End surface driven film clamping device

Abstract

The present invention discloses an end-face driven diaphragm clamping device. The driving section and the swivel nut of the diaphragm clamping device are an integral whole, which is the left section; the diaphragm ring, transition nut, driven section, ear shaft, double ear support, single ear support, and oil cylinder are an integral whole, which is the right section; the cutting groove of the swivel nut with uniform internal thread cutting corresponds to the unremoved threaded portion of the transition nut with uniform external thread cutting; the transition nut is driven by the oil cylinder to rotate relative to the driven section and the swivel nut, driving the driven section to move closer to the driving section, so that the diaphragm and the diaphragm clamping ring are clamped. The diaphragm clamping device includes the ear shaft, double ear support, single ear support and oil cylinder drive device, which are all installed on the end face of the swivel nut, reducing the radial space occupation. The end-face driven diaphragm clamping device of the present invention can provide sufficient clamping force for the diaphragm of ground test equipment such as shock wind tunnels, and is particularly suitable for situations where the shock tube has a large diameter, high clamping force requirements, and limited circumferential space.

Description

Technical Field

[0001] The invention belongs to the technical field of hypersonic test equipment, and in particular relates to an end surface driven film clamping device. Background Art

[0002] Pulse test equipment such as shock wave wind tunnels are essential key equipment for ultra-high-speed ground simulation tests. Such equipment has a common feature: before the test, a metal diaphragm is used to divide the shock tube into several sections, and different sections are filled with gases of different pressures. During the test, measures are taken to break the membrane to complete the test. Therefore, it is necessary to design a device between different sections of the shock tube to ensure the diaphragm is clamped and sealed, which is the membrane clamping device.

[0003] The cut thread clamping device and the full thread clamping device are two commonly used thread clamping methods. The clamping principles of the cut thread clamping device and the full thread clamping device are similar, that is, a rotary nut with positive and negative threads processed on both ends is used to connect different pipe sections, and a cylinder is installed on the outside of the rotary nut to drive the rotary nut to rotate forward or reversely, so that the two pipe sections are brought together or separated to clamp / loosen the film. The thread clamping device has the advantages of a large range of applicable wind tunnel diameters and a small body size of the clamping device. However, the driving cylinders of the current thread clamping devices are installed on both sides of the rotary nut, and the rotary nut is driven to rotate tangentially, and the driving device occupies a large radial space. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide an end surface driven film clamping device.

[0005] The end face driven film clamping device of the present invention is characterized in that the film clamping device comprises a driving section, a rotary nut, a diaphragm, a film clamping ring, a transition nut, a driven section, an ear shaft, a double ear support, a single ear support and an oil cylinder;

[0006] Driving section: It is the upstream section of the shock tube, with a cylindrical cavity inside. During the test, the cavity is filled with high-pressure driving gas. The right end of the driving section is provided with an external thread, which is threadedly connected with the internal thread on the left side of the slewing nut;

[0007] Swivel nut: connects the upstream pipe section and the downstream pipe section of the shock tube, and has internal threads at both ends of the inner hole. The left internal thread is connected to the external thread at the right end of the driving section, and the right internal thread is connected to the transition nut. The right internal thread is a uniformly cut internal thread, that is, a groove for uniform cutting is opened on the right internal thread, and the number of grooves is 2n, n ≥ 3; a keyway is processed at the position where the right end face of the swivel nut is connected to the double-ear support;

[0008] Diaphragm: a thin sheet located between the driving section and the driven section, clamped by the driving section and the driven section, used to isolate the driving section and the driven section of the shock tube;

[0009] Diaphragm ring: It is cylindrical and installed downstream of the diaphragm. It is used to withstand the impact of each petal after the diaphragm is opened and to accommodate each petal of the diaphragm when it is opened.

