JP2024017245A - injection valve - Google Patents

Abstract

[Problem] To appropriately uniformize the flow rate of liquid in an injection valve in the circumferential direction. [Solution] An injection valve 1 includes a cylindrical main body 10, a liquid supply pipe 20 connected to the main body 10 and including a liquid supply flow passage 21, a spiral flow passage 13 formed inside the wall of the main body 10 and including an upstream end communicating with the liquid supply flow passage 21, and a cylindrical flow passage 14 formed inside the wall of the main body 10, the upstream end of the cylindrical flow passage 14 being connected to the downstream end of the spiral flow passage 13 all around, and an injection port 14a being formed at the downstream end of the cylindrical flow passage 14. [Selected Figure] Figure 1

Description

The present disclosure relates to an injection valve.

2. Description of the Related Art As an injection valve that injects liquid, there is an injection valve that includes a cylindrical main body and injects liquid through a liquid flow path formed inside a wall of the main body. In such an injection valve, the injected liquid can be atomized by the air flow formed around it. An injection valve that atomizes the injected liquid by a flow of air is also called an airflow injection valve. For example, Patent Document 1 discloses an air injection valve that atomizes liquid fuel used in engines such as gas turbines.

Japanese Patent Application Publication No. 2003-214604

In an injection valve that injects liquid, it is necessary to equalize the flow rate of the liquid flowing inside the injection valve in the circumferential direction in order to appropriately atomize the liquid. In order to make the flow rate of liquid uniform in the circumferential direction, for example, in the liquid flow path within the injection valve, a constriction portion that locally reduces the cross-sectional area of the flow path may be provided. However, when the amount of liquid supplied decreases, the liquid may be dammed up at the constriction portion and the liquid may be intermittently injected. Therefore, it is desired to prevent the liquid from being intermittently injected and to appropriately equalize the flow rate of the liquid in the injection valve in the circumferential direction.

An object of the present disclosure is to provide an injection valve that can appropriately equalize the flow rate of liquid within the injection valve in the circumferential direction.

In order to solve the above problems, the injection valve of the present disclosure includes a cylindrical main body, a liquid supply pipe connected to the main body and including a liquid supply flow path, and a liquid supply pipe formed inside the wall of the main body to allow the liquid supply flow. A spiral flow path including an upstream end that communicates with the channel, and a cylindrical flow path formed inside the wall of the main body, the upstream end of the cylindrical flow path being connected to the downstream end of the spiral flow path and the entire circumference. and a cylindrical flow path that is connected to the cylindrical flow path and has an injection port formed at a downstream end of the cylindrical flow path.

The liquid supply channel may be connected to the spiral channel eccentrically with respect to the central axis of the main body.

The circumferential length of the helical flow path in a cross section perpendicular to the axial direction of the helical flow path may increase from the upstream side to the downstream side.

The cross-sectional area of the helical flow path in a cross section perpendicular to the axial direction of the helical flow path does not need to increase from the upstream side to the downstream side at any axial position.

The cross-sectional area of the helical flow path in a cross section perpendicular to the axial direction of the helical flow path may be constant regardless of the axial position.

According to the present disclosure, the flow rate of liquid within the injection valve can be uniformized appropriately in the circumferential direction.

FIG. 1 is a cross-sectional view schematically showing an injection valve according to an embodiment of the present disclosure. FIG. 2 is a side view schematically showing a spiral flow path according to an embodiment of the present disclosure. FIG. 3 is a sectional view taken along the line A1-A1 in FIG. FIG. 4 is a sectional view taken along the line A2-A2 in FIG. FIG. 5 is a sectional view taken along the line A3-A3 in FIG. FIG. 6 is a sectional view taken along the line A4-A4 in FIG. FIG. 7 is a sectional view taken along the line A5-A5 in FIG. FIG. 8 is a cross-sectional view schematically showing an injection valve according to a modification.

