Ejector

Abstract

The embodiment of the utility model provides an ejector which comprises an ejector shell, and the ejector shell defines a negative pressure generation chamber and a diffusion chamber. The diameter of the negative pressure generating chamber decreases in the flowing direction, the diameter of the diffusion chamber increases in the flowing direction, the inner surface of the negative pressure generating chamber is formed by rotating a first generatrix around a transverse central axis, and the inner surface of the diffusion chamber is formed by rotating a second generatrix around the transverse central axis. At least one of the first bus bar and the second bus bar is an arc line protruding toward the transverse central axis. The ejector provided by the embodiment of the utility model can effectively eject the target fluid when the working fluid is high in flow or low in flow.

Description

Technical Field

[0001] This application relates to the field of fluid ejection technology, and in particular to an ejector. Background Technology

[0002] Unless otherwise stated herein, the methods described in this section are not prior art to the claims listed below, and are not acknowledged as prior art by virtue of their inclusion in this section.

[0003] The ejector in a hydrogen fuel cell engine system uses high-pressure hydrogen injection to entrain low-pressure hydrogen-containing gas mixture discharged from the fuel cell stack. This mixture is then pressurized and recirculated back into the fuel cell stack for electrochemical reactions. The ejector is characterized by no additional power loss, no moving parts, a fixed internal and external structure, and simple use and maintenance. However, due to the complex and varied operating conditions of actual fuel cell engines, the required high-pressure hydrogen flow rate is wide-ranging. Traditional ejectors cannot effectively entrain hydrogen under low-flow conditions, creating an ejection dead zone and significantly degrading their performance. Utility Model Content

[0004] The purpose of this application is to provide an ejector to solve the problems pointed out in the background art or other similar problems.

[0005] To achieve the above objectives, embodiments of this application provide an ejector, comprising an ejector housing. The ejector housing defines: a first supply port for receiving a working fluid; a second supply port for receiving a target fluid; a negative pressure generating chamber for generating negative pressure using the working fluid; and a diffusion chamber communicating with the negative pressure generating chamber for allowing the working fluid and the target fluid to flow in a flow direction parallel to the transverse central axis of the ejector housing. The diameter of the negative pressure generating chamber decreases along the flow direction, and the diameter of the diffusion chamber increases along the flow direction. The inner surface of the negative pressure generating chamber is formed by rotating a first generatrix around the transverse central axis, and the inner surface of the diffusion chamber is formed by rotating a second generatrix around the transverse central axis. At least one of the first generatrix and the second generatrix is ​​an arc protruding towards the transverse central axis.

[0006] In some embodiments, at least one of the first and second busbars is configured to extend in a curved manner along a path parallel to at least a portion of the profile of the upper arc of a predetermined airfoil.

[0007] In some embodiments, the first busbar is configured to bulge toward the transverse central axis and extend curvingly along a path parallel to at least a portion of the contour of the upper arc of the preset airfoil to the transition position between the second supply port and the negative pressure generating chamber.

[0008] In some embodiments, the upper arc of the preset airfoil includes a first partial profile extending from the leading edge of the preset airfoil to the position of maximum camber of the preset airfoil, and a second partial profile extending from the position of maximum camber to the trailing edge of the preset airfoil. The first generatrix is ​​configured to extend curvilinearly along a path parallel to at least a portion of the first partial profile, and / or the second generatrix is ​​configured to extend curvilinearly along a path parallel to at least a portion of the second partial profile.

[0009] In some embodiments, the angle between the chord of the preset airfoil and the transverse central axis is α, where -45°≤α≤+45°.

[0010] In some embodiments, the preset airfoil is a low Reynolds number airfoil.

[0011] In some embodiments, the ejector housing further defines a mixing chamber, wherein the negative pressure generating chamber, the mixing chamber, and the diffusion chamber are sequentially connected, and the diameter of the mixing chamber is not greater than the minimum diameter of the negative pressure generating chamber and not greater than the minimum diameter of the diffusion chamber. The ejector further includes a nozzle disposed along the transverse central axis at the first supply port for injecting the working fluid toward the negative pressure generating chamber.

