CN116358655A

CN116358655A - High-repeatability gas Roots flowmeter

Info

Publication number: CN116358655A
Application number: CN202310202510.6A
Authority: CN
Inventors: 秦卫良; 王丹丹; 谢用文
Original assignee: Fujian Had Instrument Co ltd
Current assignee: Fujian Had Instrument Co ltd
Priority date: 2023-03-06
Filing date: 2023-03-06
Publication date: 2023-06-30

Abstract

The invention discloses a gas Roots flowmeter with high repeatability, which comprises a flowmeter body, wherein a protective cover is detachably arranged on an outer cover of the flowmeter body, a rotating shaft is rotatably connected to the inner wall of the flowmeter body, a waist wheel is arranged on the rotating shaft, a connecting piece is arranged on the rotating shaft, and the connecting piece is used for fixing the relative position relationship between the rotating shaft and the waist wheel. The utility model has the advantages of protection casing and flowmeter body can be convenient dismantlement, the effect of being convenient for revise not hard up between pivot and the waist wheel.

Description

High-repeatability gas Roots flowmeter

Technical Field

The application relates to the technical field of flowmeters, in particular to a gas Roots flowmeter with high repeatability.

Background

Roots flowmeter is also called as Roots flowmeter, and is mainly used for high-precision measuring instrument for continuously or intermittently measuring gas flow in closed pipeline. The Roots flowmeter has the characteristics of high precision, good reliability, light weight, long service life, low operation noise, convenient installation and use and the like, can be used for indicating accumulated flow, instantaneous flow, single quantity and the like on site, and can also be used for outputting pulse signals, 4-20mA or 1-5V analog signals, 485 communication, 4-20mA+HART, MODBUS protocols and the like.

The working principle of the Roots flowmeter is as follows: the gas is continuously divided into single known volume parts by using a mechanical measuring element, the total volume of the flow is measured according to the times that the volume part of the fluid is filled and discharged in sequence and repeatedly, the gas is continuously discharged out of the flowmeter through the measuring chamber along with the rotation of the waist wheel through the waist wheel exchange driving rotation. The volume of the air discharged from each revolution of the waist wheel is a fixed value, namely the discharge amount is in direct proportion to the revolution of the waist wheel shaft, and the revolution times are transmitted to the calculation display part after being decelerated through the waist wheel shaft and other transmission mechanisms.

Aiming at the related technology, the Roots flowmeter has higher sensitivity to gas, so that the waist wheel and the rotating shaft are in stress and force application states continuously, namely, the rotating shaft and the waist wheel are easy to loosen, so that the Roots flowmeter has poor precision, and the rotating shaft or the waist wheel needs to be adjusted or maintained.

Disclosure of Invention

An object of the invention is to provide a new technical solution for a gas Roots flowmeter.

According to the first aspect of the invention, a high-repeatability gas Roots flowmeter is provided, which comprises a flowmeter body, wherein a protective cover is detachably arranged on the outer cover of the flowmeter body, a rotating shaft is rotatably connected to the inner wall of the flowmeter body, a waist wheel is arranged on the rotating shaft, a connecting piece is arranged on the rotating shaft, and the connecting piece is used for fixing the relative position relationship between the rotating shaft and the waist wheel.

Through adopting above-mentioned technical scheme, appear not hard up back between waist wheel and pivot, can pull down the protection casing to debug waist wheel, pivot and connecting piece, reduce the error of flowmeter, make the flowmeter can be lasting, accurate measuring and calculating the flow.

Preferably, the mounting groove has been seted up on the flowmeter body, be equipped with the installation piece on the protecting cover, the installation groove is annular setting, the installation groove is used for supplying the installation piece gomphosis, it is equipped with the butt board to slide on the installation piece, the butt board is used for with the inboard wall butt of installation groove, be equipped with the drive assembly who is used for driving butt board removal on the flowmeter body.

Through adopting above-mentioned technical scheme, when installing the protection casing, with installation piece and mounting groove gomphosis, rethread drive assembly makes the butt board remove, realizes the butt of butt board and mounting groove inner wall tightly, has further improved the connection stability between protection casing and the flowmeter body, makes the flowmeter can accurately measure. When the protective cover is disassembled, the abutting plate is driven by the driving assembly to be separated from the inner wall of the mounting groove, and then the mounting block is separated from the mounting groove, so that the protective cover and the flowmeter body can be conveniently separated.

