Liquefied fluid supply system and liquefied fluid injection device
阅读说明:本技术 液化流体供给系统和液化流体喷射装置 (Liquefied fluid supply system and liquefied fluid injection device ) 是由 前野润 定木启 乡田玲央奈 河原伸哉 于 2019-01-29 设计创作,主要内容包括:该液化流体供给系统(3)是将在喷射后汽化的液化流体(X)供给至喷嘴(4)的液化流体供给系统,具备:过冷部(5),其将上述液化流体冷却至比饱和温度更低温而成为过冷液;和升压部(6),其将通过上述过冷部成为过冷液的上述液化流体升压并供给至上述喷嘴。(The liquefied fluid supply system (3) supplies a liquefied fluid (X) vaporized after injection to a nozzle (4), and is provided with: an supercooling unit (5) that cools the liquefied fluid to a temperature lower than a saturation temperature to obtain a supercooled liquid; and a pressure increasing unit (6) that increases the pressure of the liquefied fluid that has been turned into a supercooled liquid by the supercooling unit and supplies the liquid to the nozzle.)
1. A liquefied fluid supply system for supplying a liquefied fluid vaporized after injection to a nozzle, the liquefied fluid supply system comprising:
an supercooling unit that cools the liquefied fluid to a temperature lower than a saturation temperature to become a supercooled liquid; and
and a pressure increasing unit that increases the pressure of the liquefied fluid that has been converted into the supercooled liquid by the supercooling unit and supplies the liquefied fluid to the nozzle.
2. The liquefied fluid supply system according to claim 1, wherein the subcooling section cools the liquefied fluid so that the liquefied fluid becomes a degree of subcooling not exceeding a saturation temperature at the time of supply to the pressure-raising section and at the time of pressure-raising at the pressure-raising section.
3. The liquefied fluid supply system according to claim 1 or 2, wherein the subcooling section includes a subcooling section heat exchanger that cools the liquefied fluid supplied to the pressure-increasing section by heat exchange with a cooling liquefied fluid that is lower in temperature than the liquefied fluid.
4. The liquefied fluid supply system according to claim 3, wherein the subcooling unit includes a subcooling booster pump that pressure-feeds the liquefied fluid to the pressure-increasing unit.
5. The liquefied fluid supply system of claim 4, wherein the subcooling booster pump is housed in the subcooling section heat exchanger.
6. The liquefied fluid supply system according to any one of claims 3 to 5, wherein the supercooling unit includes:
a discharge pipe connected to a storage tank that stores the liquefied fluid;
a pressure increasing unit supply pipe that connects the subcooling unit heat exchanger and the discharge pipe and guides the liquefied fluid supplied to the pressure increasing unit to the subcooling unit heat exchanger;
a cooling pipe that connects the subcooling portion heat exchanger and the discharge pipe and guides the liquefied fluid to the subcooling portion heat exchanger as the cooling liquefied fluid; and
and a cooling pipe resistance section provided at an intermediate portion of the cooling pipe and serving as resistance of the cooling liquefied fluid.
7. The liquefied fluid supply system according to claim 6, comprising:
a post-pressure-increasing cold heat exchanger that cools the liquefied fluid that is pressure-increased by the pressure-increasing section;
a post-cooling pipe that connects the post-pressure-increasing cooling heat exchanger and the discharge pipe and guides the liquefied fluid to the post-pressure-increasing cooling heat exchanger as a post-cooling liquefied fluid; and
and a post-cooling piping resistance part which is provided at an intermediate portion of the post-cooling piping and which serves as resistance of the post-cooling liquefied fluid.
8. The liquefied fluid supply system according to any one of claims 3 to 7, wherein the pressure-increasing section includes:
a booster pump that boosts the liquefied fluid;
a return pipe that returns a part of the liquefied fluid boosted in pressure by the booster pump to the supercooling unit as the liquefied fluid for cooling; and
and a return pipe resistance section provided at an intermediate portion of the return pipe and serving as resistance of the liquefied fluid to return of the cooling liquefied fluid.
9. The liquefied fluid supply system according to claim 8, wherein the pressure-increasing unit includes a return flow amount limiting mechanism that is provided at an intermediate position of the return pipe and that adjusts a flow rate of the liquefied fluid flowing through the return pipe.
10. The liquefied fluid supply system according to any one of claims 1 to 9, wherein the pressure-increasing portion includes: a primary pressure-increasing pump that increases the pressure of the liquefied fluid supplied from the supercooling unit; and a secondary booster pump that boosts the pressure of the liquefied fluid once.