[0012] In some embodiments, the diameter of the mixing chamber is D, and the vertical distance between the outer surface of the nozzle and the inner surface of the negative pressure generating chamber is d1, where 0 <d1≤1.5D。

[0013] In some embodiments, the nozzle has a main nozzle and a plurality of secondary nozzles spaced apart around the main nozzle.

[0014] In some embodiments, the diameter of the mixing chamber is D, and the vertical distance between the central axis of the main nozzle and the inner surface of the mixing chamber is d2, where 0 <d2≤0.5D。

[0015] In some embodiments, the diameter of the mixing chamber is D, and the vertical distance between the central axis of the secondary nozzle and the inner surface of the mixing chamber is d3, where 0 <d3<0.5D。

[0016] The ejector of this application embodiment can effectively eject the target fluid whether the working fluid is at a high or low flow rate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments or prior art of this specification, the drawings used in the description of the embodiments or prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0018] Figure 1 This is a schematic diagram of the ejector structure according to an embodiment of this application;

[0019] Figure 2 This is a cross-sectional view of an ejector according to an embodiment of this application;

[0020] Figure 3 This is a cross-sectional view of an ejector according to another embodiment of this application;

[0021] Figure 4 This is a cross-sectional view of an ejector according to another embodiment of this application;

[0022] Figure 5 yes Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 6 This is a schematic diagram of a preset airfoil in an embodiment of this application.

[0024] Figure label:

[0025] 10. Ejector housing;

[0026] 101. First supply port; 102. Second supply port; 103. Negative pressure generation chamber; 104. Diffusion chamber;

[0027] 105. Discharge outlet; 106. First busbar; 108. Second busbar; 109. Transition location;

[0028] 110. Mixing chamber; 112. Annular channel; 113. Detection port;

[0029] 20. Preset airfoil; 21. First preset airfoil; 22. Second preset airfoil;

[0030] 201. Upper arc; 202. Leading edge; 203. Trailing edge; 204. First part of the outline;

[0031] 205. Second part outline; 206. Chord; 207. Critical point;

[0032] 30. Nozzle; 301. Main nozzle; 302. Secondary nozzle; 303. Conical outer surface;

[0033] 40. Nozzle mounting base; 401. Annular flange; 402. Sealing ring;

[0034] F1, working fluid; F2, target fluid; X, transverse center axis; Y, longitudinal axis. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this specification, and not all embodiments. Based on the embodiments in this specification, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this specification.

[0036] To make it easier to understand, we will first introduce the ejection principle of the ejector.

[0037] The working fluid (e.g., high-pressure pure hydrogen gas) enters the ejector through the first supply port, while the target fluid (e.g., a hydrogen-containing mixture discharged from a fuel cell engine stack) enters through the second supply port. According to Bernoulli's principle, the working fluid's pressure, velocity, and temperature change along the internal flow channel towards the ejector's outlet, creating a localized low pressure (or negative pressure) in a localized region of the internal flow channel. When the pressure in this negative pressure region is lower than the pressure at the second supply port, the target fluid is drawn into the internal flow channel from the second supply port under the influence of the pressure difference, mixes with the working fluid, and is then discharged from the outlet. The ratio of the target fluid's mass flow rate to the working fluid's mass flow rate is called the ejection ratio or entrainment ratio.

[0038] The inventors discovered that for conventional ejectors, when the mass flow rate of the working fluid gradually decreases, it is insufficient to generate enough negative pressure in the internal flow channel of the ejector to eject or entrain the target fluid, thus failing to effectively eject or entrain the target fluid and creating a dead zone inside the ejector.

[0039] In addition, the inventors also discovered that for conventional ejectors, as the mass flow rate of the working fluid gradually decreases, the discharge pressure of the mixture of the working fluid and the target fluid when it is discharged from the outlet also gradually decreases.

[0040] To address at least one of the problems of insufficient ejection and insufficient discharge pressure under low flow conditions, embodiments of this application provide an improved ejector.

