A static pressure measuring device for wind tunnel

Abstract

The present invention discloses a static pressure measuring device for a wind tunnel, comprising a flow channel wall plate, wherein a static pressure detection component is arranged on the flow channel wall plate, the static pressure detection component comprises a first mounting groove opened on the flow channel wall plate, a second mounting groove is opened at one end of the first mounting groove, the second mounting groove penetrates to the other side surface of the flow channel wall plate, the inner diameter of the first mounting groove is larger than the inner diameter of the second mounting groove, a detection head is installed inside the first mounting groove, a first connecting block is installed on one side of the detection head, the first connecting block is located inside the second mounting groove, and an end groove is opened at one end of the first connecting block away from the detection head; in the present invention, during operation, a V-shape is formed by two clamping cylinders, and the lower plate moves downward, so that the first spring is continuously compressed, and pressure is generated on the first connecting block and the second connecting block to approach each other, and the detection head is tightly attached to the inner wall of the second mounting groove to avoid air leakage, and at the same time, the front measuring hole and the rear measuring hole are tightly connected.

Description

Technical Field

[0001] The invention belongs to the technical field of wind tunnel measurement, and in particular relates to a static pressure measurement device for a wind tunnel. Background Art

[0002] According to the patent document with the authorization announcement number "CN114608793B" and the invention name "A static pressure measuring device for a wind tunnel and a static pressure measuring method thereof", the specification states: the measuring head is installed on the wall plate of the flow channel in the wind tunnel, the sealing gasket is installed in the connecting and mounting hole inside the measuring head, and the adapter is threadedly connected to the measuring head to tighten the sealing gasket; the nut is threadedly connected to the measuring head to tighten the measuring head; a metal capillary is welded at the tail of the adapter and connected to the pressure sensor; in this embodiment, the static pressure measuring hole (composed of a front measuring hole and a rear measuring hole) of the static pressure measuring device for a wind tunnel realizes the bidirectional fixation of the static pressure measuring point, thereby avoiding the problem of falling off during long-term operation and improving the safety of wind tunnel operation, but the following defects still exist:

[0003] The device is fixed to the flow channel wall plate by nuts for testing. However, after long-term use, the nuts may become loose, which will affect the tightness of the device connection. The device may become loose inside and a gap may occur in the slot between the device and the flow channel wall plate, affecting the stability of static pressure measurement. Summary of the invention

[0004] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a static pressure measuring device for a wind tunnel, which effectively solves the problem that the device may become loose when being fixed to the channel wall plate by nuts.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: a static pressure measuring device for a wind tunnel, comprising a flow channel wall plate, on which a static pressure detection assembly is arranged;

[0006] The static pressure detection component includes a first mounting groove opened on the flow channel wall plate, a second mounting groove is opened at one end of the first mounting groove, and the second mounting groove extends to the other side surface of the flow channel wall plate, the inner diameter of the first mounting groove is larger than the inner diameter of the second mounting groove, a detection head is installed inside the first mounting groove, a first connecting block is installed on one side of the detection head, the first connecting block is located inside the second mounting groove, an end groove is opened at the end of the first connecting block away from the detection head, and the second connecting block is installed inside the end groove, a front measuring hole is opened inside the first connecting block, a rear measuring hole is opened inside the second connecting block, and a connecting pipe is installed at the end of the second connecting block away from the detection head, the front measuring hole, the rear measuring hole and the connecting pipe are coaxially arranged and have the same inner diameter, and a clamping mounting component is installed between the first connecting block and the second connecting block, and the clamping mounting component is used to clamp and fix the first connecting block and the second connecting block.

[0007] Preferably, the clamping and mounting assembly comprises a fixing plate arranged above the first connecting block, a supporting plate is installed at the bottom end of the fixing plate, the supporting plate contacts the top wall of the first connecting block, and a downward-moving clamping member is installed on the fixing plate;

[0008] The downward moving clamping member includes a downward moving plate arranged below the fixed plate, two swivel seats are symmetrically installed at the bottom end of the downward moving plate, and a rotating clamping member is installed on the swivel seat. The two rotating clamping members generate mutual pressing pressure on the first connecting block and the second connecting block. A negative pressure fixing member for fixing the fixed plate is installed between the fixed plate and the flow channel wall plate, and clamping fixing members are installed on both sides of the downward moving plate. The clamping fixing members are used to clamp the downward moving plate, the first connecting block and the second connecting block.

