CN110685819A - Injector and injection method - Google Patents

Abstract

The present invention provides an injector and an injecting method. The injector includes at least one group of injecting devices, and the injecting device includes a flow channel inlet, a flow channel and a nozzle; the first port of the flow channel is connected to the flow channel. The inlet is connected, and the second port of the flow channel is connected with the nozzle; along the extending direction from the first port to the second port of the flow channel, the cross-sectional area of the flow channel gradually decreases; by gradually shrinking It increases the shear rate of the material, increases the shear area, and gradually thins the material, thereby reducing the flow resistance of the material and shortening the response time of the material receiving device.

Description

Injector and injection method

technical field

The invention relates to the technical field of spacecraft propulsion systems, in particular to an injector and an injection method.

Background technique

At present, most of the gel propellants used in the project are non-Newtonian fluids, which only show flow characteristics under a certain pressure. Compared with traditional liquid propellants, the viscosity of gel propellants increases and the flow resistance increases significantly; traditional extrusion The injector of the type rocket engine usually adopts a laminate design, and the gel propellant enters the combustion chamber through the liquid collection cavity and the distribution channel. This method is easy to cause the gel propellant to stay and re-condensate, forming a high viscosity and low flow rate area. This further increases the flow resistance of the gel propellant and prolongs the response time of the engine.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an injector and an injection method to reduce the flow resistance of the material and shorten the response time of the engine.

An injector provided by the present invention includes at least one group of injection devices; the injection device includes a flow channel inlet, a flow channel and a nozzle; the first port of the flow channel is connected to the flow channel inlet, so the The second port of the flow channel is connected with the nozzle; along the extending direction from the first port to the second port of the flow channel, the cross-sectional area of the flow channel gradually decreases; the inlet of the flow channel is connected to the outside The material supply system is connected to the material supply system for conveying the material provided by the material supply system to the flow channel; the flow channel is used for conveying the material to the nozzle. During the conveying process of the material, the The gradually decreasing cross-sectional area of the flow channel shear thins the material; the nozzle is used to deliver the material to an external material receiving device.

Further, the number of the flow channels is multiple, the number of the nozzles is multiple, and the number of the nozzles is the same as the number of the flow channels; a plurality of the nozzles are symmetrically distributed in the center; a plurality of the flow The channels are connected with the plurality of nozzles in one-to-one correspondence.

Further, the connection structure between the first ports of the plurality of flow channels is tapered.

Further, the flow channel is a conical tube structure.

Further, the flow path inlet is a frustoconical cavity structure; the first port of the flow path inlet is connected to the material supply system, and the second port of the flow path inlet is connected to the first port of the flow path. The ports are connected; along the extending direction from the first port to the second port of the flow path inlet, the cross-sectional area of the flow path inlet gradually decreases.

Further, the extending direction of the first port of the flow channel is the same as the extending direction of the second port of the flow channel inlet.

Further, the nozzle includes an equal straight section, a converging section and a circular pipe section that are connected in sequence; the first port of the equal straight section of the nozzle is connected with the second port of the flow channel; the equal straight section of the nozzle is connected The second port of the converging section is connected to the first port of the converging section, the second port of the converging section is connected to the first port of the circular pipe section, and the first port of the converging section is connected to the In the extending direction of the second port, the cross-sectional area of the converging section gradually decreases; the second port of the circular pipe section of the nozzle is connected with the material receiving device.

Further, the extending direction of the second port of the flow channel is the same as the extending direction of the equal straight section of the nozzle.

Further, the injector includes two groups of injection devices, and the flow path inlets in the first injection device and the flow path inlets in the second injection device are symmetrically distributed.

The present invention provides an injection method, which is applied to the injector described in any of the above; the method includes: connecting the flow path inlet with an external material supply system, and connecting the material supply system The supplied material is conveyed to the flow channel; the flow channel conveys the material to the nozzle, and during the conveying of the material, the material is exposed to the material by the gradually decreasing cross-sectional area of the flow channel. Shear thinning is performed; the nozzle conveys the material to an external material receiving device.

