Cold air mixing chamber of electric arc heater

Abstract

The invention relates to a cold air mixing chamber of an electric arc heater. The cold air mixing chamber comprises a tubular inner shell, a water sealing ring, a gas sealing ring and a connecting flange. A plurality of annular grooves are distributed in the periphery of the tubular inner shell in the axial direction and alternately serve as cooling channels and air inlet channels, each cooling channel is correspondingly provided with a water sealing ring to form a cooling water channel, and a water inlet and a water outlet are formed in each water sealing ring in the radial direction. Each air inlet channel is correspondingly provided with an air sealing ring to form an annular air inlet channel, air inlets are formed in the air sealing rings in the radial direction, air inlet holes penetrating through the wall body of the tubular inner shell are formed in the bottoms of the air inlet channels, and connecting flanges are arranged at the two ends of the tubular inner shell respectively. The mixing chamber is compact in structure, can reduce the area of the inner wall surface as much as possible, avoid excessive heat loss and improve the adjustment range of the gas enthalpy value while meeting the gas inflow and cooling requirements, and can meet the gas enthalpy value range requirement of a full-track heat protection test. In addition, the overall weight is reduced, two persons can carry out installation without using any hoisting, and the installation convenience is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric arc heaters, in particular to a cold air mixing chamber of an electric arc heater. Background Art

[0002] With the development of spacecraft, the requirements for ground thermal protection tests are becoming increasingly higher. The test capability of ground thermal protection tests is required to cover as many flight orbit states of hypersonic aircraft as possible. One of the commonly used equipment for ground thermal protection tests is the arc heater, which heats the gas through a high-power electric arc to obtain high-temperature gas that meets the test requirements. The enthalpy adjustment range of conventional arc heaters is relatively narrow. Under actual operating conditions, the enthalpy range of tubular arc heaters is usually 1-5MJ / kg, and the enthalpy range of sheet arc heaters is usually 10-20MJ / kg, which means that there is no arc heater covering 5MJ / kg-10MJ / kg.

[0003] At present, in the development of new hypersonic aircraft, full-orbit thermal protection tests require an enthalpy range of 1MJ / kg-15MJ / kg, and existing arc heaters cannot meet the requirements.

[0004] Prior art methods have employed a cold air mixing chamber at the outlet of a blade-type arc heater to mix cold air into the hot airflow, thereby reducing the total airflow enthalpy. However, due to limitations in the cooling structure, existing cold air mixing chambers often utilize multiple separate air intake rings. An air intake ring is positioned between each two adjacent sections of cooling pipes, and the air intake rings are secured to the adjacent sections via flanges. While this approach meets the air intake requirements, the mixing chamber becomes excessively long, with excessive wall area, resulting in significant heat loss. Even without the introduction of cold air, the excessive heat loss reduces the maximum enthalpy of the gas exiting the cold air mixing chamber to 10MJ / kg, failing to meet the gas enthalpy range requirements for full-track thermal protection testing. Summary of the Invention

[0005] The object of the present invention is to provide a cold air mixing chamber for an arc heater, which reduces the inner wall area while meeting the air intake volume, thereby solving the technical problems in the above-mentioned background technology.

[0006] In order to achieve the above object, the present invention provides a cold air mixing chamber for an arc heater, comprising:

[0007] The tubular inner shell has a plurality of annular grooves distributed axially on its outer periphery, the plurality of annular grooves serving as cooling channels and air inlet channels alternately, a plurality of air inlet holes penetrating the tubular inner shell are distributed annularly at intervals at the bottom of the air inlet channels, and the air inlet holes are connected to the inner cavity of the tubular inner shell;

[0008] The same number of water sealing rings as the number of cooling channels are sleeved in the cooling channels and sealed with the side walls of the cooling channels. There is a gap between the water sealing rings and the bottom of the cooling channels to form cooling water channels. Water inlets and outlets are radially arranged on the water sealing rings for connecting to the water inlet pipe and the water outlet pipe respectively.

[0009] The same number of sealing rings as the number of inlet ducts are sleeved inside the inlet ducts and sealed with the side walls of the inlet ducts. There is a gap between the sealing rings and the bottom of the inlet ducts to form an inlet channel. The sealing rings are provided with inlet ports along the radial direction for connection with the inlet pipes.

[0010] Two connecting flanges are respectively arranged at two ends of the tubular inner shell.

[0011] Optionally, a boss is provided at each end of the tubular inner shell;

[0012] The connecting flange is sleeved outside the boss and fixed to the boss by welding.

