Jet structure for ethylene glycol vacuum jet pump unit

Abstract

The utility model relates to the technical field of ethylene glycol vacuum injection pump units, in particular to an injection structure for an ethylene glycol vacuum injection pump unit, which comprises an input part, a mixing mechanism, an output part, a heat insulation sleeve arranged on the outer side of the output part and an injection pipe mounted on the input part, wherein the input part comprises an input pipe and an exhaust pipe connected to the bottom of the input pipe; the mixing mechanism comprises a conical sleeve and a central ring, and a plurality of spinning disks which are arranged in an annular array are connected between the outer wall of the central ring and the inner wall of the conical sleeve; a three-dimensional spiral flow field is constructed through the swirl pieces, mixing time is shortened, turbulence intensity is improved, fluid mixing uniformity is improved, mixed fluid forms limited flow acceleration through the throat pipe after being primarily compressed in the mixing pipe, shock wave effect is generated due to the fact that the flow section is enlarged when the mixed fluid enters the expansion pipe, kinetic energy is efficiently converted into pressure energy, and the flow speed of the mixed fluid is increased. And pressure gradient lifting is achieved.

Description

Technical Field

[0001] This utility model relates to the technical field of ethylene glycol vacuum jet pump units, specifically to the jetting structure used in ethylene glycol vacuum jet pump units. Background Technology

[0002] Ethylene glycol vacuum jet pump units are devices that use ethylene glycol vapor as the working medium to generate a vacuum environment through the jetting principle. They are widely used in polyester production, chemical, and pharmaceutical industries. Based on the vapor jetting principle, the ethylene glycol vacuum jet pump unit achieves high vacuum through a series of multi-stage ejectors. The jetting structure is the core structure. Typically, the nozzle structure is equipped with a heating jacket, which preheats the nozzle using steam or heat transfer oil to prevent liquefaction of ethylene glycol vapor in the nozzle chamber and improve vacuum stability.

[0003] In an existing patent publication number CN217783881U, an ethylene glycol jetting vacuum unit is disclosed, wherein the first-stage ejector includes a diffuser, the diffuser having an exhaust end and an inlet end, the inlet end being connected to a nozzle chamber, and a nozzle assembly being inserted into the nozzle chamber; the nozzle assembly includes a heating jacket inserted into the nozzle chamber, the inner end of the heating jacket extending axially to be close to the inlet end, a heating chamber being provided in the heating jacket, and a flange being coaxially provided on the outer end of the heating jacket, the flange having two inlet channels and an outlet channel respectively communicating with the heating chamber, and an axially extending guide pipe being provided in the heating chamber, one end of the guide pipe being connected to one of the inlet channels.

[0004] While stable mixing and injection can be achieved during heating, the injection effect still needs improvement. Mixing is only achieved through a simple connection between the nozzle chamber and the diffuser, lacking active control over the fluid flow pattern. The steam and the pumped gas are in an axial laminar flow state in the mixing section, with limited contact area and insufficient energy exchange, resulting in poor uniformity of fluid velocity and pressure after mixing, thus affecting subsequent compression efficiency. To address these issues, an injection structure for ethylene glycol vacuum jet pump units is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a jetting structure for an ethylene glycol vacuum jet pump unit to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] The jetting structure for an ethylene glycol vacuum jet pump unit includes an inlet section, a mixing mechanism, and an outlet section;

[0008] It also includes an insulation sleeve disposed on the outside of the output section and a nozzle mounted on the input section; wherein, the input section includes an input pipe and an air extraction pipe connected to the bottom of the input pipe; the mixing mechanism includes a conical sleeve and a central ring, and a plurality of swirl vanes arranged in a ring array are connected between the outer wall of the central ring and the inner wall of the conical sleeve.

[0009] The output section includes a mixing tube and an expansion tube. The mixing tube is connected to the expansion tube through a throat tube. The inner wall of the mixing tube near the input tube fits with the outer wall of the conical sleeve.

[0010] The nozzle includes a mounting plate installed on one side of the input pipe and a Laval nozzle fixed inside the mounting plate, with a heating sleeve connected to the outer wall of the Laval nozzle.

[0011] In one alternative: the end of the input tube is connected to the end of the mixing tube.

[0012] In one alternative: a limiting ring is connected to one side of the conical sleeve, and an annular groove that mates with the limiting ring is provided on the inner wall of the mixing tube.

[0013] In one alternative: the swirl vane is tilted, and the angle between the swirl vane and the central ring axis is 20-35°.