The injector and the injecting method provided by the present invention include at least one group of injecting devices, the injecting device comprising a flow channel inlet, a flow channel and a nozzle; the first port of the flow channel is connected to the flow channel inlet, and the The second port of the flow channel is connected with the nozzle; along the extending direction from the first port to the second port of the flow channel, the cross-sectional area of the flow channel gradually decreases; The shear rate of the material increases the shear area to gradually thin the material, thereby reducing the flow resistance of the material and shortening the response time of the material receiving device.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

1 is a schematic structural diagram of an injector provided by an embodiment of the present invention;

2 is a schematic structural diagram of an injector flow channel according to an embodiment of the present invention;

3 is a schematic diagram of the assembly of an injector inside an engine according to an embodiment of the present invention;

4 is a schematic structural diagram of a cross-sectional view of an internal flow channel of an injector according to an embodiment of the present invention;

5 is a schematic diagram of the distribution of nozzles inside an injector according to an embodiment of the present invention;

6 is a schematic structural diagram of a flow path inlet of an injector according to an embodiment of the present invention;

7 is a schematic structural diagram of an injector nozzle according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a cross-sectional view of a fuel and oxidant flow channel inside an injector according to an embodiment of the present invention.

Icons: 1-propellant supply system pipeline valve; 2-injector; 21-flow path inlet; 211-oxidant flow path inlet; 212-fuel flow path inlet; 22-flow path; 221-oxidant flow path; 222 - fuel runner; 23 - nozzle; 231 - oxidant nozzle; 232 - fuel nozzle; 3 - engine combustion chamber.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The gel propellant rocket engine has the advantages of high specific impulse of the liquid rocket engine, adjustable thrust, multiple starts, easy storage and transportation of the solid rocket engine, convenient use and maintenance, etc. Broad application prospects.

At present, the injector of the traditional extrusion rocket engine usually adopts a laminate design, and the propellant enters the combustion chamber through the liquid collecting cavity and the distribution flow channel. Recondensation forms a region of high viscosity and low flow rate, which further increases the flow resistance of the gel propellant and prolongs the response time of the engine.

Based on this, embodiments of the present invention provide an injector and an injection method, and the technology can be applied to material injection of a rocket engine or material injection of other propulsion systems.

Referring to the schematic structural diagram of an injector shown in FIG. 1 , the injector 2 includes at least one group of injection devices; the injection devices include a flow path inlet 21 , a flow channel 22 and a nozzle 23 .

In actual implementation, the number of injection devices set in the injector 2 can be one group or multiple groups, which can be set according to requirements. For example, if the materials to be injected are two or two If there are more than one type, and when the injector 2 cannot be mixed, a group of injection devices can be provided for each material.

The first port of the flow channel 22 is connected to the flow channel inlet 21, and the second port of the flow channel 22 is connected to the nozzle 23; along the extending direction from the first port to the second port of the flow channel 22, the flow channel 22 The cross-sectional area gradually decreases.

The above-mentioned flow channel 22 starts from the port position connected with the flow channel inlet 21 and ends at the port position connected with the corresponding nozzle 23, the entire flow channel 22 is a structure of gradually and evenly shrinking; The positions of the inlet 21 and the nozzle 23 are designed in the form of a curved flow channel, as shown in Figure 1. It should be noted that when designing the bending angle, it is usually necessary to ensure that the internal direction of the flow channel 22 changes smoothly and slowly to avoid 22 Material flow loss caused by pipe bends. In actual implementation, the inner diameter of the first port of the flow channel 22 can be determined according to the inner diameter of the port of the flow channel inlet 21 connected thereto. For example, if one flow channel inlet corresponds to only one flow channel 22, the flow channel 22 The inner diameter of the first port of the flow channel 22, that is, the inner diameter of the inlet of the flow channel 22 is designed to be the same value as the inner diameter of the port of the inlet of the flow channel connected to it; in actual implementation, the inner diameter of the second port of the flow channel 22, that is, the inner diameter of the outlet of the flow channel 22 , the length of the flow channel 22 and the shrinkage half angle and other parameters can be obtained by cold flow test or iterative optimization of flow numerical simulation calculation; the following two methods are briefly described.