Embodiments of the present disclosure will be described below with reference to the accompanying drawings. The dimensions, materials, and other specific numerical values shown in the embodiments are merely examples for easy understanding, and do not limit the present disclosure unless otherwise specified. In this specification and drawings, elements having substantially the same functions and configurations are designated by the same reference numerals to omit redundant explanation, and elements not directly related to the present disclosure are omitted from illustration. do.

FIG. 1 is a cross-sectional view schematically showing an injection valve 1 according to this embodiment. The injection valve 1 may be integrally molded by a technique such as three-dimensional additive manufacturing, or may be molded by combining a plurality of members.

As shown in FIG. 1, the injection valve 1 includes a main body 10 and a liquid supply pipe 20. The main body 10 is cylindrical. A liquid flow path (specifically, a spiral flow path 13 and a cylindrical flow path 14, which will be described later) through which liquid flows is formed inside the wall of the main body 10. A liquid supply channel 21 is formed inside the liquid supply pipe 20 . The liquid supply channel 21 communicates with the liquid channel of the main body 10. In the injection valve 1, liquid is supplied to the main body 10 from a liquid supply pipe 20. The liquid supplied to the main body 10 is injected from the main body 10 after passing through the liquid flow path within the main body 10.

Examples of the liquid injected by the injection valve 1 include liquid fuel used in a combustor such as a gas turbine or a jet engine. However, the liquid injected by the injection valve 1 may be a liquid other than liquid fuel.

Specifically, the main body 10 has a substantially cylindrical shape and extends in the left-right direction in FIG. That is, the left-right direction in FIG. 1 corresponds to the axial direction of the main body 10. FIG. 1 is a cross-sectional view of the main body 10 taken along a central axis 10a. Specifically, the liquid supply pipe 20 has a substantially cylindrical shape. In the perspective of FIG. 1, the liquid supply pipe 20 extends in a direction perpendicular to the central axis 10a of the main body 10. However, from the perspective of FIG. 1, the liquid supply pipe 20 may be inclined with respect to the direction perpendicular to the central axis 10a of the main body 10. The liquid supply pipe 20 is eccentrically connected to the main body 10 with respect to the central axis 10a, as will be described later.

The left end of the main body 10 in FIG. 1 is also called the rear end. The right end of the main body 10 in FIG. 1 is also called the tip. The liquid supply pipe 20 is connected to the vicinity of the rear end of the main body 10. Therefore, liquid is supplied from the liquid supply pipe 20 to the vicinity of the rear end of the main body 10. The liquid supplied to the main body 10 flows from the rear end toward the front end within the main body 10, and is injected from the front end of the main body 10 (specifically, the injection port 14a described later). That is, the rear end side of the main body 10 corresponds to the upstream side in the flow of liquid, and the front end side of the main body 10 corresponds to the downstream side in the flow of liquid. Moreover, below, the circumferential direction of the main body 10 is also simply called the circumferential direction. The radial direction of the main body 10 is also simply referred to as the radial direction. The axial direction of the main body 10 is also simply referred to as the axial direction.

The main body 10 has a cylindrical portion 11 and a tapered portion 12. The cylindrical portion 11 and the tapered portion 12 extend along the central axis 10a and are continuous with each other. The cylindrical portion 11 is located closer to the rear end of the main body 10 than the tapered portion 12 is. The inner diameter, outer diameter, and wall thickness of the cylindrical portion 11 are constant regardless of the axial position. However, at least one of the inner diameter, outer diameter, and wall thickness of the cylindrical portion 11 may vary to some extent depending on the axial position. The tapered portion 12 tapers toward the tip. The thickness of the tapered portion 12 is constant regardless of the axial position. However, the thickness of the tapered portion 12 may vary to some extent depending on the axial position.

