Pressure transmitter for fluid pipeline

Abstract

The invention belongs to the technical field of electronic measuring instruments, and particularly relates to a pressure transmitter for a fluid pipeline. Comprising a strain gauge arranged in a shell, a liquid inlet channel is formed in the shell, a miniature electric control valve is installed on the shell, and a rotating part is arranged on an output shaft of the miniature electric control valve; the rotating part is provided with a communicating hole, a first through hole and a second through hole, elastic rings are fixedly connected in the first through hole and the second through hole, and the elastic rings are fixedly connected with sliding pieces. Liquid pressure is buffered through deformation of the elastic ring and sliding of the sliding piece, when the liquid pressure is close to the pressure limit capable of being borne by the strain gauge, the pressure borne by the strain gauge is reduced, the liquid pressure in the fluid pipeline is calculated by combining the elastic coefficient of the elastic ring and the liquid pressure borne by the strain gauge, and the liquid pressure in the fluid pipeline is calculated. While the damage probability of the strain gauges is reduced, the amplitude of the pressure monitored by the strain gauges is increased, and then the application range of the device is widened.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electronic measuring instruments, and particularly to a pressure transmitter for fluid pipeline. BACKGROUND

[0002] In the field of industrial fluid control, the pressure transmitter is the core equipment for monitoring the fluid pressure of the pipeline. The traditional pressure transmitter usually uses a metal strain gauge as a sensitive element. Its working principle is that the fluid pressure acts on the surface of the strain gauge, causing the strain gauge to deform. After the strain gauge deforms, its resistance value changes. The pressure value is converted through the resistance value change. However, the measurement range of a single strain gauge is limited by the physical limit of the material, which limits the amplitude of the liquid pressure that the strain gauge can measure. When the pipeline pressure exceeds the elastic deformation threshold, it will cause permanent deformation of the strain gauge and even damage, thereby affecting the accuracy of the liquid pressure monitoring result. SUMMARY

[0003] In order to overcome the shortcomings pointed out in the background art, the present application provides a pressure transmitter for fluid pipeline.

[0004] Technical scheme: A pressure transmitter for fluid pipeline, comprising a strain gauge arranged in a housing, a liquid inlet channel is arranged in the housing, the strain gauge is located in the liquid inlet channel, a micro electro-control valve is mounted on the housing, a rotating part is arranged on the output shaft of the micro electro-control valve, and an arc-shaped groove is arranged in the housing and is symmetrically distributed and communicates with the liquid inlet channel. The rotating part is provided with a communication hole, a first through hole and a second through hole, each of which is used to communicate with the liquid inlet channel, an elastic ring is fixedly connected in each of the first through hole and the second through hole, a sliding sheet is fixedly connected to the elastic ring, the sliding sheet is used to extrude the adjacent elastic ring, a pressure relief plate is sealingly and slidably connected to the housing, and a pressure relief assembly is arranged on the housing to adjust the moving distance of the pressure relief plate.

[0005] In addition, it is particularly preferred that a gap exists between the sliding sheet and the rotating part.

[0006] In addition, it is particularly preferred that the rotating part is provided with a cavity, and the communication hole, the first through hole, the second through hole and the liquid inlet channel all communicate with the cavity.

[0007] In addition, it is particularly preferred that the housing is provided with a plurality of plugging parts which are symmetrically distributed and are used to plug the communication hole, the first through hole and the second through hole.

[0008] In addition, it is particularly preferred that a shielding cover is arranged in each of the first through hole and the second through hole, and the shielding cover is used to extrude the adjacent sliding sheet.

[0009] In addition, it is particularly preferred that the elastic coefficient of the elastic ring in the first through hole is smaller than the elastic coefficient of the elastic ring in the second through hole.

[0010] In addition, it is particularly preferred that the pressure relief assembly comprises an outer sleeve, the outer sleeve is rotationally connected to the shell, a sliding rod is arranged in the outer sleeve and is slidingly connected to the shell, and an elastic member is fixedly connected between the sliding rod and the pressure relief plate, and the sliding rod is used to press the pressure relief plate through the elastic member.

[0011] In addition, it is particularly preferred that the outer sleeve is slidingly connected to the sliding rod, the outer sleeve is provided with a first limiting groove and a second limiting groove, and a limiting pin is fixedly connected to the sliding rod, and the first limiting groove and the second limiting groove are used to guide the limiting pin.