[0009] Preferably, a limiting rotating sleeve is fixedly installed on the top of the lower moving plate, a clamping screw is provided above the lower moving plate, the bottom end of the clamping screw is fixedly installed on the limiting rotating block, the limiting rotating block is rotatably installed inside the limiting rotating sleeve, a second screw barrel is installed on the fixed plate, and the clamping screw is threadably installed inside the second screw barrel.

[0010] Preferably, the rotating clamping member includes two connecting heads, each of which is provided with a rotating groove, a clamping cylinder is installed on the lower connecting head, a pressure block is movably installed inside the pressure cylinder, a pressure rod is fixedly installed between the pressure block and the upper connecting head, a first spring is symmetrically installed on the side of the pressure block away from the pressure rod, one end of the first spring is fixedly connected to the inner wall of the end of the clamping cylinder, the upper connecting head is rotatably connected to the rotating shaft on the rotating seat, and a fixed connecting member is connected to the lower connecting head.

[0011] Preferably, the fixed connecting member includes a U-shaped seat, a first screw barrel is installed on the side wall of the U-shaped seat, a rotating shaft screw is provided on the inner side of the U-shaped seat, the rotating shaft screw is threadedly connected to the first screw barrel, and the connecting head below is rotatably connected to the rotating shaft screw. Annular grooves are provided on the end outer wall of the first connecting block and the outer wall of the second connecting block. The two U-shaped seats are fixedly installed on the top walls of the two annular grooves respectively. The top of the U-shaped seat is flush with the top wall of the first connecting block, which facilitates the disassembly of the first connecting block. The distance between the two U-shaped seats is smaller than the distance between the two rotating seats, so that the two rotating clamping members are arranged in a V shape.

[0012] Preferably, the negative pressure fixing member includes a negative pressure tube equidistantly installed on the fixed plate near the side of the flow channel wall plate, a suction cup is fixedly installed on the end of the negative pressure tube, the end face of the suction cup is in contact with the surface of the flow channel wall plate, a movable groove is opened inside the fixed plate, the movable groove is connected with each negative pressure tube, a movable plate is movably installed inside the movable groove, a piston is movably installed inside the negative pressure tube, and a connecting rod is fixedly installed between the piston and the movable plate.

[0013] Preferably, a sliding groove is provided at the bottom end of the movable groove, which extends to the bottom end of the fixed plate. A connecting rod is provided between the movable plate and the lower plate. The two ends of the connecting rod are respectively hinged to the movable plate and the lower plate. The connecting rod is located on the inner side of the sliding groove. The lower plate moves downward and pulls the piston through the connecting rod to move toward the side away from the suction cup.

[0014] Preferably, the clamping fixing member includes side rods symmetrically installed on both sides of the lower moving plate, the ends of the side rods are fixedly installed with a first vertical plate, the two first vertical plates are symmetrically arranged on both sides of the first connecting block, a third clamping groove is opened on the first vertical plate, and the second vertical plate is symmetrically installed at the bottom end of the fixed plate, the two second vertical plates are respectively located on the side of the two first vertical plates away from each other, a side tube is fixedly installed on the side of the second vertical plate away from the first connecting block, a clamping rod is movably installed inside the side tube, one end of the clamping rod passes through a side of the second vertical plate close to the first vertical plate, and one end of the clamping rod contacts the first vertical plate, the other end of the clamping rod is fixedly installed with a second spring, and the other end of the clamping rod is fixedly installed with a pull rod.

