73 and opening the valve 75 at the timing of pressing the plunger 51B.

< method for producing plunger Pump >

Fig. 5 is a flowchart illustrating a method of manufacturing the plunger pump shown in fig. 4. Fig. 6 and 7 are schematic views illustrating the manufacturing process of the plunger pump in the sequence shown in fig. 5. Referring to fig. 5 to 7, a method of manufacturing the plunger pump 51 will be explained. In manufacturing the plunger pump 51, the inner cylinder 51a is inserted into the outer cylinder 51b by generating a temperature difference in either the outer cylinder 51b or the inner cylinder 51a from a normal temperature state to make the size larger (or smaller) than usual. In embodiment 1, the insertion of the inner cylinder 51a is achieved by heating the outer cylinder 51b to expand its size. Hereinafter, the description will be specifically made.

First, as shown in fig. 6 (a), an inner cylinder 51a and an outer cylinder 51b are prepared, in which the outer diameter of the inner cylinder 51a is equal to or larger than the inner diameter of the outer cylinder 51b, as the inner cylinder 51a and the outer cylinder 51 b. The outer cylinder 51b is made of a thermally expansive material.

Then, the prepared outside cylinder 51b is subjected to heat treatment (step S501 in fig. 5). As shown in fig. 6 (b), only the outer cylinder 51b is subjected to heat treatment. In the heating process, the outside cylinder 51b expands and is heated to such an extent that the outside cylinder 51b is not damaged by heat. By performing this heating treatment, the outer cylinder 51b thermally expands as indicated by the arrow in fig. 6 (c). As a result, the inner diameter of the outer cylinder 51b is enlarged (expanded). Therefore, the inner cylinder 51a can be easily press-fitted into the outer cylinder 51 b.

Therefore, as shown in fig. 6 (d), the inner cylinder 51a is inserted (press-fitted) into the interior of the thermally expanded outer cylinder 51b (see also step S502 of fig. 5). Fig. 7 (a) shows the cylinder 51A in a state where the insertion of the inner cylinder 51A into the inside of the outer cylinder 51b is completed.

After the insertion of the inner cylinder 51a into the outer cylinder 51b is completed, the outer cylinder 51b is cooled to return the expanded outer cylinder 51b to the original state, i.e., the unexpanded state (see step S503 of fig. 5 and (b) of fig. 7). As the cooling process, if metal fatigue due to heating and cooling of the outer cylinder 51b is considered, natural cooling is preferable, but not limited thereto. That is, the cooling process may be a process of artificially cooling the outer cylinder 51b, or may be a natural cooling process. As an artificial cooling method, for example, it is conceivable to immerse the cylinder 51A in a water tank filled with water, but any method may be used as long as cooling can be performed without damaging the outer cylinder 51 b.

The outside cylinder 51b is cooled to return to its original size. Therefore, the cylinder 51A has a structure in which the outer cylinder 51b always fastens the inner cylinder 51A from the outside of the inner cylinder 51A. On the other hand, in the cylinder 51A, when the ultrafinely shattering apparatus is operated, the sample flows inside under high pressure. Therefore, although the sample applies outward pressure to the cylinder, which results in metal fatigue of the cylinder, in the case of the cylinder 51A according to the present embodiment, external pressure is applied from the outer cylinder 51b to the inner cylinder 51A. The external pressure from the outer cylinder 51b is opposed to the internal pressure generated by the sample flowing inside the inner cylinder 51a, and the pressure applied to the inner cylinder 51a is dispersed. Therefore, as shown in the present embodiment, the cylinder 51A is provided in a double-layer structure, and the outer cylinder 51b is provided to apply an external pressure to the inner cylinder 51A, so that the resistance to the internal pressure of the sample flowing inside can be improved as compared with the conventional structure, and the fatigue level can be reduced as compared with the conventional structure.

When the cooling of the outside cylinder 51B is completed, next, the plunger 51B is inserted into the cylinder 51A (see step S504 of fig. 5, fig. 7 (c)). Thereby, the plunger pump 51 can be manufactured.

< embodiment 2>

In embodiment 1, the outer cylinder 51b is heated and expanded, the inner cylinder 51a is inserted, and then the outer cylinder 51b is cooled and restored to its original size, thereby applying external pressure to the inner cylinder 51 a. In embodiment 2, another example of the method for manufacturing the cylinder 51A will be described.

In embodiment 1 described above, the outer cylinder 51b is heated to have a larger size than usual, and the inner cylinder 51a can be inserted, but in embodiment 2, a manufacturing method in which the inner cylinder 51a is reduced in size and the outer cylinder 51b can be inserted will be described.

Fig. 8 is a flowchart showing a method of manufacturing the plunger pump 51 according to embodiment 2. Fig. 9 and 10 are schematic views of the manufacturing method of the flowchart shown in fig. 8.

First, as shown in fig. 9 (a), an inner cylinder 51a and an outer cylinder 51b are prepared in which the outer diameter of the inner cylinder 51a is equal to or larger than the inner diameter of the outer cylinder 51b as the inner cylinder 51a and the outer cylinder 51 b. A material that shrinks in size due to cooling is used in the inner cylinder 51 a.

Then, the prepared inner cylinder 51a is subjected to cooling processing (step S801 in fig. 8). As shown in fig. 8 (b), the cooling process is performed only on the inner cylinder 51 a. In the cooling process, the inner cylinder 51a contracts, and the inner cylinder 51a is cooled to such an extent that it is not damaged (does not deteriorate) by the cooling. By performing this cooling process, the inner cylinder 51a contracts as indicated by the arrow in fig. 9 (c). As a result, the outer diameter of the inner cylinder 51a contracts (shortens). Therefore, the inner cylinder 51a can be easily press-fitted into the outer cylinder 51 b.