Preferably, the drive assembly includes actuating lever, intermediate lever and connecting rod, actuating lever and connecting rod all slide and set up on the installation piece, the one end and the connecting rod rotation of intermediate lever are connected, the other end and the actuating lever rotation of intermediate lever are connected, the actuating lever is the arc setting, the one end and the butt board that the intermediate lever was kept away from to the connecting rod link to each other, be equipped with the catch bar on the mounting groove inner wall, the catch bar is used for with the actuating lever butt to make the actuating lever remove.

Through adopting above-mentioned technical scheme, during the installation protection casing, after installation piece and the gomphosis of mounting groove, rotate the protection casing for actuating lever and catch bar butt, actuating lever slide towards installation piece center, drive the middle pole and rotate, the connecting rod is kept away from installation piece center and slides, and then promotes butt board and mounting groove inner wall butt, realizes further fixing installation piece and mounting groove.

Preferably, the surface of the abutting plate is a rough surface.

Through adopting above-mentioned technical scheme, improved the frictional force between butt board and the mounting groove inner wall, reduced the possibility of taking place the displacement between installation piece and the mounting groove.

Preferably, a positioning groove is formed in the inner wall of the mounting groove, a positioning block is arranged on the mounting block in a sliding mode, the positioning groove is used for enabling the positioning block to slide, a first elastic piece is connected to the mounting block and used for driving the positioning block to be embedded with the positioning groove, a guide surface is arranged on the positioning block, and the guide surface is used for guiding the positioning block to slide away from the positioning groove.

Through adopting above-mentioned technical scheme, when installing the protection casing, with locating piece and constant head tank alignment, the locating piece slides along the constant head tank until installation piece and constant head tank bottom surface butt, rotates the protection casing, and the guide surface is butt with the constant head tank side, under the direction effect of guide surface, the locating piece slides into the installation piece, and the installation piece of being convenient for smoothly slides in the constant head tank for operating personnel can confirm the relative position relation between actuating lever and the catch bar, has improved the installation convenience between safety cover and the flowmeter body.

Preferably, the mounting block is provided with a mounting hole, the flowmeter body is provided with a fixing bolt, the mounting hole is used for being in threaded connection with the fixing bolt, the driving assembly further comprises a separating rod, a separating rope and a magnetic piece, the separating rod is movably arranged in the mounting hole, the magnetic piece is connected with the separating rod, the magnetic piece is used for attracting the fixing bolt, one end of the separating rope is connected with the separating rod, and the other end of the separating rope is connected with the driving rod.

Through adopting above-mentioned technical scheme, under the cooperation of fixing bolt and mounting hole, further fixed the protection casing. When the protective cover needs to be disassembled, the fixing bolt is rotated, the separating rod synchronously rotates under the attraction of the magnetic piece, the separating rod is wound in the rotating process, the driving rod is driven to further slide towards the center of the mounting block, the middle rod is driven to rotate towards the inclination by the horizontal direction, the connecting rod and the abutting plate are driven to slide towards the center of the mounting block, the abutting of the abutting plate on the inner wall of the mounting groove is relieved, the protective cover can be directly separated from the flowmeter body, and the protective cover is convenient to disassemble.

Preferably, the separating rod is provided with a locking block, the mounting block is provided with a sliding groove and a locking groove, the extending direction of the sliding groove is parallel to the moving direction of the fixing bolt, the sliding groove and the locking groove are both used for sliding connection of the locking block, and the locking groove is an annular groove.

Through adopting above-mentioned technical scheme, fixing bolt and mounting hole in-process of separation drive the release lever and rotate, because the latch segment slides along the groove that slides, the release lever slides along the groove that slides earlier, aligns when latch segment and latch slot, and fixing bolt can drive the release lever and rotate, under the gomphosis cooperation in latch segment and latch slot, and fixing bolt and magnetic part separate, can be steadily take off fixing bolt, with protection casing and flowmeter quick separation again.

Preferably, the mounting block is provided with a second elastic piece, and the second elastic piece is used for pushing the driving rod to slide towards the pushing rod.

Through adopting above-mentioned technical scheme, after installation piece and the separation of mounting groove, stir the release lever for the locking piece slides towards the installation piece center along the groove that slides, and under the elasticity of second elastic component, the installation piece center is kept away from again to the actuating lever slides, until the roll-off installation piece, is convenient for install the protection casing once more.

Preferably, the mounting block is provided with a clamping jaw, the clamping jaw comprises a clamping plate and a third elastic piece which are oppositely arranged, and two ends of the third elastic piece are respectively connected with the clamping plate which is oppositely arranged.