[0010] Transition nut: used to connect the slewing nut and the driven section. The inner hole of the transition nut is processed with an internal thread, which is connected to the external thread of the driven section through the internal thread. The outer circumference of the transition nut is processed with an external thread. The external thread is a uniformly cut external thread assembled with the uniformly cut internal thread of the slewing nut. The cutting angle of the uniformly cut external thread of the transition nut corresponds to the cutting angle of the uniformly cut internal thread of the slewing nut. The rotation direction of the uniformly cut external thread of the transition nut is opposite to that of the uniformly cut internal thread of the slewing nut.

[0011] Driven section: It is the downstream section of the shock tube, with a cylindrical cavity inside. During the test, the cavity is filled with low-pressure driven gas and connected to the transition nut through an external thread;

[0012] Trunnion: The two ends of the cylinder are connected to the double-ear support and the single-ear support respectively through the trunnion, and the end of the cylinder rotates around the trunnion or slides along the trunnion;

[0013] Double-ear support: The left end face of the double-ear support has a boss that fits into the keyway of the right end face of the slewing nut. When the clamping device is in the closed state, the boss of the double-ear support is inserted into the keyway of the slewing nut. The double-ear support has one above and one below the driven section, which is fixed to the driven section by keys and screws.

[0014] Single-ear support: There is one single-ear support on each side of the driven section, fixed to the transition nut by keys and screws;

[0015] Cylinder: There are 4 sets of cylinders, installed between the double-ear supports and the single-ear supports.

[0016] The driving section and the diaphragm are sealed by a sealing ring.

[0017] The diaphragm and the clamping membrane ring are sealed by a sealing ring.

[0018] The clamping membrane ring and the driven section are sealed by a sealing ring.

[0019] The oil cylinders have the same size and are installed opposite to each other in pairs.

[0020] Before the diaphragm is installed, the end face driven diaphragm device of the present invention is in a separated state, wherein the driving section and the rotating nut are a whole, which is the left section; the diaphragm ring, the transition nut, the driven section, the ear shaft, the double-ear support, the single-ear support, and the oil cylinder are a whole, which is the right section; the cutting groove of the rotating nut with uniformly cut internal threads corresponds to the unremoved threaded portion of the transition nut with uniformly cut external threads; at this time, the diaphragm can be disassembled, installed, and other operations.

[0021] After the diaphragm is installed, the separated left and right sections are brought together. At this time, the cylinder drives the transition nut to rotate relative to the driven section and the slewing nut, driving the driven section to move closer to the driving section, so that the diaphragm and the diaphragm ring are clamped.

[0022] After the test is completed, the oil cylinder drives the transition nut to rotate in the opposite direction relative to the driven section and the rotary nut, driving the driven section away from the driving section and removing the clamping force of the diaphragm and the diaphragm ring; after the oil cylinder completes the movement into place, the cutting groove of the rotary nut with uniformly cut internal threads corresponds to the unremoved threaded portion of the transition nut with uniformly cut external threads, and then the closed left section and the right section are separated to facilitate operations such as diaphragm removal and installation.

[0023] The end face driven diaphragm device of the present invention continues the advantages of conventional thread cutting diaphragm devices, namely, a wide range of wind tunnel diameters applicable to the diaphragm device and a small volume of the diaphragm device body; at the same time, since the driving device of the end face driven diaphragm device of the present invention, including the ear shaft, double ear support, single ear support and oil cylinder are all installed on the end face of the swivel nut, the radial space occupancy is reduced.

[0024] The action fulcrums of the oil cylinder in the end surface driven film clamping device of the present invention are respectively on the driven section and the transition nut, and the action force is the internal force of the system, which has little effect on other parts.

[0025] The end-face driven diaphragm clamping device of the present invention can provide sufficient clamping force for the diaphragm of ground test equipment such as shock wind tunnels, and is particularly suitable for situations where the shock tube has a large diameter, high clamping force requirements, and limited circumferential space. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the end surface driven film clamping device of the present invention;

[0027] Figure 2 It is a right side view of the end surface driven film clamping device of the present invention.