11. The liquefied fluid supply system according to any one of claims 1 to 9, wherein the pressure increasing section includes a single-stage pressure increasing pump that once increases the pressure of the liquefied fluid supplied from the supercooling section to a supply pressure to the nozzle.
12. A liquefied fluid ejecting apparatus includes:
a nozzle that ejects the liquefied fluid vaporized after the ejection; and
the liquefied fluid supply system according to any one of claims 1 to 11, which supplies the liquefied fluid to the nozzle.
Technical Field
The present disclosure relates to a liquefied fluid supply system and a liquefied fluid injection device.
The present application claims priority based on japanese patent application No. 2018-015682, filed in japan on 31/1/2018, the contents of which are incorporated herein by reference.
Background
For example, patent document 1 discloses the following method: liquid nitrogen is injected instead of water, thereby processing or cleaning the object. In the water jet method using water, since cutting chips and the like or contaminants are mixed with water, it is necessary to consider the disposal of water itself, and a large amount of secondary waste may be generated. On the other hand, in the case of using liquid nitrogen vaporized after spraying, the liquid nitrogen is separated from the cutting blade or the contaminant and vaporized, and thus can be processed or cleaned without generating secondary waste.
Prior art documents
Patent document
Patent document 1: specification of us patent No. 7310955.
Disclosure of Invention
Problems to be solved by the invention
In patent document 1, however, liquid nitrogen supplied from a liquid nitrogen supply source is pressurized by a pre-pump (pre-pump) and an intensifier pump (intensifier pump), and the pressurized liquid nitrogen is injected from a nozzle. Since the liquid nitrogen is raised in temperature by the pressure rise by these pumps, in patent document 1, the liquid nitrogen is cooled by a heat exchanger during and after the pressure rise.
However, a part of the liquid nitrogen is vaporized at elevated temperature or in liquid transportation, and is discharged to the atmosphere as nitrogen gas. Therefore, in the method according to patent document 1, liquid nitrogen that is not ejected from the nozzle but discharged to the atmosphere to be consumed is generated in large quantities, and the consumption amount of liquid nitrogen increases uselessly.
The present disclosure has been made in view of the above-described problems, and an object thereof is to reduce the amount of liquefied fluid consumed without being injected from a nozzle in a liquefied fluid supply system and a liquefied fluid injection device using liquefied fluid vaporized after injection.
Means for solving the problems
As a means for solving the above problem, the present disclosure adopts the following configuration.
A liquefied fluid supply system according to a first aspect of the present disclosure is a liquefied fluid supply system that supplies a liquefied fluid vaporized after injection to a nozzle, and includes: an supercooling unit that cools the liquefied fluid to a temperature lower than a saturation temperature to obtain a supercooled liquid; and a pressure increasing unit that increases the pressure of the liquefied fluid that has been turned into the supercooled liquid by the supercooling unit and supplies the liquefied fluid to the nozzle.
A liquefied fluid supply system according to a second aspect of the present disclosure is the liquefied fluid supply system according to the first aspect, wherein the subcooling unit cools the liquefied fluid so that the liquefied fluid becomes a subcooling degree not exceeding a saturation temperature at the time of supply to the pressure-increasing unit and at the time of pressure increase in the pressure-increasing unit.
A liquefied fluid supply system according to a third aspect of the present disclosure is the first or second aspect, wherein the subcooling unit includes a subcooling unit heat exchanger that cools the liquefied fluid supplied to the pressure-increasing unit by heat exchange with a cooling liquefied fluid that is lower in temperature than the liquefied fluid.
A liquefied fluid supply system according to a fourth aspect of the present disclosure is the third aspect, wherein the subcooling unit includes a subcooling booster pump that pressure-feeds the liquefied fluid to the pressure-increasing unit.
In a liquefied fluid supply system according to a fifth aspect of the present disclosure, in the fourth aspect, the subcooling booster pump is housed in the subcooling portion heat exchanger.
A liquefied fluid supply system according to a sixth aspect of the present disclosure is the liquefied fluid supply system according to any one of the third to fifth aspects, wherein the subcooling unit includes: a discharge pipe connected to a storage tank for storing the liquefied fluid; a pressure increasing unit supply pipe that connects the subcooling unit heat exchanger and the discharge pipe and guides the liquefied fluid supplied to the pressure increasing unit to the subcooling unit heat exchanger; a cooling pipe that connects the subcooling part heat exchanger and the discharge pipe and guides the liquefied fluid to the subcooling part heat exchanger as the cooling liquefied fluid; and a cooling pipe resistance section provided at an intermediate portion of the cooling pipe and serving as resistance of the cooling liquefied fluid.
