A jet pump structure having a ring nozzle twice mixing structure

Abstract

This invention discloses a jet pump structure with a two-stage mixing mechanism using an annular nozzle, comprising a connecting flange, a housing, a guide tube, a nozzle, a guide cone, and an ejector. The guide cone is placed inside the nozzle and installed between the connecting flange and the nozzle. The nozzle and the guide cone together form an annular flow channel, and the guide tube is installed outside the nozzle. The guide tube is a hollow cylindrical structure with a ring of flow holes on its outer side. This jet pump structure improves upon existing tapered nozzle technology by employing an annular nozzle design. With the outlet throat area remaining unchanged, it allows for two-stage mixing of the working steam and the pumped gas, thereby enhancing the pumping capacity of the tapered nozzle jet pump.

Description

Technical Field

[0001] This invention relates to a jet pump, and more particularly to a jet pump structure having a two-stage mixing structure with an annular nozzle. Background Technology

[0002] The core of a jet pump is to use a high-speed jet of high-pressure working steam to eject and transport the fluid being pumped.

[0003] Vacuum is injected into the housing through the flange and nozzle, and then the working fluid drawn in from the pumped inlet is drawn out through the ejector and exits the jet pump.

[0004] The technical structure of traditional jet pumps is as follows: Figure 1 As shown, a traditional jet pump consists of a connecting flange, a housing, a nozzle, and an ejector. The nozzle is threaded to the bottom of the connecting flange, the connecting flange is bolted to the housing, and the ejector is installed at the bottom of the housing.

[0005] Traditional jet pumps have a small ejector ratio and poor suction capacity. While increasing the nozzle throat area can improve suction capacity, it also increases the flow rate at the working steam inlet, necessitating improvements.

[0006] Among existing related patent technologies, such as the jet pump disclosed in patent document (CN102705272B), a novel structure is constructed that enables two (or three) mixing of primary and secondary fluids by coaxially connecting annular ejectors in series at the front end of a central ejector. However, this annular ejector structure is complex and bulky, making it unsuitable for improving existing tapered nozzle technology to increase suction capacity without increasing the throat area and working steam flow rate.

[0007] Therefore, there is an urgent need to design a jet pump structure with a two-stage mixing mechanism using an annular nozzle. This involves improving upon existing tapered nozzle technology by adopting an annular nozzle design. By keeping the outlet throat area constant, the working steam and the pumped gas are mixed twice, thus enhancing the pumping capacity of the tapered nozzle jet pump. Summary of the Invention

[0008] The present invention proposes a jet pump structure with a two-stage mixing structure using an annular nozzle, which can increase the suction capacity without increasing the throat area and the working steam flow rate.

[0009] To achieve the above objectives, the technical solution of the present invention is: a jet pump structure with a two-stage mixing structure of an annular nozzle, including a connecting flange, a housing, a guide tube, a nozzle, a guide cone, and an ejector. The guide cone is placed inside the nozzle and installed between the connecting flange and the nozzle. The nozzle and the guide cone together form an annular flow channel, and the guide tube is installed on the outside of the nozzle. The guide tube is a hollow cylinder structure with a ring of flow holes on its outer side.

[0010] Furthermore, the total area of ​​the nozzle throat is consistent with the existing nozzle outlet area.

[0011] Furthermore, the nozzle is threaded onto the bottom of the connecting flange.

[0012] Furthermore, the guide tube is connected to the nozzle via threads.

[0013] Furthermore, the flow area inside the guide tube gradually decreases along the flow direction.

[0014] Furthermore, the connecting flange is bolted to the housing.

[0015] Furthermore, the ejector is installed at the bottom of the housing.

[0016] Furthermore, the ejector adopts a Laval nozzle structure.

[0017] Furthermore, during use, the working steam is ejected at high speed through the annular channel on the nozzle and enters the annular area between the nozzle and the guide tube. The steam flow then enters the interior of the guide tube through the circular hole and is drawn out of the guide tube by the working steam. The flow area inside the guide tube gradually decreases along the steam flow direction, and the steam flow velocity continues to increase. After the steam flow exits from the guide tube, the working steam and the entrained steam flow still maintain a high relative velocity, which can continue to entrain the steam flow outside the guide tube, forming a stronger flow momentum and continuing to flow downstream to the ejector.

[0018] Furthermore, after the steam enters the ejector, it first accelerates in the converging section, then decelerates and pressurizes in the expanding section, and finally enters the cooler for energy recovery or further processing.