The inner circumferential surface of the main body 10 does not need to be bent at the connection portion between the cylindrical portion 11 and the tapered portion 12. For example, both the inner circumferential surface of the cylindrical portion 11 and the inner circumferential surface of the tapered portion 12 may taper toward the tip with the same inclination. For example, both the inner circumferential surface of the cylindrical portion 11 and the inner circumferential surface of the tapered portion 12 may extend in the axial direction. The inner circumferential surface means a surface that defines the inner diameter. The outer circumferential surface of the main body 10 does not need to be bent at the connection portion between the cylindrical portion 11 and the tapered portion 12. For example, both the outer circumferential surface of the cylindrical portion 11 and the outer circumferential surface of the tapered portion 12 may taper toward the tip with the same inclination. For example, both the outer circumferential surface of the cylindrical portion 11 and the outer circumferential surface of the tapered portion 12 may extend in the axial direction. The outer peripheral surface means a surface that defines the outer diameter.

A spiral flow path 13 and a cylindrical flow path 14 are formed inside the wall of the main body 10 as liquid flow paths through which liquid flows. The spiral flow path 13 is formed in the cylindrical portion 11 . The cylindrical flow path 14 is formed in the tapered portion 12 . The spiral flow path 13 and the cylindrical flow path 14 communicate with each other. The spiral flow path 13 is located upstream of the cylindrical flow path 14.

The spiral flow path 13 is formed in a spiral shape coaxial with the main body 10. However, the central axis of the spiral flow path 13 does not have to coincide with the central axis 10a of the main body 10. That is, the spiral flow path 13 does not have to be coaxial with the main body 10. The upstream end (that is, the rear end) of the spiral channel 13 communicates with the liquid supply channel 21 . The spiral flow path 13 is formed from near the rear end of the cylindrical portion 11 to the tip of the cylindrical portion 11 .

The cylindrical flow path 14 is formed in a cylindrical shape coaxial with the main body 10. However, the central axis of the cylindrical channel 14 does not have to coincide with the central axis 10a of the main body 10. That is, the cylindrical flow path 14 does not have to be coaxial with the main body 10. Specifically, the cylindrical flow path 14 is formed into a tapered cylindrical shape that tapers toward the tip. The upstream end (that is, the rear end) of the cylindrical channel 14 is in communication with the downstream end (that is, the tip) of the spiral channel 13. An injection port 14a is formed at the downstream end (that is, the tip) of the cylindrical flow path 14. The injection port 14a has an annular shape. The cylindrical flow path 14 is formed from the rear end of the tapered portion 12 to the tip of the tapered portion 12 .

The flow of liquid in the injection valve 1 will be explained again. In the injection valve 1 , liquid is sent from the liquid supply channel 21 of the liquid supply pipe 20 to the spiral channel 13 of the main body 10 . The liquid sent to the spiral flow path 13 passes through the spiral flow path 13 while swirling in the circumferential direction, and is sent to the cylindrical flow path 14 . The liquid sent to the cylindrical flow path 14 passes through the cylindrical flow path 14 and is injected from the injection port 14a. In FIG. 1, the flow of the liquid injected from the injection port 14a of the main body 10 is shown by an arrow F1.

In the injection valve 1, an air flow indicated by an arrow F2 occurs radially inward with respect to the liquid injected from the injection port 14a. Air, indicated by arrow F2, flows through the central cavity of body 10 towards the tip. The central cavity of the main body 10 may be provided with an element (for example, a swirling vane, etc.), not shown, that swirls the air as indicated by the arrow F2. In this case, the air indicated by arrow F2 flows toward the tip while swirling in the circumferential direction. Further, an air flow indicated by an arrow F3 is generated radially outward with respect to the liquid injected from the injection port 14a. Air, indicated by arrow F3, flows radially outward with respect to the tapered portion 12 of the main body 10 toward the tip. A not-shown element (for example, a swirling vane, etc.) that swirls the air may be provided on the outside in the radial direction with respect to the tapered portion 12, as indicated by the arrow F3. In this case, the air indicated by arrow F3 flows toward the tip while swirling in the circumferential direction. The liquid injected from the injection port 14a of the main body 10 is atomized by air flows indicated by arrows F2 and F3.