[0015] Preferably, the second connecting block is symmetrically provided with a first card slot on both sides, the first connecting block is symmetrically provided with a second card slot on both sides, the first card slot, the second card slot and the card rod are coaxially arranged, and when the lower plate moves downward and drives the third card slot to move to a coaxial position with the first card slot, the card rod passes through the third card slot and the second card slot under the action of the second spring and is inserted into the first card slot.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1) During operation, the position of the fixed plate is determined by contacting the supporting plate with the top wall of the second connecting block and the end face of the suction cup with the surface of the flow channel wall plate, and the two pressing cylinders at the bottom of the lower moving plate are connected to the first connecting block and the second connecting block respectively, so that the two pressing cylinders form a V shape, and the lower moving plate moves downward, so that the first spring is continuously compressed, and pressure is generated on the first connecting block and the second connecting block to approach each other, and the detection head is closely attached to the inner wall of the second mounting groove to avoid air leakage, and at the same time, the front measuring hole and the rear measuring hole are closely connected to improve the detection stability;

[0018] 2) During operation, one end of the first connection block is limited by the detection head, and when the lower plate moves downward, the piston is pulled by the connecting rod to move toward the fixed plate in the negative pressure tube, so that negative pressure is generated between the suction cup and the flow channel wall plate, thereby fixing the fixed plate and limiting the other end of the first connection block at the same time, thereby improving the installation stability of the first connection block in the first installation groove and improving the detection stability;

[0019] 3) During operation, when the first connecting block and the second connecting block are pressed tightly, the first clamping groove and the second clamping groove are coaxially arranged, and the first spring is compressed when the lower plate moves, so that in the process of pressing the first clamping groove and the second clamping groove, the first vertical plate moves downward with the lower plate until the third clamping groove is coaxial with the first clamping groove, and at this time, the clamping rod passes through the third clamping groove and the second clamping groove under the elastic force of the second spring and is clamped into the first clamping groove, so that the lower plate, the first connecting block and the second connecting block are clamped and fixed, and the first connecting block and the second connecting block are fixed, so that the first connecting block, the second connecting block and the flow channel wall plate are tightly connected, thereby improving the measurement stability;

[0020] 4) During work, after the first connecting block and the second connecting block are installed, and after the two clamping cylinders and the first connecting block and the second connecting block are installed, it is only necessary to turn the clamping screw to fix the fixed plate, clamp the first connecting block and the second connecting block, and fix the first connecting block, the second connecting block and the lower plate, so as to facilitate installation. At the same time, the clamping screw can self-lock the position of the lower plate to improve installation stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

[0022] In the attached picture:

[0023] Figure 1 It is a schematic structural diagram of a static pressure measuring device for a wind tunnel according to the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the static pressure detection assembly of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of the fixed connection member of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the front measuring hole and the rear measuring hole of the present invention;

[0027] Figure 5 It is a schematic diagram of the fixing plate structure of the present invention;

[0028] Figure 6 It is a schematic diagram of the internal structure of the fixing plate of the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the rotating pressing member of the present invention;

[0030] Figure 8 It is a schematic diagram of the structure of the negative pressure fixing member of the present invention;

[0031] Fig. 9 It is a schematic diagram of the structure of the clamping fixing member of the present invention.

[0032] In the figure: 1, flow channel wall plate; 2, static pressure detection assembly; 201, first installation groove; 202, second installation groove; 203, detection head; 204, first connecting block; 205, front measuring hole; 206, end groove; 207, second connecting block; 208, rear measuring hole; 209, connecting pipe; 3, clamping installation assembly; 301, annular groove; 302, fixed connecting piece; 3021, U-shaped seat; 3022, first screw barrel; 3023, rotating shaft screw; 303, first clamping groove; 304, second clamping groove; 305, fixing plate; 306, downward pressing piece; 3061, downward plate; 3062, second screw barrel; 3063, clamping screw; 3064, limit rotating sleeve; 3065, limit Rotating block; 3066, rotating seat; 307, supporting plate; 308, rotating pressing member; 3081, connecting head; 3082, rotating groove; 3083, pressing cylinder; 3084, pressing rod; 3085, pressing block; 3086, first spring; 309, negative pressure fixing member; 3091, negative pressure tube; 3092, suction cup; 3093, movable groove; 3094, sliding groove; 3095, movable plate; 3096, connecting rod; 3097, piston; 3098, connecting rod; 310, clamping fixing member; 3101, side rod; 3102, first vertical plate; 3103, third clamping groove; 3104, second vertical plate; 3105, side cylinder; 3106, clamping rod; 3107, second spring; 3108, pulling rod. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0034] Embodiment 1, by Figure 1-9 The present invention relates to a static pressure measuring device for a wind tunnel, comprising a flow channel wall plate 1, on which a static pressure detection component 2 is arranged;

