Pressure gauge

Abstract

The invention discloses a pressure gauge, and relates to the technical field of pressure detection. A joint assembly; the first end of the spring tube is communicated with the joint assembly; an elastic buffer mechanism, a transmission mechanism and a movement assembly; the movement assembly comprises pointers; the second end of the bourdon tube is connected to the first end of the elastic buffering mechanism, the second end of the elastic buffering mechanism is connected to the first end of the transmission mechanism, and the second end of the transmission mechanism is connected to the movement assembly, so that elastic deformation of the bourdon tube is transmitted to the movement assembly through the elastic buffering mechanism and the transmission mechanism in sequence, and the pointer rotates. In the scheme, the elastic buffer mechanism is additionally arranged between the bourdon tube and the transmission mechanism, and the elastic buffer mechanism can absorb expected accidental deformation impact displacement of the tail end of the bourdon tube caused by vibration of a working environment and pulsation impact of a measuring medium, so that jumping of the tail end of the pointer is greatly relieved, and pressure detection is more accurate.

Description

Technical Field

[0001] This invention relates to the field of pressure detection technology, and in particular to a pressure gauge. Background Technology

[0002] A pressure gauge is an instrument that uses an elastic element as a sensing element to measure and indicate pressures higher than the ambient pressure. It is widely used and can be found in almost all industrial processes and scientific research fields. It can be seen everywhere in fields such as heat pipelines, oil and gas transmission, water and gas supply systems, and vehicle repair and maintenance shops.

[0003] However, traditional pressure gauges are prone to pointer vibration and displacement caused by vibrations in the working environment and the impact of medium pulsation, which can lead to inaccurate measurements. Summary of the Invention

[0004] In view of this, the present invention provides a pressure gauge that, by setting an elastic buffer mechanism, makes the measurement structure more accurate.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pressure gauge, comprising:

[0007] Bourdon tube;

[0008] A connector assembly; the first end of the spring tube is connected to the connector assembly;

[0009] The mechanism includes a flexible buffer, a transmission mechanism, and a movement assembly; the movement assembly includes a pointer.

[0010] The second end of the Bourdon tube is connected to the first end of the elastic buffer mechanism, the second end of the elastic buffer mechanism is connected to the first end of the transmission mechanism, and the second end of the transmission mechanism is connected to the movement assembly, so that the elastic deformation of the Bourdon tube is transmitted to the movement assembly in sequence through the elastic buffer mechanism and the transmission mechanism, causing the pointer to rotate.

[0011] Preferably, the elastic buffer mechanism includes: a first elastic buffer mechanism; the first elastic buffer mechanism includes: a first spring, a first connecting rod, and a first rod seat;

[0012] The first connecting rod is mounted on the first rod seat, the first rod seat has a first connecting part, the first connecting part is connected to the transmission mechanism, the first connecting rod is connected to the second end of the spring tube, wherein the first spring can provide elastic deformation acting on the first connecting rod.

[0013] Preferably, the first rod seat has a rectangular hole, the first connecting rod passes through the rectangular hole, and the first spring is provided between the peripheral wall of the first connecting rod inside the rectangular hole and the peripheral wall of the rectangular hole.

[0014] Preferably, the rectangular hole is a rectangular hole, the number of the first springs is two, the first connecting rod passes through the middle of the rectangular hole and is connected to the second end of the spring tube, and the first springs are arranged along the length direction of the rectangular hole;

[0015] One of the first springs is disposed between the first connecting rod and a peripheral wall corresponding to the rectangular hole, and the other first spring is disposed between the first connecting rod and another peripheral wall corresponding to the rectangular hole.

[0016] Preferably, the elastic buffer mechanism includes: a second elastic buffer mechanism; the second elastic buffer mechanism includes: a second spring, a second connecting rod, and a second rod seat;

[0017] The second rod seat has a through hole, through which the second connecting rod passes, and the first end of the second connecting rod passing through the through hole is connected to the transmission mechanism. The second rod seat has a second connecting part for connecting the spring tube. The second end that does not pass through the through hole is fitted with the second spring, and the second end of the second connecting rod is fitted with an end cap, such that the first end of the second spring abuts against the lower end face of the end cap, and the second end of the second connecting rod abuts against the upper end face of the second rod seat.

[0018] Preferably, the second end of the second spring abuts against the upper end face of the second rod seat via the second slider.

[0019] Preferably, the upper end surface of the second rod seat is a tapered concave structure, and the tapering direction of the tapering concave structure is from the edge of the second rod seat to the concave center of the second rod seat.

[0020] Preferably, the connector assembly includes: a connector and a medium flow limiting device;

[0021] The connector, the medium flow limiting device, and the first end of the spring tube are connected in sequence.