[0041] The embodiments of the ejector of this application will now be described with reference to the accompanying drawings.

[0042] like Figures 1 to 4As shown, the ejector includes an ejector housing 10, which defines a first supply port 101, a second supply port 102, a negative pressure generating chamber 103, a diffusion chamber 104, and an outlet 105. The first supply port 101 receives a working fluid F1, and the second supply port 102 receives a target fluid F2. The negative pressure generating chamber 103 generates a negative pressure using the working fluid F1. The diffusion chamber 104 communicates with the negative pressure generating chamber 103 and supplies working fluid F1 and target fluid F2 along the flow direction W (e.g., ...). Figure 2 (As shown) The fluid flows toward the outlet 105. The flow direction W is parallel to the transverse central axis X of the ejector housing 10. The outlet 105 is used to discharge the working fluid F1 and the target fluid F2 after mixing.

[0043] In this embodiment, the diameter of the negative pressure generating chamber 103 decreases along the flow direction, while the diameter of the diffusion chamber 104 increases along the flow direction. The inner surface of the negative pressure generating chamber 103 is formed by rotating a first generatrix 106 around the transverse central axis X (also referred to as the transverse centerline), and the inner surface of the diffusion chamber 104 is formed by rotating a second generatrix 108 around the transverse central axis X. At least one of the first generatrix 106 and the second generatrix 108 is an arc convex towards the transverse central axis X. By constructing the generatrix of at least one of the inner surfaces of the negative pressure generating chamber 103 and the diffusion chamber 104 as an arc convex towards the transverse central axis X, this embodiment can guide the gas to flow closer to the wall, effectively enhancing the Coanda Effect of gas flow along the wall.

[0044] Specifically, in this embodiment of the application, by constructing the inner surface of the negative pressure generating chamber 103 and / or the diffusion chamber 104 as an arc protruding toward the transverse central axis X, the fluid can be guided to flow along the convex curved surface without immediately separating from it, so that the overall flow of the fluid is biased toward a laminar state, reducing turbulent eddies in local areas; at the same time, the fluid flowing along the convex curved surface has a longer motion path and has a higher flow velocity in the laminar state at a low Reynolds number.

[0045] When the first generatrix 106 of the negative pressure generating chamber 103 is constructed as an arc that reduces the diameter of the negative pressure generating chamber 103 along the flow direction, the flow velocity of the working fluid F1 along the inner surface of the negative pressure generating chamber 103 can be increased. When the total fluid pressure remains constant, the increase in flow velocity will increase the dynamic pressure, thereby reducing the static pressure. That is, a lower negative pressure region can be formed near the central axis of the flow channel (i.e., near the transverse central axis X inside the negative pressure generating chamber 103), thereby increasing the pressure difference between the negative pressure generating chamber 103 and the second supply port 102. The increased pressure difference can more effectively draw the target fluid F2 from the second supply port 102 into the negative pressure generating chamber 103. Even if the flow rate of the working fluid F1 is small, sufficient negative pressure can be generated due to the increase in flow velocity, effectively drawing the target fluid F2 from the second supply port 102 into the negative pressure generating chamber 103, avoiding the formation of an ejection dead zone in the ejector under low flow conditions, and improving the ejection ratio of the ejector under low flow conditions.

[0046] Similarly, when the second generatrix 108 of the diffuser 104 is constructed as an arc that increases the diameter of the diffuser 104 along the flow direction, the velocity component of the mixed fluid along the transverse central axis X direction when the mixed fluid of the working fluid F1 and the target fluid F2 flows along the inner surface of the diffuser 104 can be reduced, thereby increasing the static pressure of the mixed fluid when it is discharged from the outlet 105. Even if the pressure and flow rate of the working fluid F1 when it enters the first supply port 101 are small, a higher static pressure can be obtained.

[0047] In a preferred embodiment, at least one of the first generatrix 106 and the second generatrix 108 is configured to extend in a curved manner along a path parallel to at least a portion of the profile of the upper arc 201 of the preset airfoil 20 (also referred to as the upper surface profile of the preset airfoil 20). In other words, at least one of the first generatrix 106 and the second generatrix 108 is configured as a part of the upper arc 201 of the preset airfoil 20.

