Split type pipeline throat joint

Abstract

The split type pipeline throat joint comprises a throat pipe core, a throat outer joint and a ball joint, a throat channel is formed in the throat pipe core, the throat pipe core is detachably arranged in the throat outer joint, and the outer side wall of the first end of the throat pipe core is attached to the inner side wall of the first end of the throat outer joint in a sealed mode; an airflow channel is arranged in the ball joint, the second end of the ball joint is inserted into the end, close to the first end of the throat outer joint, of the throat pipe core, and the outer side wall of the ball joint is attached to the inner side wall of the throat pipe core in a sealed mode. The throat pipe core is arranged to play a role in throttling, so that the pressure of working gas which does not enter the throat channel is remarkably improved, and the throat pipe core plays a role in accelerating, the pressure is increased, the flow rate is increased, and the influence of chamber pressure fluctuation of the gas generator on the flow of the working gas in the gas inlet pipeline can be greatly reduced; and the flow of the working gas entering the fuel gas generator is more stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of gas generator ground experiment, in particular to a split type pipeline throat joint. BACKGROUND

[0002] Gas generators are widely used in various experimental researches, especially in the fields of aerospace, energy, etc., for simulating combustion processes under specific conditions. In the experimental process related to gas generators, oxygen, hydrogen, high-pressure air and other working gases need to be quantitatively supplied to the gas generator. The working gases are mixed with fuel in the gas generator and ignited to produce combustion gases with certain pressure and temperature to complete the relevant experimental research. After the working gases are burned in the gas generator, the pressure in the chamber of the gas generator fluctuates within a certain range, which affects the flow of the working gases in the gas generator inlet pipeline, making the actual flow of the working gases entering the gas generator very unstable, and further causing a large deviation between the actual flow and the target flow of the working gases entering the gas generator, which affects the experimental results. CONTENT OF THE UTILITY MODEL

[0003] Therefore, the present application provides a split type pipeline throat joint to solve the technical problem that the flow of working gases in the gas generator inlet pipeline is unstable in the prior art, causing a large deviation between the actual flow and the target flow of the working gases entering the gas generator.

[0004] In order to achieve the above-mentioned purpose, the present application provides the following technical solution: a split type pipeline throat joint, comprising a throat outer joint, a gas passage is arranged in the throat outer joint, a throat pipe core, a throat passage is arranged in the throat pipe core, the diameter of the throat passage gradually decreases from both ends to the middle of the throat pipe core, the throat pipe core is detachably arranged in the gas passage of the throat outer joint, the outer side wall of the first end of the throat pipe core is in sealing contact with the inner side wall of the first end of the throat outer joint, a ball joint, a gas flow passage is arranged in the ball joint, the second end of the ball joint is inserted into the first end of the throat pipe core, and the outer side wall of the second end of the ball joint is in sealing contact with the inner side wall of the first end of the throat pipe core, the throat passage of the throat pipe core, the gas passage of the throat outer joint and the gas flow passage of the ball joint are coaxially arranged.

[0005] Preferably, the pipeline throat joint further comprises a confinement cap, one end of the confinement cap is sleeved on the ball joint, and the other end of the confinement cap is detachably connected with the throat outer joint.

[0006] Preferably, the second end of the ball joint is provided with a first taper, an outer sidewall of the first taper is a first taper surface, the first end of the throat pipe core extends outward to form a second taper, an inner sidewall of the second taper is a second taper surface, an outer sidewall of the second taper is a third taper surface, an inner sidewall of the first end of the throat outer joint is provided with a fourth taper surface, the first taper is inserted into the second taper, and the first taper surface and the second taper surface are in sealing abutment, and the third taper surface and the fourth taper surface are in sealing abutment.

[0007] Further preferably, the throat passage of the throat pipe core comprises a contraction section, a throat section and an expansion section, the throat section is arranged between the contraction section and the expansion section, the contraction section and the expansion section are taper surfaces, and the second taper surface is on an extension surface of the contraction section.

[0008] Preferably, the trapping cap comprises a trapping portion and a clamping portion integrally connected to one end of the trapping portion, an inner side of the trapping portion is provided with an internal thread, an outer sidewall of the first end of the throat outer joint is provided with an external thread matched with the internal thread, a distal end of the clamping portion away from the trapping portion is provided with a clamping ring extending in the axial direction, an outer sidewall of the ball joint is provided with a first protruding ring, the trapping cap is sleeved on the ball joint, and the clamping ring and the first protruding ring are in abutment on a side away from the throat outer joint.

[0009] Preferably, the throat outer joint comprises a second protruding ring, the second protruding ring is arranged on an outer sidewall of the throat outer joint, and the second protruding ring is arranged on an end close to the external thread.