Through adopting above-mentioned technical scheme, at the in-process of actuating lever and push rod butt, the clamping jaw presss from both sides tightly the catch bar, has further improved the gomphosis effect between installation piece and the mounting groove.

Preferably, the clamping plate is provided with a pushing plate in a sliding manner, the pushing plate is close to or far away from the installation block to slide, the pushing plate is connected with a moving rope, and one end of the moving rope far away from the pushing plate is connected with the separating rod.

Through adopting above-mentioned technical scheme, when dismantling the protection casing, under the drive of release lever, the push pedal slides towards the installation piece center, and the third elastic component stretches for splint open, release the clamping jaw to the centre gripping of push rod, the installation piece of being convenient for separates with the mounting groove.

According to an embodiment of the present disclosure, when installing the protection casing, with installation piece and mounting groove gomphosis, rethread drive assembly makes the butt board remove, realizes the butt of butt board and mounting groove inner wall tightly, has further improved the connection stability between protection casing and the flowmeter body, makes the flowmeter can accurately measure. When the protective cover needs to be disassembled, the fixing bolt is rotated, the separating rod synchronously rotates under the attraction of the magnetic piece, the separating rod is wound in the rotating process, the driving rod is driven to further slide towards the center of the mounting block, the middle rod is driven to rotate towards the inclination by the horizontal direction, the connecting rod and the abutting plate are driven to slide towards the center of the mounting block, the abutting of the abutting plate on the inner wall of the mounting groove is relieved, the protective cover can be directly separated from the flowmeter body, and the protective cover is convenient to disassemble.

Other features of the present invention and its advantages will become apparent from the following detailed description of exemplary embodiments of the invention, which proceeds with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic overall structure of an embodiment of the present application.

Fig. 2 is a schematic view showing the lumbar wheel in the present application.

Fig. 3 is a schematic diagram showing a mounting block in the present application.

Fig. 4 is a schematic view showing the driving lever in the present application.

Fig. 5 is a schematic view showing a separation rope in the present application.

Fig. 6 is a schematic view showing a locking groove in the present application.

Reference numerals illustrate: 1. a flowmeter body; 11. a mounting groove; 111. a positioning groove; 2. a protective cover; 3. waist wheel; 4. a rotating shaft; 5. a connecting piece; 6. a fixing assembly; 61. a mounting block; 611. a mounting hole; 612. a positioning block; 6121. a guide surface; 613. a first elastic member; 614. a locking groove; 615. a slip groove; 62. a fixing bolt; 63. an abutting plate; 7. a drive assembly; 71. a driving rod; 72. an intermediate lever; 73. a connecting rod; 74. a separation rod; 741. a locking block; 75. a separation rope; 76. a magnetic member; 8. a clamping jaw; 81. a clamping plate; 82. a third elastic member; 83. a push plate; 84. a moving rope; 9. a second elastic member; 10. pushing the rod.

Description of the embodiments

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless it is specifically stated otherwise.

The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.

It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

Referring to fig. 1, 2 and 3, a gas roots flowmeter with high repeatability comprises a flowmeter body 1, a protective cover 2, a waist wheel 3, a rotating shaft 4 and a connecting piece 5, wherein the protective cover 2 is detachably connected to the flowmeter body 1, and a fixing component 6 is arranged on the flowmeter body 1 for improving the detachment convenience of the protective cover 2. The rotating shaft 4 is rotationally connected to the flowmeter body 1, the waist wheel 3 is sleeved on the rotating shaft 4, a connecting piece 5 is arranged on the rotating shaft 4, the connecting piece 5 is used for fixing the relative position relationship between the rotating shaft 4 and the waist wheel 3, the connecting piece 5 is a connecting block in the embodiment, and the connecting block is sleeved on the rotating shaft 4 and is abutted against the waist wheel 3. After the transmission between the connecting block and the waist wheel 3 and the rotating shaft 4 is loosened, the connection between the protective cover 2 and the flowmeter body 1 can be released through the fixing component 6, and the position relationship between the rotating shaft 4 and the waist wheel 3 can be conveniently adjusted.