Method 1, cold flow test, usually means that the user pre-predicts the initial design value of the parameters to be calculated. According to the initial design value, the test piece is processed and loaded into the supporting tooling. Through the test, the flow under the initial design value is tested. By predicting the initial design values of multiple sets of parameters to be calculated, multiple sets of corresponding flow resistance data and filling time data can be obtained.

Method 2, flow numerical simulation calculation, usually the user can input the pre-provided initial design values of the parameters to be calculated through the fluid simulation software, such as ANSYS Fluent simulation software, or by programming, based on the relevant physical characteristics of the material. Calculate a set of flow resistance data and filling time data under the initial design value, and adjust the input value of the parameter to be calculated for many times, such as adjusting the inner diameter of the second port of the flow channel 22, that is, the flow channel 22. By adjusting the inner diameter of the outlet or adjusting the length of the flow channel 22, multiple sets of flow resistance data and filling time data can be obtained; from the multiple sets of flow resistance data and filling time data obtained through the above experiments, the results that meet the preset standards are selected. Data, in general, there are mainly two judgment criteria, namely time and flow resistance; time is usually related to volume; if the inlet flow rate is known, the inlet pressure and outlet pressure can be basically determined, and the difference between the two data That is, the flow resistance, the smaller the flow resistance, the better; in actual implementation, it is usually necessary to take into account the two parameters of flow resistance and time; The result data with lower flow resistance data is selected from the result data, and the corresponding value of the parameter to be calculated can be used as the inner diameter of the second port of the flow channel 22, that is, the inner diameter of the outlet of the flow channel 22, the length of the flow channel 22 and the inner diameter of the second port of the flow channel 22. The value of parameters such as shrinkage half-width.

When the inner diameter of the first port of the flow channel 22 is obtained, that is, the inner diameter of the inlet of the flow channel 22 and the inner diameter of the second port of the flow channel 22, that is, the inner diameter of the outlet of the flow channel 22 and the length of the flow channel 22, the following formula (1 ) to calculate the constriction half angle of the flow channel 22, for example, refer to the structural schematic diagram of a flow channel of an injector shown in FIG. ₂ ; the inlet inner diameter of the flow channel 22 is represented by D ₂ means that the length of the flow channel 22 is represented by l, and the constricted half angle of the flow channel 22 is represented by α ₂ , then the constricted half angle α ₂ of the flow channel 22 can be calculated by the following formula:

The internal volume V2 of the flow channel ₂₂ can be calculated by the following formula (2):

The internal volume of a single flow channel 22 is related to the filling time and transport efficiency of the material. Generally, the smaller the internal volume of a single flow channel 22, the shorter the filling time and the higher the transport efficiency.

The above-mentioned flow path inlet 21 is connected to an external material supply system, and is used for conveying the material provided by the material supply system to the above-mentioned flow passage 22; the flow passage 22 is used for conveying the material to the nozzle 23, during the material conveying process , the material is shear-thinned through the gradually decreasing cross-sectional area of the flow channel 22; the nozzle 23 is used to transport the material to an external material receiving device.

In actual implementation, the above-mentioned material supply system may be a propellant supply system, and the above-mentioned material receiving device may be an engine combustion chamber; referring to the schematic diagram of the assembly of an injector inside the engine shown in FIG. 3 , the injector 2 can be It is arranged between the propellant supply system pipeline valve 1 and the engine combustion chamber 3. The structure is divided into upper, middle and lower layers. The upper layer is the propellant supply system pipeline valve 1, the middle layer is the injector 2, and the lower layer is the engine combustion chamber. 3. The flow path inlet 21 of the injector 2 is connected to the pipeline valve 1 of the propellant supply system; the nozzle 23 of the injector 2 is connected to the engine combustion chamber 3; the flow path inlet 21 of the injector 2 is connected to the propellant supply system. The supplied material is delivered to the engine combustion chamber 3 through the flow channel 22 and the nozzle 23 of the injector 2 .