A liquefied fluid supply system according to a seventh aspect of the present disclosure includes, in the sixth aspect: a post-pressure-increasing cold heat exchanger for cooling the liquefied fluid whose pressure is increased by the pressure increasing unit; a post-cooling pipe that connects the post-pressure-increasing cooling heat exchanger and the discharge pipe and guides the liquefied fluid to the post-pressure-increasing cooling heat exchanger as a post-cooling liquefied fluid; and a post-cooling piping resistance part which is provided at an intermediate portion of the post-cooling piping and which serves as resistance of the post-cooling liquefied fluid.
A liquefied fluid supply system according to an eighth aspect of the present disclosure is the liquefied fluid supply system according to any one of the third to seventh aspects, wherein the pressure increasing unit includes: a booster pump that boosts the pressure of the liquefied fluid; a return pipe that returns a part of the liquefied fluid boosted in pressure by the booster pump to the supercooling unit as the liquefied fluid for cooling; and a return pipe resistance section provided at an intermediate portion of the return pipe and serving as resistance to the liquefied fluid that flows back as the liquefied fluid for cooling.
A liquefied fluid supply system according to a ninth aspect of the present disclosure is the eighth aspect, wherein the pressure-increasing unit includes a return flow amount limiting mechanism that is provided at an intermediate portion of the return pipe and that adjusts a flow rate of the liquefied fluid flowing through the return pipe.
A liquefied fluid supply system according to a tenth aspect of the present disclosure is the liquefied fluid supply system according to any one of the first to ninth aspects, wherein the pressure increasing unit includes: a primary pressure-increasing pump that increases the pressure of the liquefied fluid supplied from the subcooling unit; and a secondary booster pump for boosting the pressure of the liquefied fluid once boosted.
A liquefied fluid supply system according to an eleventh aspect of the present disclosure is the liquefied fluid supply system according to any one of the first to ninth aspects, wherein the pressure increasing unit includes a single-stage pressure increasing pump that increases the pressure of the liquefied fluid supplied from the supercooling unit to a supply pressure to the nozzle at a time.
A liquefied fluid injection device according to a twelfth aspect of the present disclosure includes: a nozzle that ejects the liquefied fluid vaporized after the ejection; and a liquefied fluid supply system according to any one of the first to eleventh aspects, configured to supply the liquefied fluid to the nozzle.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present disclosure, the liquefied fluid before being pressurized is cooled to a temperature lower than the saturation temperature by the subcooling portion, and becomes a subcooled liquid having a high degree of subcooling. Therefore, it is possible to prevent or suppress the liquefied fluid from reaching the saturation temperature or higher at the time of supply to the pressure increasing portion or during the pressure increasing process, and it is possible to prevent or suppress a part of the liquefied fluid from being vaporized and discharged to the atmosphere. Therefore, according to the present disclosure, in the liquefied fluid supply system and the liquefied fluid injection device using the liquefied fluid vaporized after injection, the amount of the liquefied fluid consumed without being injected from the nozzle can be reduced.
Drawings
Fig. 1 is a flowchart showing a schematic configuration of a liquefied fluid injection device according to a first embodiment of the present disclosure.
Fig. 2 is a flowchart showing a schematic configuration of a liquefied fluid injection device according to a second embodiment of the present disclosure.
Fig. 3 is a flowchart showing a schematic configuration of a liquefied fluid injection device according to a third embodiment of the present disclosure.
Detailed Description
Hereinafter, an embodiment of a liquefied fluid supply system and a liquefied fluid injection device according to the present disclosure will be described with reference to the drawings.
(first embodiment)
Fig. 1 is a flowchart showing a schematic configuration of a liquefied fluid injection device 1 according to a first embodiment. As shown in the drawing, the liquefied fluid injection device 1 of the present embodiment includes a storage tank 2, a liquefied fluid supply system 3, and a nozzle 4.
The storage tank 2 is a pressure tank for storing liquid nitrogen X (liquefied fluid), and is connected to a liquefied fluid supply system 3. The liquefied fluid injection device 1 according to the present embodiment may be configured not to include the storage tank 2 and to receive supply of the liquid nitrogen X from the outside. The liquefied fluid supply system 3 boosts the pressure of the liquid nitrogen X supplied from the storage tank 2 to a certain injection pressure. The liquefied fluid supply system 3 is connected to the nozzle 4. The nozzle 4 ejects liquid nitrogen X supplied from the liquefied fluid supply system 3 from the tip end portion.