[0035] The static pressure detection component 2 includes a first mounting groove 201 provided on the flow channel wall plate 1, a second mounting groove 202 is provided at one end of the first mounting groove 201, and the second mounting groove 202 extends to the other side surface of the flow channel wall plate 1, the inner diameter of the first mounting groove 201 is larger than the inner diameter of the second mounting groove 202, a detection head 203 is installed inside the first mounting groove 201, a first connecting block 204 is installed on one side of the detection head 203, the first connecting block 204 is located inside the second mounting groove 202, and an end groove 206 is provided at one end of the first connecting block 204 away from the detection head 203, and the end groove 206 is provided at the end of the first connecting block 204. A second connecting block 207 is installed inside the groove 206, a front measuring hole 205 is opened inside the first connecting block 204, a rear measuring hole 208 is opened inside the second connecting block 207, a connecting tube 209 is installed at the end of the second connecting block 207 away from the detection head 203, the front measuring hole 205, the rear measuring hole 208 and the connecting tube 209 are coaxially arranged and have the same inner diameter, a clamping installation component 3 is installed between the first connecting block 204 and the second connecting block 207, and the clamping installation component 3 is used to clamp and fix the first connecting block 204 and the second connecting block 207.

[0036] The clamping installation assembly 3 includes a fixed plate 305 arranged above the first connecting block 204, a support plate 307 is installed at the bottom end of the fixed plate 305, and the support plate 307 contacts the top wall of the first connecting block 204. A downward pressing member 306 is installed on the fixed plate 305, and the downward pressing member 306 includes a downward moving plate 3061 arranged below the fixed plate 305, and two rotating seats 3066 are symmetrically installed at the bottom end of the downward moving plate 3061. A rotating pressing member 308 is installed on the rotating seat 3066. The two rotating pressing members 308 generate a mutually pressing pressure on the first connecting block 204 and the second connecting block 207. A fixing plate 305 is installed between the fixed plate 305 and the flow channel wall plate 1 for clamping the fixed plate 305 is fixed with a negative pressure fixing piece 309, and clamping fixing pieces 310 are installed on both sides of the lower moving plate 3061. The clamping fixing pieces 310 are used to clamp the lower moving plate 3061, the first connecting block 204 and the second connecting block 207. A limiting rotating sleeve 3064 is fixedly installed on the top of the lower moving plate 3061, and a clamping screw 3063 is provided above the lower moving plate 3061. The bottom end of the clamping screw 3063 is fixedly installed on the limiting rotating block 3065. The limiting rotating block 3065 is rotatably installed inside the limiting rotating sleeve 3064. A second screw barrel 3062 is installed on the fixed plate 305, and the clamping screw 3063 is threadedly installed inside the second screw barrel 3062.

