JP4766623B2 - Gas-liquid mixed flow injection device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gas-liquid mixed flow spraying apparatus that can be widely applied as various spraying nozzles such as a cleaning nozzle for a vehicle, a wall of a building, a wall, a tableware, and the like.
[0002]
[Prior art]
In this type of conventional injection device, one that injects a gas-liquid mixed flow from a single injection port having a circular shape or a flat shape is widely known. However, when the injection port is circular, the strength of the spraying action is different between the central part and the peripheral part of the injected gas-liquid mixed flow. Had a technical problem of uneven spraying. On the other hand, in the case of a flat injection port, wide and efficient spraying is possible, but in this case as well, the spray flow is made uniform so that the spraying action at the center and the periphery is uniform. It was not easy to form. In particular, when the injection state can be changed, it is technically difficult to always set the spraying action at the central portion and the peripheral portion to be uniform under any injection condition.
[0003]
[Problems to be solved by the invention]
The present invention has been invented in view of the above-described conventional technical situation, and achieves the uniformity of the spraying action by the gas-liquid mixed flow, and is easy to use with less spraying unevenness and efficient spraying. It is an object of the present invention to provide an injection device having a good gas-liquid mixed flow.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1, in the injection device configured to inject from the injection port while mixing at least liquid and gas to form a gas-liquid mixed flow, the flow path of the gas-liquid mixed flow The flow passage is divided into a plurality of flow passages along the flow by a partition, and a liquid injection port is provided so as to correspond to each of the divided flow passages. The gas-liquid mixture injected from each flow passage is configured such that the mass flow rate per cross-sectional area of the flowing gas-liquid mixture flow is substantially equal , and the end portion of the partition is an intermediate position of the flow passage of the gas-liquid mixed flow Adopted the technical means to join the flow and inject . In the present invention, the flow passage of the gas-liquid mixed flow is formed in a flat shape, the inside of the flow passage is divided into a plurality of flows by a partition, and the liquid is supplied from the liquid injection ports corresponding to the respective flow passages. Since it comprised, the gas-liquid mixed flow of each flow path can be formed more exactly as set. That is, the mass flow rate per cross-sectional area of the gas-liquid mixed flow in each flow path is made substantially equal by taking into account the number of installed liquid injection ports, the injection state, the positional relationship between the installation position and each partition, etc. Since it can be set easily, it is possible to easily obtain a flat gas-liquid mixed flow having a uniform spraying range with a good uniformity with little spraying unevenness. In addition, since the end portion of the partition is the intermediate position of the flow path of the gas-liquid mixed flow, the gas-liquid mixed flow injected from each flow passage is merged and injected, so the boundary between the gas-liquid mixed flows And can be ejected from one ejection port as a borderless jet stream.
[0005]
In addition, it forms so that the width | variety of each flow path may be gradually expanded toward the downstream in the direction where the said each divided flow path is located in a line (Claim 2), or in the direction orthogonal to the direction where these each flow path is located. You may form so that the width | variety of each flow path may be gradually expanded toward a downstream (Claim 3) . Also, the upstream end of the partition can be arranged at an appropriate distance away from the liquid ejection nozzle (Claim 4). Further, the liquid injection port is formed by increasing the gas injection speed by forming the gas flow passage for supplying gas to the flow passage of the gas-liquid mixed flow so as to gradually reduce the cross-sectional area toward the supply port. The deceleration of the liquid ejected from the liquid can be suppressed (claim 5 ). In addition, by providing a minimum throttle portion with a reduced cross-sectional area in the flow path of the gas-liquid mixed flow, and forming the downstream cross-sectional area to be the same as or gradually enlarged from the minimum throttle portion, It is also possible to suppress or accelerate the deceleration in each flow passage (Claim 6 ).