[0013] Optionally, the tubular inner shell is made of copper, and the connecting flange is made of stainless steel.

[0014] Optionally, at least one annular groove is provided on the boss as a cooling channel at the boss, and a water sealing ring is provided in the cooling channel;

[0015] Two communication channels are radially arranged on the connecting flange and are respectively communicated with the water inlet and the water outlet of the water sealing ring at the boss.

[0016] Optionally, a limiting ring segment is provided at each of the two ends of the two bosses that are away from each other, and the outer diameter of the limiting ring segment is smaller than the outer diameter of the boss;

[0017] A retaining ring is provided inside the ring of the connecting flange, the inner diameter of the retaining ring is greater than or equal to the outer diameter of the limiting ring section and smaller than the outer diameter of the boss. When the connecting flange is sleeved on the boss, the retaining ring is sleeved on the limiting ring section and abuts against the boss in the axial direction.

[0018] A plurality of tie rods are arranged between the two connecting flanges. The plurality of tie rods are evenly spaced in the circumferential direction, and both ends of the tie rods are respectively connected to the two connecting flanges.

[0019] Optionally, the annular grooves are all stepped grooves, and the width of the groove bottom is smaller than the width of the upper part, and the water sealing ring and the air sealing ring both abut against the steps of the stepped grooves.

[0020] Optionally, the cold air mixing chamber further includes a water inlet device and a water outlet device, the water inlet device includes a water distribution pipe and water inlet pipes having the same number as the water inlet, one end of the water inlet pipe is connected to the water inlet, and the other end is connected to the water distribution pipe, and the water distribution pipe is provided with a water inlet main port connected to the water supply pipe;

[0021] The water outlet device includes a water collection pipe and water outlet pipes with the same number as the water outlets. One end of the water outlet pipe is connected to the water outlet, and the other end is connected to the water collection pipe. The water collection pipe is provided with a water outlet main port.

[0022] Optionally, the axial width of the air intake channel is smaller than the axial width of the cooling water channel, and the ratio of the axial width of the air intake channel to the axial width of the cooling water channel is in a range of 1:1.5 to 1:3.

[0023] Optionally, the air sealing ring is composed of two arc segments, the two arc segments are spaced apart and opposite to each other, two air inlets are formed at the two intervals, one end of the air inlet pipe is a circular tube, and the other end is a rectangular tube, the rectangular tube is welded to the two arc segments and connected to the air inlet; and / or

[0024] The sealing ring consists of two arc segments.

[0025] Optionally, both ends of the tubular inner shell and / or the connecting flange are provided with stoppers, one end of which is a convex stopper and the other end of which is a concave stopper that can match the convex stopper.

[0026] The above technical solution of the present invention has the following advantages:

[0027] The cold air mixing chamber of the arc heater provided by the present invention comprises a tubular inner shell, a water sealing ring, an air sealing ring and a connecting flange. The outer periphery of the tubular inner shell is axially distributed with a plurality of annular grooves, and the plurality of annular grooves alternately form cooling channels and air inlet channels. Each cooling channel is correspondingly provided with a water sealing ring, and the water sealing ring is spaced apart from the bottom of the cooling channel to form a cooling water channel, and a water inlet and a water outlet are radially arranged on the water sealing ring. Each air inlet channel is correspondingly provided with an air sealing ring, and the air sealing ring is spaced apart from the bottom of the air inlet channel to form an annular air inlet channel, and an air inlet is radially arranged on the air sealing ring, and an air inlet is provided at the bottom of the air inlet channel that penetrates the wall of the tubular inner shell, and connecting flanges are provided at both ends of the tubular inner shell. The cold air mixing chamber has a compact structure, and while meeting the air intake and cooling requirements, it can reduce the inner wall area as much as possible, avoid excessive heat loss, and increase the adjustment range of the gas enthalpy value, and can meet the gas enthalpy value range requirements of the full track thermal protection test. In addition, since the size of the cold air mixing chamber is reduced, the overall weight is reduced, and two people can install it without using any lifting equipment, which improves the convenience of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual product.

[0029] Figure 1 1 is a schematic structural diagram of a cold air mixing chamber of an arc heater according to an embodiment of the present invention;

[0030] Figure 2 yes Figure 1 A schematic diagram of the front view of the cold air mixing chamber of the arc heater;

[0031] Figure 3 yes Figure 2Schematic diagram of the cold air mixing chamber of the arc heater from the left;

[0032] Figure 4 yes Figure 3 AA cross-sectional diagram of the cold gas mixing chamber of the arc heater;

[0033] Figure 5 yes Figure 4 A magnified schematic diagram of part B in FIG.