The details of the shape of the spiral flow path 13 of the injection valve 1 will be described below with reference to FIGS. 2 to 7.

FIG. 2 is a side view schematically showing the spiral flow path 13 according to this embodiment. FIG. 2 corresponds to a side view of the spiral flow path 13 when the injection valve 1 is viewed from the same viewpoint as FIG. In FIG. 2, components other than the liquid supply channel 21 and the spiral channel 13 are indicated by two-dot chain lines. Moreover, in FIG. 2, illustration of a portion of the injection valve 1 on the distal side of the spiral flow path 13 (specifically, the tapered portion 12 and the cylindrical flow path 14) is omitted.

3 to 7 are cross-sectional views of the helical flow path 13 at each axial position in a cross section perpendicular to the central axis 10a. Specifically, FIG. 3 is a sectional view taken along the line A1-A1 in FIG. FIG. 4 is a sectional view taken along the line A2-A2 in FIG. FIG. 5 is a sectional view taken along the line A3-A3 in FIG. FIG. 6 is a sectional view taken along the line A4-A4 in FIG. FIG. 7 is a sectional view taken along the line A5-A5 in FIG.

As shown in FIG. 3, the liquid supply channel 21 is eccentrically connected to the spiral channel 13 with respect to the central axis 10a of the main body 10. That is, the extension line of the liquid supply channel 21 does not pass through the central axis 10a of the main body 10. Thereby, the liquid sent from the liquid supply channel 21 to the spiral channel 13 becomes easier to swirl in the circumferential direction in the spiral channel 13.

In the example of FIG. 3, the liquid supply channel 21 is connected to the spiral channel 13 in the tangential direction of the main body 10. However, in the case where the liquid supply channel 21 is eccentrically connected to the spiral channel 13 with respect to the central axis 10a of the main body 10, the connection direction of the liquid supply channel 21 and the spiral channel 13 is It does not have to be in the tangential direction. Further, the liquid supply channel 21 does not need to be eccentric with respect to the central axis 10a of the main body 10. Even in that case, the liquid sent to the spiral flow path 13 can swirl in the circumferential direction by being guided by the spiral flow path 13.

As shown in FIGS. 3 to 7, the circumferential length D1 of the spiral flow path 13 in a cross section perpendicular to the central axis 10a increases from the upstream side to the downstream side. That is, the circumferential length D1 at each axial position of the spiral flow path 13 increases from the upstream side to the downstream side. Specifically, the circumferential length D1 of the spiral flow path 13 increases in the order of the A1-A1 section, the A2-A2 section, the A3-A3 section, the A4-A4 section, and the A5-A5 section. In the A1-A1 section, the A2-A2 section, the A3-A3 section, and the A4-A4 section, the spiral flow path 13 has an arc shape. On the other hand, in the A5-A5 cross section, the spiral flow path 13 has a circular shape. That is, the spiral flow path 13 exists over the entire circumference in the circumferential direction at the downstream end. The downstream end of such a spiral flow path 13 is connected to the upstream end of the cylindrical flow path 14. That is, the upstream end of the cylindrical flow path 14 is connected to the downstream end of the spiral flow path 13 around the entire circumference.

The cross-sectional area of the spiral flow path 13 in a cross section perpendicular to the central axis 10a is constant regardless of the axial position. Specifically, as shown in FIGS. 3 to 7, the radial length D2 of the spiral flow path 13 in a cross section perpendicular to the central axis 10a becomes shorter from the upstream side toward the downstream side. That is, the radial length D2 at each axial position of the spiral flow path 13 becomes shorter from the upstream side to the downstream side. More specifically, the radial length D2 of the spiral flow path 13 becomes shorter in the order of A1-A1 cross section, A2-A2 cross section, A3-A3 cross section, A4-A4 cross section, and A5-A5 cross section. As a result, the cross-sectional area of the spiral flow path 13 in a cross section perpendicular to the central axis 10a remains constant regardless of the axial position.