[0037] The rotating pressing member 308 includes two connecting heads 3081, and a rotating groove 3082 is opened on the connecting head 3081. A pressing cylinder 3083 is installed on the lower connecting head 3081. After the first connecting block 204 and the second connecting block 207 are installed, the two pressing cylinders 3083 and the first connecting block 204 and the second connecting block 207 are installed, and the fixing of the fixing plate 305, the pressing between the first connecting block 204 and the second connecting block 207, and the fixing between the first connecting block 204, the second connecting block 207 and the lower moving plate 3061 can be achieved by simply twisting the pressing screw 3063 and rotating it, which is convenient for installation. At the same time, the pressing screw 3063 can The position of the plate 3061 is self-locking to improve the installation stability. A pressing block 3085 is movably installed inside the pressing cylinder 3083. A pressing rod 3084 is fixedly installed between the pressing block 3085 and the upper connecting head 3081. A first spring 3086 is symmetrically installed on the side of the pressing block 3085 away from the pressing rod 3084. One end of the first spring 3086 is fixedly connected to the inner wall of the end of the pressing cylinder 3083. The upper connecting head 3081 is rotatably connected to the rotating shaft on the rotating seat 3066. The lower connecting head 3081 is connected to a fixed connecting piece 302. The fixed connecting piece 302 includes a U-shaped seat 3021. The side wall of the U-shaped seat 3021 is equipped with a first screw cylinder 3022. A rotating shaft screw 3023 is provided on the inner side of the U-shaped seat 3021, and the rotating shaft screw 3023 is threadedly connected to the first screw barrel 3022. The connecting head 3081 below is rotatably connected to the rotating shaft screw 3023. An annular groove 301 is provided on the outer wall of the end of the first connecting block 204 and the outer wall of the second connecting block 207. The two U-shaped seats 3021 are fixedly installed on the top walls of the two annular grooves 301 respectively. The top of the U-shaped seat 3021 is flush with the top wall of the first connecting block 204, which is convenient for the disassembly of the first connecting block 204. The distance between the two U-shaped seats 3021 is smaller than the distance between the two rotating seats 3066, so that the two rotating pressing members 308 are arranged in a V shape, and the support plate 3 07 is in contact with the top wall of the second connecting block 207, the end face of the suction cup 3092 is in contact with the surface of the flow channel wall plate 1, the position of the fixed plate 305 is determined, and the two clamping cylinders 3083 at the bottom of the lower plate 3061 are connected to the first connecting block 204 and the second connecting block 207 respectively, so that the two clamping cylinders 3083 form a V-shape, and the lower plate 3061 moves downward, so that the first spring 3086 is continuously compressed, which produces pressure on the first connecting block 204 and the second connecting block 207 to approach each other, and makes the detection head 203 close to the inner wall of the second mounting groove 202 to avoid air leakage, and at the same time makes the front measuring hole 205 and the rear measuring hole 208 tightly connected to improve the detection stability.

[0038] The negative pressure fixing member 309 includes a negative pressure tube 3091 which is equidistantly installed on the fixed plate 305 near the flow channel wall plate 1. A suction cup 3092 is fixedly installed at the end of the negative pressure tube 3091. The end surface of the suction cup 3092 contacts the surface of the flow channel wall plate 1. A movable groove 3093 is provided inside the fixed plate 305. The movable groove 3093 is connected to each negative pressure tube 3091. A movable plate 3095 is movably installed inside the movable groove 3093. A piston 3097 is movably installed inside the negative pressure tube 3091. A connecting rod 3098 is fixedly installed between the piston 3097 and the movable plate 3095. A sliding groove 3094 is provided at the bottom end of the movable groove 3093. The sliding groove 3094 runs through the bottom end of the fixed plate 305. A connecting rod 3098 is provided between the movable plate 3095 and the downward moving plate 3061. 96. The two ends of the connecting rod 3096 are hinged to the movable plate 3095 and the lower plate 3061 respectively. The connecting rod 3096 is located on the inner side of the slide groove 3094. The lower plate 3061 moves downward and pulls the piston 3097 to move away from the suction cup 3092 through the connecting rod 3096. The detection head 203 limits one end of the first connecting block 204. When the lower plate 3061 moves downward, the piston 3097 is pulled in the negative pressure tube 3091 toward the fixed plate 305 through the connecting rod 3096, so that negative pressure is generated between the suction cup 3092 and the flow channel wall panel 1, thereby fixing the fixed plate 305 and limiting the other end of the first connecting block 204 at the same time, thereby improving the installation stability of the first connecting block 204 in the first mounting groove 201 and improving the detection stability.