[0048] In this embodiment, the generatrix of the inner surface of at least one of the negative pressure generating chamber 103 and the diffusion chamber 104 is constructed to extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20, so that the curved shape of the inner surface of the negative pressure generating chamber 103 and / or the diffusion chamber 104 is consistent with the curved shape of the airfoil profile. The curved wall surface constructed thereby can more effectively guide the gas to flow closer to the wall surface and more effectively enhance the Coanda effect of the gas flowing along the wall surface.

[0049] The preset airfoil 20 can be determined according to actual needs. Taking the design of the first generatrix 106 as an example, in actual design, an original airfoil can be provided first, and a part of the upper arc 201 of the original airfoil can be used as the first generatrix 106 of the inner surface of the negative pressure generating chamber 103. Then, the design parameters of the original airfoil, such as chord length, maximum thickness, maximum camber, angle of attack, etc., can be adjusted to change the bending shape and size of the first generatrix 106 until the desired Coanda effect is generated in the negative pressure generating chamber 103. For example, after the negative pressure generating chamber 103 of the current airfoil design is initially determined, working fluid F1 is supplied to the first supply port 101 and target fluid F2 is supplied to the second supply port 102. Then, the actual ejection ratio is calculated based on the actual mass flow rates of the working fluid F1 entering the first supply port 101 and the target fluid F2 entering the second supply port 102. If the actual ejection ratio is consistent with the expected ejection ratio, the current airfoil can be used as the preset airfoil 20. Otherwise, the airfoil can be adjusted until the actual ejection ratio is consistent with the expected ejection ratio. The airfoil that is finally adjusted and determined is the preset airfoil 20.

[0050] In a first alternative embodiment, such as Figure 2 As shown, the first generatrix 106 of the inner surface of the negative pressure generating chamber 103 is configured to bulge towards the transverse central axis X and extend curvedly along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20. The inner surface of the diffusion chamber 104 can be constructed similarly to the inner surface of a conventional ejector's diffusion chamber 104; for example, the second generatrix 108 of the inner surface of the diffusion chamber 104 can be a straight line. The negative pressure generating chamber 103 in this embodiment can improve the ejection ratio of the ejector under low flow conditions.

[0051] In a second alternative embodiment, such as Figure 3 As shown, the second generatrix 108 of the inner surface of the diffuser chamber 104 is configured to bulge towards the transverse central axis X and extend curvedly along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20. The inner surface of the negative pressure generating chamber 103 can have the same configuration as the inner surface of the negative pressure generating chamber 103 of a conventional ejector; for example, the first generatrix 106 of the inner surface of the negative pressure generating chamber 103 can be a straight line or an arc. The diffuser chamber 104 in this embodiment can increase the static pressure of the mixed fluid when it exits from the outlet 105.

[0052] In a third alternative embodiment, such as Figure 4As shown, the first generatrix 106 of the inner surface of the negative pressure generating chamber 103 is configured to bulge towards the transverse central axis X and extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20. Similarly, the second generatrix 108 of the inner surface of the diffuser chamber 104 is configured to bulge towards the transverse central axis X and extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20. In this embodiment, the negative pressure generating chamber 103 can improve the ejection ratio of the ejector under low flow conditions, and the diffuser chamber 104 can increase the static pressure of the mixed fluid when it is discharged from the outlet 105.

[0053] like Figure 4 As shown, in the aforementioned third embodiment, the preset airfoil 20 corresponding to the first generatrix 106 and the preset airfoil 20 corresponding to the second generatrix 108 can be the same airfoil or different airfoils. In specific implementation, the same or different airfoils can be selected according to the actual working conditions. The same airfoil mentioned here refers to the airfoil having the same shape, size, and the same angle (referred to as pitch angle) between the chord line 206 of the airfoil and the transverse central axis X. Different airfoils refer to airfoils having at least one different shape, size, or pitch angle.