[0028] In the figure, 1. driving section 2. rotating nut 3. diaphragm 4. diaphragm ring 5. transition nut 6. driven section 7. ear shaft 8. double ear support 9. single ear support 10. cylinder. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0031] Example 1

[0032] like Figure 1 , 2As shown, the end surface driven diaphragm clamping device of the present invention comprises a driving section 1, a rotary nut 2, a diaphragm 3, a diaphragm clamping ring 4, a transition nut 5, a driven section 6, an ear shaft 7, a double ear support 8, a single ear support 9 and a cylinder 10;

[0033] Driving section 1: It is the upstream section of the shock tube, with a cylindrical cavity inside. During the test, the cavity is filled with high-pressure driving gas. The right end of the driving section 1 is provided with an external thread, which is threadedly connected with the internal thread on the left side of the slewing nut 2;

[0034] Rotary nut 2: connects the upstream pipe section and the downstream pipe section of the shock tube, and has internal threads at both ends of the inner hole. The left internal thread is connected to the external thread at the right end of the driving section 1, and the right internal thread is connected to the transition nut 5. The right internal thread is a uniformly cut internal thread, that is, a groove for uniform cutting is opened on the right internal thread, and the number of grooves is 2n, n ≥ 3; a keyway is processed at the position where the right end face of the rotary nut 2 is connected to the double-ear support 8;

[0035] Diaphragm 3: a thin sheet located between the driving section 1 and the driven section 6, clamped by the driving section 1 and the driven section 6, and used to isolate the driving section 1 and the driven section 6 of the shock tube;

[0036] The clamping ring 4 is cylindrical and installed downstream of the diaphragm 3 to withstand the impact of the petals after the diaphragm 3 is opened and to accommodate the petals of the diaphragm 3 when they are opened;

[0037] Transition nut 5: used to connect the rotary nut 2 and the driven section 6. The inner hole of the transition nut 5 is processed with an internal thread, which is connected to the external thread of the driven section 6 through the internal thread. The outer circumference of the transition nut 5 is processed with an external thread, which is a uniformly cut external thread assembled with the uniformly cut internal thread of the rotary nut 2. The cutting angle of the uniformly cut external thread of the transition nut 5 corresponds to the cutting angle of the uniformly cut internal thread of the rotary nut 2; the rotation direction of the uniformly cut external thread of the transition nut 5 is opposite to that of the uniformly cut internal thread of the rotary nut 2;

[0038] Driven section 6: It is the downstream section of the shock tube, with a cylindrical cavity inside. During the test, the cavity is filled with low-pressure driven gas and is connected to the transition nut 5 through an external thread;

[0039] Ear shaft 7: The two ends of the oil cylinder 10 are connected to the double ear support 8 and the single ear support 9 respectively through the ear shaft 7, and the end of the oil cylinder 10 rotates around the ear shaft 7 or slides along the ear shaft 7;

[0040] Double-ear support 8: The left end face of the double-ear support 8 has a boss matched with the keyway of the right end face of the slewing nut 2. When the clamping device is in the closed state, the boss of the double-ear support 8 is inserted into the keyway of the slewing nut 2; the double-ear support 8 has one above and one below the driven section 6, and is fixed to the driven section 6 by keys and screws;

[0041] Single-ear support 9: There is one single-ear support 9 on each of the left and right sides of the driven section 6, and it is fixed on the transition nut 5 by a key and a screw;

[0042] Oil cylinder 10: There are 4 sets of oil cylinder 10, which are installed between the double-ear support 8 and the single-ear support 9.

[0043] The driving section 1 and the diaphragm 3 are sealed by a sealing ring.

[0044] The diaphragm 3 and the clamping membrane ring 4 are sealed by a sealing ring.

[0045] The clamping membrane ring 4 and the driven section 6 are sealed by a sealing ring.