[0014] In one alternative: the insulation sleeve includes two sets of sleeves that wrap around the outer walls of the mixing pipe, the throat pipe and the expansion pipe, with connecting strips connected to both sides of the opening of the sleeve, and the connecting strips having a number of positioning holes.

[0015] In one alternative: the heating sleeve extends to the end outside the mounting plate and is connected to a lead tube.

[0016] In one alternative: the exhaust end of the extraction pipe corresponds to the bottom of the outer wall of the heating jacket.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] In this invention, a three-dimensional spiral flow field is constructed by swirl vanes, which reduces mixing time, increases turbulence intensity, and improves the uniformity of fluid mixing. After the mixed fluid is initially compressed in the mixing tube, it is accelerated by forming a confined flow through the throat tube. When it enters the expansion tube, the shock wave effect is generated due to the expansion of the flow cross section, which efficiently converts kinetic energy into pressure energy and realizes the pressure gradient increase.

[0019] The modular design of the hybrid mechanism and the detachable insulation sleeve in this invention facilitates the replacement of local components. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model.

[0021] Figure 2 This is a schematic diagram of the output section in this utility model.

[0022] Figure 3 This is a schematic diagram of the disassembled structure of this utility model.

[0023] Figure 4 This is a schematic diagram of the mixing mechanism in this utility model.

[0024] Figure 5 This is a schematic diagram of the nozzle structure in this utility model.

[0025] Figure 6 This is a cross-sectional view of the input section and nozzle in this utility model.

[0026] In the diagram: 1. Input section; 2. Mixing mechanism; 3. Output section; 4. Insulation sleeve; 5. Nozzle; 11. Input pipe; 12. Extraction pipe; 21. Limiting ring; 22. Conical sleeve; 23. Central ring; 24. Swirl vane; 31. Mixing pipe; 32. Throat; 33. Expanding pipe; 34. Annular groove; 41. Sleeve body; 42. Connecting strip; 43. Positioning hole; 51. Mounting plate; 52. Laval nozzle; 53. Heating sleeve; 54. Lead wire pipe. Detailed Implementation

[0027] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-6 In this embodiment, the injection structure for the ethylene glycol vacuum jet pump unit includes an input section 1, a mixing mechanism 2, and an output section 3.

[0030] It also includes an insulation sleeve 4 disposed outside the output section 3 and a nozzle 5 mounted on the input section 1; wherein, the input section 1 includes an input pipe 11 and an exhaust pipe 12 connected to the bottom of the input pipe 11; the mixing mechanism 2 includes a conical sleeve 22 and a central ring 23, and a plurality of swirl vanes 24 arranged in a ring array are connected between the outer wall of the central ring 23 and the inner wall of the conical sleeve 22.

[0031] The output section 3 includes a mixing tube 31 and an expansion tube 33. The mixing tube 31 is connected to the expansion tube 33 through a throat tube 32. The inner wall of the mixing tube 31 near the input tube 11 is fitted with the outer wall of the conical sleeve 22.

[0032] The nozzle 5 includes a mounting plate 51 installed on one side of the input pipe 11 and a Laval nozzle 52 fixed in the mounting plate 51. The outer wall of the Laval nozzle 52 is connected to a heating sleeve 53. The Laval nozzle 52 has a nozzle structure that first contracts and then expands.

[0033] Using the above scheme, high-pressure ethylene glycol vapor enters the nozzle 5, passes through the Laval nozzle 52, and forms a high-speed steam jet. A low-pressure suction effect is generated in the outlet area of ​​the nozzle 5. The extraction pipe 12 is connected to the vacuum area to be evacuated. Under the action of low pressure at the outlet of the nozzle 5, the gas to be evacuated flows into the input pipe 11 through the extraction pipe 12 and is initially mixed with the high-speed steam flow.

[0034] The swirling vanes 24, which are evenly distributed between the central ring 23 and the conical sleeve 22 of the mixing mechanism 2, force the mixed airflow to move in a spiral motion along the axis of the central ring 23, forming a swirling flow field;

[0035] The mixed fluid enters the mixing pipe 31 for initial compression, then enters the expansion pipe 33 after passing through the throat pipe 32. The flow rate decreases and the pressure rises, completing the conversion of kinetic energy into pressure energy. After being mixed by the injection structure, it is then injected.

[0036] Please see Figure 1 The end of the input pipe 11 is connected to the end of the mixing pipe 31. The mixed fluid output from the input pipe 11 first enters the mixing pipe 31, and then enters the expansion pipe 33 after passing through the throat pipe 32.