An embodiment of the present invention provides an injector, comprising at least one group of injection devices, the injection device comprising a flow channel inlet, a flow channel and a nozzle; a first port of the flow channel is connected to the flow channel inlet, and a first port of the flow channel is connected to the flow channel inlet, and the first port of the flow channel The second port is connected to the nozzle; along the extending direction from the first port to the second port of the flow channel, the cross-sectional area of the flow channel gradually decreases; through the gradually shrinking flow channel, the shear rate of the material is increased and the shear The cutting area gradually thins the material, thereby reducing the flow resistance of the material and shortening the response time of the material receiving device.

Further, the number of flow channels 22 is multiple, the number of nozzles 23 is multiple, and the number of nozzles 23 is the same as the number of flow channels 22; the multiple nozzles 23 are symmetrically distributed in the center; multiple flow channels 22 and multiple nozzles 23 One-to-one connection.

Referring to the schematic structural diagram of a cross-sectional view of the internal flow channel of the injector shown in FIG. 4, in actual implementation, the flow channel inlet 21 and the flow channel 22 are generally connected by a smooth transition of curved surfaces. When designing the flow channel 22, it can be The larger rounded corners are used to achieve smooth transition and compact structure; the original main channel can be divided into several channels 22 at the connection, similar to the bifurcation structure of plant roots and animal blood vessels, so as to avoid the existence of the channels 22 Material retention and recoagulation caused by blind cavity or folded angle. For example, when the material is a gel propellant, the gel propellant exhibits flow characteristics only under a certain pressure. If there is only one flow channel 22, the problem of blind cavity or bending angle will easily occur, which will lead to the retention and recoagulation of the gel propellant. The number of the above-mentioned flow channels 22 can be set according to the requirements. The number of flow channels 22 is different, and the structural parameters of the flow channels 22 are usually different. Specifically, it can be obtained by iterative optimization calculation through cold flow test or flow numerical simulation calculation, and the calculation method can refer to the above. The embodiment will not be repeated here; since the nozzles 23 and the flow channels 22 usually need to be connected one-to-one, the nozzles 23 can also be set to multiple, and the number is the same as the number of the flow channels 22, and the multiple nozzles 23 are usually The center is symmetrically distributed to make the weight distribution of the injector more uniform. For example, referring to a schematic diagram of the distribution of nozzles inside an injector shown in FIG. 5, FIG. 5 includes four oxidant nozzles 231 and four fuel nozzles 232, Among them, the four oxidant nozzles 231 are distributed symmetrically around the center, and the four fuel nozzles 232 are also distributed symmetrically around the center.

Further, as shown in FIG. 4 , the connection structure between the first ports of the plurality of flow channels 22 is tapered; take one flow channel inlet 21 connecting four flow channels 22 as an example for illustration, and the four flow channels are connected at the connection. 22 The middle of the four tangent circles is originally a plane. This structure is easy to cause the material flow to be blocked, and material backflow or stagnation may occur. When material flows in, each flow channel 22 is equivalent to a closed structure, which can dilute the material and ensure that the material continues to flow.

Further, the flow channel 22 is a conical tube structure; in actual implementation, the above-mentioned flow channel 22 can be designed as a conical circular tube structure, that is, inside the injector 2, the flow channel 22 is usually a curved tube that gradually shrinks structure, the cross-sectional area of the flow channel 22 is gradually reduced.

Further, the above-mentioned flow path inlet 21 is a frustoconical cavity structure; the first port of the flow path inlet 21 is connected with the material supply system, and the second port of the flow path inlet 21 is connected with the first port of the flow channel 22; The cross-sectional area of the flow path inlet 21 gradually decreases along the extending direction from the first port to the second port of the flow path inlet 21 .