[0012] In addition, it is particularly preferred that the output shaft of the micro electric control valve is transmitted through a gear set between the outer sleeve.

[0013] In addition, it is particularly preferred that the first limiting groove and the second limiting groove are both V-shaped, and the maximum distance between the second limiting groove and the pressure relief plate is greater than the maximum distance between the first limiting groove and the pressure relief plate.

[0014] The present application has the following advantages: the present application buffers the liquid pressure through the deformation of the elastic ring and the sliding of the sliding piece, reduces the pressure on the strain piece when the liquid pressure approaches the pressure limit that the strain piece can withstand, and calculates the liquid pressure in the fluid pipeline by combining the elastic coefficient of the elastic ring and the liquid pressure that the strain piece can withstand, thereby reducing the probability of damage to the strain piece, increasing the amplitude of the pressure that the strain piece can monitor, improving the application range of the device, reducing the probability of damage to the strain piece, improving the accuracy of the pressure monitoring result under high liquid pressure, and limiting the maximum pressure of the liquid in the upper part of the liquid inlet channel when the elastic ring in the second through hole deforms to the limit state, thereby reducing the probability of damage to the strain piece caused by excessive pressure. During the rotation of the rotating part, the sliding rod adjusts the extrusion force on the elastic member, changes the liquid pressure in the liquid inlet channel generated by the pressure relief plate, so that the greater the liquid pressure in the liquid inlet channel, the stronger the pressure relief effect of the pressure relief plate, thereby reducing the probability of damage to the strain piece caused by excessive liquid pressure during long-term use. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic view of the three-dimensional structure of the present application; Figure 2 is a sectional view of the three-dimensional structure of the shell of the present application; Figure 3 is a schematic view of the three-dimensional structure of the rotating part of the present application; Figure 4 A perspective view of the sliding piece of the present application; Figure 5 A perspective view of the rotating part of the present application; Figure 6 A perspective view of the outer sleeve of the present application; Figure 7 An exploded view of the outer sleeve and the sliding rod of the present application.

[0016] In the figure: 1, the shell, 101, the liquid inlet channel, 2, the strain gauge, 3, the micro electric control valve, 301, the rotating part, 302, the arc-shaped slot, 4, the communication hole, 5, the first through hole, 6, the second through hole, 7, the elastic ring, 8, the sliding piece, 801, the pressure relief plate, 9, the chamber, 10, the blocking part, 11, the shielding cover, 13, the outer sleeve, 1301, the first limiting slot, 1302, the second limiting slot, 14, the sliding rod, 1401, the limiting pin. DETAILED DESCRIPTION

[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those of ordinary skill in the art without any creative work fall within the protection scope of the present application.

[0018] Embodiment 1 The present embodiment discloses a pressure transmitter for fluid pipeline, which is used for monitoring the pressure in the fluid pipeline and expanding the amplitude of the monitorable pressure.

[0019] As Figures 1-5As shown, the strain gauge 2 is arranged in the shell 1, the electronic components in the shell 1 are of the prior structure and not shown in the figure, the shell 1 is externally provided with a control terminal which is not shown in the figure, the strain gauge 2 is electrically connected with the control terminal, the electronic components in the shell 1 are electrically connected with the control terminal, the shell 1 is provided with a liquid inlet channel 101, the strain gauge 2 is located in the liquid inlet channel 101, in use, the lower part of the shell 1 is threadedly connected to a fluid pipeline, so that the liquid inlet channel 101 is communicated with the fluid pipeline, the liquid in the fluid pipeline contacts the strain gauge 2 through the liquid inlet channel 101, the liquid pressure in the fluid pipeline causes the strain gauge 2 to be pressed and deformed, the resistance value of the strain gauge 2 changes, the change of the resistance value of the strain gauge 2 is obtained by the control terminal, so as to monitor the liquid pressure in the fluid pipeline, the shell 1 is provided with a micro electric control valve 3 which is electrically connected with the control terminal, the micro electric control valve 3 is provided with a rotating part 301 on the output shaft, the output shaft of the micro electric control valve 3 is used to drive the rotating part 301 to rotate, the rotating part 301 is located in the liquid inlet channel 101 and divides the liquid inlet channel 101 into upper and lower two parts, the shell 1 is provided with arc-shaped grooves 302 which are symmetrically distributed and all communicated with the liquid inlet channel 101. Figure 1 The direction of the right view is the rotation reference, after the rotating part 301 rotates clockwise, the first through hole 5 gradually rotates to be communicated with the liquid inlet channel 101, if the rotating part 301 continues to rotate clockwise, the second through hole 6 gradually rotates to be communicated with the liquid inlet channel 101, the elastic rings 7 are fixedly connected in the first through hole 5 and the second through hole 6, the elastic rings 7 are fixedly connected with the sliding pieces 8, there is a gap between the sliding pieces 8 and the rotating part 301, so as to reduce the probability that the moving resistance of the sliding pieces 8 changes due to friction, the sliding pieces 8 are used to press the adjacent elastic rings 7, when the sliding pieces 8 are subjected to the liquid pressure, the sliding pieces 8 press the adjacent elastic rings 7, at this time, the elastic rings 7 are deformed, the shell 1 is sealingly and slidably connected with the pressure relief plate 801, the shell 1 is provided with a pressure relief assembly which is used to adjust the moving distance of the pressure relief plate 801.