The liquefied fluid injection device 1 of the present embodiment as described above boosts the pressure of the liquid nitrogen X vaporized by being injected into the atmosphere by the liquefied fluid supply system 3, and injects the liquid nitrogen X from the nozzle 4. That is, the liquefied fluid injection device 1 includes: a nozzle 4 that ejects liquid nitrogen X vaporized after the ejection; and a liquefied fluid supply system 3 that supplies liquid nitrogen X to the nozzle 4.
As shown in fig. 1, the liquefied fluid supply system 3 includes an
The
The subcooling
The
The cooling
The
Such a
The
The pre-pump 6a is a pump connected to the
The first booster pump 6c and the second booster pump 6d are pumps connected in parallel to the connection pipe 6b, and are supplied with liquid nitrogen X pressurized by the pre-pump 6a via the connection pipe 6 b. These first booster pump 6c and second booster pump 6d are, for example, piston pumps, and boost the pressure of the liquid nitrogen X once boosted by the pre-pump 6a for the second time. In this way, the
The delivery pipe 6e is a pipe connecting the first booster pump 6c and the second booster pump 6d to the after-cooling unit 7, and guides the liquid nitrogen X, which is secondarily pressurized by the first booster pump 6c or the second booster pump 6d, to the after-cooling unit 7. The end of the delivery pipe 6e on the side of the first booster pump 6c and the second booster pump 6d branches into two branches, one of which is connected to the first booster pump 6c and the other of which is connected to the second booster pump 6 d. In the delivery pipe 6e, the region of the non-branching intermediate portion passes through the pressure increasing unit heat exchanger 6 f.
The pressure increasing unit heat exchanger 6f is a heat exchanger through which the intermediate portion of the connecting pipe 6b and the intermediate portion of the delivery pipe 6e pass as described above, and exchanges heat between the liquid nitrogen X flowing through the connecting pipe 6b and the liquid nitrogen X flowing through the delivery pipe 6 e. The liquid nitrogen X flowing through the delivery pipe 6e is increased in pressure by the first booster pump 6c or the second booster pump 6d, and the temperature thereof is raised. Therefore, in the pressure increasing unit heat exchanger 6f, the temperature of the liquid nitrogen X flowing through the connection pipe 6b is increased by heat exchange, and the temperature of the liquid nitrogen X flowing through the delivery pipe 6e is decreased by heat exchange. For example, when the heat-resistant temperature on the low-temperature side of the first booster pump 6c and the second booster pump 6d is sufficiently low and the cooling performance of the after-cooling unit 7 of the subsequent stage is sufficiently high, the booster heat exchanger 6f can be omitted. That is, when the internal components of the first booster pump 6c and the second booster pump 6d can withstand the temperature of the liquid nitrogen X that is pressurized once by the front pump 6a and the liquid nitrogen X that is pressurized twice by the first booster pump 6c and the second booster pump 6d can be cooled to the injection temperature at the nozzle 4 only by the after-cooling section 7, the configuration may be such that the pressure-increasing section heat exchanger 6f is not provided.
The
The
The return flow
The after-cooling unit 7 includes a pressure-increasing after-
The after-cooling
The after-cooling piping orifice 7c is a resistance portion provided at an intermediate portion of the after-cooling
The flexible pipe 8 is a steel pipe connecting the aftercooling portion 7 and the nozzle 4, and the nozzle 4 is connected to the aftercooling portion 7 so that the posture of the operator can be easily changed. The aftercooling unit 7 is connected to the nozzle 4 via such a flexible tube 8, and cools the liquid nitrogen X after the pressure has been increased, and supplies the cooled liquid nitrogen X to the nozzle 4.
In the liquefied fluid injection device 1 of the present embodiment having such a configuration, the liquid nitrogen X stored in the storage tank 2 is supplied to the
The liquid nitrogen X supplied to the
The liquid nitrogen X flowing through the connection pipe 6b is heated by the pressure increasing unit heat exchanger 6f and then subjected to secondary pressure increase by the first intensifier pump 6c or the second intensifier pump 6 d. The liquid nitrogen X subjected to the secondary pressure increase is supplied to the aftercooling unit 7 via the delivery pipe 6 e. At this time, the liquid nitrogen X flowing through the delivery pipe 6e is cooled by the pressure increasing unit heat exchanger 6 f.