[0034] Figure 6 yes Figure 4 A magnified schematic diagram of part C in FIG;

[0035] Figure 7 This is a schematic structural diagram of a tubular inner shell in an embodiment of the present invention;

[0036] Figure 8 yes Figure 7 A schematic front view of the middle tubular inner shell;

[0037] Figure 9 yes Figure 8 DD cross-section diagram of the middle tubular inner shell;

[0038] Figure 10 This is a front view structural diagram of a connecting flange in an embodiment of the present invention;

[0039] Figure 11 yes Figure 10 EE cross-sectional diagram of the middle connecting flange;

[0040] Figure 12 1 is a front view structural diagram of another connecting flange according to an embodiment of the present invention;

[0041] Figure 13 yes Figure 12 FF cross-sectional diagram of the middle connecting flange;

[0042] Figure 14 This is a schematic structural diagram of an air sealing ring connected to an air inlet pipe in an embodiment of the present invention;

[0043] Figure 15 yes Figure 14 A left side view of the structure after the middle sealing ring is connected to the intake pipe;

[0044] Figure 16 yes Figure 15 GG cross-sectional diagram of the structure after the middle sealing ring is connected to the intake pipe.

[0045] In the picture:

[0046] 1: tubular inner shell;

[0047] 11: cooling channel;

[0048] 12: air intake;

[0049] 121: air intake;

[0050] 13: boss;

[0051] 14: limiting ring segment;

[0052] 2: Water sealing ring;

[0053] 3: Gas sealing ring;

[0054] 31: intake pipe;

[0055] 4: Connecting flange;

[0056] 41: Connecting channel;

[0057] 42: retaining ring;

[0058] 5: Water inlet device;

[0059] 51: water distribution pipe;

[0060] 52: water inlet pipe;

[0061] 6: Water outlet device;

[0062] 61: water collection pipe;

[0063] 62: water outlet pipe;

[0064] 7: Pull rod;

[0065] 8: Stop talking. DETAILED DESCRIPTION

[0066] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0067] like Figures 1 to 4 As shown, the cold air mixing chamber of the arc heater provided by the embodiment of the present invention includes a tubular inner shell 1, a water sealing ring 2, an air sealing ring 3 and a connecting flange 4.

[0068] See also Figures 7 to 9As shown, the outer circumference of the tubular inner shell 1 is axially distributed with multiple annular grooves. These grooves alternately serve as cooling channels 11 and air inlet channels 12. That is, if the first annular groove serves as a cooling channel 11, the second adjacent annular groove serves as an air inlet channel 12, the third annular groove serves as a cooling channel 11, and so on. Two adjacent annular grooves share a groove wall. The annular grooves cover the entire outer circumference of the tubular shell 1. At the bottom of the air inlet channel 12, multiple air inlet holes 121 are annularly spaced and extend through the tubular inner shell 1. The air inlet holes 121 communicate with the inner cavity of the tubular inner shell 1, allowing air to enter the inner cavity.

[0069] See also Figure 1 、 Figure 2 、 Figures 4 to 6 As shown, each cooling channel 11 is correspondingly provided with a water sealing ring 2. Specifically, the water sealing ring 2 is sleeved in the cooling channel 11 and sealed with the side wall of the cooling channel 11 to prevent water leakage. The sealing connection between the water sealing ring 2 and the cooling channel 11 can adopt an existing sealing connection structure or sealing method, for example, a sealing ring is provided on the docking surface, and sealing is performed by welding, etc. In this embodiment, welding sealing is preferably adopted to achieve the connection and fixation of the third party while satisfying the sealing. More preferably, diffusion welding process is adopted for welding. There is a gap between the water sealing ring 2 and the bottom of the cooling channel 11, forming a relatively closed annular cooling water channel (connected to the outside only through the water inlet and the water outlet), and the water inlet and the water outlet are radially provided on the water sealing ring 2, which are used to connect the water inlet pipe and the water outlet pipe respectively.