[0039] The clamping fixture 310 includes side rods 3101 symmetrically mounted on both sides of the lower moving plate 3061, first vertical plates 3102 are fixedly mounted on the ends of the side rods 3101, two first vertical plates 3102 are symmetrically arranged on both sides of the first connecting block 204, a third clamping groove 3103 is opened on the first vertical plate 3102, second vertical plates 3104 are symmetrically mounted on the bottom end of the fixing plate 305, the two second vertical plates 3104 are respectively located on the side away from each other of the two first vertical plates 3102, a side tube 3105 is fixedly mounted on the side of the second vertical plate 3104 away from the first connecting block 204, and the side A clamping rod 3106 is movably installed inside the cylinder 3105, one end of the clamping rod 3106 penetrates to the side of the second vertical plate 3104 close to the first vertical plate 3102, and one end of the clamping rod 3106 contacts the first vertical plate 3102, the other end of the clamping rod 3106 is fixedly installed with a second spring 3107, and the other end of the clamping rod 3106 is fixedly installed with a pull rod 3108, the second connecting block 207 is symmetrically provided with a first clamping groove 303 on both sides, the first connecting block 204 is symmetrically provided with a second clamping groove 304 on both sides, the first clamping groove 303, the second clamping groove 304 and the clamping rod 3106 are symmetrically provided with a first clamping groove 303, a second clamping groove 304 and a clamping rod 3106. 06 The three are coaxially arranged. When the lower moving plate 3061 moves downward to drive the third slot 3103 to move to a coaxial position with the first slot 303, the clamping rod 3106 passes through the third slot 3103 and the second slot 304 under the action of the second spring 3107 and is clamped into the first slot 303. When the first connecting block 204 and the second connecting block 207 are pressed tightly, the first slot 303 and the second slot 304 are coaxially arranged. When the lower moving plate 3061 moves, the first spring 3086 is compressed, so that the first slot 303 and the second slot 304 are pressed tightly. 02 As the lower plate 3061 moves downward until the third slot 3103 is coaxial with the first slot 303, the clamping rod 3106, under the elastic force of the second spring 3107, passes through the third slot 3103 and the second slot 304 and is clamped into the first slot 303, thereby clamping and fixing the lower plate 3061, the first connecting block 204 and the second connecting block 207, and fixing the first connecting block 204 and the second connecting block 207, so that the first connecting block 204, the second connecting block 207 and the flow channel wall plate 1 are tightly connected, thereby improving the measurement stability.

[0040] Working principle: When working, first insert the first connection block 204 into the second installation groove 202, so that the detection head 203 enters the first installation groove 201, and then install the second connection block 207 inside the end groove 206 at the end of the first connection block 204, so that the U-shaped seat 3021 on the first connection block 204 and the U-shaped seat 3021 on the second connection block 207 are both at the top of the annular groove 301, and set a fixing plate 305 above the first connection block 204, so that the support plate 307 at the bottom end of the fixing plate 305 contacts the top wall of the first connection block 204, and the cross section of the suction cup 3092 contacts the surface of the flow channel wall plate 1, and then install it;

[0041] Pull the connectors 3081 at the bottom ends of the two compression cylinders 3083 to the inside of the two U-shaped seats 3021 respectively, and then screw the rotating shaft screw 3023 into the first screw cylinder 3022 on the two U-shaped seats 3021, so that the rotating shaft screw 3023 is inserted into the rotating groove 3082 on the connector 3081, and the installation is completed, so that the two compression cylinders 3083 are arranged in a V shape;

[0042] The pressing screw 3063 is then screwed. Since the pressing screw 3063 is threadedly connected to the second screw barrel 3062, the pressing screw 3063 moves downward, thereby pushing the lower plate 3061 to move downward. When the lower plate 3061 moves toward the first connecting block 204, the pressing rod 3084 is pushed toward the lower connecting head 3081, so that the first spring 3086 is continuously compressed. The pressing barrel 3083 connected to the first connecting block 204 is pressed toward the second connecting block under the elastic force of the first spring 3086. The pressure on the side of 207 makes the detection head 203 closely attached to the inner wall of the second installation groove 202, avoiding air leakage during the detection process and improving the measurement effect. The pressing cylinder 3083 connected to the second connection block 207 generates pressure on the second connection block 207 toward the side of the first connection block 204 under the elastic force of the first spring 3086, so that the end of the second connection block 207 is closely attached to the inner wall of the end groove 206 in the first connection block 204, ensuring the tightness of the connection between the front measurement hole 205 and the rear measurement hole 208, and improving the detection stability.