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The injection device according to the present invention can be widely applied as various injection nozzles such as washing nozzles and paint nozzles for vehicles, wall surfaces of buildings, walls, tableware and the like. As the liquid to be injected into the flow passage, an appropriate liquid such as normal water such as tap water or a cleaning liquid in which an additive such as a surfactant is added as necessary to improve the detergency and sterilization power is used. Can be used. Further, the supply pressure of the liquid may be about the same as tap water, but a high discharge pressure from a high pressure pump or the like may be used. Regarding the gas, it may be configured to suck the atmosphere by the ejector action of the liquid jet flow injected into the mixed flow passage, or it may be a pressurized gas such as compressed air, or a high temperature and high pressure such as high temperature gas or steam. It is also possible to use gas. Furthermore, in addition to the liquid and gas, appropriate powders such as sodium hydrogen carbonate and abrasives are mixed and supplied to the liquid and gas, or supplied to the flow path from a separate inlet. It is also possible to configure.
[0007]
One or more partitions may be installed to partition the gas-liquid mixed flow. In other words, the flow space of the gas-liquid mixed flow may be divided into two or more by a partition to form a plurality of flow passages. As for the installation position of the upstream end of the partition, any partition may be used as long as it partitions the flow path of the gas-liquid mixed flow. For example, the upstream end of the partition is provided at a position away from the liquid ejection port by an appropriate distance, or the upstream end of the partition is disposed at the same position as the liquid ejection port so as to contact the liquid ejection port, It is also possible to arrange it so that the liquid injection port opens rearward from the upstream end of the partition. Note that the cross-sectional areas of the respective flow passages partitioned by the partitions do not necessarily have to be the same, and the cross-sectional areas are different depending on the flow passages, and the number of the corresponding gas-liquid mixed flow injection ports installed is set. It is also possible to configure by changing or changing the aperture. In short, the mass flow rate per cross-sectional area of the gas-liquid mixed flow that flows through each flow passage should be almost equal, and any setting can be made regarding the way of installing the partition, the specific shape and the number of the injection ports. . When the injection range is widened, the number of partitions can be increased by making the flow path of the gas-liquid mixed flow wider or widening at the end.
[0008]
Furthermore, the partition has its end portion set at an intermediate position of the gas-liquid mixed flow passage. Since it comprised in this way, each gas-liquid mixed flow divided | segmented by the said partition merges in the intermediate | middle with the injection port downstream from the terminal part of a partition, and the boundary which exists among those each gas-liquid mixed flows Therefore, a better jet flow without a boundary can be obtained, and a streak-like sprayed state due to the boundary between the gas-liquid mixed flows can be accurately avoided. Incidentally, as shown in the following examples, the shape of the end portion of the partition may be formed in a stepped shape, an inclined shape, a bifurcated shape, or the like. Since the rapid merging of the gas-liquid mixed flow between the flow passages is alleviated, a smoother merging of the gas-liquid mixed flow can be achieved.
[0009]
With respect to the liquid ejection ports for ejecting liquid into the flow passages, one or a plurality of liquid ejection ports are installed corresponding to the respective flow passages. In that case, it is also possible to arrange the liquid ejection ports in a plurality of stages in parallel in the vertical direction. For example, two liquid ejection ports arranged in a vertical direction may correspond to each flow passage. In addition, it is possible to change the number of installed liquid ejection ports corresponding to each flow passage, or to vary the ejection amount from each liquid ejection port. In short, the mass flow rate per cross-sectional area of the gas-liquid mixed flow that flows through each flow passage may be substantially equal. For example, it is possible to associate two liquid ejection ports with the central flow passage and associate three liquid ejection ports with the flow passages on both sides thereof. In addition, the shape of the liquid ejection port may be an appropriate shape such as a circle, a rectangle, or a slit. It is desirable that the direction of the liquid injection ports is provided so that the injection flow does not contact the wall surface in the vicinity of the inlet of the flow passage. In addition, when a plurality of liquid ejection ports are arranged side by side in the vertical direction as described above, a horizontal partition is added to the vertical partition corresponding to the arrangement of the liquid ejection ports, and the flow passage is vertically and horizontally arranged. You may make it divide | segment into. In this way, when the flow passage is divided vertically and horizontally using the vertical partition and the horizontal partition, the end portion of one or both of the vertical and horizontal partitions is set at the intermediate position of the flow passage. Alternatively, the stepped shape or the inclined shape may be employed as the shape of the terminal portion.