[0010] Preferably, the throat outer joint is made of stainless steel.

[0011] Compared with the prior art, the application has at least the following beneficial effects:

[0012] The split type pipeline throat joint comprises a throat pipe core, a throat outer joint and a ball joint, the inside of the throat pipe core is provided with a throat passage, the throat pipe core is detachably arranged in the gas passage of the throat outer joint, the outside wall of one end of the throat pipe core is sealingly arranged with the inside wall of the first end of the throat outer joint, the second end of the ball joint is inserted into one end of the throat pipe core close to the first end of the throat outer joint, and the outside wall of the ball joint is sealingly attached to the inside wall of the throat pipe core. The working gas needs to pass through the throat passage of the throat pipe core to enter the gas generator. In this way, by arranging the throat pipe core, on the one hand, it plays a throttling role, so as to ensure that the working gas flow through the throat passage reaches the target flow, and the pressure of the working gas (i.e. the pressure of the working gas supply end) not entering the throat passage is significantly increased; on the other hand, it plays an accelerating role, and the flow rate of the working gas passing through the throat passage is significantly increased. The increase of the pressure of the working gas supply end and the flow rate of the working gas passing through the throat passage can greatly reduce the influence of the pressure fluctuation of the chamber cavity of the gas generator on the working gas flow in the gas inlet pipeline, so that the flow of the working gas entering the gas generator is more stable, thereby reducing the deviation between the actual flow and the target flow of the working gas entering the gas generator. In addition, the throat pipe core and the throat outer joint are detachably arranged, the other end of the ball joint is detachably inserted into one end of the throat outer joint away from the second target pipeline and one end of the throat pipe core. In this way, the throat pipe core is replaced with a throat pipe core with a throat passage with a matching diameter according to the working gas flow requirement, and the throat pipe core is convenient to replace. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more directly illustrate the prior art and the present application, the following exemplary drawings are given. It should be understood that the specific shapes, structures shown in the drawings should not be regarded as limiting conditions in the implementation of the present application; for example, based on the technical concept disclosed in the present application and the exemplary drawings, those skilled in the art can easily make routine adjustments or further optimization on the increase / decrease / attribute division of certain units (components), specific shape, positional relationship, connection mode, size ratio relationship, etc.

[0014] Figure 1 An axial sectional view of a split type pipeline throat joint provided for an embodiment of the present application;

[0015] Figure 2 A split structure schematic view of a split type pipeline throat joint provided for an embodiment of the present application;

[0016] Figure 3 An axial sectional view of a throat outer joint of a split type pipeline throat joint provided for an embodiment of the present application;

[0017] Figure 4 An axial sectional view of a throat pipe core of a split type pipeline throat joint provided for an embodiment of the present application;

[0018] Figure 5 An axial sectional view of a split type pipeline throat joint's ball joint provided by the embodiment of the present application;

[0019] Figure 6 An axial sectional view of a split type pipeline throat joint's ball joint provided by the embodiment of the present application;

[0020] Explanation of reference signs:

[0021] 1, throat outer joint; 101, second protruding ring; 102, fourth conical surface; 2, throat core; 201, second conical part; 202, contraction section; 203, throat section; 204, expansion section; 3, confinement cap; 301, confinement part; 302, clamping part; 4, ball joint; 401, first conical part; 402, first protruding ring. DETAILED DESCRIPTION

[0022] The present application will be further described in detail below with reference to the accompanying drawings.

[0023] The utility model discloses a split type pipeline throat joint, which is applied to ground experiment of gas generator, and is arranged between the gas inlet pipeline of the gas generator and the gas generator. The pipeline throat joint comprises a throat core 2, a throat outer joint 1 and a ball joint 4. The throat core 2, the throat outer joint 1 and the ball joint 4 are all in cylindrical shape. The two ends of the throat outer joint 1 are a first end and a second end respectively, and the two ends of the ball joint 4 are also a first end and a second end respectively.

[0024] The throat core 2 is detachably arranged in the gas passage of the throat outer joint 1. The outer side wall of one end of the throat core 2 is in sealing contact with the inner side wall of the first end of the throat outer joint 1. The second end of the throat outer joint 1 is sealingly connected with the gas inlet of the gas generator. Preferably, the second end of the throat outer joint 1 is welded with the gas inlet of the gas generator. The outer side wall of the throat outer joint 1 is provided with a second protruding ring 101, which is arranged at one end close to the external thread. When the throat outer joint 1 is inserted into the gas inlet of the gas generator, the second protruding ring 101 not only plays a limiting role, but also can be welded without affecting the threaded connection structure of the first end of the throat outer joint 1.