[0043] When the lower moving plate 3061 moves downward, the piston 3097 is pulled by the connecting rod 3096 to move inside the negative pressure tube 3091 toward the fixed plate 305, so that negative pressure is generated between the suction cup 3092 and the flow channel wall plate 1, so that the fixed plate 305 and the flow channel wall plate 1 are fixed by negative pressure adsorption, thereby positioning the lower moving plate 3061, so that after the first connecting block 204 and the second connecting block 207 are connected, they are limited under the action of the detection head 203 and the fixed plate 305, thereby improving the measurement stability;

[0044] When the lower moving plate 3061 moves downward a certain distance, the first spring 3086 is continuously compressed, and the first connecting block 204 and the second connecting block 207 are pressed against each other under the elastic force of the first spring 3086. When being pressed, the first clamping groove 303 and the second clamping groove 304 move to a coaxial position, and at the same time, the first vertical plate 3102 moves downward with the lower moving plate 3061 until the third clamping groove 3103, the first clamping groove 303 and the second clamping groove 304 are coaxial. At this time, the clamping rod 3106 passes through the third clamping groove 3103 and the second clamping groove 304 under the elastic force of the second spring 3107 and is clamped into the first clamping groove 303, thereby clamping and fixing the lower moving plate 3061, the first connecting block 204 and the second connecting block 207, so that the first connecting block 204, the second connecting block 207 and the flow channel wall plate 1 are tightly connected, thereby improving the measurement stability.

