JP6603534B2 - Low temperature liquefied gas rectifier - Google Patents

Description

The present invention relates to a low-temperature liquefied gas rectifier that rectifies a low-temperature liquefied gas flowing in a bowl-shaped channel, and in particular, a low-temperature liquefied gas used in a freezing apparatus that freezes an object to be frozen in a liquid flow of the low-temperature liquefied gas. It relates to a rectifier.
In the present invention, flowing the fluid so as to be uniform in the channel width direction of the bowl-shaped channel is referred to as “rectification”.

  Conventionally, as a method of rapidly freezing food and liquid, a low-temperature liquefied gas in a liquid state is caused to flow through a bowl-shaped flow path, and an object to be frozen is introduced into the liquid flow of the low-temperature liquefied gas to flow down together. There is a method in which the frozen material and the low-temperature liquefied gas are separated and recovered on the downstream side of the channel.

  As an article freezing apparatus used in this method, there is a disclosure in Patent Document 1, and in the one disclosed in Patent Document 1, the low-temperature liquefied gas C stored in the low-temperature liquefied gas supply unit 1 is fixed by being tilted. Frozen material A is poured into the low temperature liquefied gas C, and the frozen material A is frozen along with the low temperature liquefied gas C by dropping the frozen material A into the low temperature liquefied gas C. And the frozen substance B and the low-temperature liquefied gas C are isolate | separated by the separation part 4 of the downstream (refer FIG. 1 of patent document 1). At this time, the low-temperature liquefied gas C separated by the separation unit 4 and collected by the liquid recovery container 5 is stored in the liquid reservoir 8 and then pumped up again by the air lift pump 7 to the upstream low-temperature liquefied gas supply unit 1. , Continuously supplied to the basket 2.

  In the freezing device disclosed in Patent Document 1, an air lift pump 7 is used for pumping the low temperature liquefied gas C. However, the air lift pump 7 is such that the low temperature liquefied gas C is easily ejected violently from the upper part of the pumping pipe. Thus, the loss of the low-temperature liquefied gas C and the problem of preventing the rectification of the low-temperature liquefied gas C flowing through the eaves 2 due to the waves generated in the low-temperature liquefied gas supply unit 1.

  Therefore, in the freezing apparatus disclosed in Patent Document 1, in order to stabilize the low-temperature liquefied gas C, the low-temperature liquefied gas C is temporarily stored in the low-temperature liquefied gas supply unit 1 to reduce the influence of the low-temperature liquefied gas C blowing out. I am letting.

Japanese Patent Laid-Open No. 7-23757

In the freezing device disclosed in Patent Document 1, in order to stabilize the low-temperature liquefied gas C, the low-temperature liquefied gas C is retained in the low-temperature liquefied gas supply unit 1 for a certain period of time. It was necessary. Furthermore, since the low temperature liquefied gas C is pumped up by the air lift pump 7, it is necessary to store the low temperature liquefied gas C in the liquid reservoir 8 to some extent.
Thus, the low temperature liquefied gas C reservoirs are provided in two locations, the upstream side low temperature liquefied gas supply unit 1 and the downstream side liquid reservoir 8, and a large amount of operation is required to operate the freezing apparatus. There was a problem that the low-temperature liquefied gas C was required.

  The present invention has been made in view of the above circumstances, and does not provide a reservoir for storing the low-temperature liquefied gas pumped upstream of the flow path, and does not require a large amount of low-temperature liquefied gas. It aims at providing the rectifier of the low temperature liquefied gas which can rectify the liquid flow of liquefied gas.

(1) The low-temperature liquefied gas rectifier according to the present invention is used in a freezing apparatus that freezes an object to be frozen into a low-temperature liquefied gas flowing in a bowl-shaped flow path, and stores the low-temperature liquefied gas. A liquid storage tank, a liquid pump that pumps up the low-temperature liquefied gas from the liquid storage tank via a pumping pipe, and a supply that supplies the low-temperature liquefied gas pumped up by the liquid pump to the upstream side of the bowl-shaped flow path The fan-shaped flow path includes a fan section having a flow path width extending from the upstream side toward the downstream side, and a constant width with a constant flow path width from the downstream end of the fan section. An upstream side wall that closes the upstream end, a lid that closes the upper part of the flow path, and a flow path width of the fan part that is continuously provided downward from the lid. A rectifying buffer plate is provided to block the upper part of the directional cross section.