[0020] As shown in the figure, Figure 3 As shown in the figure, Figure 6 As shown, the pressure relief gradually includes an outer sleeve 13, the outer sleeve 13 is rotationally connected to the shell 1, the outer sleeve 13 is provided with a sliding rod 14 which is slidably connected with the shell 1, when the outer sleeve 13 rotates, the sliding rod 14 horizontally slides, the elastic members are fixedly connected between the sliding rod 14 and the pressure relief plate 801, the elastic members are compression springs, when the sliding rod 14 horizontally slides, the elastic members between the sliding rod 14 and the pressure relief plate 801 are released, so as to reduce the resistance which the pressure relief plate 801 suffers when sliding to the right.

[0021] As shown in the figure,Figure 3 and Figure 4 As shown, the rotating part 301 is provided with a chamber 9 , and the communicating hole 4 , the first through hole 5 , the second through hole 6 and the liquid inlet channel 101 are all connected to the chamber 9 .

[0022] like Figure 4 As shown, the housing 1 is provided with sealing parts 10 which are symmetrically distributed front to back and are used to seal the connecting hole 4, the first through hole 5 and the second through hole 6. When the connecting hole 4, the first through hole 5 or the second through hole 6 rotates to the adjacent sealing part 10, the sealing part 10 seals the connecting hole 4, the first through hole 5 or the second through hole 6.

[0023] like Figure 4 and Figure 5 As shown, a shielding cover 11 is provided in each of the first through hole 5 and the second through hole 6. The shielding cover 11 is a stretchable metal cover. Both sides of the shielding cover 11 are fixedly connected to the rotating part 301 and the adjacent sliding piece 8 respectively. Initially, the shielding cover 11 is in a contracted state. When the sliding piece 8 is impacted by the liquid, the sliding piece 8 squeezes the adjacent elastic ring 7, and the shielding cover 11 is stretched, so that the position between the sliding piece 8 and the rotating part 301 is covered by the adjacent elastic ring 7 and the adjacent shielding cover 11, thereby protecting the position between the sliding piece 8 and the rotating part 301. The elastic coefficient of the elastic ring 7 in the first through hole 5 is smaller than the elastic coefficient of the elastic ring 7 in the second through hole 6, so that the two sliding pieces 8 are subjected to different resistance when sliding.

[0024] The specific working principle is as follows: When the operator needs to use this device to monitor the liquid pressure in the fluid pipeline, the lower part of the shell 1 is threadedly connected to the fluid pipeline to connect the liquid inlet channel 101 to the fluid pipeline. The liquid in the fluid pipeline passes through the lower part of the liquid inlet channel 101, the chamber 9, the connecting hole 4 and the upper part of the liquid inlet channel 101 and contacts the strain gauge 2. The liquid pressure in the fluid pipeline causes the strain gauge 2 to be compressed and deformed, and the resistance value of the strain gauge 2 changes. The strain gauge 2 transmits the resistance value signal to the control terminal, and the operator can know the change in the resistance value of the strain gauge 2 through the control terminal.

