Explosion-proof micro differential pressure transmitter

Abstract

The utility model discloses an explosion-proof micro-differential pressure transmitter, which belongs to the technical field of micro-differential pressure transmitters and comprises a micro-differential pressure transmitter body, one side of the micro-differential pressure transmitter body is communicated with a pressure relief cylinder used for explosion-proof pressure reduction inside the micro-differential pressure transmitter, one side of the pressure relief cylinder is provided with a connecting rod, and the connecting rod is connected with the micro-differential pressure transmitter body. An adjusting assembly is arranged on one side of the outer wall of the connecting rod. According to the explosion-proof micro-differential pressure transmitter, due to the spring, the piston block, the pressure relief cylinder, the connecting rod and the adjusting assembly, after the elastic force of the spring is adjusted through the adjusting assembly, when the internal pressure of the micro-differential pressure transmitter is increased, the piston block is driven to move backwards, and when the piston block moves backwards to be exposed out of a pressure relief hole, the pressure relief cylinder is driven to move backwards; at the moment, the micro differential pressure transmitter main body is communicated with the outside through the pressure relief hole and releases pressure outwards, in this way, the explosion-proof effect of the differential pressure transmitter can be improved, the hidden danger of explosion caused by long-term operation of the differential pressure transmitter under the condition that the pressure in the differential pressure transmitter is too large is avoided, and therefore the service life of equipment is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of micro differential pressure transmitters, in particular to an explosion-proof micro differential pressure transmitter. Background Art

[0002] The differential pressure transmitter is a typical self-balancing detection instrument. It uses the working principle of negative feedback to overcome the influence of adverse factors such as component materials and processing technology. The differential pressure transmitter is used to prevent the medium in the pipeline from directly entering the transmitter. The pressure-sensitive diaphragm and the transmitter are connected by a capillary filled with fluid. It is mainly used to measure pressure, liquid, liquid level and flow. In real life, when the differential pressure transmitter is in use, its internal pressure will increase. Since the explosion-proof effect of most differential pressure transmitters is relatively general, when the differential pressure transmitter is operated for a long time under excessive pressure, there may be a hidden danger of explosion, which reduces the service life of the equipment.

[0003] A Chinese patent document (application publication number CN216433358U) discloses an anti-interference type micro differential pressure transmitter, which includes a micro differential pressure transmitter body, a wire, an anti-interference device, a display and a cleaning device. The surface of the micro differential pressure transmitter body is electrically connected to the wire, the surface of the micro differential pressure transmitter body is fixedly mounted with a display, the surface of the micro differential pressure transmitter body is fixedly mounted with an anti-interference device, and the surface of the micro differential pressure transmitter body is provided with a cleaning device.

[0004] It can be seen that the patent document cited above also has the same problem. Although it solves the problem that it is difficult for staff to clean the dust on the display screen of the micro differential pressure transmitter in the prior art, the explosion-proof effect of the micro differential pressure transmitter itself is relatively general. When the differential pressure transmitter operates for a long time under excessive pressure, there may be a risk of explosion, which reduces the service life of the equipment. Utility Model Content

[0005] The utility model aims to provide an explosion-proof micro differential pressure transmitter to solve the problems raised in the background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an explosion-proof micro-differential pressure transmitter, comprising a micro-differential pressure transmitter body, one side of the micro-differential pressure transmitter body is connected to a pressure relief cylinder for explosion-proof decompression inside the micro-differential pressure transmitter, one side of the pressure relief cylinder is equipped with a connecting rod, one side of the outer wall of the connecting rod is provided with an adjustment assembly, the other side of the outer wall of the connecting rod is sleeved with a spring, one end of the connecting rod is installed with a piston block, the outer wall of the piston block is in contact with the inner wall of the pressure relief cylinder, two positioning columns are installed on one side of the piston block, one end of the two positioning columns are respectively in contact with the inner wall of the pressure relief cylinder, and pressure relief holes are opened on both sides of the pressure relief cylinder.

[0007] As a preferred embodiment, the adjustment assembly includes a connecting ring, two adjustment rods are installed on one side of the connecting ring, and screw rods are engaged on opposite sides of the two adjustment rods, and a torque is installed on one end of the two screw rods.

[0008] As a preferred embodiment, a limit block is installed at the other end of the connecting rod.

[0009] As a preferred embodiment, one end of the spring is fixedly connected to the other side of the piston block, and the other end of the spring is fixedly connected to the other side of the connecting ring.

[0010] As a preferred embodiment, the bottom ends of the two adjusting rods are both equipped with limiting rods.

[0011] As a preferred embodiment, the outer walls of the two screw rods are equipped with rod seats, and one side of the two rod seats is fixedly connected to the two ends of one side of the pressure relief cylinder respectively.

[0012] As a preferred embodiment, the outer walls of the two adjusting rods respectively penetrate through two ends of one side of the pressure relief cylinder close to the connecting rod, and the distance between the two adjusting rods is greater than the outer diameter of the limit block.