[0025] The throat pipe core 2 is internally provided with a throat passage, the diameter of the throat passage gradually decreases from the two ends to the middle of the throat pipe core 2. The minimum diameter (throat section) of the throat passage is determined according to the required working gas flow. Preferably, the throat passage comprises a contraction section 202, a throat section 203 and an expansion section 204, the throat section 203 is arranged between the contraction section 202 and the expansion section 204, the contraction section 202 and the expansion section 204 are conical surfaces, the throat section 203 is the minimum diameter section of the throat passage, and the second conical surface extends on the surface of the contraction section 202. The shape of the throat passage is simple to manufacture.

[0026] The ball joint 4 is internally provided with a gas flow passage, the second end of the ball joint 4 is inserted into one end of the throat pipe core 2 close to the first end of the throat outer joint 1, the outer side wall of the ball joint 4 is in sealing contact with the inner side wall of the throat pipe core 2, and the first end of the ball joint 4 is in detachable connection with the gas inlet pipe of the gas generator. The gas inlet pipe is preferably a metal bellows.

[0027] The throat passage of the throat pipe core 2, the gas passage of the throat outer joint 1 and the gas passage of the ball joint 4 are coaxially arranged, thereby reducing the resistance to the delivery of working gas.

[0028] In the embodiment, by arranging the throat pipe core 2, on the one hand, it plays a throttling role. In order to ensure that the working gas flow through the throat passage reaches the target flow, the pressure of the working gas that does not enter the throat passage (i.e. the pressure of the working gas supply end) is significantly increased. On the other hand, it plays an accelerating role. The flow rate of the working gas through the throat passage is significantly increased. The increase of the pressure of the working gas supply end and the increase of the flow rate of the working gas through the throat passage can greatly reduce the influence of the pressure fluctuation of the chamber cavity of the gas generator on the working gas flow in the gas inlet pipe, so that the working gas flow into the gas generator is more stable, thereby reducing the deviation between the actual flow and the target flow of the working gas into the gas generator.

[0029] For example, the working gas flow required to enter the gas generator is the target flow. When the throat pipe core 2 is not arranged, because the diameter of the gas inlet pipe is large, the pressure of the working gas supply end is set to be very small, so that the working gas flow into the gas generator can reach the target flow. After the throat pipe core 2 is arranged, because the diameter of the throat section 203 is very small, in order to make the working gas flow into the gas generator reach the target flow, the pressure of the working gas supply end needs to be greatly increased, which is much higher than when the throat pipe core 2 is not arranged. When the chamber cavity pressure of the gas generator fluctuates within a certain range, it will not have too much influence on the working gas flow in the gas inlet pipe of the gas generator, so that the working gas flow into the gas generator is relatively stable, thereby reducing the deviation between the actual flow and the target flow of the working gas into the gas generator.

[0030] In a preferred state, when the pressure of the working gas supply end and the minimum diameter of the throat passage (the diameter of the throat section 203) reach a certain condition, the flow rate of the working gas passing through the throat section 203 can reach the speed of sound state and be stable in the speed of sound state. Specifically, if the pressure of the working gas supply end is set in a high pressure range, much larger than the chamber pressure of the gas generator, the total temperature of the working gas is the constant ambient temperature, and the diameter of the throat section 203 is determined according to the working gas flow rate, the flow rate of the working gas in the throat section 203 can reach the speed of sound state. The working gas flow rate in the throat section 203 can be in the speed of sound state within the change range of the chamber pressure of the gas generator, so that the working gas flow rate is not affected by the change of the chamber pressure of the gas generator, thereby keeping the working gas flow rate stable.

[0031] In addition, the pipeline throat joint adopts a split structure, and if the flow demand of the working gas is different, only the throat pipe core 2 with different sizes of throat section needs to be replaced.

[0032] In a preferred embodiment, the second end of the ball joint 4 is provided with a first taper portion 401, the outer side wall of the first taper portion 401 is a first taper surface, one end of the throat pipe core 2 extends outward to form a second taper portion 201, the inner side wall of the second taper portion 201 is a second taper surface, the outer side wall of the second taper portion 201 is a third taper surface, the inner side wall of the first end of the throat outer joint 1 is provided with a fourth taper surface 102, the first taper portion 401 is inserted into the second taper portion 201, and the first taper surface and the second taper surface are in sealing abutment, and the third taper surface and the fourth taper surface 102 are in sealing abutment. In this way, the connecting end of the ball joint 4, the throat outer joint 1 and the throat pipe core 2 are sealingly connected, the throat passage and the air passage are sealingly connected, and the working gas completely passes through the throat passage.