[0045] After installation, a pressure sensor is connected to one end of the connecting pipe 209 for detection.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A static pressure measuring device for a wind tunnel, comprising a flow channel wall plate (1), characterized in that: The flow channel wall plate (1) is provided with a static pressure detection component (2); The static pressure detection component (2) comprises a first installation groove (201) formed on a flow channel wall plate (1); a second installation groove (202) is formed at one end of the first installation groove (201); the second installation groove (202) extends through the other side surface of the flow channel wall plate (1); the inner diameter of the first installation groove (201) is larger than the inner diameter of the second installation groove (202); a detection head (203) is installed inside the first installation groove (201); a first connecting block (204) is installed on one side of the detection head (203); the first connecting block (204) is located inside the second installation groove (202); an end groove (206) is formed at one end of the first connecting block (204) away from the detection head (203); the end groove (206) is installed inside A second connection block (207) is installed, a front measuring hole (205) is provided inside the first connection block (204), a rear measuring hole (208) is provided inside the second connection block (207), a connection pipe (209) is installed at one end of the second connection block (207) away from the detection head (203), the other end of the connection pipe (209) is used to connect to a pressure sensor, the front measuring hole (205), the rear measuring hole (208) and the connection pipe (209) are coaxially arranged and have the same inner diameter, a clamping installation assembly (3) is installed between the first connection block (204) and the second connection block (207), and the clamping installation assembly (3) is used to clamp and fix the first connection block (204) and the second connection block (207); The clamping and mounting assembly (3) comprises a fixing plate (305) arranged above the first connecting block (204), a supporting plate (307) being installed at the bottom end of the fixing plate (305), the supporting plate (307) being in contact with the top wall of the first connecting block (204), and a downwardly movable clamping member (306) being installed on the fixing plate (305); The downward moving pressing member (306) comprises a downward moving plate (3061) arranged below the fixed plate (305); two rotating seats (3066) are symmetrically installed at the bottom end of the downward moving plate (3061); a rotating pressing member (308) is installed on the rotating seat (3066); the two rotating pressing members (308) generate a pressure to press the first connecting block (204) and the second connecting block (207) against each other; a negative pressure fixing member (309) for fixing the fixing plate (305) is installed between the fixed plate (305) and the flow channel wall plate (1); and clamping fixing members (310) are installed on both sides of the downward moving plate (3061); the clamping fixing members (310) are used to clamp the downward moving plate (3061), the first connecting block (204) and the second connecting block (207); A limit rotating sleeve (3064) is fixedly installed on the top of the downward moving plate (3061), a clamping screw (3063) is provided above the downward moving plate (3061), the bottom end of the clamping screw (3063) is fixedly installed on the limit rotating block (3065), the limit rotating block (3065) is rotatably installed inside the limit rotating sleeve (3064), a second screw barrel (3062) is installed on the fixed plate (305), and the clamping screw (3063) is threadedly installed inside the second screw barrel (3062); The rotating pressing member (308) comprises two connecting heads (3081), the connecting heads (3081) are provided with rotating grooves (3082), a pressing cylinder (3083) is installed on the lower connecting head (3081), a pressing block (3085) is movably installed inside the pressing cylinder (3083), a pressing rod (3084) is fixedly installed between the pressing block (3085) and the upper connecting head (3081), a first spring (3086) is symmetrically installed on the side of the pressing block (3085) away from the pressing rod (3084), one end of the first spring (3086) is fixedly connected to the inner wall of the end of the pressing cylinder (3083), the upper connecting head (3081) is rotatably connected to the rotating shaft on the rotating seat (3066), and the lower connecting head (3081) is connected to the fixed connecting member (302); The fixed connection member (302) comprises a U-shaped seat (3021), a first screw barrel (3022) is mounted on the side wall of the U-shaped seat (3021), a rotating shaft screw (3023) is arranged on the inner side of the U-shaped seat (3021), the rotating shaft screw (3023) is threadedly connected to the first screw barrel (3022), a connecting head (3081) at the bottom is rotatably connected to the rotating shaft screw (3023), and an end outer wall of the first connection block (204) and a second connection block (208) are connected to the fixed connection member (3021). 07) are provided with an annular groove (301), and two U-shaped seats (3021) are respectively fixedly installed on the top walls of the two annular grooves (301), and the top of the U-shaped seat (3021) is flush with the top wall of the first connecting block (204), so as to facilitate the disassembly of the first connecting block (204), and the distance between the two U-shaped seats (3021) is smaller than the distance between the two rotating seats (3066), so that the two rotating pressing members (308) are arranged in a V shape; The negative pressure fixing member (309) comprises a negative pressure tube (3091) equidistantly mounted on a side of the fixing plate (305) close to the flow channel wall plate (1); a suction cup (3092) is fixedly mounted on the end of the negative pressure tube (3091); the end surface of the suction cup (3092) contacts the surface of the flow channel wall plate (1); a movable groove (3093) is provided inside the fixing plate (305); the movable groove (3093) is connected to each negative pressure tube (3091); a movable plate (3095) is movably mounted inside the movable groove (3093); a piston (3097) is movably mounted inside the negative pressure tube (3091); and a connecting rod (3098) is fixedly mounted between the piston (3097) and the movable plate (3095); A slide groove (3094) is provided at the bottom end of the movable groove (3093), and the slide groove (3094) extends to the bottom end of the fixed plate (305). A connecting rod (3096) is provided between the movable plate (3095) and the lower moving plate (3061), and the two ends of the connecting rod (3096) are respectively hinged to the movable plate (3095) and the lower moving plate (3061), and the connecting rod (3096) is located on the inner side of the slide groove (3094). When the lower moving plate (3061) moves downward, the piston (3097) is pulled by the connecting rod (3096) to move toward the side away from the suction cup (3092); The clamping fixing member (310) comprises side rods (3101) symmetrically mounted on both sides of the downward moving plate (3061); first vertical plates (3102) are fixedly mounted on the ends of the side rods (3101); the two first vertical plates (3102) are symmetrically arranged on both sides of the first connecting block (204); a third clamping groove (3103) is provided on the first vertical plate (3102); second vertical plates (3104) are symmetrically mounted on the bottom end of the fixed plate (305); the two second vertical plates (3104) are respectively located on the sides of the two first vertical plates (3102) that are away from each other. A side tube (3105) is fixedly installed on a side of the second vertical plate (3104) away from the first connecting block (204), a clamping rod (3106) is movably installed inside the side tube (3105), one end of the clamping rod (3106) passes through a side of the second vertical plate (3104) close to the first vertical plate (3102), and one end of the clamping rod (3106) is in contact with the first vertical plate (3102), a second spring (3107) is fixedly installed on the other end of the clamping rod (3106), and a pull rod (3108) is fixedly installed on the other end of the clamping rod (3106); The second connecting block (207) is symmetrically provided with a first card slot (303) on both sides, and the first connecting block (204) is symmetrically provided with a second card slot (304) on both sides. The first card slot (303), the second card slot (304) and the card rod (3106) are coaxially arranged. When the downward moving plate (3061) moves downward to drive the third card slot (3103) to move to a position coaxial with the first card slot (303), the card rod (3106) passes through the third card slot (3103) and the second card slot (304) under the action of the second spring (3107) and is carded into the first card slot (303).

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