[0010]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings. Figure 1 is an exploded view showing an outline of engagement Ru real施例the present invention. 2 is a longitudinal sectional view of the embodiment, and FIG. 3 is a partially enlarged view thereof. FIG. 4 is a partially enlarged cross-sectional view of the embodiment in the horizontal direction . As shown in the figure, the ejection device 1 of the present embodiment has a long nozzle portion 2, and supplies the lower body 3 and the upper body 4 to a space formed on the upstream side between them. It is formed by assembling while installing the part 5. The liquid supply part 5 is configured to be assembled from a plurality of members, and a flat storage part 6 is formed in the center part. In the present embodiment, as shown in FIG. 4 , three liquid ejection ports 10 to 12 are formed at the distal end portion from the flat storage portion 6 through the three flow paths 7 to 9. In addition, a liquid supply path 13 is connected to the upper part of the flat storage part 6 so that pressurized liquid is supplied from a pressurized liquid supply source (not shown) via the connection part 14. A tapered portion 15 is formed on the upstream side of the liquid supply portion 5 so as not to obstruct the gas flow. Further, engagement convex portions 16 and 17 are formed on the side of the liquid supply unit 5, and depending on the case, engagement convex portions 18 and 19 formed on both or one of the lower main body 3 and the upper main body 4. By combining them, both are positioned.
[0011]
As shown in FIG. 3, the lower main body 3 and the upper main body 4 of the present embodiment are formed substantially symmetrically except for the insertion portion of the liquid supply path 13 to form an installation space for the liquid supply portion 5. The slopes 22 and 23 and the slopes 24 and 25 are formed before and after the recesses 20 and 21 to be formed, and a connection portion 26 for pressurized gas is formed so as to be connected to the slopes 22 and 23 on the upstream side thereof. The pressurized gas is supplied from the gas supply source. Further, a tapered portion 27 formed on the downstream side of the liquid supply unit 5 is disposed inside the inclined surfaces 24 and 25 on the downstream side, and a cross-sectional area is supplied between the inclined surfaces 24 and 25 and the tapered portion 27. Gas flow passages 28 and 29 that gradually reduce toward the mouth are formed. Therefore, in the case of the present embodiment, the pressurized gas from the gas flow passages 28 and 29 is jetted above and below the liquid jet flow ejected from the liquid jet ports 10 to 12, and around each liquid jet flow. Liquid and gas will be injected toward each flow path so that it may be surrounded by a gas injection flow.
[0012]
Further, as shown in the figure, a downstream side of the liquid injection ports 10 to 12 and the gas flow passages 28 and 29 is provided with a minimum throttle portion 30 having a cross-sectional area reduced to the minimum, upstream of the minimum throttle portion 30. In the space on the side, the mixture of the liquid ejected from the liquid ejection ports 10 to 12 and the gas ejected from the gas flow passages 28 and 29 is promoted to form a gas-liquid mixed flow. . The space on the upstream side of the minimum throttling portion 30 is intended to gradually reduce the cross-sectional area toward the downstream side so as to promote the mixing action of the gas and the liquid and suppress the deceleration of the liquid droplet. The upper and lower surfaces are formed as tapered inclined surfaces. Further, as shown in FIG. 4 , the space is formed in a wide flat shape along the arrangement direction of the liquid ejection ports 10 to 12, and in this embodiment, the partitions 31, 32 is provided to divide the gas-liquid mixed flow into a plurality of flow passages 33 to 35. That is, a flat gas-liquid mixed flow is formed in the wide flat space, the flat gas-liquid mixed flow is divided by the partitions 31 and 32, and the injection ports are formed via the flow passages 33 to 35. 36 to lead to 36 . Thus, it is possible to accurately and stably distributed set as a gas-liquid mixing flow on the flow path 33 to 35, injection port 3 six et gas-liquid mixed flow of polarized Tairajo that will be formed by a jet of Is characterized in that the unevenness of the spraying action between the central part and the peripheral part can be solved accurately.