(2) In the device according to (1), the supply pipe is provided with a supply port facing the bottom surface of the fan portion.

(3) In the above-described (1), the supply pipe has a supply port provided to face the upstream side wall surface of the fan portion.

(4) In the device according to any one of (1) to (3), a partition plate that divides the constant width portion in the flow channel width direction is provided, and for each divided flow channel divided by the partition plate The object to be frozen is charged.

(5) In the device according to any one of (1) to (4), a separation unit that is disposed at an end portion on the downstream side of the constant width unit and separates the low-temperature liquefied gas and the frozen material; A liquid recovery unit that recovers the low-temperature liquefied gas separated by the separation unit, the liquid recovery unit and the liquid storage tank are connected, and the low-temperature liquefied gas recovered by the liquid recovery unit is connected to the liquid storage tank The liquid return pipe | tube which returns to (1) is provided.

(6) In the device according to any one of (1) to (5), the liquid pump is a liquefied gas pump.

(7) In the device according to any one of (1) to (6), the object to be frozen put into the bowl-shaped channel is a droplet.

  The low-temperature liquefied gas rectifier according to the present invention is used in a freezing apparatus that freezes an object to be frozen in a low-temperature liquefied gas flowing in a bowl-shaped flow path, and stores the low-temperature liquefied gas. A tank, a liquid pump that pumps up the low-temperature liquefied gas from the liquid storage tank via a pumping pipe, and a supply pipe that supplies the low-temperature liquefied gas pumped up by the liquid pump to the upstream side of the bowl-shaped flow path. The fan-shaped flow path includes a fan section having a flow path width extending from the upstream side toward the downstream side, and a constant width section having a constant flow path width continuously from the downstream end portion of the fan section. An upstream side wall surface that closes the upstream end portion, a lid portion that closes the upper side of the flow path, and a downward section from the lid portion, the fan section having a cross section in the flow width direction. The low temperature pumped to the upstream side of the bowl-shaped channel by providing a rectifying buffer plate that closes the top of The low temperature liquefied gas supplied to the bowl-shaped flow path can be relaxed without storing the liquefied gas and without requiring a large amount of low temperature liquefied gas, and the liquid flow of the low temperature liquefied gas can be rectified. it can.

It is explanatory drawing explaining the rectifier of the low temperature liquefied gas which concerns on embodiment. It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 1). It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 2). It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 3). It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 4). It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 5). It is explanatory drawing explaining the direction of the supply port of low-temperature liquefied gas in this invention (the 6). It is explanatory drawing explaining the measurement result of the liquefied nitrogen flow rate in an Example.

  A low-temperature liquefied gas rectifier 100 (hereinafter simply referred to as “rectifier 100”) according to an embodiment of the present invention includes an object to be frozen in a low-temperature liquefied gas C flowing in a bowl-shaped channel 1 as shown in FIG. A is used for a freezing apparatus that inputs A and freezes to produce a frozen product B. The liquid storage tank 21 stores the low-temperature liquefied gas C and the low-temperature liquefaction from the liquid storage tank 21 through the pumping pipe 23. A liquid pump 25 that pumps up the gas C, a supply pipe 27 that supplies the low-temperature liquefied gas C to the upstream side of the bowl-shaped flow path 1, and a frozen material B and a low temperature provided at the downstream end of the bowl-shaped flow path 1 The separation unit 41 that separates the liquefied gas C, the liquid recovery unit 43 that recovers the low-temperature liquefied gas C separated by the separation unit 41, the liquid recovery unit 43, and the liquid storage tank 21 are connected, and the liquid recovery unit 43 Provided with a liquid return pipe 45 for returning the low-temperature liquefied gas C recovered to the liquid storage tank 21 A.

  Hereinafter, with reference to FIGS. 1-7, each component of the rectifier 100 is demonstrated in detail. Note that, in the drawings used in the following description, in order to make the characteristics of each component easy to understand, there are cases where the characteristic portions are enlarged for the sake of convenience, and the dimensional ratios and the like of each component are actual. It is not necessarily the same as the device.

