Micro differential pressure transmitter with pressure relief function

Abstract

The utility model discloses a micro differential pressure transmitter with a pressure relief function, and relates to the technical field of micro differential pressure transmitters. The device comprises a shell, wherein a pressure relief mechanism, a reset mechanism, a limiting mechanism, a connecting mechanism and a pressure measuring mechanism are arranged on the shell; the pressure relief mechanism comprises a first input port and a second input port which are formed in the shell, a connecting cavity is formed between the first input port and the second input port, a connecting channel is formed between the first input port and the second input port, and an air relief hole is formed between the connecting channel and the second input port. A sliding groove is formed between the air leakage hole and the connecting cavity, a sliding block is installed on the inner wall of the sliding groove in a sliding mode, and a ventilation hole is formed in the sliding block. According to the utility model, through the arrangement of the pressure relief mechanism, when the pressure difference of media in the first input port and the second input port is large, pressure relief can be carried out on the interior of the transmitter, and the problem that parts in the device are damaged due to too high pressure is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro differential pressure transmitters, in particular to a micro differential pressure transmitter with a pressure relief function. Background Art

[0002] In the prior art, after searching, it was found that a Chinese patent disclosed a "micro differential pressure transmitter" with an application number of "CN202120952203.6". This patent mainly states that when the balancing diaphragm is impacted by gas, the sleeve can reduce the swing range of the balancing diaphragm by limiting the range of motion of the balancing spring, and can reduce the swing of the balancing diaphragm, improve the measurement accuracy, and reduce the damage of the balancing diaphragm due to excessive swing amplitude. The gap between the relative sleeves can be adjusted, so that the sleeve can adjust the range of motion of the balancing diaphragm, and then adjust the pressure measurement range.

[0003] However, in the process of detecting the pressure difference, if the pressure difference between the two input ends is too large, for example, the pressure at one end is very high and the pressure at the other end is very low, this may cause the balance spring to be displaced too much. Excessive displacement will bring great stress to the balance spring and its surrounding internal parts. If this continues for a long time, it is likely to cause deformation or damage to the balance spring and parts, especially when the temperature and humidity of the sensor working environment are relatively harsh, the stress impact will be even greater. Utility Model Content

[0004] The utility model aims to provide a micro differential pressure transmitter with a pressure relief function. By providing a pressure relief mechanism, if the pressure difference between the medium inside the first input port and the medium inside the second input port is large, the pressure inside the transmitter can be relieved, thereby solving the problem that if the pressure difference between the two input ends is too large, the balance spring and parts may be deformed or damaged.

[0005] In order to solve the above technical problems, the utility model is realized by the following technical solutions:

[0006] The utility model is a micro differential pressure transmitter with a pressure relief function, comprising a housing, on which a pressure relief mechanism, a reset mechanism, a limit mechanism, a connection mechanism and a pressure measuring mechanism are arranged;

[0007] The pressure relief mechanism includes a first input port and a second input port opened inside the shell, a connecting cavity is opened inside the shell, a connecting cavity is opened between the first input port and the second input port, a connecting channel is opened between the first input port and the second input port, an air leakage hole is opened between the connecting channel and the second input port, a slide groove is opened between the air leakage hole and the connecting cavity, the slide groove extends to the bottom surface of the shell, a slider is slidably installed on the inner wall of the slide groove, a vent hole is opened on the slider, and the caliber of the vent hole is the same as that of the air leakage hole.

[0008] Furthermore, the reset mechanism includes a sliding rod fixedly mounted on the bottom surface of the slider, a first sealing sleeve fixedly mounted on the bottom surface of the outer shell, the bottom end of the sliding rod extends to the outside of the first sealing sleeve, the sliding rod is slidably connected to the first sealing sleeve, a gasket is fixedly mounted on the bottom end of the sliding rod, a first spring is sleeved on the sliding rod, the top end of the first spring is fixedly connected to the bottom surface of the slider, and the bottom end of the first spring is fixedly connected to the inner wall of the first sealing sleeve.

[0009] Furthermore, the limiting mechanism comprises a rotating shaft fixedly mounted on the bottom surface of the first sealing sleeve, a blocking piece is rotatably mounted on the bottom end of the rotating shaft, and the top surface of the blocking piece is in contact with the bottom surface of the gasket.

[0010] Furthermore, the connecting mechanism includes two elastic diaphragms fixedly mounted on the inner wall of the connecting cavity, the inner wall of the connecting cavity is completely fitted with the outer wall of the elastic diaphragm, and a second sealing sleeve is fixedly mounted on the top surface of the outer shell, and the bottom end of the second sealing sleeve extends to the interior of the connecting cavity.