[0013]
When positioning the partitions 31 and 32, while considering the liquid injection state from the liquid injection ports 10 to 12, the gas injection state from the gas flow passages 28 and 29, the mixed state of the gas-liquid mixed flow, etc. The positions of the upstream end portions of the partitions 31 and 32, that is, the liquid injection ports 10 to 12 and the partitions 31 and 32, so that the mass flow rate per cross-sectional area of the gas-liquid mixed flow flowing through the flow passages 33 to 35 are substantially equal. The positional relationship with the front end, the interval between the partitions 31 and 32, and the like are set. As a result, the mass flow rate per cross-sectional area of each part of the gas-liquid mixed flow to be injection port 3 six et injection becomes substantially equal, excellent ejection state of homogeneity is obtained. Incidentally, the gas-liquid mixed flow flowing down the flow paths 33 to 35 divided by the partition 31 and 32, is promoted even further mixing in the meantime, the injection port 3 six et al as a better gas-liquid mixed flow of mixed state It will be injected outside. Further, regarding the cross-sectional area of each of the flow passages 33 to 35, in the present embodiment, the cross-sectional area is gradually increased from the minimum throttle portion 30 toward the downstream side, but the cross-sectional area is set to be constant. It is also possible to do. In addition, it is also possible to set the foremost end of each flow path 33-35 to the minimum throttle part. By the way, when the cross-sectional area is gradually expanded from the smallest throttle part to the downstream side, the gas-liquid mixed flow can be accelerated, and the flow velocity of the gas-liquid mixed flow is accelerated to near or beyond the speed of sound like a Laval nozzle. It is also possible to do.
[0014]
The partitions 31 and 32 may be formed to be gradually thinner toward the downstream side. These partitions 31 and 32 can be configured to be formed by cutting on or both of the lower main body 3 and the upper main body 4, integrally formed by casting or the like, or attached later. In the present embodiment, the three flow passages 33 to 35 are formed by the partitions 31 and 32 so as to correspond to the three liquid injection ports 10 to 12, but the number of installations may be changed according to circumstances. It goes without saying that this is possible. Also, position of the end portion of the partition 31 and 32, from being set in the middle of the flow passage 33 to 35 of the gas-liquid mixed flow, the downstream side of the injection port 36 from the end portion of the partition 31 and 32 in the middle, merges each gas-liquid mixed flow which is divided by a partition 31 and 32, to eliminate their boundaries between the gas-liquid mixed flow of be injected as a boundary-free jet from a single injection port it can. In the figure, reference numeral 39 denotes a bolt fastening hole for fastening the lower body 3 and the upper body 4 together.
[0015]
Regarding the said partition, gradually larger thickness toward the downstream side of, as well as reduced gradually the width of its respective flow paths that are in Therefore formation Ri these partition toward the injection port, A configuration in which the height of the partition is gradually increased toward the downstream side so that the height of each flow passage is gradually increased toward the downstream side is also possible . That is, it is also possible to form the flow passages so that the width in the vertical direction of the flow passages gradually increases toward the downstream side so that the flow passages are wide and flat in a direction perpendicular to the direction in which the flow passages are arranged.