[0025] In the process of using the device, if the strain gauge 2 monitors that the liquid pressure in the liquid pipeline approaches the limit that it can bear, the control terminal controls the micro electro-control valve 3 to open, the output shaft of the micro electro-control valve 3 drives the rotating part 301 to rotate clockwise, initially, the first through hole 5 communicates with the liquid inlet channel 101 through the front arc-shaped groove 302, so that the pressure distribution of each part in the first through hole 5 is uniform, and the elastic ring 7 in the first through hole 5 does not deform, in the process of rotating the rotating part 301, the outer sleeve 13 rotates to drive the sliding rod 14 to slide horizontally, the elastic element between the sliding rod 14 and the pressure relief plate 801 is released, the resistance of the pressure relief plate 801 to slide to the right is reduced, the liquid on the upper part of the liquid inlet channel 101 extrudes the pressure relief plate 801 to move to the right, when the communication hole 4 is no longer aligned with the liquid inlet channel 101, and the first through hole 5 moves to be blocked by the front blocking part 10, the upper part of the liquid inlet channel 101 is blocked, the pressure relief plate 801 moves to the right to relieve the liquid on the upper part of the liquid inlet channel 101, so that the liquid pressure in the upper part of the liquid inlet channel 101 is reduced to the normal state, when the first through hole 5 rotates to communicate with the upper part of the liquid inlet channel 101, the liquid enters the chamber 9 through the lower part of the liquid inlet channel 101, passes through the chamber 9 and enters the first through hole 5, so that the pressure difference is generated on the upper and lower sides of the sliding piece 8 in the first through hole 5, the elastic ring 7 in the first through hole 5 starts to deform, and the sliding piece 8 in the first through hole 5 slides and extrudes the elastic ring 7 to deform, so as to buffer the liquid pressure.

[0026] In the process of using the device, if the liquid pressure in the liquid pipeline is monitored by the strain gauge 2 again close to the limit that it can withstand after the elastic ring 7 in the first through hole 5 buffers the liquid pressure, the control terminal controls the output shaft of the micro electro-control valve 3 to drive the rotating part 301 to continue to rotate clockwise. Initially, the second through hole 6 is in communication with the liquid inlet channel 101 through the arc-shaped groove 302, so that the pressure distribution of each part in the second through hole 6 is uniform, and the elastic ring 7 in the second through hole 6 does not deform. With the rotation of the rotating part 301, the first through hole 5 is rotated to be partially misaligned with the liquid inlet channel 101, the first through hole 5 is rotated to be in communication with the liquid inlet channel 101 through the arc-shaped groove 302, there is no longer a pressure difference on the upper and lower sides of the elastic ring 7 in the first through hole 5, and the second through hole 6 moves to be blocked by the front blocking part 10. The upper half of the liquid inlet channel 101 is blocked, the pressure relief plate 801 moves to the right to relieve the liquid in the upper part of the liquid inlet channel 101, so that the liquid pressure in the upper part of the liquid inlet channel 101 returns to the normal state. When the second through hole 6 is rotated to be in communication with the upper part of the liquid inlet channel 101, the second through hole 6 is no longer in communication with the liquid inlet channel 101 through the arc-shaped groove 302. The liquid enters the chamber 9 through the lower part of the liquid inlet channel 101, passes through the chamber 9 and enters the second through hole 6, the liquid extrudes the sliding sheet 8 in the second through hole 6, the sliding sheet 8 in the second through hole 6 slides and extrudes the adjacent elastic ring 7, the sliding sheet 8 extrudes the liquid in the upper part of the liquid inlet channel 101, and the liquid pressure is buffered through the deformation of the elastic ring 7 and the sliding of the sliding sheet 8, so as to reduce the pressure borne by the strain gauge 2. Whether the pressure borne by the strain gauge 2 is buffered can be known by observing whether the micro electro-control valve 3 is opened, and then the elastic coefficient of the elastic ring 7 is predicted in advance. Combined with the sliding resistance of the sliding sheet 8 (i.e. the elastic coefficient of the elastic ring 7) and the liquid pressure borne by the strain gauge 2, the liquid pressure in the fluid pipeline is calculated, the amplitude of the pressure that can be monitored by the device is increased, and the application range of the device is further improved.

[0027] In the process of the liquid flowing through the second through hole 6, the sliding sheet 8 in the second through hole 6 slides and extrudes the elastic ring 7 to deform. When the elastic ring 7 in the second through hole 6 deforms to the limit state, the sliding sheet 8 is blocked and cannot move upward, limiting the limit pressure of the liquid in the upper part of the liquid inlet channel 101, so as to reduce the probability of damage of the strain gauge 2 due to excessive pressure.