The inner diameter of the first port of the flow path inlet 21, that is, the inner diameter of the inlet of the flow path inlet 21, can be determined according to the inner diameter of the outlet of the material supply system connected to it. Generally, the inner diameter of the first port of the flow path inlet 21 can be determined by It is designed to be the same value as the inner diameter of the outlet of the material supply system connected to it. In actual implementation, the inner diameter of the second port of the flow path inlet 21, that is, the outlet inner diameter of the flow path inlet 21, the height of the flow path inlet 21 and the half angle of convergence The other parameters can be obtained by iterative optimization through cold flow test or flow numerical simulation calculation, and the calculation method can refer to the previous embodiment, which is not repeated here; When the inner diameter of the inlet, the inner diameter of the second port of the flow channel inlet 21, that is, the inner diameter of the outlet of the flow channel inlet 21 and the height of the flow channel inlet 21, the convergence half angle of the flow channel inlet 21 can be calculated by the following formula (3), for example , referring to a schematic diagram of the structure of a flow path inlet of an injector shown in FIG. 6; the inner diameter of the inlet of the flow path inlet 21 is represented by D1, the inner diameter of the outlet of the flow path inlet 21 is represented by d1, and the height of the flow path inlet 21 is represented by h , the convergence half angle of the flow path inlet 21 is represented by α1, then the convergence half angle α1 of the flow path inlet 21 can be calculated by the following formula:

The internal volume V ₁ of a single flow path inlet 21 can be calculated by the following formula (4):

The internal volume of a single flow channel inlet 21 is related to the filling time and transportation efficiency of the material. Generally, the smaller the internal volume of the flow channel inlet 21, the shorter the filling time for the material in the current cavity, and the higher the transportation efficiency.

Further, as shown in FIG. 1 , the extension direction of the first port of the flow channel 22 is the same as the extension direction of the second port of the flow channel inlet 21; that is, when designing the flow channel 22, in order to reduce the material flow resistance, usually The first port of the flow channel 22 is designed to extend along the direction of the second port of the flow channel inlet 21 , that is, the angle of the first port of the flow channel 22 is consistent with the direction of the flow channel inlet 21 .

Further, the nozzle 23 includes an equal straight section, a converging section and a circular pipe section that are connected in sequence; the first port of the equal straight section of the nozzle 23 is connected with the second port of the flow channel 22; the equal straight section of the nozzle 23 is The second port is connected to the first port of the converging section, and the second port of the converging section is connected to the first port of the circular pipe section, along the extending direction from the first port of the converging section to the second port of the converging section , the cross-sectional area of the converging section gradually decreases; the second port of the circular pipe section of the nozzle 23 is connected to the material receiving device; the structure of the nozzle 23 can be an integral molding structure, and the second port of the equal straight section of the nozzle 23 The inner diameter of the converging section and the inner diameter of the first port of the converging section are usually set to the same value; the inner diameter of the second port of the converging section and the inner diameter of the first port of the circular pipe section are usually set to the same value; the above-mentioned equal straight sections and The circular tube sections are all hollow cylindrical structures, and the circular tube sections are usually thin and thin circular tubes; taking the material as the gel propellant as an example, the gel propellant can be further sheared through the converging section, thereby further reducing the propellant's Apparent viscosity.

In actual implementation, the inner diameter of the thin circular pipe section can be determined by known parameters such as the flow rate of the material, pressure drop, mixing ratio, and Luper number; Parameters such as the length and the length of the thin circular pipe section can be obtained through cold flow test or iterative optimization of flow numerical simulation calculation. The specific calculation method can refer to the previous embodiment, which will not be repeated here; When the inner diameter of the segment, the length of the equal straight segment, the length of the convergent segment, and the length of the thin circular pipe segment, the convergence half angle of the convergent segment can be calculated by the following formula (5). Schematic diagram of the structure of the nozzle; the inner diameter of the thin circular tube section and the inner diameter of the second port of the converging section are denoted by d3, the inner diameter of the equal straight section and the inner diameter of the first port of the converging section are denoted by D3, and the length of the equal straight section is denoted by Ld , the length of the convergence segment is represented by L, the length of the thin circular tube segment is represented by L0, and the convergence half angle of the convergent segment is represented by α3, then the convergence half angle α3 of the convergent segment can be calculated by the following formula:

The internal volume _V3 of a single nozzle 23 can be calculated by the following formula (6):

The internal volume of a single nozzle 23 is related to the material filling time and transportation efficiency. Generally, the smaller the inner volume of the nozzle 23, the shorter the material filling time and the higher the transportation efficiency.

