Ejector

Abstract

The utility model relates to the field of ejectors, in particular to an ejector, according to the technical scheme, the ejector comprises a mixing body, a valve needle arranged in the mixing body, a control piece arranged at one end of the mixing body and used for controlling the valve needle and a valve sleeve arranged in the mixing body and arranged outside the valve needle, and the mixing body comprises a receiving chamber, a mixing chamber and a diffusion chamber; the valve needle is located in the receiving chamber, and a plurality of riflings are evenly formed in the inner wall of the end, facing the mixing chamber, of the valve sleeve in the circumferential direction. The ejector has the effects that the flow deflection phenomenon caused by eccentricity of the valve needle is reduced, and the ejection performance of the ejector is improved.

Description

Technical Field

[0001] The present application relates to the field of ejectors, and in particular to an ejector. Background Art

[0002] At present, the ejector structure is used in thermal management systems and hydrogen energy systems. The flow speed of the high-pressure fluid pressure inside the existing ejector is very fast after throttling and depressurization. If the valve needle is slightly eccentric in the valve port, the circumferential distribution of the high-speed flow channel inside the high-pressure injection port will be uneven, which will cause a large flow eccentricity trend outside the high-pressure injection port. The overall performance is that the high-speed fluid in the injection port section outside the high-pressure injection port is close to the inner wall on one side, resulting in large flow losses, and the ejection ratio and efficiency of the ejector are greatly reduced. In particular, during the ejector adjustment process, the turbulent fluctuations caused by the non-centering of the valve needle inside the high-pressure injection port are very obvious, and the performance stability of the ejector is poor. At the same time, due to the certain flow separation generated by the high-speed eccentric jet of the high-pressure nozzle, a relatively large turbulent vortex will be formed in the expansion section, which will affect the vibration and noise of the ejector.

[0003] Therefore, in the prior art, there is a phenomenon that the flow of the ejector in the high-pressure injection port and the injection port section below it is eccentric and has high- and low-speed partitioning. The low-pressure inlet fluid being drained aggravates the eccentricity and high- and low-speed partitioning of this flow section, causing large flow losses inside the ejector and low ejection efficiency, accompanied by vibration and noise. Utility Model Content

[0004] In order to reduce the flow deviation phenomenon caused by valve needle eccentricity and improve the ejection performance of the ejector, the present application provides an ejector.

[0005] The present application provides an ejector, which adopts the following technical solution:

[0006] An ejector comprises a mixing body, a valve needle arranged in the mixing body, a control member arranged at one end of the mixing body and used to control the valve needle, and a valve sleeve arranged in the mixing body and outside the valve needle, the mixing body comprises a receiving chamber, a mixing chamber and a diffusion chamber, the valve needle is located in the receiving chamber, and the inner wall of the end of the valve sleeve facing the mixing chamber is uniformly provided with a plurality of riflings along the circumferential direction.

[0007] By adopting the above technical solution, the rifling plays a role in adjusting the fluid distribution, promoting the circumferential uniformity of the fluid, increasing the flow velocity at the valve port, effectively avoiding the eccentric flow of high-speed fluid, alleviating the time of flow separation, and improving the injection efficiency.

[0008] Preferably, the rifling has a twist angle ranging from 5° to 15°.

[0009] Preferably, the opening at one end of the valve sleeve away from the control member is an injection port.

[0010] Preferably, the depth of the rifling is within 30% of the aperture radius of the injection port.

[0011] Preferably, when the valve needle moves toward the mixing chamber to a position closest to the injection port, a specified gap is formed between the valve needle and the valve sleeve.

[0012] Preferably, the gap between the valve needle and the valve sleeve is 3%-30% of the radius of the injection port.

[0013] Preferably, when the valve sleeve is cut along the center axis of the valve needle, the inner side wall line of the section of the end of the valve sleeve where the rifling is formed is parallel to or intersects with the center axis of the valve needle.

[0014] Preferably, when the valve sleeve is cut along the center axis of the valve needle, the angle between the inner wall line of the section of the end of the valve sleeve where the rifling is opened and the center axis is in the range of 0°-10°.