<Liquid storage tank>
The liquid storage tank 21 stores the low-temperature liquefied gas C supplied to the bowl-shaped flow path 1.
SUS304 can be used as the material of the liquid storage tank 21, but the material is not limited to this, and any material may be used as long as it does not react with the low temperature liquefied gas C.

<Liquid pump and pump>
The liquid pump 25 continuously pumps the low-temperature liquefied gas C stored in the liquid storage tank 21 through the pumping pipe 23, and a liquefied gas pump, air lift pump, vertical pump, or the like may be used. it can.

<Supply pipe>
The supply pipe 27 supplies the low-temperature liquefied gas C pumped up by the liquid pump 25 to the upstream side of the bowl-shaped flow path 1, and includes a supply port 27a for ejecting the pumped low-temperature liquefied gas C.

<Saddle-shaped channel>
The bowl-shaped flow path 1 is a bowl-shaped flow path that forms a liquid flow of the supplied low-temperature liquefied gas C, and is a flow path in a direction orthogonal to the liquid flow of the low-temperature liquefied gas C as shown in FIG. A fan section 3 having a fan-like width and a constant width section 5 having a constant flow path width are provided continuously from the downstream end portion 3a of the fan section 3.

<< Fan section >>
The fan part 3 is a part where the flow path width extends in a fan shape from the upstream side to the downstream side, and a supply pipe 27 for supplying the low-temperature liquefied gas C is connected to the upstream side of the fan part 3.
Then, the fan part 3 is continuous downward from the upstream side wall surface 7 that closes the upstream end, the lid part 9 that closes the upper part of the flow path, and the downstream end part of the cover part 9. A rectifying buffer plate 11 is provided to close the upper part of the cross section in the flow path width direction at the downstream end 3a.

  The lid portion 9 is provided on the upper surface of the fan portion 3 in order to close the upper portion of the bowl-shaped flow passage 1, and the loss due to scattering of the low-temperature liquefied gas C spouted to the fan portion 3 and further vaporization is caused. To prevent.

  The rectifying buffer plate 11 is disposed on the downstream end portion 3a of the fan portion 3 continuously from the downstream end portion of the lid portion 9, and is rectified with the bottom surface 3b of the fan portion 3 (see FIG. 2). The upper end of the cross section in the flow path width direction at the end portion 3a is closed so that a gap is formed between the lower end 11a of the buffer plate 11 and the wave preventing plate is protected against excessive undulation of the low-temperature liquefied gas C. It plays a role and rectifies the uneven drift in the channel width direction.

  The predetermined height of the gap formed between the bottom surface 3b of the fan section 3 and the lower end 11a of the rectifying buffer plate 11 is 20 mm in the embodiment described later, but the predetermined height is limited to this value. However, it can be appropriately changed according to the depth of the liquid flow of the low-temperature liquefied gas C.

  As described above, the fan part 3 has a shape in which the flow path width is widened from the upstream side toward the downstream side, and thus has an effect of rectifying the liquid flow of the low-temperature liquefied gas C supplied to the upstream side of the fan part 3. Therefore, the spread of the fan part 3 can be defined by the essential angle of the fan (the central angle of the fan shape).

When the central angle of the sector is reduced without changing the flow path width at the downstream end portion 3a of the fan unit 3, the fan unit 3 becomes longer in the direction of the liquid flow. The rectifying effect is increased. However, in this case, loss due to vaporization of the low-temperature liquefied gas C supplied to the fan unit 3 also increases. Therefore, from experience, it is desirable that the central angle of the sector is in the range of 20 to 40 degrees.
In the present embodiment, the central angle of the fan shape in the fan portion 3 is set to 30 degrees with reference to the case where the supply amount of the low-temperature liquefied gas C is 15 L / min.

Furthermore, the detailed shape of the fan part 3 can be appropriately changed according to the supply amount of the low-temperature liquefied gas C and the state of the low-temperature liquefied gas C to be pumped.
When the supply amount of the low-temperature liquefied gas C supplied to the fan unit 3 is large, or when the low-temperature liquefied gas C in a liquid state is blown violently from the supply pipe 27, the fan unit 3 is desirably relatively large. .