Therefore, as shown in fig. 9 (d), the contracted inner cylinder 51a is inserted (press-fitted) into the inside of the outer cylinder 51b (see also step S802 of fig. 8). Fig. 10 (a) shows the cylinder 51A in a state where the insertion of the inner cylinder 51A into the outer cylinder 51b is completed.

After the insertion of the inner cylinder 51a into the outer cylinder 51b is completed, the inner cylinder 51a is subjected to a heating process in order to return the contracted inner cylinder 51a to the original state, i.e., to an uncontracted state (see step S803 of fig. 8 and (b) of fig. 10). As the heating treatment, if metal fatigue due to cooling or heating of the inner cylinder 51a is considered, natural heating (waiting for natural temperature to be reached) is preferable, but the present invention is not limited thereto. That is, the heating process may be performed by artificially heating the inner cylinder 51 a. As an artificial cooling method, for example, it is conceivable to immerse the cylinder 51A in a bathtub filled with hot water, but any method may be used as long as heating can be performed without damaging the inner cylinder 51A. In this case, the outer cylinder 51b is preferably not expanded by the heat treatment.

The inner cylinder 51a is heated to return to its original size. On the other hand, the outer cylinder 51b itself maintains the original size. Therefore, the cylinder 51A has a structure in which the outer cylinder 51b always fastens the inner cylinder 51A from the outside of the inner cylinder 51A. On the other hand, in the cylinder 51A, when the ultrafinely shattering apparatus is operated, the sample flows inside under high pressure. Therefore, although the sample applies outward pressure to the cylinder, which results in metal fatigue of the cylinder, in the case of the cylinder 51A according to the present embodiment, external pressure is applied from the outer cylinder 51b to the inner cylinder 51A. The external pressure from the outer cylinder 51b is opposed to the internal pressure generated by the sample flowing inside the inner cylinder 51a, and the pressure applied to the inner cylinder 51a is dispersed. Therefore, as shown in the present embodiment, the cylinder 51A is provided in a double-layer structure, and the outer cylinder 51b is provided to apply an external pressure to the inner cylinder 51A, so that the resistance to the internal pressure of the sample flowing inside can be improved as compared with the conventional structure, and the degree of metal fatigue of the cylinder 51A can be reduced as compared with the conventional structure.

When the heating of the inner cylinder 51A is completed, next, the plunger 51B is inserted into the cylinder 51A (see step S804 of fig. 8, fig. 10 (c)). Thereby, the plunger pump 51 can be manufactured.

< modification example >

In embodiment 1 described above, the inner cylinder 51a is inserted into the outer cylinder 51b by expanding the outer cylinder 51b by the heating process, and in embodiment 2, the inner cylinder 51a is inserted into the outer cylinder 51b by contracting the inner cylinder 51a by the cooling process. However, the inner cylinder 51a may be inserted into the outer cylinder 51b having an inner diameter smaller than the outer diameter of the inner cylinder 51a, and a method other than the heating treatment or the cooling treatment may be used. For example, the outer cylinder 51b may be mechanically gripped, and the inner cylinder 51a may be pressed into the outer cylinder 51b by a robot or the like. The inner cylinder 51A is press-fitted into the outer cylinder 51b, whereby the same structure as the cylinder 51A described in embodiments 1 and 2 can be realized.

Further, by manufacturing the cylinder 51A by the above-described method, a structure is realized in which the outer cylinder 51b applies pressure to the inner cylinder 51A in a steady state. As described above, this is a structure for coping with the internal pressure in the inner cylinder 51a during the operation of the ultrafinely shattering apparatus, but it may be realized by another structure as long as the structure is such that the external pressure is applied to the inner cylinder 51 a. For example, a device for applying external pressure to the cylinder 51A may be added when the ultrafinely shattering apparatus is operated. For example, the following structure is possible: the cylinder 51A may be externally pressed by a device for applying a hydraulic pressure when the ultrafinely shattering apparatus is operated, or the cylinder 51A may be externally pressed by a device such as a vice.

< summary >

As described above, according to the plunger pump manufacturing method and the plunger pump according to the above-described embodiments, it is possible to provide a plunger pump having the cylinder 51A in which the outer cylinder 51b always applies an external pressure to the inner cylinder 51A. Therefore, by opposing the pressure applied from the outer cylinder 51b to the inner cylinder 51A against the internal pressure of the sample flowing at a high pressure in the cylinder 51A of the plunger pump 51, the degree of fatigue of the cylinder 51A can be reduced compared to the conventional one.

In the above-described embodiment, the sample is caused to flow only in one direction in the ultrafinely shattering apparatus unit 1, but a structure in which the sample reciprocates in the ultrafinely shattering apparatus 10 may be employed. That is, in FIG. 1, another plunger pump may be provided at a position where the water discharge pipe 86 is provided, and the sample may be reciprocated in the ultrafinely shattering apparatus 10.

The structure of the channel of the ultrafinely shattering apparatus 10 may be changed as desired.

Further, the present invention is not limited to the above-described modifications, and these modifications may be selected and appropriately combined, or other modifications may be implemented.

The disclosure of japanese patent application No. 2019-55719, filed 3, 22, 2019, is incorporated by reference in its entirety.

All documents, patent applications, and technical standards cited in this application are incorporated by reference to the same extent as if the individual documents, patent applications, and technical standards were specifically and individually described to be incorporated by reference.