[0070] See also Figure 1 、 Figure 2 、 Figures 14 to 16 As shown, each air inlet duct 12 is provided with a corresponding air sealing ring 3. Specifically, the air sealing ring 3 is sleeved in the air inlet duct 12 and sealed with the side wall of the air inlet duct 12. The sealing connection method refers to the sealing connection method between the water sealing ring 2 and the cooling duct 11, which will not be repeated here. Similarly, the air sealing ring 3 is spaced apart from the bottom of the air inlet duct 12 to form an annular air inlet channel. The air sealing ring 3 is provided with an air inlet port in the radial direction for connection with the air inlet pipe. The bottom of the air inlet duct 12 is provided with an air inlet hole 121 that penetrates the wall of the tubular inner shell 1. After passing through the air inlet channel, the gas enters the inner cavity of the tubular inner shell 1 through the air inlet hole 121 and mixes with the hot air flow therein.

[0071] See also Figures 1 to 4 As shown, connecting flanges 4 are provided at both ends of the tubular inner shell 1 to facilitate connection with upstream and downstream devices or to facilitate serial connection of multiple tubular inner shells 1 as needed.

[0072] During operation, the cold air mixing chamber's two ends are connected to an arc heater (not shown) and a nozzle (not shown) via connecting flanges 4, respectively. Depending on the gas enthalpy, ambient temperature gas is injected into the tubular housing for mixing and reducing the gas enthalpy. The air inlet holes 121 of each air inlet duct 12 can be uniformly controlled, allowing air to be admitted to only all or some of the inlet ducts 12 as needed. Multiple cold air mixing chambers can also be connected in series if necessary. Cooling water circulates continuously at high speed within each cooling water channel to ensure the cold air mixing chamber remains within a safe operating range. This compact cold air mixing chamber minimizes the internal wall area while meeting air intake and cooling requirements, preventing excessive heat loss and increasing the gas enthalpy adjustment range to meet the gas enthalpy range requirements for full-track thermal protection testing. Furthermore, due to the reduced size and overall weight of the cold air mixing chamber in this embodiment, compared to existing cold air mixing chambers that require hoisting equipment, this cold air mixing chamber can be installed by two people without any hoisting equipment, improving installation convenience.

[0073] In this embodiment, to ensure structural strength and conserve materials, the main body of the tubular inner shell 1 is integrally machined, while the connecting flange 4 is separately machined and then connected to the tubular inner shell 1. Specifically, a boss 13 is provided at each end of the tubular inner shell 1. The connecting flange 4 is sleeved over the boss 13 and secured thereto by welding.

[0074] In one example, the tubular inner shell 1 is made of copper, which provides excellent thermal conductivity. Cooling water is provided on the outer wall of the inner shell to protect the inner wall of the tubular inner shell 1 from being burned by high-temperature gases. The connecting flange 4 is made of stainless steel, which provides better structural strength and a more reliable connection.

[0075] To further improve the cooling effect, in one example, see Figures 4 to 6 As shown, at least one annular groove is provided on boss 13, serving as cooling channel 11 at boss 13. A water sealing ring 2 is positioned within cooling channel 11. Two radially extending connecting channels 41 are provided on connecting flange 4, communicating with the water inlet and outlet of water sealing ring 2 at boss 13, respectively, for mounting the water inlet and outlet pipes. Of course, in some examples, if air intake is required at connecting flange 4, multiple annular grooves may be provided, for example, two annular grooves, serving as cooling channel 11 and air inlet 12, respectively.

[0076] In order to improve the axial tensile strength of the cold air mixing chamber and improve the overall structural strength of the cold air mixing chamber, in one example, Figure 8 and Figure 9 As shown, the two ends of the two bosses 13 facing away from each other are respectively provided with a limiting ring segment 14, the outer diameter of the limiting ring segment 14 is smaller than the outer diameter of the boss 13, and the shape is stepped. Figure 5 、 Figure 6、 Figure 11 and Figure 13 As shown, a retaining ring 42 is provided inside the ring of the connecting flange 4. The inner diameter of the retaining ring 42 is greater than or equal to the outer diameter of the limiting ring segment 14 and smaller than the outer diameter of the boss 13. When the connecting flange 4 is sleeved on the boss 13, the retaining ring 42 is sleeved on the limiting ring segment 14 and axially abuts against the boss 13 (at the step). Figure 1 and Figure 2 As shown, multiple tie rods 7 are positioned between the two connecting flanges 4. These tie rods 7 are evenly spaced circumferentially, with each end of the tie rods 7 connected to the two connecting flanges 4. The tie rods 7 cooperate with the retaining ring segments 14 and the retaining ring 42 to achieve axial stability. In one example, the tie rods 7 are bolts, secured with nuts to tighten the two connecting flanges 4.