[0013] Compared with the prior art, the technical effects and advantages of the utility model are as follows:

[0014] This explosion-proof micro differential pressure transmitter benefits from the spring, piston block, pressure relief cylinder, connecting rod and adjustment component. After the elastic force of the spring is adjusted by the adjustment component, when the internal pressure of the micro differential pressure transmitter increases, it will drive the piston block to move backward. When the piston block moves backward to expose the pressure relief hole, the main body of the micro differential pressure transmitter is connected to the outside through the pressure relief hole and releases pressure to the outside. In this way, the explosion-proof effect of the differential pressure transmitter can be improved, and the risk of explosion caused by long-term operation of the differential pressure transmitter under excessive pressure can be avoided, thereby increasing the service life of the equipment. At the same time, the design of the adjustment component facilitates the adjustment of the spring elastic force, thereby facilitating the adjustment of the pressure relief threshold of the micro differential pressure transmitter and facilitating pressure relief. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the utility model;

[0017] Figure 2This is a schematic diagram of the connection structure of the pressure relief cylinder of the utility model;

[0018] Figure 3 This is a cross-sectional view of the internal connection structure of the pressure relief cylinder of the utility model;

[0019] Figure 4 It is a schematic diagram of the screw rod connection structure of the utility model.

[0020] Description of reference numerals:

[0021] In the figure: 1. Micro differential pressure transmitter body; 2. Pressure relief cylinder; 201. Pressure relief hole; 3. Connecting rod; 4. Spring; 5. Piston block; 6. Positioning column; 7. Limit rod; 8. Connecting ring; 9. Adjusting rod; 10. Screw rod; 11. Twist; 12. Limit block; 13. Rod seat. DETAILED DESCRIPTION

[0022] In the following description, a large number of specific details are given to provide a more thorough understanding of the utility model. However, it is obvious to those skilled in the art that the utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the utility model, some technical features known in the art are not described.

[0023] Unless otherwise defined, the directions of up, down, left, right, front, back, inside and outside involved in this document are based on the directions of up, down, left, right, front, back, inside and outside in the figures shown in the utility model, and are explained here together.

[0024] The connection method can be bonding, welding, bolt connection, etc., depending on actual needs.

[0025] This embodiment provides Figures 1 to 4 The micro differential pressure transmitter body 1 shown in the figure includes a transmitter housing, and the transmitter housing is made of stainless steel. A display is provided on the front of the transmitter housing, and a wire is connected to the top of the transmitter. One side of the micro differential pressure transmitter body 1 is connected to a pressure relief cylinder 2 for explosion-proof decompression inside the micro differential pressure transmitter. A connecting rod 3 is installed on one side of the pressure relief cylinder 2, and an adjustment component is provided on one side of the outer wall of the connecting rod 3. A spring 4 is sleeved on the other side of the outer wall of the connecting rod 3, and a piston block 5 is installed at one end of the connecting rod 3, and the outer wall of the piston block 5 is in contact with the inner wall of the pressure relief cylinder 2.

[0026] The present embodiment provides that two positioning columns 6 are installed on one side of the piston block 5, and one end of the two positioning columns 6 is respectively in contact with the inner wall of the pressure relief cylinder 2, and pressure relief holes 201 are opened on both sides of the pressure relief cylinder 2. The pressure relief holes 201 are connected with the inside of the pressure relief cylinder 2, and the pressure relief holes 201 are located behind the piston block 5. When the internal pressure of the micro-differential pressure transmitter body 1 increases, it will drive the piston block 5 to move backward. When the piston block 5 moves backward to expose the pressure relief holes 201, the micro-differential pressure transmitter body 1 is connected with the outside through the pressure relief holes 201 and releases pressure to the outside. This can improve the explosion-proof effect and avoid the hidden danger of explosion caused by long-term operation of the differential pressure transmitter under excessive pressure, thereby improving the service life of the equipment.

[0027] The micro differential pressure transmitter is a conventional instrument. Its working principle, size and model are irrelevant to the function of this application, so no further description will be given. The control method of the present invention is controlled by a controller. The control circuit of the controller can be realized by simple programming by technicians in this field. The provision of power is also common knowledge in this field. The present invention is mainly used to protect mechanical devices, so the present invention will no longer explain the control method and circuit connection in detail.

[0028] The adjustment assembly provided in this embodiment includes a connecting ring 8, the inner wall of the connecting ring 8 is slidably connected to the outer wall of the connecting rod 3, two adjusting rods 9 are installed on one side of the connecting ring 8, and the opposite sides of the two adjusting rods 9 are both engaged with a screw rod 10. One side of the adjusting rod 9 is provided with a plurality of clamping holes adapted to the screw rod 10, and the screw rod 10 is engaged with the adjusting rod 9 through the clamping holes. A turning knob 11 is installed at one end of the two screw rods 10, and the outer wall of the turning knob 11 is provided with an anti-slip thread to increase the friction between the human hand and the outer wall of the turning knob 11, so as to facilitate the rotation of the turning knob 11.