≪Constant width part≫

  The constant width portion 5 is provided so as to be connected to the downstream end portion 3a of the fan portion 3, and the upper portion is opened from the upstream side to the downstream side so that the flow path width is constant. The channel width in the constant width portion 5 is equal to the maximum channel width in the fan portion 3, that is, the channel width in the end portion 3 a on the downstream side of the fan portion 3.

  In the rectifying device 100 according to the present embodiment, the low-temperature liquefied gas C that has flowed down the fan unit 3 flows into the constant-width unit 5, and a liquid flow rectified in the flow path width direction is formed. And the to-be-frozen object A thrown in in the upstream of the constant width part 5 is frozen in the liquid flow of the low temperature liquefied gas C, and the low temperature liquefied gas C and the frozen material B flow down.

Further, as shown in FIG. 1, the rectifier 100 is provided with a partition plate 13 that is arranged in parallel with the liquid flow of the low-temperature liquefied gas C and that equally divides the constant width portion 5 in the flow path width direction.
Here, the partition plate 13 is provided in accordance with the number of the objects to be frozen A that are simultaneously introduced into the constant width portion 5, and the object to be frozen A is introduced into each divided flow path (lane) divided by the partition plate 13. Thus, it is possible to prevent the objects to be frozen A from coming into contact with each other in the liquid flow of the low temperature liquefied gas C.

  Further, the partition plate 13 disposed in the constant width portion 5 has a height upstream of the dropping position of the article A to be frozen than the liquid level height of the liquid flow of the low-temperature liquefied gas C in the constant width portion 5. However, it is desirable that at the downstream side of the dripping position of the object A to be frozen, it is equal to or slightly higher than the liquid level of the liquid flow of the low temperature liquefied gas C in the constant width portion 5.

Thereby, on the upstream side of the dripping position of the object A to be frozen, even if the amount of the low-temperature liquefied gas C flowing into the upstream end portion of the constant width portion 5 is different in the channel width direction, the liquid An effect of leveling the surface height can be expected, and an effect of preventing the objects to be frozen A flowing down the constant width portion 5 from contacting each other can be expected downstream of the dropping position.
And as a shape of the partition plate 13, what is necessary is just to make it the thing which provided the level | step difference in the height direction in the dripping position of the to-be-frozen thing A, and the thing inclined so that it might become high toward the downstream from the upstream. .

  In addition, in FIG. 1, although the example which divided the constant width part 5 into the flow path width direction by the partition plate 13 is shown, the division | segmentation number in the flow path width direction of the constant width part 5 is limited to this. Instead, the number of divisions can be arbitrarily set according to the number of objects A to be frozen simultaneously fed into the constant width portion 5.

In the rectifier 100 according to the present embodiment, the bowl-shaped channel 1 is provided with an inclination of 0.05 to 1.00 degrees so that the low-temperature liquefied gas C and the frozen material B flow smoothly.
Moreover, although SUS304 was used for the material of the bowl-shaped flow path 1, ie, the fan part 3 and the constant width part 5, it is not limited to this, It does not react with the low temperature liquefied gas C and the to-be-frozen object A, Any material can be used as long as it is suitable for the surrounding environment.

<Separation part>
The separation part 41 is provided at the downstream end of the constant width part 5 in the bowl-shaped channel 1 and separates the low temperature liquefied gas C and the frozen substance B flowing down the constant width part 5.
In the present embodiment, SUS304 can be used as the material of the separation part 41, but the material is not limited to this, and any material can be used as long as it does not react with the low temperature liquefied gas C.

<Liquid recovery part and liquid return pipe>
The liquid recovery unit 43 is disposed directly below the separation unit 41 and recovers the low-temperature liquefied gas C separated by the separation unit 41. The frozen substance B separated by the separation unit 41 is collected in another container (not shown).
The liquid return pipe 45 is connected to the liquid recovery part 43 and the liquid storage tank 21, and the low-temperature liquefied gas C recovered in the liquid recovery part 43 flows through the liquid return pipe 45 and is returned to the liquid storage tank 21. .

  In the present embodiment, SUS304 can be used as the material for the liquid recovery unit 43 and the liquid return pipe 45, but the material is not limited to this, and the material may be any material that does not react with the low-temperature liquefied gas C. It doesn't matter.