[0037] Please see Figure 3 and Figure 4 The conical sleeve 22 is connected to a limiting ring 21 on one side, and the inner wall of the mixing tube 31 is provided with an annular groove 34 that cooperates with the limiting ring 21. The limiting ring 21 of the conical sleeve 22 is embedded in the annular groove 34 of the mixing tube 31 to ensure the coaxiality of the mixing mechanism 2 and the output part 3, and at the same time improve the sealing performance of the docking. When installing and docking, a corresponding sealing gasket can be set at the docking point.

[0038] Please see Figure 4The swirl vane 24 is inclined, and the angle between the swirl vane 24 and the axis of the central ring 23 is 20-35°; this allows the gas to form a spiral airflow.

[0039] Please see Figure 1 The insulation sleeve 4 includes two sets of sleeves 41 wrapped around the outer walls of the mixing pipe 31, the throat pipe 32 and the expansion pipe 33. Both sides of the opening of the sleeve 41 are connected to connecting strips 42, and the connecting strips 42 are provided with several positioning holes 43. Specifically, bolts that cooperate with the positioning holes 43 can be used to connect the upper and lower connecting strips 42. The sleeve 41 can be an existing electric heating or heat-conducting medium flow, and its selection is based on the requirements in actual application.

[0040] Please see Figure 5 The heating sleeve 53 extends to the outside of the mounting plate 51 and is connected to the lead pipe 54. Specifically, the heating sleeve 53 extends to the outside of the mounting plate 51 and is connected to the heating medium through the lead pipe 54 to achieve constant temperature heating of the Laval nozzle 52 throughout the process and prevent steam condensation in the inlet section.

[0041] Please see Figure 6 The exhaust end of the exhaust pipe 12 corresponds to the bottom of the outer wall of the heating jacket 53.

[0042] The working principle of this invention is as follows: High-pressure ethylene glycol vapor forms a jet through the Laval nozzle 52. The contraction-expansion structure accelerates the vapor flow, generating a significant low-pressure effect in the outlet region. Gas is efficiently drawn in through the extraction pipe 12, achieving initial mixing of the two fluids. The mixed airflow enters the annular channel formed by the conical sleeve 22 and the central ring 23, forming a spiral flow under the guidance of the 20-35° inclined swirl vane 24. After the mixed fluid completes the initial compression in the mixing pipe 31, it forms a restricted flow and accelerates through the throat pipe 32. When it enters the expansion pipe 33, the shock wave effect is generated due to the expansion of the flow cross section, which efficiently converts kinetic energy into pressure energy, thereby achieving pressure gradient enhancement.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A jetting structure for an ethylene glycol vacuum jet pump unit, comprising an input section (1), a mixing mechanism (2), and an output section (3), characterized in that: It also includes a heat insulation sleeve (4) set on the outside of the output section (3) and a nozzle (5) installed on the input section (1); The input section (1) includes an input pipe (11) and an exhaust pipe (12) connected to the bottom of the input pipe (11); the mixing mechanism (2) includes a conical sleeve (22) and a central ring (23), and a plurality of swirl vanes (24) arranged in a ring array are connected between the outer wall of the central ring (23) and the inner wall of the conical sleeve (22). The output section (3) includes a mixing tube (31) and an expansion tube (33). The mixing tube (31) is connected to the expansion tube (33) through a throat tube (32). The inner wall of the mixing tube (31) near the input tube (11) is fitted with the outer wall of the conical sleeve (22). The nozzle (5) includes a mounting plate (51) installed on one side of the input pipe (11) and a Laval nozzle (52) fixed in the mounting plate (51), with a heating sleeve (53) connected to the outer wall of the Laval nozzle (52).

2. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 1, characterized in that: The end of the input tube (11) is connected to the end of the mixing tube (31).

3. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 2, characterized in that: The conical sleeve (22) is connected to a limiting ring (21) on one side, and the inner wall of the mixing tube (31) is provided with an annular groove (34) that cooperates with the limiting ring (21).

4. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 3, characterized in that: The swirl vane (24) is inclined, and the angle between the swirl vane (24) and the axis of the central ring (23) is 20-35°.

5. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 1, characterized in that: The insulation sleeve (4) includes two sets of sleeves (41) wrapped around the outer walls of the mixing tube (31), the throat tube (32) and the expansion tube (33). Both sides of the opening of the sleeve (41) are connected with connecting strips (42), and the connecting strips (42) are provided with a number of positioning holes (43).

6. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 1, characterized in that: The heating sleeve (53) extends to the end outside the mounting plate (51) and is connected to the lead tube (54).

7. The injection structure for an ethylene glycol vacuum jet pump unit according to claim 1, characterized in that: The exhaust end of the exhaust pipe (12) corresponds to the bottom of the outer wall of the heating jacket (53).

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