[0077] In order to facilitate the installation and positioning of the water sealing ring 2 and the air sealing ring 3, in one example, see Figure 5 、 Figure 6 、 Figure 8 and Figure 9 As shown, the annular grooves are all stepped grooves, and the width of the bottom groove is smaller than the width of the upper part, that is, the annular groove is divided into two sections, and the groove width of the lower section is smaller than the groove width of the upper section. The water sealing ring 2 and the air sealing ring 3 both rest on the steps of the stepped groove, which can ensure the accurate dimensions of the cooling water channel and the air inlet channel and facilitate installation and fixation. It should be noted that the stepped groove can be stepped on one side of the groove wall or on both sides of the groove wall. The stepped groove with stepped walls on both sides is preferably used.

[0078] In order to facilitate the arrangement of water supply and outlet, in one example, see Figures 1 to 4 As shown, the cold air mixing chamber of the arc heater further includes a water inlet device 5 and a water outlet device 6. The water inlet device 5 includes a water distribution pipe 51 and the same number of water inlet pipes 52 as the water inlets. One end of the water inlet pipe 52 is connected to the water inlet, and the other end is connected to the water distribution pipe 51. The water distribution pipe 51 is provided with a water inlet main port for connecting to a water source.

[0079] The water outlet device 6 includes a water collection pipe 61 and water outlet pipes 62, the same number as the water outlets. One end of the water outlet pipe 62 is connected to the water outlet, and the other end is connected to the water collection pipe 61. The water collection pipe 61 is provided with a main water outlet. In this way, the connection of the water supply end can be completed by simply connecting the main water inlet to the water supply pipe. Similarly, the connection of the water outlet can be completed by simply connecting the main water outlet to the main water outlet pipe. It should be noted that in this embodiment, the water inlet device 5 and the water outlet device 6 are distinguished according to the pipelines to which they are connected. The one connected to the water supply pipe is the water inlet device, and the one connected to the water outlet pipe is the water outlet device.

[0080] In this embodiment, to ensure adequate air intake, protect the tubular inner shell 1, and minimize heat loss due to the excessively large inner shell wall surface of the tubular inner shell 1, the axial width of the air intake channel is smaller than the axial width of the cooling water channel, and the ratio of the axial width of the air intake channel to the axial width of the cooling water channel is in the range of 1:1.5 to 1:3. For example, the axial width of the air intake channel is 4 mm, and the axial width of the cooling water channel is 7 mm. For another example, the axial width of the air intake channel is 4 mm, and the axial width of the cooling water channel is 10 mm. For another example, the axial width of the air intake channel is 5 mm, and the axial width of the cooling water channel is 13 mm. For another example, the axial width of the air intake channel is 6 mm, and the axial width of the cooling water channel is 18 mm.

[0081] In this embodiment, see Figures 14 to 16 As shown, the air sealing ring 3 is composed of two arc-shaped segments, which are convenient for installation in the air inlet 12. The two arc-shaped segments are spaced opposite to each other, and two air inlets are formed at the two intervals. One end of the air inlet pipe 31 is a circular tube, and the other end is a rectangular tube. The rectangular tube is welded to the two arc-shaped segments and is connected to the air inlet. In this way, the air inlet pipe 31 with a larger flow rate can be used to match the air sealing ring 3 with the smallest axial size as possible, and the corresponding air inlet 12 with a small axial size. In one example, the above-mentioned air inlet pipe 31 is obtained by flattening one end of a circular tube. Of course, it is also possible to select a pipe that has this shape when it is formed, and this is not limited here. Similarly, in order to facilitate installation, the water sealing ring 2 is also composed of two arc-shaped segments. The water inlet and outlet can be set on the arc-shaped segment or formed by the interval between the two arc-shaped segments, and this is not limited here.