<Method of rectifying low-temperature liquefied gas>
Next, a method for rectifying the low-temperature liquefied gas C by the rectifier 100 will be described below.
First, a predetermined amount of low-temperature liquefied gas C is stored in the liquid storage tank 21.
Thereafter, the low-temperature liquefied gas C is pumped up by the liquid pump 25 and supplied from the supply pipe 27 to the upstream side of the fan section 3 of the bowl-shaped flow path 1.

The low-temperature liquefied gas C pumped up by the liquid pump 25 includes a gas state vaporized by the ambient temperature, and may blow out violently from the supply port 27a of the supply pipe 27.
However, the lid portion 9 provided so as to close the upper side of the flow path in the fan portion 3 can prevent loss due to scattering or further vaporization of the low-temperature liquefied gas C blown out from the supply port 27a.
Furthermore, the direction of the supply port 27a is devised (see FIGS. 4 to 7), and the flow of the low-temperature liquefied gas C is greatly increased by the rectifying buffer plate 11 provided at the end 3a on the downstream side of the fan unit 3. Can be relaxed.

The low-temperature liquefied gas C ejected from the supply port 27 a is rectified in the fan part 3 and flows into the constant width part 5.
Here, since the divided flow path (lane) in which the constant width portion 5 is equally divided is formed by providing the partition plate 13 in the constant width portion 5, the object A to be frozen is simultaneously introduced into each divided flow path In this case, the charged objects A can be prevented from contacting each other in the liquid flow of the low-temperature liquefied gas C.

  The low-temperature liquefied gas C flowing down the constant width portion 5 is recovered in the liquid recovery portion 43 provided at the downstream end of the constant width portion 5 and returned to the liquid storage tank 21 via the liquid return pipe 45. Then, the low-temperature liquefied gas C is circulated by pumping up again with the liquid pump 25.

  As described above, a large flow rectification effect is obtained with respect to the liquid flow of the low-temperature liquefied gas C by greatly widening the flow path width in the fan unit 3. The drift can be suppressed.

  Further, by providing the lid 9 and the rectifying buffer plate 11 in the fan 3, loss due to vaporization and scattering is prevented when the low-temperature liquefied gas C pumped up by the liquid pump 25 is supplied to the upstream side of the fan 3. In addition, the rectifying buffer plate 11 can uniformly rectify excessive drift in the flow width direction of the liquid flow of the low temperature liquefied gas C by preventing excessive undulation in the liquid flow of the low temperature liquefied gas C. it can.

  The low temperature liquefied gas C is recovered by a liquid recovery part 43 disposed below the separation part 41 provided at the downstream end of the constant width part 5 of the bowl-shaped channel 1, and the liquid is passed through a liquid return pipe 45. By returning to the storage tank 21, the low-temperature liquefied gas C flowing down the bowl-shaped channel 1 can be circulated, and the low-temperature liquefied gas C can be effectively used when the object A to be frozen is frozen.

  The rectifying device 100 according to the present embodiment collects the low-temperature liquefied gas C flowing down the bowl-shaped flow path 1 and returns it to the liquid storage tank 21 to circulate the low-temperature liquefied gas C. Even if the low-temperature liquefied gas C is not recovered and only the low-temperature liquefied gas C supplied to the liquid storage tank 21 is caused to flow down into the bowl-shaped flow path 1, the low-temperature liquefied gas C can be rectified.

  The supply pipe 27 that supplies the low-temperature liquefied gas C to the bowl-shaped channel 1 changes the direction of the supply port 27a as shown in FIGS. 2 to 7 in accordance with the momentum of the low-temperature liquefied gas C ejected to the fan section 3. It can be changed and provided as appropriate.

  When the supply amount of the low-temperature liquefied gas C is small, as shown in FIGS. 2 and 3, the supply port 27 a is provided in the upstream side wall surface 7 of the fan portion 3, so that the low-temperature liquefied gas C can be supplied in the liquid flow direction. .