[0054] For example, such as Figure 4 As shown, the first generatrix 106 is configured to extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc 201 of the first preset airfoil 21, and the second generatrix 108 is configured to extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc 201 of the second preset airfoil 22. The first preset airfoil 21 and the second preset airfoil 22 may be the same airfoil or different airfoils.

[0055] Specifically, for example, the first preset airfoil 21 and the second preset airfoil 22 have the same shape and size, but different pitch angles; or, the first preset airfoil 21 and the second preset airfoil 22 have the same shape and pitch angle, but different sizes; or, the first preset airfoil 21 and the second preset airfoil 22 have the same size and pitch angle, but different shapes.

[0056] like Figure 2 and Figure 4As shown, in the aforementioned first and third embodiments, exemplarily, the first generatrix 106 is configured to bulge towards the lateral central axis X and extend curvingly along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20 to the transition position 109 between the second supply port 102 and the negative pressure generating chamber 103, thereby reducing the intake resistance and turbulence of the target fluid F2 as it enters the negative pressure generating chamber 103 from the second supply port 102. For example, the transition position 109 between the inner surface of the second supply port 102 and the inner surface of the negative pressure generating chamber 103 may correspond to the leading edge 202 position of the preset airfoil 20 corresponding to the first generatrix 106.

[0057] like Figure 3 and Figure 4 As shown, in the aforementioned second and third embodiments, exemplarily, the second generatrix 108 is configured to bulge toward the transverse central axis X and extend curvedly along a path parallel to at least a portion of the contour of the upper arc 201 of the preset airfoil 20 to the outlet 105, thereby reducing the velocity component of the mixed fluid in the transverse central axis X direction when it exits from the outlet 105. For example, the outlet 105 may correspond to the position of the trailing edge 203 of the preset airfoil 20 corresponding to the second generatrix 108.

[0058] like Figures 2 to 4 as well as Figure 6 As shown, in the aforementioned first to third embodiments, exemplarily, the upper arc 201 of the preset airfoil 20 includes a first partial profile 204 extending from the leading edge 202 of the preset airfoil 20 to the maximum camber position of the preset airfoil 20, and a second partial profile 205 extending from the maximum camber position to the trailing edge 203 of the preset airfoil 20; the first generatrix 106 is configured to extend curvedly along a path parallel to at least a portion of the first partial profile 204, and / or the second generatrix 108 is configured to extend curvedly along a path parallel to at least a portion of the second partial profile 205. In other words, the first generatrix 106 is consistent with at least a portion of the first partial profile 204, and the second generatrix 108 is consistent with at least a portion of the second partial profile 205.

[0059] Figure 6 The coordinate system of an exemplary preset airfoil 20 is shown. The x-axis of this coordinate system is parallel to the transverse central axis X of the ejector, and the y-axis is parallel to the longitudinal axis Y of the ejector. The x-coordinate of the leading edge 202 of the preset airfoil 20 is 0, the x-coordinate of the maximum camber position is Xf, and the x-coordinate of the trailing edge 203 is Xc. The first part of the upper arc 201, profile 204, and the second part, profile 205, are separated by a critical point 207. For ease of understanding, a portion of the first part of profile 204 can be considered as the first generatrix 106, and a portion of the second part of profile 205 can be considered as the second generatrix 108. Figure 6In the coordinate system shown, assuming the x-coordinate of the starting point of the first generatrix 106 is Xs1 and the x-coordinate of the ending point is Xe1, then 0 ≤ Xs1 < Xf, 0 < Xe1 ≤ Xf, and Xs1 < Xe1; similarly, assuming the x-coordinate of the starting point of the second generatrix 108 is Xs2 and the x-coordinate of the ending point is Xe2, then Xf ≤ Xs2 < Xc, Xf < Xe2 ≤ Xc, and Xs2 < Xe2.

[0060] It is understandable that, since the curvature of the first part of the upper arc 201 of the airfoil is greater than the curvature of the second part of the profile 205, by constructing the first generatrix 106 to extend along a path parallel to the first part of the profile 204, compared to constructing the first generatrix 106 to extend along a path parallel to the second part of the profile 205, the first generatrix 106 has a larger curvature, thereby giving the inner surface of the negative pressure generating chamber 103 a larger curvature.