The liquid nitrogen X supplied to the after-cooling portion 7 is cooled to the injection temperature by heat exchange in the after-
According to the liquefied fluid injection device 1 and the liquefied fluid supply system 3 of the present embodiment as described above, the liquid nitrogen X before being pressurized is cooled to a temperature lower than the saturation temperature by the
In addition, in the liquefied fluid supply system 3, the
In the liquefied fluid supply system 3, the
In the liquefied fluid supply system 3, the
In addition, in the liquefied fluid supply system 3, the
Further, the liquefied fluid supply system 3 includes: a post-pressure-increase
In the liquefied fluid supply system 3, the pressure-increasing
The liquefied fluid supply system 3 includes a reflux
In the liquefied fluid supply system 3, the pressure-increasing
In the present embodiment, two booster pumps 6c and 6d are provided, but the present invention is not limited to this configuration, and one or three or more booster pumps may be provided. That is, the number of the secondary booster pumps of the present disclosure may be one or three or more.
(second embodiment)
Next, a second embodiment of the present disclosure will be described with reference to fig. 2. In the description of the second embodiment, the same portions as those of the first embodiment are omitted or simplified.
Fig. 2 is a flowchart showing a schematic configuration of a liquefied fluid injection device 1A according to a second embodiment. As shown in the drawing, in the liquefied fluid supply system 3 of the liquefied fluid injection device 1A according to the present embodiment, the
According to such a liquefied fluid supply system 3, the
Further, according to the liquefied fluid supply system 3, since the
(third embodiment)
Next, a third embodiment of the present disclosure will be described with reference to fig. 3. In the description of the third embodiment, the same portions as those of the first embodiment are omitted or simplified in description.
Fig. 3 is a flowchart showing a schematic configuration of a liquefied
The
In the liquefied fluid supply system 3, as in the second embodiment, the
Further, according to such a liquefied fluid supply system 3, the
While the preferred embodiments of the present disclosure have been described above with reference to the drawings, it is needless to say that the present disclosure is not limited to the above embodiments. The shapes, combinations, and the like of the respective constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the scope of the present disclosure.
For example, in the above-described embodiment, a configuration in which liquid nitrogen is used as the injected liquefied fluid has been described. However, the present disclosure is not limited thereto. For example, liquid carbon dioxide or liquid helium can also be used as the liquefied fluid.
In the above-described embodiment, the configuration in which the orifices are used as the cooling pipe resistance portion, the after-cooling pipe resistance portion, and the return pipe resistance portion has been described. However, the present disclosure is not limited to this, and a configuration may be adopted in which the throttle amount is variable by using a throttle valve or the like as the cooling pipe resistance portion, the after-cooling pipe resistance portion, and the return pipe resistance portion.
In the first and second embodiments, the configuration including the booster heat exchanger 6f is described. For example, in the present disclosure, the heater may be provided to the pressure increasing unit heat exchanger 6f or may be provided separately from the heater, and the liquid nitrogen X flowing through the connection pipe 6b may be heated to a higher temperature. In this case, the temperature of the liquid nitrogen X supplied to the first booster pump 6c and the second booster pump 6d becomes high, and therefore, the heat resistance requirement on the low temperature side of the seal and the like provided in the first booster pump 6c and the second booster pump 6d can be relaxed. However, it is needless to say that a configuration in which no heater is provided, and a configuration in which the booster heat exchanger 6f is not provided, may be adopted. This can maintain the temperature of the liquid nitrogen X flowing through the connection pipe 6b at a low temperature, and thus can reduce the consumption of the cooling liquid nitrogen X required in the post-pressure-rise
Industrial applicability
The present disclosure can be used in a liquefied fluid supply system and a liquefied fluid injection device that use a liquefied fluid that vaporizes after injection.
Description of the symbols
1 liquefied fluid injection device
1A liquefied fluid injection device
1B liquefied fluid injection device
2 storage tank
3 liquefied fluid supply system
4 nozzle
5 supercooling part
5a discharge piping
5b pipe for supplying pressure boosting part
5c supercooling part heat exchanger
5d connecting pipe
5e propulsion pump
5f delivery pipe
5g Cooling pipe
5h Cooling pipe orifice (Cooling pipe resistance part)
6 pressure boosting part
6a front pump (booster pump, primary booster pump)
6b connecting piping
6c first booster pump (Secondary booster pump)
6d second booster pump (secondary booster pump)
6e delivery pipe
6f pressure boosting part heat exchanger
6g return pipe
6h Return piping orifice (Return piping resistance part)
6i Single stage booster pump (Single stage booster pump)
7 after-cooling part
7a booster after-cooling heat exchanger
7b post-cooling pipe
7c rear cooling pipe orifice (rear cooling pipe resistance part)
8 Flexible pipe
X liquid nitrogen (liquefied fluid).
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