When the supply amount of the low-temperature liquefied gas C is slightly large and the blowout is slightly intense, as shown in FIGS. 4 and 5, the supply port 27 is provided with the supply port 27a facing the bottom surface 3b of the fan unit 3, and the supply port 27a It is desirable to supply the low-temperature liquefied gas C blown out from the fan 3 so as to collide with the bottom surface 3b of the fan part 3.
In this case, the low-temperature liquefied gas C blown out toward the bottom surface 3b changes by 90 degrees in a direction parallel to the liquid flow of the low-temperature liquefied gas C after colliding with the bottom surface 3b, so Is buffered.

  When the supply amount of the low-temperature liquefied gas C is larger and the low-temperature liquefied gas C is ejected from the supply port 27a, the supply port 27a is located upstream of the fan unit 3 as shown in FIGS. It is desirable to be provided to face the upstream side wall surface 7 provided at the end portion on the side.

  In this case, the low-temperature liquefied gas C ejected violently from the supply port 27 a first flows downward after colliding with the upstream side wall surface 7. Next, the low-temperature liquefied gas C flowing downward collides with the bottom surface 3b and flows down to the downstream side of the fan part 3 (see FIGS. 6 and 7). Thereby, the momentum of the low temperature liquefied gas C can be buffered.

  As described above, by appropriately changing the direction of the supply port 27a for supplying the low-temperature liquefied gas C, it is possible to buffer the momentum of the low-temperature liquefied gas C that has been ejected and to further enhance the rectifying effect in the fan section 3.

  Further, in the above description, the low-temperature liquefied gas C is supplied from one liquid pump 25 to one saddle-shaped flow path 1, but the supply pipe 27 is branched into a plurality of pipe-shaped flows. The low-temperature liquefied gas C may be supplied to the path 1.

In the rectifier 100, liquefied nitrogen can be used as the low-temperature liquefied gas C.
As the liquid pump 25, a liquefied gas pumping pump can be used.
However, liquefied nitrogen may be pumped using an air lift pump, a vertical pump, or the like.

  Examples of the object to be frozen A that is put into the liquid flow of the low-temperature liquefied gas C in the bowl-shaped channel 1 include foods and chemicals, and can be frozen by dropping droplets or by putting solid substances.

Further, in the present embodiment, as illustrated in FIG. 1, the partition plate 13 that is arranged in parallel with the liquid flow of the low-temperature liquefied gas C and divides the constant width portion 5 in the flow path width direction is formed as the constant width portion 5. Providing the object to be frozen A for each divided flow path provided by the partition plate 13 prevents the objects to be frozen A from contacting each other even when a plurality of objects to be frozen A are simultaneously charged. To do.
However, when the liquid flow of the low-temperature liquefied gas C is sufficiently rectified in the bowl-shaped flow path 1, even if the article to be frozen A is introduced without providing the partition plate 13 in the bowl-shaped flow path 1, A can be frozen without contacting them.

  Using the rectifier 100 according to the present embodiment (see FIG. 1), an experiment was conducted to demonstrate the rectification effect of the liquid flow of the low-temperature liquefied gas C.

In the present embodiment, liquefied nitrogen was used as the low-temperature liquefied gas C, and a liquefied gas lift pump was used as the liquid pump 25.
First, liquefied nitrogen stored in the liquid storage tank 21 is pumped up by the liquefied gas pump, and liquefied nitrogen is supplied to the upstream side of the bowl-shaped channel 1 to form a liquid flow of liquefied nitrogen in the bowl-shaped channel 1. did.

The bowl-shaped channel 1 has a fan part 3 and a constant width part 5 continuous from the downstream end part 3a of the fan part 3, and the inclination angle of the bowl-shaped channel 1 is set to 1.00 degrees.
The fan section 3 has an overall length of 100 mm and a fan-shaped central angle of 30 degrees. In addition, the upstream side wall surface 7 that closes the upstream end portion, the lid portion 9 that closes the upper portion, and the flow passage width direction at the downstream end portion 3 a of the fan portion 3 continuously from the lid portion 9. A rectifying buffer plate 11 is provided to close the upper portion of the cross section, and the height between the bottom surface 3b of the fan portion 3 and the lower end 11a of the rectifying buffer plate 11 is set to 20 mm.

  The constant width portion 5 had a total length of 1,500 mm and a channel width of 120 mm. The constant width portion 5 was provided with six divided flow paths (lanes) equally divided in the flow path width direction by the partition plate 13.