[0028] In the process of the sliding of the sliding sheet 8, the elastic ring 7 deforms and the shielding cover 11 is elongated. The elastic ring 7 and the shielding cover 11 cover the slidable range of the sliding sheet 8, so as to reduce the probability of the first through hole 5 and the second through hole 6 contacting the liquid in the fluid pipeline.

[0029] When the liquid pressure in the fluid pipeline recovers to the range that the strain gauge 2 can withstand, the control terminal controls the output shaft of the micro-electrically controlled valve 3 to drive the rotating part 301 to rotate and reset until the connecting hole 4 rotates to connect with the liquid inlet channel 101. The liquid in the fluid pipeline passes through the lower part of the liquid inlet channel 101, the chamber 9, the connecting hole 4 and the upper part of the liquid inlet channel 101 and contacts the strain gauge 2. The control terminal closes the micro-electrically controlled valve 3 to reset the device.

[0030] Example 2 This embodiment discloses a pressure transmitter for a fluid pipeline, which is a further improvement on the basis of the first embodiment.

[0031] like Figure 7 As shown, the outer sleeve 13 is slidably connected to the sliding rod 14, and the outer sleeve 13 is provided with a first limit groove 1301 and a second limit groove 1302. If the outer sleeve 13 rotates clockwise, the limit pin 1401 is guided by the first limit groove 1301 and the second limit groove 1302. When the outer sleeve 13 rotates counterclockwise to reset, the limit pin 1401 is guided in the opposite direction by the second limit groove 1302 and the first limit groove 1301. The sliding rod 14 is fixedly connected to the limit pin 1401. The first limit groove 1301 and the second limit groove 1302 are both used to guide the limit pin 1401. The limit pin 1401 is initially located at the right rear part of the first limit groove 1301.

[0032] like Figure 3 and Figure 4As shown, the output shaft of the micro electro-controlled valve 3 and the outer sleeve 13 are connected through a gear set, wherein the gear set is composed of three vertical straight gears, the lower straight gear is fixedly connected with the output shaft of the micro electro-controlled valve 3, the upper straight gear is fixedly connected with the outer sleeve 13, and the middle straight gear is rotatably connected with the shell 1. The first limiting groove 1301 and the second limiting groove 1302 are respectively located on the front and rear sides of the axis of the outer sleeve 13, and both of them are V-shaped. The maximum distance between the second limiting groove 1302 and the relief plate 801 is greater than the maximum distance between the first limiting groove 1301 and the relief plate 801, so that the distance that the limiting pin 1401 moves rightward along the second limiting groove 1302 is greater than the distance that the limiting pin 1401 moves rightward along the first limiting groove 1301. The limiting pin 1401 first moves leftward along the first limiting groove 1301 and then moves rightward. When the limiting pin 1401 moves leftward, the communication hole 4 is in communication with the liquid inlet channel 101. When the limiting pin 1401 moves rightward, the communication hole 4 loses the communication with the liquid inlet channel 101. When the limiting pin 1401 moves leftward along the second limiting groove 1302, the first through hole 5 rotates to be in communication with the liquid inlet channel 101. When the limiting pin 1401 moves rightward along the second limiting groove 1302, the first through hole 5 rotates to lose the communication with the liquid inlet channel 101. When the liquid inlet channel 101 is blocked, the limiting pin 1401 moves rightward again, and even if the sliding rod 14 moves rightward, the elastic member is stretched, the relief plate 801 moves rightward and relieves the liquid pressure in the liquid inlet channel 101, so that the liquid pressure in the liquid inlet channel 101 is reduced to the normal state.

[0033] During the rotation of the rotating part 301, the distance that the limiting pin 1401 drives the sliding rod 14 to move rightward is adjusted through the first limiting groove 1301 and the second limiting groove 1302, so as to adjust the extrusion force of the sliding rod 14 on the elastic member, change the resistance of the relief plate 801 to the liquid in the liquid inlet channel 101, and the greater the liquid pressure in the liquid inlet channel 101, the stronger the relief effect of the relief plate 801. During the switching of the positions of the communication hole 4, the first through hole 5 and the second through hole 6, the liquid pressure of the upper part of the liquid inlet channel 101 is zeroed.