[0011] Further, the pressure measuring mechanism includes a piston slidably mounted on the inner wall of the second sealing sleeve, a detection rod is fixedly mounted on the top surface of the piston, the top end of the detection rod extends to the outside of the second sealing sleeve, the detection rod is slidably connected to the second sealing sleeve, a second spring is sleeved on the detection rod, the bottom end of the second spring is fixedly mounted on the top surface of the piston, the top end of the second spring is fixedly connected to the inner wall of the second sealing sleeve, and a detection block is fixedly mounted on the top end of the detection rod.

[0012] Furthermore, the shell is provided with a plurality of mounting holes.

[0013] The utility model has the following beneficial effects:

[0014] 1. By providing a pressure relief mechanism, when gas or liquid is input into the first input port and the second input port respectively, if the pressure difference between the medium inside the first input port and the medium inside the second input port is large, a strong air pressure will be generated inside the connecting cavity, and the extrusion slider will move downward. When the vent hole on the slider moves to the vent hole, the medium inside the first input port can communicate with the medium inside the second input port, and the pressure inside the two ports offset each other, so that the pressure inside the transmitter can be relieved, effectively avoiding the problem of damage to the internal parts of the device due to excessive pressure.

[0015] 2. By providing a pressure measuring mechanism, the piston and the second sealing sleeve cooperate with each other. After the pressure inside the connecting cavity increases, the piston and the second spring will be driven to move upward. At this time, the pressure difference between the first input port and the second input port can be judged according to the rising height of the second spring, which is convenient for detection. At the same time, after the pressure difference is detected, due to the reset effect of the second spring, the piston slowly descends to reset, which is convenient for detection.

[0016] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is a schematic diagram of the overall structure of a micro differential pressure transmitter with a pressure relief function according to the utility model;

[0019] Figure 2 It is a front cross-sectional structural schematic diagram of a micro differential pressure transmitter with a pressure relief function according to the utility model;

[0020] Figure 3 This is a structural schematic diagram of a pressure measuring mechanism of a micro differential pressure transmitter with a pressure relief function according to the utility model;

[0021] Figure 4 It is a schematic diagram of a top view cross-sectional structure of a micro differential pressure transmitter with a pressure relief function according to the utility model;

[0022] Figure 5 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0023] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0024] 1. Shell; 2. Pressure relief mechanism; 3. Reset mechanism; 4. Limit mechanism; 5. Connecting mechanism; 6. Pressure measuring mechanism; 7. Mounting hole; 21. First input port; 22. Second input port; 23. Connecting channel; 24. Air relief hole; 25. Slide groove; 26. Slider; 27. Air vent; 31. Slide rod; 32. Gasket; 33. First spring; 34. First sealing sleeve; 41. Rotating shaft; 42. Blocking piece; 51. Connecting cavity; 52. Elastic diaphragm; 53. Second sealing sleeve; 61. Piston; 62. Detection rod; 63. Second spring; 64. Detection block. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-5 As shown, the utility model is a micro differential pressure transmitter with a pressure relief function, comprising a housing 1, on which a pressure relief mechanism 2, a reset mechanism 3, a limit mechanism 4, a connection mechanism 5 and a pressure measuring mechanism 6 are arranged;

[0027] The pressure relief mechanism 2 includes a first input port 21 and a second input port 22 opened inside the shell 1, a connecting cavity 51 is opened between the first input port 21 and the second input port 22, a connecting channel 23 is opened between the first input port 21 and the second input port 22, a venting hole 24 is opened between the connecting channel 23 and the second input port 22, a slide groove 25 is opened between the venting hole 24 and the connecting cavity 51, the slide groove 25 extends to the bottom surface of the shell 1, a slider 26 is slidably installed on the inner wall of the slide groove 25, a venting hole 27 is opened on the slider 26, and the caliber of the venting hole 27 is the same as that of the venting hole 24.

[0028] Among them Figure 2 and Figure 5 As shown, the reset mechanism 3 includes a slide rod 31 fixedly mounted on the bottom surface of the slider 26, a first sealing sleeve 34 is fixedly mounted on the bottom surface of the housing 1, the bottom end of the slide rod 31 extends to the outside of the first sealing sleeve 34, the slide rod 31 is slidably connected to the first sealing sleeve 34, a gasket 32 ​​is fixedly mounted on the bottom end of the slide rod 31, a first spring 33 is sleeved on the slide rod 31, the top end of the first spring 33 is fixedly connected to the bottom surface of the slider 26, and the bottom end of the first spring 33 is fixedly connected to the inner wall of the first sealing sleeve 34.

[0029] By providing the reset mechanism 3, the slide rod 31 cooperates with the first spring 33. When the internal air pressure of the first input port 21 and the second input port 22 is in a balanced state, the first spring 33 will reset and drive the slide block 26 to move upward until the top surface of the slide block 26 abuts against the inner top wall of the slide groove 25, which has a certain reset effect.