[0046] The oil cylinders 10 have the same size and are installed opposite to each other in pairs.

[0047] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An end surface driven film clamping device, characterized in that: The diaphragm clamping device comprises a driving section (1), a rotary nut (2), a diaphragm (3), a diaphragm clamping ring (4), a transition nut (5), a driven section (6), an ear shaft (7), a double ear support (8), a single ear support (9) and an oil cylinder (10); The driving section (1) is the upstream section of the shock tube, and has a cylindrical cavity inside. During the test, the cavity is filled with high-pressure driving gas. The right end of the driving section (1) is provided with an external thread, which is threadedly connected to the left internal thread of the rotary nut (2); The swivel nut (2) is connected to the upstream pipe section and the downstream pipe section of the shock tube. The two ends of the inner hole are respectively processed with internal threads. The left internal thread is connected to the external thread at the right end of the driving section (1). The right internal thread is connected to the transition nut (5). The right internal thread is a uniformly cut internal thread, that is, a groove for uniform cutting is opened on the right internal thread. The number of grooves is 2n, and n is greater than or equal to 3. The right end face of the swivel nut (2) is processed with a keyway at the position where it is connected to the double-ear support (8); The diaphragm (3) is a thin sheet located between the driving section (1) and the driven section (6), clamped by the driving section (1) and the driven section (6), and used to isolate the driving section (1) and the driven section (6) of the shock tube; The clamping ring (4) is cylindrical and installed downstream of the diaphragm (3) to withstand the impact of the petals after the diaphragm (3) is opened and to accommodate the petals of the diaphragm (3) when they are opened; The transition nut (5) is used to connect the rotary nut (2) and the driven section (6). The inner hole of the transition nut (5) is processed with an internal thread, which is connected to the external thread of the driven section (6) through the internal thread. The outer circumference of the transition nut (5) is processed with an external thread. The external thread is a uniformly cut external thread assembled with the uniformly cut internal thread of the rotary nut (2). The cutting angle of the uniformly cut external thread of the transition nut (5) corresponds to the cutting angle of the uniformly cut internal thread of the rotary nut (2); the rotation direction of the uniformly cut external thread of the transition nut (5) is opposite to that of the uniformly cut internal thread of the rotary nut (2). The driven section (6) is the downstream section of the shock tube, and has a cylindrical cavity inside. During the test, the cavity is filled with low-pressure driven gas and is connected to the transition nut (5) through an external thread. Ear shaft (7): The two ends of the oil cylinder (10) are respectively connected to the double ear support (8) and the single ear support (9) through the ear shaft (7), and the end of the oil cylinder (10) rotates around the ear shaft (7) or slides along the ear shaft (7); Double-ear support (8): The left end face of the double-ear support (8) is provided with a boss matched with the keyway of the right end face of the slewing nut (2). When the film clamping device is in a closed state, the boss of the double-ear support (8) is inserted into the keyway of the slewing nut (2). The double-ear support (8) is provided one above and one below the driven section (6), and is fixed to the driven section (6) by a key and a screw. Single-ear support (9): There is one single-ear support (9) on each of the left and right sides of the driven section (6), and it is fixed on the transition nut (5) by a key and a screw; Oil cylinder (10): There are 4 sets of oil cylinder (10), which are installed between the double-ear support (8) and the single-ear support (9).

2. The end surface driven film clamping device according to claim 1, characterized in that: The driving section (1) and the diaphragm (3) are sealed via a sealing ring.

3. The end surface driven film clamping device according to claim 1, characterized in that: The diaphragm (3) and the clamping membrane ring (4) are sealed via a sealing ring.

4. The end surface driven film clamping device according to claim 1, characterized in that: The clamping membrane ring (4) and the driven section (6) are sealed via a sealing ring.

5. The end surface driven film clamping device according to claim 1, characterized in that: The oil cylinders (10) have the same size and are installed opposite to each other in pairs.

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