[0015] Preferably, the axial length range of the rifling is not less than 2 mm.

[0016] In summary, the rifling effectively promotes the circumferential uniformity of the fluid, increases the flow velocity at the valve port, and reduces the vibration and noise caused by unstable flow in the ejector. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of an ejector of the present application;

[0018] Figure 2 This is a cross-sectional view of an ejector of the present application. Figure 1 ;

[0019] Figure 3 This is a cross-sectional view of an ejector of the present application. Figure 2 ;

[0020] Figure 4 yes Figure 3 A's big picture;

[0021] Figure 5 is a cross-sectional view of a valve sleeve in an ejector of the present application;

[0022] Figure 6 yes Figure 4 Enlarged view of middle B;

[0023] Figure 7 It is a structural schematic diagram of the rifling in an ejector of the present application.

[0024] Explanation of the reference numerals in the accompanying drawings: 1. Mixing body; 11. Receiving chamber; 12. Mixing chamber; 13. Diffuser chamber; 2. Valve needle; 3. Control member; 4. Valve sleeve; 5. Rifling; 6. High-pressure inlet; 7. Low-pressure inlet; 8. Ejector outlet; 9. High-pressure flow channel; 10. Low-pressure flow channel; 14. Injection port. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1-Figure 7 This application is described in further detail.

[0026] The present application embodiment discloses an ejector. Figure 1 and Figure 2 , including a mixing body 1, a valve needle 2 installed in the mixing body 1 and a control member 3 installed at one end of the mixing body 1, and a valve sleeve 4 arranged outside the valve needle 2 is installed in the mixing body 1. The mixing body 1 includes a receiving chamber 11, a mixing chamber 12 and a diffusion chamber 13. The end of the valve needle 2 facing the mixing chamber 12 is located in the receiving chamber 11, and the control member 3 is used to drive the valve needle 2 to move toward the mixing chamber 12. The control member 3 of the present application is an ejection control electromagnetic head, and the valve sleeve 4 is a metal forming setting in the embodiment of the present application. The inner wall of the end of the valve sleeve 4 facing the mixing chamber 12 is evenly provided with a plurality of riflings 5 ​​along the circumferential direction. The rifling 5 can promote the uniformity of the circumferential flow of the fluid, increase the flow velocity of the valve port, and effectively alleviate the separation phenomenon of the fluid movement in the ejector injection port 14, reduce the flow resistance, improve the ejection efficiency, and reduce the vibration and noise caused by the unstable flow.

[0027] Reference Figure 2 and Figure 3 , a high-pressure inlet 6 is provided on the side wall of the mixing body 1, a hole connected to the high-pressure inlet 6 is provided on the valve sleeve 4, and a high-pressure flow channel 9 for high-pressure fluid to circulate is formed between the valve sleeve 4 and the valve needle 2. A low-pressure inlet 7 is provided on the side wall of the mixing body 1, and a low-pressure flow channel 10 is formed between the outer wall of the valve sleeve 4 and the inner wall of the receiving chamber 11, and the low-pressure inlet 7 is connected to the low-pressure flow channel 10. The side wall of the mixing body 1 of the present application where the low-pressure inlet 7 is installed is opposite to the side wall of the mixing body 1 where the high-pressure inlet 6 is installed, and an ejector outlet 8 connected to the diffusion chamber 13 is provided at one end of the mixing body 1 away from the control member 3. The high-pressure fluid enters the valve sleeve 4 from the high-pressure inlet 6, enters the receiving chamber 11 through the high-pressure flow channel 9, and is guided by the rifling 5 to improve the uniformity of the circumferential flow of the fluid, reduce the flow deviation phenomenon caused by the eccentricity of the valve needle 2, and effectively improve the ejection performance of the ejector.

[0028] Reference Figure 3 and Figure 4 When the control member 3 controls the valve needle 2 to move toward the mixing chamber 12 to the position where the valve needle 2 is closest to the injection port 14, the high-pressure flow channel 9 is closed, and there is a gap between the valve needle 2 and the valve sleeve 4. The gap range is 3%-30% of the radius of the injection port 14, preferably 3%-10% of the radius of the injection port 14, and more preferably 3%-5% of the radius of the injection port 14.