[0061] Similarly, by configuring the second generatrix 108 to extend along a path parallel to the second partial profile 205, compared to configuring the second generatrix 108 to extend along a path parallel to the first partial profile 204, the second generatrix 108 has a smaller curvature, thereby giving the inner surface of the diffusion chamber 104 a smaller curvature.

[0062] The first profile 204 corresponding to the first generatrix 106 and the second profile 205 corresponding to the second generatrix 108 can belong to the same airfoil or to different airfoils. For example, the first generatrix 106 and the second generatrix 108 extend along paths parallel to the first profile 204 and the second profile 205 of the same preset airfoil 20, respectively. Alternatively, the first generatrix 106 can extend along a path parallel to the first profile 204 of the first preset airfoil 21, while the second generatrix 108 can extend along a path parallel to the second profile 205 of the second preset airfoil 22.

[0063] The following provides some optional specific implementation schemes for the first to third embodiments described above. It should be noted that, unless otherwise stated, the specific implementation schemes described below should be understood as optional solutions provided for any of the first to third embodiments. The preset airfoil 20 mentioned below, unless otherwise stated, may refer to the airfoil corresponding to the first generatrix 106 or the airfoil corresponding to the second generatrix 108; it may refer to the same airfoil or different airfoils.

[0064] In one alternative technical solution, such as Figure 6 As shown, the angle (i.e., pitch angle) between the chord line 206 of the pre-defined airfoil 20 and the transverse central axis X is α, -45°≤α≤+45°.

[0065] For example, the pitch angle between the chord 206 of the first preset airfoil 21 corresponding to the first generatrix 106 and the transverse central axis X is α1, -45°≤α1≤+45°, and the pitch angle between the chord 206 of the second preset airfoil 22 corresponding to the second generatrix 108 and the transverse central axis X is α2, -45°≤α2≤+45°, where α1 and α2 can be equal or unequal.

[0066] In this design, by setting the pitch angle α of the preset airfoil 20 to -45° to +45°, the inner surface of the negative pressure generating chamber 103 and / or diffuser chamber 104 constructed based on the preset airfoil 20 is more conducive to gas adhesion. This guides the airflow closer to the inner surface, reducing gas separation and enhancing the Coanda effect. Furthermore, the constructed inner surface also reduces intake drag and is easier to manufacture.

[0067] In some alternative technical solutions, the preset airfoil 20 is a low Reynolds number airfoil. For example, the preset airfoil 20 has a Reynolds number of less than 5 million. Further, the preset airfoil 20 can have a Reynolds number of 100,000 to 1.5 million.

[0068] In one alternative technical solution, such as Figures 2 to 4 As shown, the ejector housing 10 also defines a mixing chamber 110, and the negative pressure generating chamber 103, the mixing chamber 110 and the diffusion chamber 104 are in sequential fluid communication. The diameter D of the mixing chamber 110 is not greater than the minimum diameter of the negative pressure generating chamber 103 and not greater than the minimum diameter of the diffusion chamber 104. In other words, the mixing chamber 110 is the smallest diameter part of the internal flow channel of the ejector housing 10.

[0069] For example Figures 2 to 4 As shown, the mixing chamber 110 extends continuously from the rear end of the negative pressure generating chamber 103 along the transverse central axis X to the front end of the diffusion chamber 104. The mixing chamber 110 has an almost constant diameter D, rather than a varying diameter like that of the negative pressure generating chamber 103 and the diffusion chamber 104. The working fluid F1 and the target fluid F2 can be mixed more thoroughly when flowing through the mixing chamber 110.

[0070] In one alternative technical solution, such as Figures 2 to 4 As shown, the ejector also includes a nozzle 30, which is disposed at the first supply port 101 along the transverse central axis X, for spraying working fluid F1 toward the negative pressure generating chamber 103.