Further, as shown in FIG. 1 , the extending direction of the second port of the flow channel 22 is the same as the extending direction of the equal straight section of the nozzle 23; that is, when designing the flow channel 22, in order to reduce the material flow resistance, the flow is usually The second port of the channel 22 is designed to extend along the direction of the equal straight section of the nozzle 23 , that is, the angle of the second port of the flow channel 22 is consistent with the direction of the nozzle 23 .

Further, the injector 2 includes two groups of injection devices, and the flow channel inlets 21 in the first injection device and the flow channel inlets 21 in the second injection device are symmetrically distributed.

Taking the material as the gel propellant, the material supply system as the propellant supply system, and the material receiving device as the engine combustion chamber as an example, refer to a schematic structural diagram of a cross-sectional view of the fuel and oxidant flow channels inside the injector shown in FIG. 8 . ; In actual implementation, two materials, oxidant and fuel, are usually required to be transported from the propellant supply system to the engine combustion chamber 3 at the same time, so the injector 2 needs to include two sets of injection devices, and in order to avoid the existence of a blind cavity due to the flow channel 22 Or the material retention and recondensation caused by the bent angle usually cause each flow path inlet 21 to correspond to the flow paths 22 of multiple branches, that is, the flow path inlet 21 includes an oxidant flow path inlet 211 and a fuel flow path inlet 212. The channel 22 includes a plurality of oxidant flow channels 221 and a plurality of fuel flow channels 222, and the nozzle 23 includes a plurality of oxidant nozzles 231 and a plurality of fuel nozzles 232; wherein, the number of the plurality of oxidant flow channels 221 and the plurality of oxidant nozzles 231 is the same, And they are connected one by one; the number of the plurality of fuel flow channels 222 and the plurality of fuel nozzles 232 is the same, and they are connected one by one; in general, the design of the engine is as symmetrical as possible, so that the weight can be adjusted better, therefore, an oxidant flow The position of the channel inlet 211 and the position of one fuel channel inlet 212 are usually designed to be axially symmetrically distributed, and the structural dimensions of the oxidant channel inlet 211 and the fuel channel inlet 212 are not necessarily the same. structure size.

The plurality of oxidant nozzles 231 and the plurality of fuel nozzles 232 are distributed symmetrically around the center. Usually, the oxidant nozzles 231 and the fuel nozzles 232 are designed to be the same in number, but the specific structural dimensions or angles of the oxidant nozzles 231 and the fuel nozzles 232 may be different. , the respective structural dimensions can be calculated with reference to the previous embodiment. As shown in FIG. 5 , taking the number of the oxidant nozzles 231 and the fuel nozzles 232 as four as an example, the four oxidant nozzles 231 are symmetrically distributed at the center, and the four fuel nozzles are 232 is also symmetrically distributed in the center; the 4 oxidant nozzles 231 and the 4 fuel nozzles 232 are respectively in the form of discs, and the 4 oxidant nozzles 231 and the 4 fuel nozzles 232 are in the form of concentric circles; it should be noted that, it is also possible to The injector is made by 3D printing.

The rapid development of current additive manufacturing technology has made it possible to process injectors containing complex flow channel designs, using the shear sensitivity of gel propellants to reduce their apparent viscosity through mechanical shear; specifically, using gel The propellant shear thinning characteristic, by designing the injector with the inner flow channel gradually shrinking, the rheological properties of the gel propellant are improved, the flow resistance of the gel propellant is reduced, the engine response time is reduced, and the propellant atomization effect is enhanced, Improve engine combustion efficiency and specific impulse performance.

As another implementation, on the premise of ensuring the flow rate and pressure drop of the injector, the shear rate of the gel propellant can be increased and the propellant can be significantly reduced by adopting a constricted internal flow channel and appropriately reducing the volume. Reduce the apparent viscosity of the agent and reduce the filling time.

In another injector provided by the embodiment of the present invention, the entire injector structure of the flow channel inlet, the flow channel and the nozzle gradually shrinks, and through the continuous flow shearing action, the shearing area is increased to realize material transportation and injection. The shear thinning in the process reduces the flow resistance of the material and shortens the response time of the material receiving device.