Referring to fig. 3 and 4, the fixing assembly 6 includes a plurality of mounting blocks 61, fixing bolts 62 and abutting plates 63, the mounting blocks 61 are fixed on the protective cover 2, the mounting blocks 61 in this embodiment are arranged in a circumferential array with the center of the protective cover 2 as the center of the circle, a gap exists between adjacent mounting blocks 61, a mounting groove 11 is formed in the flowmeter body 1, and the mounting groove 11 is used for the mounting blocks 61 to be embedded. The abutting plate 63 is slidably arranged on the mounting block 61, the abutting plate 63 slides along the radial direction of the circumference of the mounting groove 11, and the mounting block 61 is provided with a driving assembly 7 for driving the abutting plate 63 to slide. The surface of the abutting plate 63 is a rough surface, friction force between the abutting plate 63 and the inner wall of the mounting groove 11 is increased, and the abutting plate 63 can be similar to and attached to the inner wall curvature of the mounting groove 11. When the mounting block 61 is fitted into the mounting groove 11, the positional relationship between the mounting block 61 and the mounting groove 11 is further fixed by the abutting action of the abutting plate 63. The fixing bolt 62 is in threaded connection with the mounting block 61 and the flowmeter body 1, and the mounting block 61 can be fixed again through the fixing bolt 62, so that the protecting cover 2 can be firmly fixed on the flowmeter body 1, namely, the waist wheel 3 can stably rotate, and the flowmeter can stably measure.

Referring to fig. 4 and 5, the driving assembly 7 includes a driving rod 71, an intermediate rod 72 and a connecting rod 73, the driving rod 71 and the connecting rod 73 are slidably disposed on the mounting block 61, the sliding directions of the driving rod 71 and the connecting rod 73 are mutually perpendicular, the driving rod 71 slides along the circumferential direction of the mounting groove 11, one end of the intermediate rod 72 is hinged with the connecting rod 73, the other end of the intermediate rod 72 is hinged with the driving rod 71, the driving rod 71 is in an arc-shaped arrangement, one end of the connecting rod 73, which is far away from the intermediate rod 72, is connected with the abutting plate 63, a pushing rod 10 is disposed on the inner wall of the mounting groove 11, the pushing rod 10 extends along the depth direction of the mounting groove 11, and the pushing rod 10 is used for abutting with the driving rod 71 and moving the driving rod 71.

Referring to fig. 4 and 5, the mounting block 61 is further provided with a clamping jaw 8, the clamping jaw 8 is composed of two clamping plates 81 and a third elastic member 82 which are oppositely arranged, two ends of the third elastic member 82 are respectively fixed with the two clamping plates 81, and the clamping jaw 8 can clamp the push rod 10.

When the protective cover 2 is installed, the installation block 61 is embedded with the installation groove 11, the protective cover 2 is rotated, the driving rod 71 is abutted with the pushing rod 10, the driving rod 71 slides towards the center of the installation block 61, the middle rod 72 is driven to rotate, the connecting rod 73 slides away from the center of the installation block 61, the abutting plate 63 is pushed to abut against the inner wall of the installation groove 11, the fixing bolt 62 is in threaded connection with the installation hole 611, the connection stability between the protective cover 2 and the flowmeter body 1 is further improved, and the flowmeter can accurately measure. In the process of abutting the driving rod 71 and the push rod, the clamping jaw 8 abuts against the push rod 10 and clamps the push rod 10, so that the relative position relationship between the mounting block 61 and the push rod 10 is fixed, and the embedding effect between the mounting block 61 and the mounting groove 11 is further improved.

Referring to fig. 3 and 4, in order to precisely position the position relationship of the push rod 10, a positioning block 612 is slidably disposed on the mounting block 61, a sliding direction of the positioning block 612 is parallel to a sliding direction of the abutting plate 63, a positioning groove 111 is formed on an inner wall of the mounting groove 11, an extending direction of the positioning groove 111 is parallel to a depth direction of the mounting groove 11, the positioning groove 111 is used for sliding the positioning block 612, a first elastic member 613 is connected to the mounting block 61, and the first elastic member 613 is used for driving the positioning block 612 to be engaged with the positioning groove 111, and the first elastic member 613 is a spring in this embodiment. The positioning block 612 is also provided with a guide surface 6121, the guide surface 6121 is arranged in an arc shape, and the guide surface 6121 is used for guiding the positioning block 612 to slide away from the positioning groove 111.

When the protective cover 2 is installed, the positioning block 612 is aligned with the positioning groove 111, the positioning block 612 slides along the positioning groove 111 until the installation block 61 is abutted with the bottom surface of the installation groove 11, the protective cover 2 is rotated, the guide surface 6121 is abutted with the side edge of the positioning groove 111, and under the guide action of the guide surface 6121, the positioning block 612 slides into the installation block 61, so that the installation block 61 can slide in the installation groove 11 smoothly, an operator can determine the relative position relationship between the driving rod 71 and the pushing rod 10, and the installation convenience between the protective cover and the flowmeter body 1 is improved.