[0071] like Figures 2 to 4As shown, the central axis of the nozzle 30 coincides with the transverse central axis X, the second supply port 102 is arranged along the longitudinal axis Y, and the longitudinal axis Y can be perpendicular to the transverse central axis X and the central axis of the nozzle 30. At least part of the nozzle 30 extends into the negative pressure generating chamber 103. In other words, an annular channel 112 is formed between the outer surface of the nozzle 30 and the inner surface of the negative pressure generating chamber 103, and the second supply port 102 is in fluid communication with the negative pressure generating chamber 103 through the annular channel 112.

[0072] Continue to refer to Figures 2 to 4 , the nozzle 30 has a main injection hole 301 and a plurality of auxiliary injection holes 302 arranged at intervals around the main injection hole 301 for ejecting the working fluid F1 towards the negative pressure generating chamber 103. For example, the main injection hole 301 can be located on the transverse central axis X and parallel to the transverse central axis X. The plurality of auxiliary injection holes 302 are arranged at intervals around the transverse central axis X, and each auxiliary injection hole 302 is spaced apart from the main injection hole 301 in the direction along the transverse central axis X and in the direction along the longitudinal axis Y. Each auxiliary injection hole 302 can be parallel to the transverse central axis X. For example, the ratio of the diameter of the main injection hole 301 to the diameter of each auxiliary injection hole 302 can be 1 to 10. The number of the main injection holes 301 can be one, and the number of the auxiliary injection holes 302 can be four.

[0073] Another example is Figures 2 to 4 As shown, the nozzle 30 has a conical outer side surface 303, and the conical outer side surface 303 faces the inner surface of the negative pressure generating chamber 103. The annular channel 112 is located between the conical outer side surface 303 and the inner surface of the negative pressure generating chamber 103, and each auxiliary injection hole 302 is formed on the conical outer side surface 303.

[0074] Exemplarily, as Figure 5 shown, the vertical distance between the conical outer side surface 303 of the nozzle 30 and the inner surface of the negative pressure generating chamber 103 is d1, where 0 < d1 ≤ 1.5D to further improve the entrainment effect.

[0075] Exemplarily, as Figure 5 shown, the vertical distance between the central axis of the main injection hole 301 and the inner surface of the mixing chamber 110 is d2, where 0 < d2 ≤ 0.5D to further improve the entrainment effect. Preferably, the vertical distance d2 between the central axis of the main injection hole 301 and the inner surface of the mixing chamber 110 is equal to 0.5D. In other words, the central axis of the main injection hole 301 coincides with the transverse central axis X.

[0076] Exemplarily, as Figure 5 shown, the vertical distance between the central axis of the auxiliary injection hole 302 and the inner surface of the mixing chamber 110 is d3, where 0 < d3 < 0.5D to further improve the entrainment effect.

[0077] In one alternative technical solution, such as Figures 2 to 4 As shown, the ejector also includes a nozzle mounting base 40, which extends into the first supply port 101, and the nozzle 30 is fixed to the end of the nozzle mounting base 40.

[0078] exist Figures 2 to 4 In the example, the nozzle mount 40 is disposed along the transverse central axis X, and the central axis of the nozzle mount 40 coincides with the transverse central axis X. One end of the nozzle mount 40 has an annular flange 401, which is located outside the first supply port 101 and abuts against one end face of the ejector housing 10. The other end of the nozzle mount 40 is fixedly connected to the nozzle 30 to hold the nozzle 30 in the internal flow channel of the ejector housing 10. A sealing ring 402 is provided between the outer surface of the nozzle mount 40 and the inner surface of the ejector housing 10 to prevent fluid leakage between them.

[0079] For example, the material of seal 402 can be a hydrogen-compatible material to provide a reliable seal in hydrogen environments and hydrogen-containing gas mixtures. Alternatively, the material of seal 402 can be ethylene propylene diene monomer (EPDM), polysiloxane rubber (VMQ), or fluororubber (FKM) to adapt to low-temperature and high-pressure environments.