[0030] Among them Figure 2 and Figure 5 As shown, the limiting mechanism 4 includes a rotating shaft 41 fixedly mounted on the bottom surface of the first sealing sleeve 34 , a blocking piece 42 is rotatably mounted on the bottom end of the rotating shaft 41 , and the top surface of the blocking piece 42 contacts the bottom surface of the gasket 32 ​​.

[0031] By setting a limiting mechanism 4, when it is necessary to relieve pressure inside the connecting cavity 51, the baffle 42 can be rotated so that the top surface of the baffle 42 is not in contact with the bottom surface of the gasket 32, so that the slider 26 can drive the slide rod 31 to move downward. When pressure relief is not required, the baffle 42 can be rotated so that the top surface of the baffle 42 is in contact with the bottom surface of the gasket 32, and at the same time, the top surface of the slider 26 is in contact with the inner wall of the slide groove 25 to prevent the slider 26 from moving up and down.

[0032] Among them Figure 3 and Figure 4 As shown, the connecting mechanism 5 includes two elastic diaphragms 52 fixedly mounted on the inner wall of the connecting cavity 51, the inner wall of the connecting cavity 51 is completely fitted with the outer wall of the elastic diaphragm 52, and a second sealing sleeve 53 is fixedly mounted on the top surface of the outer shell 1, and the bottom end of the second sealing sleeve 53 extends to the interior of the connecting cavity 51.

[0033] By providing a connecting mechanism 5, the two elastic diaphragms 52 cooperate with each other. When the pressure of the medium in the first input port 21 is greater than the pressure of the medium in the second input port 22 and a pressure difference is generated, the right elastic diaphragm 52 will bulge to the left. Since the elastic diaphragm 52 is completely in contact with the inner wall of the connecting cavity 51, the left elastic diaphragm 52 will be blocked by the inner wall of the connecting cavity 51 when bulging to the left and will not be deformed, thereby increasing the pressure inside the connecting cavity 51.

[0034] Among them Figure 3 As shown, the pressure measuring mechanism 6 includes a piston 61 slidably mounted on the inner wall of the second sealing sleeve 53, a detection rod 62 is fixedly mounted on the top surface of the piston 61, the top end of the detection rod 62 extends to the outside of the second sealing sleeve 53, the detection rod 62 is slidably connected to the second sealing sleeve 53, a second spring 63 is sleeved on the detection rod 62, the bottom end of the second spring 63 is fixedly mounted on the top surface of the piston 61, the top end of the second spring 63 is fixedly connected to the inner wall of the second sealing sleeve 53, and a detection block 64 is fixedly mounted on the top end of the detection rod 62.

[0035] By providing a pressure measuring mechanism 6, the piston 61 and the second sealing sleeve 53 cooperate with each other. After the pressure inside the connecting cavity 51 increases, the piston 61 and the second spring 63 will be driven to move upward. At this time, the pressure difference between the first input port 21 and the second input port 22 can be judged according to the rising height of the second spring 63, which is convenient for detection. At the same time, after the pressure difference is detected, due to the reset effect of the second spring 63, the piston 61 slowly descends to reset, which is convenient for detection.

[0036] Among them Figure 1 As shown, a plurality of mounting holes 7 are provided on the housing 1. By providing a plurality of mounting holes 7, the overall device is easy to install.

[0037] A specific application of this embodiment is: by providing the pressure relief mechanism 2, when gas or liquid is input into the first input port 21 and the second input port 22 respectively, if the pressure difference between the medium inside the first input port 21 and the medium inside the second input port 22 is large, a strong air pressure will be generated inside the connecting cavity 51, and the extrusion slider 26 will move downward. When the vent hole 27 on the slider 26 moves to the vent hole 24, the medium inside the first input port 21 can communicate with the medium inside the second input port 22, and the pressure inside the two ports offset each other, so that the pressure inside the transmitter can be relieved, effectively avoiding the problem of damage to the internal parts of the device due to excessive pressure;

[0038] By providing the reset mechanism 3, the slide bar 31 cooperates with the first spring 33. When the internal air pressure of the first input port 21 and the second input port 22 is in a balanced state, the first spring 33 will reset and drive the slide block 26 to move upward until the top surface of the slide block 26 abuts against the inner top wall of the slide groove 25, which has a certain reset effect.

[0039] By providing the limiting mechanism 4, when it is necessary to relieve the pressure inside the connecting cavity 51, the baffle 42 can be rotated so that the top surface of the baffle 42 does not contact the bottom surface of the gasket 32, so that the slider 26 can drive the slide bar 31 to move downward. When it is not necessary to relieve the pressure, the baffle 42 can be rotated so that the top surface of the baffle 42 contacts the bottom surface of the gasket 32, and at the same time, the top surface of the slider 26 contacts the inner top wall of the slide groove 25, so as to prevent the slider 26 from moving up and down.