[0033] In a preferred embodiment, the pipeline throat joint further comprises a confinement cap 3, the confinement cap 3 is sleeved on the ball joint 4 and abuts against the ball joint 4, and the other end of the confinement cap 3 is detachably connected with the throat outer joint 1. Specifically, the confinement cap 3 comprises a confinement portion 301 and a clamping portion 302 integrally connected at one end of the confinement portion 301, the inner side of the confinement portion 301 is provided with an internal thread, the outer side wall of the first end of the throat outer joint 1 is provided with an external thread matched with the internal thread, the end of the clamping portion 302 away from the confinement portion 301 is provided with a clamping ring extending in the axial direction, the outer side wall of the ball joint 4 is provided with a first protruding ring 402, the minimum diameter of the clamping ring is smaller than the outer diameter of the first protruding ring 402, when the confinement cap 3 is sleeved on the ball joint 4, the clamping ring abuts against the side of the first protruding ring 402 away from the throat outer joint 1, and as the confinement cap 3 is tightened with the throat outer joint 1, the clamping ring will continue to press the ball joint 4 to the side of the throat outer joint 1, so that the first taper surface and the second taper surface, and the third taper surface and the fourth taper surface 102 are further tightly attached, further ensuring the sealing property of the gas passage.

[0034] In a preferred embodiment, the throat connector 1, the enclosure cap 3, and the ball joint 4 are preferably made of stainless steel, and the throat core 2 is made of brass. After the brass is extruded, the sealing effect of the gas passage is better.

[0035] Any technical features in the above embodiments can be combined (as long as the combination of technical features does not exist contradiction), in order to make the description simple, all possible combinations of technical features in the above embodiments are not described; these embodiments which are not explicitly written should also be considered as the scope of the present disclosure.

Claims

1. A split-type pipe throat connector, characterized in that, The pipeline throat connector includes: The external tracheal connector (1) has an internal gas passage; The throat tube core (2) has a throat channel inside. The diameter of the throat channel gradually decreases from both ends of the throat tube core (2) towards the middle. The throat tube core (2) is detachably installed in the gas channel of the throat external connector (1). The outer side wall of the first end of the throat tube core (2) is sealed and attached to the inner side wall of the first end of the throat external connector (1). The ball joint (4) has an airflow channel inside. The second end of the ball joint (4) is inserted into the first end of the throat tube core (2), and the outer side wall of the second end of the ball joint (4) is sealed and attached to the inner side wall of the first end of the throat tube core (2). The throat passage of the throat tube core (2), the gas passage of the throat external connector (1), and the gas passage of the ball joint (4) are coaxially arranged.

2. The split-type pipe throat connector according to claim 1, characterized in that, The pipeline throat connector also includes a locking cap (3), one end of which is fitted onto the ball joint (4), and the other end of which is detachably connected to the throat external connector (1).

3. A split-type pipe throat connector according to claim 1, characterized in that, The second end of the ball joint (4) is provided with a first cone (401), the outer side wall of the first cone (401) is a first cone surface, the first end of the throat tube core (2) extends outward to form a second cone (201), the inner side wall of the second cone (201) is a second cone surface, the outer side wall of the second cone (201) is a third cone surface, the inner side wall of the first end of the throat external connector (1) is provided with a fourth cone surface (102), the first cone (401) is inserted into the second cone (201), and the first cone surface and the second cone surface are sealed and abutted, and the third cone surface and the fourth cone surface (102) are sealed and abutted.

4. A split-type pipe throat connector according to claim 3, characterized in that, The throat passage of the throat tube (2) includes a constriction section (202), a throat section (203), and an expansion section (204). The throat section (203) is disposed between the constriction section (202) and the expansion section (204). The constriction section (202) and the expansion section (204) are conical surfaces, and the second conical surface is on the extension surface of the constriction section (202).

5. A split-type pipe throat connector according to claim 2, characterized in that, The locking cap (3) includes a locking part (301) and a locking part (302) integrally connected to one end of the locking part (301). The inner side of the locking part (301) is provided with an internal thread. The outer side wall of the first end of the throat external connector (1) is provided with an external thread adapted to the internal thread. The end of the locking part (302) away from the locking part (301) is provided with a retaining ring extending axially. The outer side wall of the ball joint (4) is provided with a first convex ring (402). The locking cap (3) is sleeved on the ball joint (4). The retaining ring abuts against the side of the first convex ring (402) away from the throat external connector (1).

6. A split-type pipe throat connector according to claim 1, characterized in that, The throat external connector (1) includes a second protruding ring (101), which is disposed on the outer side wall of the throat external connector (1) and is disposed at one end near the external thread.

7. A split-type pipe throat connector according to claim 1, characterized in that, The external throat connector (1), the restraint cap (3), and the ball head connector (4) are made of stainless steel.

8. A split-type pipe throat connector according to claim 1, characterized in that, The throat tube core (2) is made of brass.

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