An embodiment of the present invention provides an injection method, which is applied to the above-mentioned injector; the method includes: connecting a flow path inlet to an external material supply system, and conveying the material provided by the material supply system to the flow path; The flow channel conveys the material to the nozzle. During the material conveying process, the material is shear-thinned by the gradually decreasing cross-sectional area of the flow channel; the nozzle conveys the material to an external material receiving device.

In actual implementation, the flow path inlet receives the material provided by the material supply system connected to it, and the number of flow path inlets can be set according to the type of material; in order to avoid material retention and recondensation caused by the existence of blind cavities or bent angles in a single flow path , it can be designed in a way that one flow channel inlet corresponds to multiple flow channels, that is, the flow channel inlet transports the received material to multiple flow channels connected to it, and because the cross-sectional area of the flow channel gradually decreases, based on Due to the physical properties of the material itself, the material will be gradually sheared and thinned in the process of being transported from the runner to the nozzle, and finally the thinned material will be transported to the material receiving device connected to it through the nozzle.

In the above injection method, the flow path inlet transports the material provided by the material supply system to the flow channel; the flow channel transports the material to the nozzle, and the nozzle transports the material to an external material receiving device; in this method, Through the gradually shrinking flow channel, the shear rate of the material is increased, the shear area is increased, and the material is gradually thinned, thereby reducing the flow resistance of the material and shortening the response time of the material receiving device.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: The technical solutions described in the foregoing embodiments can still be modified, or some or all of the technical features thereof can be equivalently replaced; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the embodiments of the present invention. scope.

Claims (10)

1. An injector, comprising at least one set of injection means; the injection device comprises a flow path inlet, a flow path and a nozzle;

the first port of the flow passage is connected with the flow passage inlet, and the second port of the flow passage is connected with the nozzle; the cross-sectional area of the flow passage is gradually reduced along the extension direction of the first port to the second port of the flow passage;

the flow path inlet is connected with an external material supply system and used for conveying the material provided by the material supply system to the flow path; the flow channel is used for conveying the material to the nozzle, and the material is subjected to shear thinning through the gradually reduced cross section area of the flow channel in the conveying process of the material; the nozzle is used for conveying the material to an external material receiving device.

2. The injector of claim 1, wherein said flow channel is plural in number and said nozzle is plural in number, said nozzles being the same in number as said flow channel;

the nozzles are distributed in a central symmetry way; the plurality of flow passages are connected with the plurality of nozzles in a one-to-one correspondence manner.

3. The injector of claim 2, wherein the connection between the first ports of the plurality of flow channels is tapered.

4. The injector of claim 1, wherein said flow channel is a tapered tube structure.

5. The injector of claim 1, wherein said flow path inlet is a frusto-conical cavity configuration;

a first port of the flow path inlet is connected with the material supply system, and a second port of the flow path inlet is connected with the first port of the flow path; the cross-sectional area of the flow path inlet decreases gradually along the direction of extension of the first port to the second port of the flow path inlet.

6. The injector of claim 5, wherein the first port of the flow channel extends in the same direction as the second port of the flow path inlet.

7. The injector of claim 1, wherein said nozzle comprises a straight section, a converging section and a circular tube section connected in series;

the first port of the equal straight section of the nozzle is connected with the second port of the flow passage; the second port of the equal straight section of the nozzle is connected with the first port of the convergent section, the second port of the convergent section is connected with the first port of the circular pipe section, and the cross-sectional area of the convergent section is gradually reduced along the extension direction from the first port of the convergent section to the second port of the convergent section; and the second port of the circular pipe section of the nozzle is connected with the material receiving device.

8. The injector of claim 7, wherein the second port of the flow channel extends in the same direction as the straight section of the nozzle.

9. The injector of claim 1, wherein the injector comprises two sets of injector devices, the flow path inlets in a first injector device being symmetrically distributed with the flow path inlets in a second injector device.

10. An injection method, characterized in that it is applied to an injector according to any one of claims 1 to 9; the method comprises the following steps:

the flow path inlet is connected with an external material supply system and used for conveying materials provided by the material supply system to the flow path; the material is conveyed to the nozzle by the flow channel, and the material is subjected to shear thinning through the gradually reduced cross section area of the flow channel in the conveying process of the material; the nozzle conveys the material to an external material receiving device.

Images