As described above, the injection valve 1 includes a cylindrical main body 10, a liquid supply pipe 20 connected to the main body 10 and including a liquid supply channel 21, and a liquid supply pipe 20 formed inside the wall of the main body 10, A spiral flow path 13 including an upstream end communicating with the flow path 21, and a cylindrical flow path 14 formed inside the wall of the main body 10, the upstream end of the cylindrical flow path 14 being a spiral flow path. The cylindrical flow path 14 is connected to the downstream end of the cylindrical flow path 13 around the entire circumference, and has an injection port 14a formed at the downstream end of the cylindrical flow path 14. Thereby, the liquid flowing inside the injection valve 1 can be swirled by the spiral flow path 13, so that the flow rate of the liquid inside the injection valve 1 can be made uniform in the circumferential direction. Furthermore, by connecting the upstream end of the cylindrical flow path 14 to the downstream end of the helical flow path 13 around the entire circumference, liquid can be smoothly sent from the helical flow path 13 to the cylindrical flow path 14 . Furthermore, in the liquid flow path in the main body 10, there is no need to provide a restrictor where the cross-sectional area of the flow path becomes locally small. The liquid is dammed up by the part, and it is possible to suppress the liquid from being intermittently sprayed. Therefore, it is possible to prevent the liquid from being intermittently injected and to appropriately equalize the flow rate of the liquid in the injection valve 1 in the circumferential direction.

In particular, in the injection valve 1, the liquid supply channel 21 is eccentrically connected to the spiral channel 13 with respect to the central axis 10a of the main body 10. Thereby, the liquid sent from the liquid supply channel 21 to the spiral channel 13 becomes easier to swirl in the circumferential direction in the spiral channel 13.

In particular, in the injection valve 1, the circumferential length D1 of the helical flow path 13 in the cross section perpendicular to the axial direction of the helical flow path 13 (in the above example, the cross section perpendicular to the central axis 10a) is It becomes longer as it goes downstream. Thereby, the circumferential length D1 of the helical flow path 13 is suppressed from rapidly changing locally, and the upstream end of the cylindrical flow path 14 is connected to the downstream end of the helical flow path 13 on the entire circumference. can be connected. Therefore, in the spiral flow path 13, it is possible to suppress disturbances in the flow of the liquid due to local rapid changes in the flow velocity of the liquid.

In particular, in the injection valve 1, the cross-sectional area of the helical flow path 13 at a cross section perpendicular to the axial direction of the helical flow path 13 (in the above example, the cross section perpendicular to the central axis 10a) is The directional position also does not increase from the upstream side to the downstream side. As a result, when the amount of liquid supplied is small or the supply pressure of liquid is low, the liquid is dammed up by the portion of the spiral flow path 13 whose cross-sectional area increases from the upstream side to the downstream side. , it is possible to suppress the liquid from being intermittently sprayed.

In particular, in the injection valve 1, the cross-sectional area of the helical flow path 13 at a cross section perpendicular to the axial direction of the helical flow path 13 (in the above example, the cross section perpendicular to the central axis 10a) is It is constant regardless of Thereby, it is properly ensured that the cross-sectional area of the spiral flow path 13 in a cross section perpendicular to the axial direction of the spiral flow path 13 does not increase from the upstream side to the downstream side at any axial position. can be realized. Furthermore, by making the cross-sectional area of the helical flow path 13 constant regardless of the axial position, the flow rate of the liquid flowing through the helical flow path 13 can be made constant regardless of the axial position. turbulence in the flow can be more effectively suppressed.