[0016]
Next, features of the present invention will be described. FIG. 5 is a horizontal sectional view showing a modification of the embodiment, and FIG. 6 is a longitudinal sectional view showing the embodiment partially enlarged. As shown in FIG. 5 , the injection device 50 of the present embodiment has a terminal portion 57 of partitions 55 and 56 that divides and forms a gas-liquid mixed flow passage in the nozzle portion 51 into three flow passages 52 to 54. , and set to an intermediate position upstream from the ejection nozzle 59 to 58, its downstream than those of the end portions 57 and 58, each gas-liquid is combined with the gas-liquid mixed flow which is divided by a partition 55, 56 In addition to eliminating the boundary between the mixed flows, it is characterized in that it is configured to inject as a jet flow without a boundary from one injection port 59. That is, the injection device according to the present invention uses the terminal end portion of the partition as an intermediate position of the flow path of the gas-liquid mixed flow, causes the gas-liquid mixed flow injected from each flow path to merge and spray, and It has a feature in that it is configured to be injected as an injection flow without any boundary. Incidentally, as shown in FIG. 6 , the end portions 57 and 58 of the partitions 55 and 56 in the present embodiment are formed in a stepped shape, and the mixing region at the end portions 57 and 58 of the partitions 55 and 56 is lengthened. By taking this, the abrupt merging is alleviated to achieve a smoother gas-liquid mixed flow. In addition, even when the inclined portions as shown in FIG. 7 are adopted as the shapes of the end portions 57 and 58 of the partitions 55 and 56, the abrupt merging is similarly mitigated and the smooth gas-liquid mixed flow is merged. can get.
[0017]
FIG. 8 is a longitudinal sectional view showing the main part of another embodiment of the present invention, and FIG. 9 is a partially enlarged sectional view in the horizontal direction of the embodiment. Injection device 63 of this embodiment, with respect to the front you施例has features how to supply the gas at a point changing a method in which a suction air. That is, in the injection device 63 of the present embodiment, the lower main body 64 and the upper main body 65 are formed almost symmetrically and open to the atmosphere upstream of the recesses 67 and 68 forming the installation space for the liquid supply unit 66. The suction ports 69 and 70 are formed, and inclined surfaces 71 and 72 are formed on the downstream side. A taper portion 73 formed on the downstream side of the liquid supply unit 66 is disposed inside the slopes 71 and 72 on the downstream side, and a cross-sectional area is provided between the slopes 71 and 72 and the taper portion 73 to the supply port. The gas flow passages 74 and 75 are formed so as to be gradually reduced. Therefore, in the case of the present embodiment, the liquid supplied to the liquid supply unit 66 through the pressurized liquid supply pipe 76 is ejected from the liquid ejection ports 77 to 79, and is sucked by the ejector action by the liquid ejection flow. Air is sucked from the ports 69 and 70 and injected through the gas flow passages 74 and 75. In the space on the upstream side of the minimum restricting portion 80 with the cross-sectional area reduced to the minimum, the liquid and air are mixed to form a flat gas-liquid mixed flow, and the flow passage 83 divided by the partitions 81 and 82 is formed. It flows down to a jet nozzle through -85. Gas-liquid mixed flow can also be promoted further mixed while flowing down the flow path 83 to 85, is injected as a good flat gas-liquid mixed flow of a mixed state to the injection port or al outside. Also in this embodiment , the end portions of the partitions 81 and 82 are set at an intermediate position upstream of the injection ports, and the gas-liquid mixed flow is merged between the end portions of the partitions 81 and 82 and the injection ports. In addition, it is injected as a single injection flow without a boundary. Further, in place of the gas flow passages 74 and 75 formed in the outer peripheral portion of the liquid supply portion 66, a gas flow passage (not shown) connected to the space between the liquid injection ports 77 to 79 and the minimum throttle portion 80 is provided. The gas flow path may be configured to suck the gas by the negative pressure of the space based on the ejector action of the liquid jet flow from the liquid jet ports 77 to 79.
[0018]
【The invention's effect】
In the present invention, the gas-liquid mixed flow passage is formed in a flat shape, the flat flow passage is divided into a plurality of flow passages by a partition, and the cross-sectional area of the gas-liquid mixed flow in each flow passage is divided. Since the hit mass flow rate is made substantially equal, a flat jet flow with good uniformity can be formed accurately and stably. In addition, since the liquid injection ports are provided so as to correspond to the respective flow paths divided by the partition, the mass flow rate per cross-sectional area of the gas-liquid mixed flow in these flow paths is set to be substantially equal. Individual adjustment of the amount of liquid supplied to each flow passage is very simple. Moreover , the end portion of the partition that divides and forms each flow passage is set at an intermediate position of the flow passage on the upstream side of the injection port, and each of the partitions divided by the partition is provided between the end portion of the partition and the injection port. since it is configured so as to merge the gas-liquid mixed flow, to eliminate the boundary existing between the gas-liquid mixed flow it can be injected as a boundary without good jet from one of the injection port.