Referring to fig. 5 and 6, the driving assembly 7 further includes a separation rod 74, a separation rope 75, and a magnetic member 76, wherein the separation rod 74 is movably disposed in the mounting hole 611, the magnetic member 76 is connected to the separation rod 74, the magnetic member 76 is used for attracting the fixing bolt 62, the magnetic member 76 is a magnet in this embodiment, one end of the separation rope 75 is connected to the separation rod 74, and the other end of the separation rope 75 is connected to the driving rod 71. The separating rod 74 is provided with a locking block 741, the mounting block 61 is provided with a sliding groove 615 and a locking groove 614, the extending direction of the sliding groove 615 is parallel to the moving direction of the fixing bolt 62, the sliding groove 615 and the locking groove 614 are both used for sliding connection of the locking block 741, and the locking groove 614 is an annular groove.

Referring to fig. 4 and 5, a push plate 83 is slidably provided on the clamping plate 81, the push plate 83 slides toward or away from the mounting block 61, the push plate 83 is connected with a moving rope 84, and one end of the moving rope 84 away from the push plate 83 is connected with the separation lever 74.

When the protective cover 2 needs to be detached, the fixing bolt 62 is rotated, the separating rod 74 rotates synchronously under the attraction of the magnetic piece 76, and the separating rod 74 slides along the sliding groove 615 due to the sliding of the locking block 741, so that the separating rod 74 slides along the extending direction driven by the sliding groove 615, and the separating rope 75 and the moving rope 84 are pulled. When the locking block 741 is aligned with the locking groove 614, the fixing bolt 62 can drive the separating rod 74 to rotate, and under the fitting cooperation of the locking block 741 and the locking groove 614, the fixing bolt 62 slides away from the magnetic member 76 and separates under the action of the screw thread, the fixing bolt 62 can be removed, and the position relationship of the separating rod 74 is fixed. The driving rod 71 further slides towards the center of the mounting block 61 under the driving of the separation rope 75, drives the middle rod 72 to rotate obliquely from the horizontal direction, further drives the connecting rod 73 and the abutting plate 63 to slide towards the center of the mounting block 61, and releases the abutting of the abutting plate 63 to the inner wall of the mounting groove 11. Driven by the moving rope 84, the push plate 83 slides towards the mounting block 61, so that the clamping plate 81 rotates relatively away from the mounting block, and the clamping and fixing of the clamping jaw 8 to the push rod 10 are released. The protective cover 2 can be stably and quickly separated from the flowmeter, and the protective cover 2 is easy and convenient to detach.

Referring to fig. 4 and 5, the mounting block 61 is provided with a second elastic member 9, and the second elastic member 9 is used to push the driving lever 71 to slide toward the push lever 10. The second elastic member 9 is a spring in this embodiment. When the shield 2 needs to be mounted again, the separation lever 74 is rotated so that the locking block 741 is aligned with the sliding groove 615, and the driving lever 71 slides again away from the center of the mounting block 61 until sliding out of the mounting block 61 under the elastic force of the second elastic member 9. Under the elastic force of the third elastic member 82, the push plate 83 slides away from the mounting block 61, and the clamping jaw 8 can clamp the push rod 10 again.

The implementation principle of the gas Roots flowmeter with high repeatability in the embodiment of the application is as follows: when the protective cover 2 is installed, the installation block 61 is embedded with the installation groove 11, the abutting plate 63 is moved through the driving assembly 7, the abutting of the abutting plate 63 and the inner wall of the installation groove 11 is realized, the connection stability between the protective cover 2 and the flowmeter body 1 is further improved, and the flowmeter can accurately measure. When the protection cover 2 needs to be disassembled, the fixing bolt 62 is rotated, under the attraction of the magnetic piece 76, the separation rod 74 synchronously rotates, the separation rod 74 rolls up the separation rope 75 in the rotation process, the driving rod 71 is driven to further slide towards the center of the installation block 61, the middle rod 72 is driven to rotate towards the inclination by the horizontal direction, the connecting rod 73 and the abutting plate 63 are driven to slide towards the center of the installation block 61, the abutting of the abutting plate 63 to the inner wall of the installation groove 11 is relieved, the protection cover 2 can be directly separated from the flowmeter body 1, and the protection cover 2 is convenient to disassemble.