  In this example, the liquefied nitrogen flow rate flowing down the constant width portion 5 was measured for each lane. FIG. 8 and Table 1 show the measurement results of the liquefied nitrogen flow rate in each lane provided in the constant width portion 5.

In the measurement result, the standard deviation representing the variation in the liquefied nitrogen flow rate in each lane of the constant width portion 5 was 0.125.
Therefore, according to the low-temperature liquefied gas rectifier according to the present invention, it was proved that the liquid flow of liquefied nitrogen can be efficiently rectified without loss even when liquefied nitrogen is blown violently.

DESCRIPTION OF SYMBOLS 1 Corrugated flow path 3 Fan part 3a End part 3b Bottom face 5 Constant width part 7 Upstream side wall surface 9 Lid part 11 Rectification buffer plate 11a Lower end 13 Partition plate 21 Liquid storage tank 23 Lifting pipe 25 Liquid pump 27 Supply pipe 27a Supply Mouth 41 Separator 43 Liquid recovery unit 45 Liquid return pipe 100 Rectifier

Claims (6)

A rectifying device for low-temperature liquefied gas used in a freezing apparatus that freezes an object to be frozen in low-temperature liquefied gas flowing through a bowl-shaped flow path,
A liquid storage tank for storing the low-temperature liquefied gas;
A liquid pump for pumping the low-temperature liquefied gas from the liquid storage tank via a pumping pipe;
A supply pipe for supplying the low-temperature liquefied gas pumped up by the liquid pump to the upstream side of the bowl-shaped flow path,
The bowl-shaped flow path has a fan part whose flow width is widened from the upstream side toward the downstream side, and a constant width part having a constant flow path width continuously from the downstream end part of the fan part,
An upstream side wall surface that closes the upstream end portion, a lid portion that closes the upper portion of the flow path, and a lower portion from the lid portion are continuously provided on the fan portion, and an upper portion of the cross section in the flow passage width direction of the fan portion is provided. A rectifying shock-absorbing plate is provided ,
The supply pipe has a supply port facing the upstream side wall surface of the fan portion, and a rectifier for low-temperature liquefied gas, wherein A rectifying device for low-temperature liquefied gas used in a freezing apparatus that freezes an object to be frozen in low-temperature liquefied gas flowing through a bowl-shaped flow path,
A liquid storage tank for storing the low-temperature liquefied gas;
A liquid pump for pumping the low-temperature liquefied gas from the liquid storage tank via a pumping pipe;
A supply pipe for supplying the low-temperature liquefied gas pumped up by the liquid pump to the upstream side of the bowl-shaped flow path,
The bowl-shaped flow path has a fan part whose flow width is widened from the upstream side toward the downstream side, and a constant width part having a constant flow path width continuously from the downstream end part of the fan part,
An upstream side wall surface that closes the upstream end portion, a lid portion that closes the upper portion of the flow path, and a lower portion from the lid portion are continuously provided on the fan portion, and an upper portion of the cross section in the flow passage width direction of the fan portion is provided. A rectifying shock-absorbing plate is provided ,
A rectifier for low-temperature liquefied gas, characterized in that a partition plate that divides the constant width portion in the flow channel width direction is provided, and the material to be frozen is introduced into each divided flow channel divided by the partition plate . The low-temperature liquefied gas rectifier according to claim 2 , wherein the supply pipe has a supply port facing the bottom surface of the fan portion. A separation unit that is disposed at an end portion on the downstream side of the constant width unit and separates the low-temperature liquefied gas and the frozen material;
A liquid recovery unit for recovering the low-temperature liquefied gas separated by the separation unit;
The liquid recovery pipe and the liquid storage tank are connected, and a liquid return pipe for returning the low-temperature liquefied gas recovered by the liquid recovery section to the liquid storage tank is provided. The low-temperature liquefied gas rectifier according to any one of the above.   The low-temperature liquefied gas rectifier according to any one of claims 1 to 4, wherein the liquid pump is a liquefied gas pump.   The low-temperature liquefied gas rectifier according to any one of claims 1 to 5, wherein the object to be frozen put into the bowl-shaped channel is a droplet.