[Brief description of the drawings]
1 is an exploded view showing an outline of engagement Ru real施例the present invention.
FIG. 2 is a longitudinal sectional view of the same embodiment.
FIG. 3 is a partially enlarged view of FIG. 2;
FIG. 4 is a partially enlarged sectional view in the horizontal direction of the embodiment.
FIG. 5 is a horizontal sectional view showing a modification of the embodiment .
FIG. 6 is an enlarged longitudinal sectional view showing an end portion of a partition in the same embodiment .
FIG. 7 is an enlarged longitudinal sectional view showing a modified example related to the end portion of the partition .
FIG. 8 is a longitudinal sectional view showing a main part of another embodiment according to the present invention .
FIG. 9 is a partial enlarged cross-sectional view in the horizontal direction showing the main part of the embodiment .
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Injection apparatus, 2 ... Nozzle part, 3 ... Lower main body, 4 ... Upper main body, 5 ... Liquid supply part, 6 ... Flat storage part, 7-9 ... Flow path, 10-12 ... Liquid injection port, 13 ... Liquid Supply path, 14 ... connection part, 15 ... taper part, 16 and 17 ... engagement convex part, 18 and 19 ... engagement concave part, 20 and 21 ... concave part, 22 to 25 ... slope, 26 ... connection part, 27 ... taper parts, 28, 29 ... gas flow passage, 30 ... minimum aperture portion, 31 ... partition, 33-35 ... flow passage 3 6 ... injection port, 39 ... bolt fastening holes, 5 0 ... injector, 51 ... Nozzle part, 52-54 ... flow passage, 55, 56 ... partition, 57, 58 ... end part of partition, 59 ... injection port , 63 ... injection device, 64 ... lower body, 65 ... upper body, 66 ... liquid supply Part, 67, 68 ... concave part, 69, 70 ... suction port, 71, 72 ... slope, 73 ... taper part, 74, 75 ... Body flow passage, 76 ... pressurized liquid supply pipe, 77 to 79 ... liquid injection ports, 80 ... minimum aperture portion, 81 ... partition, 83-85 ... passage

Claims (6)

In an injection device configured to inject from an injection port while mixing at least a liquid and a gas to form a gas-liquid mixed flow, the flow passage of the gas-liquid mixed flow is formed in a flat shape, and the flow passage is partitioned by a partition Divided into a plurality of flow passages along the flow, liquid injection ports are provided so as to correspond to the divided flow passages, and the mass flow rate per cross-sectional area of the gas-liquid mixed flow flowing through each flow passage is approximately It is configured to be equal , and the end portion of the partition is an intermediate position of the flow path of the gas-liquid mixed flow, and the gas-liquid mixed flow injected from each flow passage is merged and injected. A gas-liquid mixed flow injection device.   2. The gas-liquid mixed flow injection device according to claim 1, wherein a width of each flow passage is gradually widened toward a downstream side in a direction in which the divided flow passages are arranged.   2. The gas-liquid mixed flow injection device according to claim 1, wherein a width of each flow passage is gradually widened toward a downstream side in a direction orthogonal to a direction in which the divided flow passages are arranged. The gas-liquid mixed flow ejection device according to any one of claims 1 to 3 , wherein an upstream end portion of the partition is disposed at a position separated from the liquid ejection port by an appropriate distance. The gas-liquid mixing as described in any one of Claims 1-4 formed so that the cross-sectional area of the gas flow path which supplies gas to the flow path of the said gas-liquid mixed flow may be gradually reduced toward the supply port. Flow injector. The minimum throttle portion which focused cross-sectional area in the flow passage of the mixed vapor and liquid stream is provided, claim 1-5 formed so as to expand the same or gradually minimum aperture portion the cross-sectional area of the downstream side The gas-liquid mixed flow injection device according to one item.

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