[0029] In this embodiment, a limit block 12 is installed at the other end of the connecting rod 3 , one end of the spring 4 is fixedly connected to the other side of the piston block 5 , and the other end of the spring 4 is fixedly connected to the other side of the connecting ring 8 .

[0030] The present embodiment provides that the bottom ends of the two adjusting rods 9 are both installed with limit rods 7, the outer walls of the two screw rods 10 are both equipped with rod seats 13, the outer walls of the screw rods 10 pass through the rod seats 13, and are connected to the internal threads of the rod seats 13, one side of the two rod seats 13 is respectively fixedly connected to the two ends of one side of the pressure relief cylinder 2, the outer walls of the two adjusting rods 9 respectively pass through the two ends of one side of the pressure relief cylinder 2 close to the connecting rod 3, and are slidably connected to the one side of the pressure relief cylinder 2, and the spacing between the two adjusting rods 9 is greater than the outer diameter of the limit block 12, so that motion interference between the limit block 12 and the adjusting rod 9 can be avoided.

[0031] How it works

[0032] First, rotate the two knobs 11 respectively. The rotation of the knob 11 drives the two screw rods 10 to move outward until the screw rod 10 is separated from one side of the adjusting rod 9. Then move the adjusting rod 9 inward or outward. The adjusting rod 9 moves through the connecting ring 8 to squeeze or stretch the spring 4. After reaching the appropriate position, rotate the knob 11 in the opposite direction until the screw rod 10 and the corresponding holes of the adjusting rod 9 are engaged. This makes it convenient to adjust the spring elastic force, thereby facilitating the adjustment of the pressure relief threshold of the micro-differential pressure transmitter body 1 and facilitating pressure relief. When the internal pressure of the micro-differential pressure transmitter body 1 increases, it will drive the piston block 5 to move backward. When the piston block 5 moves backward to expose the pressure relief hole 201, the micro-differential pressure transmitter body 1 is connected to the outside through the pressure relief hole 201 and relieves pressure to the outside. In this way, the explosion-proof effect of the differential pressure transmitter can be improved, and the risk of explosion caused by long-term operation of the differential pressure transmitter under excessive pressure can be avoided, thereby improving the service life of the equipment.

[0033] It should be noted that, in this article, relational terms such as one and two are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions. The sentence "includes an element defined by ... does not exclude the existence of other identical elements in the process, method, article or device including the element".

[0034] Although the 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. An explosion-proof micro differential pressure transmitter, comprising a micro differential pressure transmitter body (1), one side of the micro differential pressure transmitter body (1) being connected to a pressure relief cylinder (2) for explosion-proof pressure relief inside the micro differential pressure transmitter, characterized in that: A connecting rod (3) is mounted on one side of the pressure relief cylinder (2), an adjustment assembly is arranged on one side of the outer wall of the connecting rod (3), a spring (4) is sleeved on the other side of the outer wall of the connecting rod (3), a piston block (5) is mounted on one end of the connecting rod (3), the outer wall of the piston block (5) is in contact with the inner wall of the pressure relief cylinder (2), two positioning columns (6) are mounted on one side of the piston block (5), one end of the two positioning columns (6) are respectively in contact with the inner wall of the pressure relief cylinder (2), and pressure relief holes (201) are provided on both sides of the pressure relief cylinder (2).

2. The explosion-proof micro differential pressure transmitter according to claim 1 is characterized in that: The adjustment assembly comprises a connecting ring (8), two adjusting rods (9) are mounted on one side of the connecting ring (8), a screw rod (10) is engaged on the opposite side of the two adjusting rods (9), and a turning knob (11) is mounted on one end of the two screw rods (10).

3. The explosion-proof micro differential pressure transmitter according to claim 2 is characterized in that: A limit block (12) is installed at the other end of the connecting rod (3).

4. The explosion-proof micro differential pressure transmitter according to claim 1 is characterized in that: One end of the spring (4) is fixedly connected to the other side of the piston block (5), and the other end of the spring (4) is fixedly connected to the other side of the connecting ring (8).

5. The explosion-proof micro differential pressure transmitter according to claim 2 is characterized in that: Limit rods (7) are installed at the bottom ends of the two adjustment rods (9).

6. The explosion-proof micro differential pressure transmitter according to claim 2 is characterized in that: The outer walls of the two screw rods (10) are both equipped with rod seats (13), and one side of the two rod seats (13) is respectively fixedly connected to two ends of one side of the pressure relief cylinder (2).

7. The explosion-proof micro differential pressure transmitter according to claim 3 is characterized in that: The outer walls of the two adjusting rods (9) respectively penetrate two ends of one side of the pressure relief cylinder (2) close to the connecting rod (3), and the distance between the two adjusting rods (9) is greater than the outer diameter of the limit block (12).

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