[0029] Reference Figure 4 and Figure 5When the valve sleeve 4 is cut along the center axis a of the valve needle 2 , the inner side wall line b of the section of the end of the valve sleeve 4 where the rifling 5 is opened is parallel to or intersects with the center axis of the valve needle 2 .

[0030] Reference Figure 5 and Figure 6 The winding angle of the rifling 5 is in the range of 5°-15°, and the winding angle is 10° in the embodiment of the present application. The opening of the end of the valve sleeve 4 away from the control member 3 is the injection port 14, and the depth range of the rifling 5 in the radial direction based on the surface of the valve sleeve 4 is within 30% of the orifice radius of the injection port 14.

[0031] Reference Figure 6 and Figure 7 In the present application, a plurality of riflings 5 ​​are evenly provided along the end of the valve sleeve 4, and the width of a single rifling 5 is 10%-30% of the circumference of the inner wall of the valve sleeve 4. In the embodiment of the present application, five riflings 5 ​​are provided. The axial length of the rifling 5 is not less than 2 mm.

[0032] The implementation principle of an ejector in an embodiment of the present application is as follows: by adding multiple groups of rifling grooves 5 on the inner wall of the injection port 14 of the valve sleeve 4, the multiple groups of rifling grooves 5 can promote the circumferential uniformity of the fluid, increase the flow rate of the valve port, and effectively alleviate the fluid movement separation phenomenon of the ejector injection port 14, effectively reduce the flow resistance, improve the ejection efficiency, and reduce the vibration and noise caused by flow instability.

[0033] Embodiment 2:

[0034] The difference between the embodiment of the present application and the embodiment 1 is that, Figure 4 When the valve sleeve 4 is cut along the center axis a of the valve needle 2, the angle between the inner side wall line b of the section of the end of the valve sleeve 4 where the rifling 5 is opened and the center axis ranges from 0° to 10°.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An ejector, comprising a mixing body (1), a valve needle (2) arranged in the mixing body (1), a control member (3) arranged at one end of the mixing body (1) and used to control the valve needle (2), and a valve sleeve (4) arranged in the mixing body (1) and arranged outside the valve needle (2), the mixing body (1) comprising a receiving chamber (11), a mixing chamber (12) and a diffusion chamber (13), the valve needle (2) being located in the receiving chamber (11), characterized in that: The inner wall of the end portion of the valve sleeve (4) facing the mixing chamber (12) is evenly provided with a plurality of rifling grooves (5) along the circumferential direction.

2. The ejector according to claim 1, characterized in that: The winding angle of the rifling (5) is in the range of 5°-15°.

3. The ejector according to claim 1, characterized in that: The opening at one end of the valve sleeve (4) away from the control member (3) is an injection port (14).

4. An ejector according to claim 3, characterized in that: The depth of the rifling (5) is within 30% of the aperture radius of the injection port (14).

5. The ejector according to claim 3, characterized in that: When the valve needle (2) moves toward the mixing chamber (12) to a position closest to the injection port (14), a predetermined gap exists between the valve needle (2) and the valve sleeve (4).

6. An ejector according to claim 5, characterized in that: The gap between the valve needle (2) and the valve sleeve (4) is 3%-30% of the radius of the injection port (14).

7. The ejector according to claim 1, characterized in that: When the valve sleeve (4) is cut along the center axis of the valve needle (2), the inner side wall line of the section of the end of the valve sleeve (4) where the rifling (5) is opened is parallel to or intersects with the center axis of the valve needle (2).

8. The ejector according to claim 1, characterized in that: When the valve sleeve (4) is cut along the center axis of the valve needle (2), the angle between the inner wall line of the section of the end of the valve sleeve (4) where the rifling (5) is opened and the center axis is in the range of 0°-10°.

9. The ejector according to claim 1, characterized in that: The axial length range of the rifling (5) is not less than 2 mm.

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