In the above, as a result of the passage cross-sectional area of the spiral passage 13 at a cross section orthogonal to the axial direction of the spiral passage 13 being constant regardless of the axial position, the passage cross-sectional area is The directional position also does not increase from the upstream side to the downstream side. However, the cross-sectional area of the helical flow path 13 in a cross section perpendicular to the axial direction of the helical flow path 13 may not be constant regardless of the axial position. For example, the cross-sectional area of the spiral flow path 13 in a cross section perpendicular to the axial direction of the spiral flow path 13 may become smaller from the upstream side toward the downstream side. Even in that case, the cross-sectional area of the helical flow path 13 in a cross section perpendicular to the axial direction of the helical flow path 13 does not increase from the upstream side to the downstream side at any axial position.

FIG. 8 is a cross-sectional view schematically showing an injection valve 1A according to a modification. Specifically, FIG. 8 is a cross-sectional view of the injection valve 1A in a cross section corresponding to the A1-A1 cross section in FIG. The injection valve 1A differs from the injection valve 1 described above in the positional relationship between the main body 10 and the liquid supply pipe 20.

As shown in FIG. 8, in the injection valve 1A, the liquid supply pipe 20 has a vertical portion 20a and a bent portion 20b. The vertical portion 20a is located upstream of the bent portion 20b. The vertical portion 20a extends in the vertical direction perpendicular to the central axis 10a of the main body 10. That is, the extension line of the vertical portion 20a passes through the central axis 10a of the main body 10. The downward direction in FIG. 8 is the vertical downward direction. As shown in FIG. 8, the vertical portion 20a extends downward from the bottom of the main body 10. The bent portion 20b is bent with respect to the vertical portion 20a. The liquid supply channel 21 is bent inside the liquid supply pipe 20 and is connected to the spiral channel 13 in the tangential direction of the main body 10 . Thereby, the liquid sent from the liquid supply channel 21 to the spiral channel 13 becomes easier to swirl in the circumferential direction in the spiral channel 13.

As described above, in the injection valve 1A, the liquid supply pipe 20 has a vertical portion 20a that extends in the vertical direction orthogonal to the central axis 10a of the main body 10. Thereby, the main body 10 can be supported from directly below by the liquid supply pipe 20. Therefore, the main body 10 can be supported more stably.

Although the embodiments of the present disclosure have been described above with reference to the accompanying drawings, it goes without saying that the present disclosure is not limited to such embodiments. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the claims, and it is understood that these naturally fall within the technical scope of the present disclosure. be done.

In the above, the injection valve 1 and the injection valve 1A have been described with reference to each drawing. However, the components may be changed, added, or deleted as appropriate to the injection valve 1 and the injection valve 1A. For example, in the injection valve 1 and the injection valve 1A, an element (such as a swirl vane) that promotes swirling of the liquid may be added to the tapered portion 12. Thereby, the liquid flowing within the injection valve 1 can be swirled more effectively.

1 Injection valve 1A Injection valve 10 Main body 10a Central axis 13 Spiral channel 14 Cylindrical channel 14a Injection port 20 Liquid supply pipe 21 Liquid supply channel

Claims (5)

A cylindrical body,
a liquid supply pipe connected to the main body and including a liquid supply channel;
a spiral flow path formed inside the wall of the main body and including an upstream end communicating with the liquid supply flow path;
a cylindrical flow path formed inside the wall portion of the main body, the upstream end of the cylindrical flow path being connected to the downstream end of the spiral flow path around the entire circumference; a cylindrical channel having an injection port formed at a downstream end of the channel;
Equipped with
injection valve. The liquid supply channel is connected to the spiral channel eccentrically with respect to the central axis of the main body.
The injection valve according to claim 1. The circumferential length of the spiral flow path in a cross section perpendicular to the axial direction of the spiral flow path increases from the upstream side to the downstream side.
The injection valve according to claim 1. The cross-sectional area of the spiral flow path in a cross section perpendicular to the axial direction of the spiral flow path does not increase from the upstream side to the downstream side at any axial position.
The injection valve according to any one of claims 1 to 3. The cross-sectional area of the spiral flow path in a cross section perpendicular to the axial direction of the spiral flow path is constant regardless of the axial position.
The injection valve according to claim 4.

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