[0082] To facilitate centering connection, in one example, see Figure 1 and Figure 2 As shown, the two ends of the tubular inner shell 1 and / or the connecting flange 4 are provided with stoppers 8, that is, the stoppers 8 can be set on the end face of the tubular inner shell 1, can also be set on the end face of the connecting flange 4, and can also be set partially on the end face of the tubular inner shell 1 and partially on the end face of the connecting flange 4. In order to facilitate the series connection of multiple tubular inner shells 1, preferably, the stopper 8 at one end is a convex stopper and the stopper 8 at the other end is a concave stopper, and the structures of the convex stopper and the concave stopper can match, that is, when two cold air mixing chambers are connected in series, the convex stopper can be inserted into the concave stopper. Sealing grooves for accommodating sealing rings can also be provided at the two ends of the tubular inner shell 1 and / or the connecting flange 4 to improve the sealing performance.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0084] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features thereof may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cold air mixing chamber of an arc heater, characterized in that: include: A tubular inner shell has a plurality of annular grooves distributed axially on its outer circumference, the plurality of annular grooves alternately serving as cooling channels and air inlet channels, a plurality of air inlet holes extending through the tubular inner shell and distributed annularly at intervals at the bottom of the air inlet channels, the air inlet holes being in communication with the inner cavity of the tubular inner shell; The same number of water sealing rings as the cooling channels are sleeved in the cooling channels and sealed with the side walls of the cooling channels. There is a gap between the rings and the bottom of the cooling channels to form cooling water channels. The water sealing rings are radially provided with water inlets and water outlets for connecting to water inlet pipes and water outlet pipes respectively. The same number of sealing rings as the air inlet ducts are sleeved in the air inlet ducts and sealed with the side walls of the air inlet ducts. There is a gap between the sealing rings and the bottom of the air inlet ducts to form an air inlet channel. The sealing rings are provided with air inlets in the radial direction for connection with the air inlet pipes. Two connecting flanges are respectively arranged at two ends of the tubular inner shell.

2. The cold air mixing chamber of the arc heater according to claim 1, characterized in that: Both ends of the tubular inner shell are respectively provided with a boss; The connecting flange is sleeved outside the boss and fixed to the boss by welding.

3. The cold air mixing chamber of the arc heater according to claim 2, characterized in that: The tubular inner shell is made of red copper, and the connecting flange is made of stainless steel.

4. The cold air mixing chamber of the arc heater according to claim 2, characterized in that: At least one annular groove is provided on the boss as a cooling channel for the boss, and the water sealing ring is sleeved in the cooling channel; The connecting flange is provided with two connecting channels in the radial direction, which are respectively communicated with the water inlet and the water outlet of the water sealing ring at the boss.

5. The cold air mixing chamber of the arc heater according to claim 2, characterized in that: A limiting ring segment is provided at each end of the two bosses that are away from each other, and the outer diameter of the limiting ring segment is smaller than the outer diameter of the boss; A retaining ring is provided inside the ring of the connecting flange, and the inner diameter of the retaining ring is greater than or equal to the outer diameter of the limiting ring segment and smaller than the outer diameter of the boss. When the connecting flange is sleeved on the boss, the retaining ring is sleeved on the limiting ring segment and axially abuts against the boss; A plurality of tie rods are provided between the two connecting flanges. The plurality of tie rods are evenly spaced and distributed in the circumferential direction. Both ends of the tie rods are respectively connected to the two connecting flanges.

6. The cold air mixing chamber of the arc heater according to claim 1 or 4, characterized in that: The annular grooves are all stepped grooves, and the width of the groove bottom is smaller than the width of the upper part. The water sealing ring and the air sealing ring both abut against the steps of the stepped grooves.

7. The cold air mixing chamber of the arc heater according to claim 1, characterized in that: It also includes a water inlet device and a water outlet device, the water inlet device includes a water distribution pipe and water inlet pipes with the same number as the water inlet, one end of the water inlet pipe is connected to the water inlet, and the other end is connected to the water distribution pipe, and the water distribution pipe is provided with a water inlet main port connected to the water supply pipe; The water outlet device includes a water collection pipe and water outlet pipes with the same number as the water outlets. One end of the water outlet pipe is connected to the water outlet, and the other end is connected to the water collection pipe. The water collection pipe is provided with a water outlet main port.

8. The cold air mixing chamber of the arc heater according to claim 1, characterized in that: The axial width of the air intake channel is smaller than the axial width of the cooling water channel, and the ratio of the axial width of the air intake channel to the axial width of the cooling water channel is in a range of 1:1.5 to 1:

3.

9. The cold air mixing chamber of the arc heater according to claim 1 or 2, characterized in that: The air sealing ring is composed of two arc segments, the two arc segments are spaced apart and opposite to each other, and two air inlets are formed at the two intervals. One end of the air inlet pipe is a circular tube, and the other end is a rectangular tube. The rectangular tube is welded to the two arc segments and communicates with the air inlets; and / or The water sealing ring consists of two arc-shaped segments.

10. The cold air mixing chamber of the arc heater according to claim 1, characterized in that: Both ends of the tubular inner shell and / or the connecting flange are provided with stoppers, one end of which is a convex stopper and the other end of which is a concave stopper that can match the convex stopper.

Images