While certain specific embodiments of the invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A highly repeatable gas roots flowmeter, characterized by: including flowmeter body (1), flowmeter body (1) dustcoat can be dismantled and be equipped with protection casing (2), rotate on flowmeter body (1) inner wall and be connected with pivot (4), be equipped with waist wheel (3) on pivot (4), be equipped with connecting piece (5) on pivot (4), connecting piece (5) are used for fixed relative positional relationship between pivot (4) and waist wheel (3).

2. The high repeatability gas roots flowmeter of claim 1, wherein: the utility model discloses a flowmeter, including flowmeter body (1), mounting groove (11) have been seted up on flowmeter body (1), be equipped with installation piece (61) on protection casing (2), installation groove (11) are the annular setting, installation groove (11) are used for supplying installation piece (61) gomphosis, it is equipped with butt board (63) to slide on installation piece (61), butt board (63) are used for with installation groove (11) inner wall butt, be equipped with on flowmeter body (1) and be used for driving drive assembly (7) that butt board (63) removed.

3. The high repeatability gas roots flowmeter of claim 2, wherein: the driving assembly (7) comprises a driving rod (71), a middle rod (72) and a connecting rod (73), wherein the driving rod (71) and the connecting rod (73) are both arranged on the mounting block (61) in a sliding mode, one end of the middle rod (72) is rotationally connected with the connecting rod (73), the other end of the middle rod (72) is rotationally connected with the driving rod (71), the driving rod (71) is in an arc-shaped mode, one end, far away from the middle rod (72), of the connecting rod (73) is connected with the abutting plate (63), a pushing rod (10) is arranged on the inner wall of the mounting groove (11), and the pushing rod (10) is used for being abutted to the driving rod (71) and enabling the driving rod (71) to move.

4. A highly repeatable gas roots meter according to claim 3, wherein: the surface of the abutting plate (63) is a rough surface.

5. The high repeatability gas roots flowmeter of claim 2, wherein: set up constant head tank (111) on mounting groove (11) inner wall, it is equipped with locating piece (612) to slide on mounting block (61), constant head tank (111) are used for supplying locating piece (612) to slide, be connected with first elastic component (613) on mounting block (61), first elastic component (613) are used for driving locating piece (612) and gomphosis of constant head tank (111), be equipped with guide surface (6121) on locating piece (612), guide surface (6121) are used for guiding locating piece (612) to keep away from constant head tank (111) and slide.

6. The high repeatability gas roots flowmeter of claim 2, wherein: the utility model discloses a flowmeter, including installation piece (61), flowmeter body (1) and drive assembly (7), install hole (611) have been seted up on installation piece (61), be equipped with fixing bolt (62) on flowmeter body (1), install hole (611) are used for supplying fixing bolt (62) threaded connection, drive assembly (7) still include release lever (74), release rope (75) and magnetic part (76), release lever (74) activity sets up in install hole (611), magnetic part (76) link to each other with release lever (74), magnetic part (76) are used for attracting fixing bolt (62), the one end and the release lever (74) of release rope (75) link to each other, the other end and the drive lever (71) of release rope (75) link to each other.

7. The high repeatability gas roots flowmeter of claim 6, wherein: the separating rod (74) is provided with a locking block (741), the mounting block (61) is provided with a sliding groove (615) and a locking groove (614), the extending direction of the sliding groove (615) is parallel to the moving direction of the fixing bolt (62), the sliding groove (615) and the locking groove (614) are both used for sliding connection of the locking block (741), and the locking groove (614) is an annular groove.

8. The high repeatability gas roots flowmeter of claim 6, wherein: the mounting block (61) is provided with a second elastic piece (9), and the second elastic piece (9) is used for pushing the driving rod (71) to slide towards the pushing rod (10).

9. The high repeatability gas roots flowmeter of claim 6, wherein: the clamping jaw (8) is arranged on the mounting block (61), the clamping jaw (8) comprises clamping plates (81) and third elastic pieces (82) which are oppositely arranged, and two ends of each third elastic piece (82) are respectively connected with the corresponding clamping plates (81).

10. The high repeatability gas roots flowmeter of claim 9, wherein: the movable clamp is characterized in that a push plate (83) is arranged on the clamp plate (81) in a sliding mode, the push plate (83) is close to or far away from the mounting block (61) and slides, the push plate (83) is connected with a movable rope (84), and one end, far away from the push plate (83), of the movable rope (84) is connected with the separating rod (74).