[0080] In one alternative technical solution, such as Figures 1 to 4 As shown, the ejector housing 10 is also provided with one or more detection holes 113, through which temperature sensors or pressure sensors can be used to test the fluid inside the ejector housing 10. Each detection hole 113 extends from the outer side of the ejector housing 10 to its inner side and communicates with the negative pressure generating chamber 103, the mixing chamber 110, or the diffusion chamber 104.

[0081] exist Figures 1 to 4 In the example, the ejector housing 10 is provided with two detection holes 113, one of which is connected to the connection between the negative pressure generating chamber 103 and the mixing chamber 110, and the other detection hole 113 is connected to the diffusion chamber 104.

[0082] The above description is merely an embodiment of this specification and is not intended to limit this specification. Various modifications and variations can be made to this specification by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this specification should be included within the scope of the claims of this specification.

Claims

1. An ejector, characterized in that, Includes an ejector housing, the ejector housing defining: The first supply port is used to receive the supply of working fluid; The second supply port is used to receive the supply of the target fluid; A negative pressure generating chamber is used to generate negative pressure using the working fluid; as well as The diffusion chamber, connected to the negative pressure generating chamber, is used to allow the working fluid and the target fluid to flow in a flow direction parallel to the transverse central axis of the ejector housing. Wherein, the diameter of the negative pressure generating chamber decreases along the flow direction, the diameter of the diffusion chamber increases along the flow direction, the inner surface of the negative pressure generating chamber is formed by rotating a first generatrix around the transverse central axis, and the inner surface of the diffusion chamber is formed by rotating a second generatrix around the transverse central axis. At least one of the first generatrix and the second generatrix is ​​an arc protruding toward the transverse central axis.

2. The ejector according to claim 1, characterized in that, At least one of the first and second generatrices is configured to extend in a curved manner along a path that is at least a portion of the profile of the upper arc of the preset airfoil.

3. The ejector according to claim 2, characterized in that, The first generatrix is ​​configured to bulge toward the transverse central axis and extend in a curved manner along a path parallel to at least a portion of the contour of the upper arc of the preset airfoil to the transition position between the second supply port and the negative pressure generating chamber.

4. The ejector according to claim 2, characterized in that, The upper arc of the preset airfoil includes a first part of the profile from the leading edge of the preset airfoil to the position of maximum camber of the preset airfoil, and a second part of the profile from the position of maximum camber to the trailing edge of the preset airfoil. The first busbar is configured to extend in a curved manner along a path parallel to at least a portion of the first partial profile, and / or the second busbar is configured to extend in a curved manner along a path parallel to at least a portion of the second partial profile.

5. The ejector according to any one of claims 2 to 4, characterized in that, The angle between the chord of the preset airfoil and the transverse central axis is α, where -45°≤α≤+45°.

6. The ejector according to claim 2, characterized in that, The preset airfoil is a low Reynolds number airfoil.

7. The ejector according to any one of claims 1 to 6, characterized in that, The ejector housing further defines a mixing chamber, wherein the negative pressure generating chamber, the mixing chamber, and the diffusion chamber are connected in sequence, and the diameter of the mixing chamber is not greater than the minimum diameter of the negative pressure generating chamber and not greater than the minimum diameter of the diffusion chamber; The ejector also includes a nozzle, which is located at the first supply port along the transverse central axis and is used to inject the working fluid toward the negative pressure generating chamber.

8. The ejector according to claim 7, characterized in that, The diameter of the mixing chamber is D, and the vertical distance between the outer surface of the nozzle and the inner surface of the negative pressure generating chamber is d1, where 0 <d1≤1.5D。 9. The ejector according to claim 7, characterized in that, The nozzle has a main nozzle and a plurality of secondary nozzles spaced apart around the main nozzle.

10. The ejector according to claim 9, wherein the diameter of the mixing chamber is D, and the perpendicular distance between the central axis of the main injection hole and the inner surface of the mixing chamber is d2, where 0 < d2 ≤ 0.5D; and / or the diameter of the mixing chamber is D, and the perpendicular distance between the central axis of the auxiliary injection hole and the inner surface of the mixing chamber is d3, where 0 < d3 < 0.5D.

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