[0034] When the liquid pressure in the fluid pipeline returns to the range that the strain gauge 2 can withstand, the control terminal controls the output shaft of the micro electro-controlled valve 3 to drive the rotating part 301 to rotate counterclockwise to reset, until the communication hole 4 rotates to be in communication with the liquid inlet channel 101, and then the liquid in the fluid pipeline passes through the lower part of the liquid inlet channel 101, the chamber 9, the communication hole 4 and the upper part of the liquid inlet channel 101 and contacts the strain gauge 2. The control terminal closes the micro electro-controlled valve 3, so that the device resets.

[0035] The above merely illustrates the embodiments of the present application, and is not intended to limit the present application. Any equivalent replacements made within the principles of the present application shall fall within the scope of the present application. The contents not described in detail in the present application are the prior art known to the person skilled in the art.

Claims

1. A pressure transmitter for a fluid pipeline, comprising a strain gauge (2) arranged in a housing (1), wherein a liquid inlet channel (101) is provided in the housing (1), and the strain gauge (2) is located in the liquid inlet channel (101), wherein the strain gauge (2) is located in the liquid inlet channel (101), and wherein: The housing (1) is equipped with a micro-electrically controlled valve (3), an output shaft of the micro-electrically controlled valve (3) is provided with a rotating portion (301), and the housing (1) is provided with symmetrically distributed arc-shaped grooves (302) that are all in communication with the liquid inlet channel (101); The rotating portion (301) is provided with a communicating hole (4), a first through hole (5) and a second through hole (6) all for communicating with the liquid inlet channel (101); elastic rings (7) are fixedly connected in the first through hole (5) and the second through hole (6); the elastic rings (7) are fixedly connected with sliding sheets (8); the sliding sheets (8) are used to squeeze adjacent elastic rings (7); the housing (1) is sealingly and slidingly connected with a pressure relief plate (801); the housing (1) is provided with a pressure relief assembly for adjusting the moving distance of the pressure relief plate (801).

2. A pressure transmitter for a fluid pipeline according to claim 1, characterized in that: There is a gap between the sliding sheet (8) and the rotating part (301).

3. A pressure transmitter for a fluid pipeline according to claim 2, characterized in that: The rotating portion (301) is provided with a chamber (9), and the communicating hole (4), the first through hole (5), the second through hole (6) and the liquid inlet channel (101) are all in communication with the chamber (9).

4. A pressure transmitter for a fluid pipeline according to claim 3, characterized in that: The housing (1) is provided with symmetrically distributed blocking portions (10) each used to block the communicating hole (4), the first through hole (5) and the second through hole (6).

5. A pressure transmitter for a fluid pipeline according to claim 4, characterized in that: A shielding cover (11) is provided in each of the first through hole (5) and the second through hole (6), and the shielding cover (11) is used to squeeze the adjacent sliding sheet (8).

6. A pressure transmitter for a fluid pipeline according to claim 5, characterized in that: The elastic coefficient of the elastic ring (7) in the first through hole (5) is smaller than the elastic coefficient of the elastic ring (7) in the second through hole (6).

7. The pressure transmitter for a fluid pipeline according to claim 1, characterized in that: The pressure relief assembly includes an outer sleeve (13), the outer sleeve (13) is rotatably connected to the outer shell (1), a sliding rod (14) is provided in the outer sleeve (13) and is slidably connected to the outer shell (1), an elastic member is fixed between the sliding rod (14) and the pressure relief plate (801), and the sliding rod (14) is used to squeeze the pressure relief plate (801) through its elastic member.

8. The pressure transmitter for a fluid pipeline according to claim 7, characterized in that: The outer sleeve (13) is slidably connected to the sliding rod (14), and the outer sleeve (13) is provided with a first limiting groove (1301) and a second limiting groove (1302). The sliding rod (14) is fixedly connected to a limiting pin (1401), and the first limiting groove (1301) and the second limiting groove (1302) are both used to guide the limiting pin (1401).

9. The pressure transmitter for a fluid pipeline according to claim 8, characterized in that: The output shaft of the micro electric control valve (3) and the outer sleeve (13) are driven by a gear set.

10. The pressure transmitter for a fluid pipeline according to claim 8, characterized in that: The first limiting groove (1301) and the second limiting groove (1302) are both V-shaped, and the maximum distance between the second limiting groove (1302) and the pressure relief plate (801) is greater than the maximum distance between the first limiting groove (1301) and the pressure relief plate (801).

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