[0019] The beneficial effects of this invention are:

[0020] Compared to traditional jet pumps, the jet pump with the annular nozzle and double mixing structure of this invention has a higher suction capacity. The annular jet ejected from the annular nozzle can more effectively entrain and mix the pumped fluid, significantly improving the ejection efficiency. After the vapor flows out of the guide tube, a secondary mixing effect is achieved, further enhancing the overall suction performance of the jet pump and increasing the ejection coefficient. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a traditional jet pump. Figure 2 This is a schematic diagram of the jet pump with a two-stage mixing structure of an annular nozzle according to the present invention; Figure 3 This is a schematic diagram of the flow guide tube. Figure 4 This is a schematic diagram of the nozzle structure; Figure 5 This is a schematic diagram of the guide cone structure; Figure 6 This is a schematic diagram of the combined structure of the guide tube and nozzle; in, Figures 3-6 (a) is the front view, and (b) is the 3D view. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] like Figures 2 to 6 As shown in the figure, an embodiment of the present invention provides a jet pump structure with a two-stage mixing structure of an annular nozzle, including a connecting flange 1, a housing 2, a guide tube 3, a nozzle 4, a guide cone 5, an ejector 6, etc.

[0024] The guide cone 5 is placed inside the nozzle 4 and installed between the connecting flange 1 and the nozzle 4; the guide tube 3 is threaded onto the outside of the nozzle 4; the nozzle 4 is threaded onto the bottom of the connecting flange 1; the connecting flange 1 is bolted onto the housing 2; and the ejector 6 is installed at the lower part of the housing 2. Its fundamental difference from a traditional jet pump lies in its guide cone, nozzle, and guide tube structure.

[0025] The new nozzle 4 and the guide cone 5 together form an annular flow channel, and the total throat area of ​​the nozzle 4 is consistent with the outlet area of ​​the traditional nozzle.

[0026] The guide tube 3 is generally a hollow cylindrical structure with a ring of flow holes on its upper side, and its left side can be connected to the nozzle 4 by threads.

[0027] When using, Figure 6 (a) illustrates the steam flow direction as it passes through the core component. Working steam is ejected at high speed through the annular channel on the nozzle and enters the annular region between the nozzle and the guide tube. The steam then enters the guide tube through the circular holes and is drawn out by the working steam. The flow area within the guide tube gradually decreases along the flow direction, and the steam velocity continuously increases. Due to the small velocity difference between the nozzle outlet and the guide tube, flow losses are minimal, resulting in high energy utilization efficiency.

[0028] After the steam flows out of the guide tube, the working steam and the entrained steam still maintain a high relative velocity, which allows it to continue to entrain steam outside the guide tube, forming stronger flow momentum and continuing to flow downstream to the ejector. The ejector adopts a Laval nozzle structure, where the steam first accelerates in the converging section, then decelerates and pressurizes in the diverging section, and finally enters the cooler for energy recovery or further processing.

[0029] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the invention. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the invention. Therefore, all technical solutions obtained through equivalent substitution or transformation fall within the protection scope of the present invention.

Claims

1. A jet pump structure with a two-stage mixing structure using an annular nozzle, comprising a connecting flange, a housing, a guide tube, a nozzle, a guide cone, and an ejector, characterized in that: The guide cone is placed inside the nozzle and installed between the nozzle and the connecting flange; the nozzle and the guide cone together form an annular flow channel, and the guide tube is installed on the outside of the nozzle; the guide tube is a hollow cylinder structure with a ring of flow holes on its outer side.

2. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The total throat area of ​​the nozzles is consistent with the existing nozzle outlet area.

3. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The nozzle is threaded onto the bottom of the connecting flange.

4. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The guide tube is connected to the nozzle via threads.

5. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The flow area inside the guide tube gradually decreases along the flow direction.

6. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The connecting flange is bolted to the housing.

7. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The ejector is installed at the bottom of the housing.

8. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: The ejector uses a Laval nozzle structure.

9. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 1, characterized in that: During use, the working steam is ejected at high speed through the annular channel on the nozzle and enters the annular area between the nozzle and the guide tube. The steam flow then enters the interior of the guide tube through the circular hole on the guide tube and is drawn out of the guide tube by the working steam. The flow area inside the guide tube gradually decreases along the steam flow direction, and the steam flow velocity continues to increase. After the steam flows out of the guide tube, the working steam and the entrained steam flow still maintain a high relative velocity, which can continue to entrain the steam flow outside the guide tube, forming a stronger flow momentum and continuing to flow downstream to the ejector.

10. The jet pump structure with a two-stage mixing structure of an annular nozzle according to claim 9, characterized in that: The steam flow enters the ejector, where it first accelerates in the converging section, then decelerates and increases pressure in the expanding section, and finally enters the cooler for energy recovery or further processing.

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