[0040] By providing the connection mechanism 5, the two elastic diaphragms 52 cooperate with each other. When the pressure of the medium in the first input port 21 is greater than the pressure of the medium in the second input port 22, resulting in a pressure difference, the right elastic diaphragm 52 will bulge to the left. Since the elastic diaphragm 52 is completely in contact with the inner wall of the connection cavity 51, the left elastic diaphragm 52 will be blocked by the inner wall of the connection cavity 51 when bulging to the left, and will not be deformed, thereby increasing the pressure inside the connection cavity 51.

[0041] By providing the pressure measuring mechanism 6, the piston 61 cooperates with the second sealing sleeve 53. When the pressure inside the connection cavity 51 increases, the piston 61 and the second spring 63 are driven to move upward. At this time, the pressure difference between the first input port 21 and the second input port 22 can be judged according to the height of the second spring 63, which is convenient for detection. At the same time, after the pressure difference is detected, due to the reset effect of the second spring 63, the piston 61 slowly descends to reset, which is convenient for detection.

[0042] By providing a plurality of mounting holes 7, the overall device is easy to install.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A micro differential pressure transmitter with a pressure relief function, comprising a housing (1), characterized in that: The housing (1) is provided with a pressure relief mechanism (2), a reset mechanism (3), a limit mechanism (4), a connection mechanism (5) and a pressure measuring mechanism (6); The pressure relief mechanism (2) comprises a first input port (21) and a second input port (22) which are arranged inside the housing (1); a connecting cavity (51) is arranged between the first input port (21) and the second input port (22); a connecting channel (23) is arranged between the first input port (21) and the second input port (22); an air leakage hole (24) is arranged between the connecting channel (23) and the second input port (22); a sliding groove (25) is arranged between the air leakage hole (24) and the connecting cavity (51); the sliding groove (25) extends to the bottom surface of the housing (1); a slider (26) is slidably mounted on the inner wall of the sliding groove (25); a vent hole (27) is arranged on the slider (26); the caliber of the vent hole (27) is the same as the caliber of the air leakage hole (24).

2. A micro differential pressure transmitter with pressure relief function according to claim 1, characterized in that: The reset mechanism (3) comprises a slide bar (31) fixedly mounted on the bottom surface of the slider (26); a first sealing sleeve (34) is fixedly mounted on the bottom surface of the housing (1); the bottom end of the slide bar (31) extends to the outside of the first sealing sleeve (34); the slide bar (31) is slidably connected to the first sealing sleeve (34); a gasket (32) is fixedly mounted on the bottom end of the slide bar (31); a first spring (33) is sleeved on the slide bar (31); the top end of the first spring (33) is fixedly connected to the bottom surface of the slider (26); and the bottom end of the first spring (33) is fixedly connected to the inner wall of the first sealing sleeve (34).

3. A micro differential pressure transmitter with pressure relief function according to claim 2, characterized in that: The limiting mechanism (4) comprises a rotating shaft (41) fixedly mounted on the bottom surface of the first sealing sleeve (34), a blocking piece (42) being rotatably mounted on the bottom end of the rotating shaft (41), and a top surface of the blocking piece (42) being in contact with a bottom surface of the gasket (32).

4. A micro differential pressure transmitter with pressure relief function according to claim 3, characterized in that: The connecting mechanism (5) comprises two elastic diaphragms (52) fixedly mounted on the inner wall of the connecting cavity (51), the inner wall of the connecting cavity (51) and the outer wall of the elastic diaphragms (52) being completely fitted together, and a second sealing sleeve (53) is fixedly mounted on the top surface of the housing (1), the bottom end of the second sealing sleeve (53) extending into the interior of the connecting cavity (51).

5. A micro differential pressure transmitter with pressure relief function according to claim 4, characterized in that: The pressure measuring mechanism (6) comprises a piston (61) slidably mounted on the inner wall of the second sealing sleeve (53); a detection rod (62) is fixedly mounted on the top surface of the piston (61); the top end of the detection rod (62) extends to the outside of the second sealing sleeve (53); the detection rod (62) is slidably connected to the second sealing sleeve (53); a second spring (63) is sleeved on the detection rod (62); the bottom end of the second spring (63) is fixedly mounted on the top surface of the piston (61); the top end of the second spring (63) is fixedly connected to the inner wall of the second sealing sleeve (53); and a detection block (64) is fixedly mounted on the top end of the detection rod (62).

6. The micro differential pressure transmitter with pressure relief function according to claim 1, characterized in that: The housing (1) is provided with a plurality of mounting holes (7).

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