[0022] Preferably, the pressure gauge further includes a limiting rod disposed on the panel;

[0023] The transmission mechanism includes: a sector-shaped gear and a first rotating shaft, wherein the two ends of the sector-shaped gear are a tooth end and a connecting end, respectively; the connecting end is connected to the elastic buffer mechanism, and the first rotating shaft passes through the middle end of the sector-shaped gear;

[0024] The movement assembly further includes: a second rotating shaft, the pointer being sleeved on the first end of the second rotating shaft, and the second end of the second rotating shaft being connected to the toothed end in a transmission connection;

[0025] The limiting rod is used to restrict the movement of the sector-shaped gear.

[0026] Preferably, the pressure gauge further includes: a shaft damping block;

[0027] The rotating shaft damping block is sleeved on the outer peripheral wall of the second rotating shaft and can rotate synchronously with the second rotating shaft. The side of the rotating shaft damping block facing the panel has a groove, which is used to fill damping grease.

[0028] As can be seen from the above technical solution, the pressure gauge provided by the present invention adds an elastic buffer mechanism between the Bourdon tube and the transmission mechanism. The elastic buffer mechanism can absorb the unexpected deformation and impact displacement of the end of the Bourdon tube caused by vibration of the working environment and pulsation impact of the measuring medium, greatly reducing the jumping of the pointer end and making the pressure detection more accurate. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of one embodiment of the pressure gauge;

[0031] Figure 2 for Figure 1 Side view;

[0032] Figure 3 This is a schematic diagram of the structure of the second embodiment of the pressure gauge;

[0033] Figure 4 for Figure 3 A schematic diagram with part of the structure hidden;

[0034] Figure 5 for Figure 3 A schematic diagram showing the hidden portion of the structure;

[0035] Figure 6 for Figure 3 A schematic diagram showing a portion of the structure that is hidden.

[0036] Figure 7 This is a top view of the first elastic buffer mechanism of this pressure gauge;

[0037] Figure 8 This is a schematic diagram of the structure of three embodiments of this pressure gauge;

[0038] Figure 9 for Figure 8 A schematic diagram with part of the structure hidden;

[0039] Figure 10 for Figure 8 A schematic diagram showing the hidden portion of the structure;

[0040] Figure 11 This is a three-dimensional view of the second elastic buffer mechanism of this pressure gauge;

[0041] Figure 12 This is a top view of the second elastic buffer mechanism of this pressure gauge;

[0042] Figure 13 for Figure 12 A sectional view along the BB cutting plane;

[0043] Figure 14 This is a schematic diagram of the structure of the fourth embodiment of this pressure gauge.

[0044] The meanings of the various reference numerals in the figure are as follows:

[0045] 10 is a Bourdon tube;

[0046] 20 is the connector assembly, 21 is the connector, and 22 is the medium flow limiting device;

[0047] 30 is the first elastic buffer mechanism, 31 is the first spring, 32 is the first connecting rod, 33 is the first rod seat, 34 is the first connecting part, and 35 is the first slider;

[0048] 40 is the transmission mechanism, 41 is the sector-shaped gear, 411 is the tooth end, 412 is the connecting end, and 42 is the first rotating shaft;

[0049] 50 is the movement assembly, 51 is the hand, 52 is the second pivot, 53 is the dial, and 54 is the faceplate;

[0050] 60 is the second elastic buffer mechanism, 61 is the second spring, 62 is the second connecting rod, 63 is the second rod seat, 64 is the second connecting part, and 65 is the second slider;

[0051] 70 is the shaft damping block;

[0052] 80 is the limit rod. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] The pressure gauge provided in the embodiments of the present invention, such as Figure 1 and Figure 2 As shown, it includes:

[0055] Bourdon tube 10;

[0056] The first end of the spring tube 10 is connected to the connector assembly 20;

[0057] The mechanism includes a flexible buffer, a transmission mechanism 40, and a movement assembly 50, the movement assembly 50 including a pointer 51;

[0058] The second end of the Bourdon tube 10 is connected to the first end of the elastic buffer mechanism, the second end of the elastic buffer mechanism is connected to the first end of the transmission mechanism 40, and the second end of the transmission mechanism 40 is connected to the movement assembly 50, so that the elastic deformation of the Bourdon tube 10 is transmitted to the movement assembly 50 in sequence through the elastic buffer mechanism and the transmission mechanism 40, causing the pointer 51 to rotate.

[0059] In the above technical solution, when the measured medium (gas) enters the connector assembly 20 of the pressure gauge, the gas flows into the internal Bourdon tube 10. Due to the increased internal pressure, the Bourdon tube 10 undergoes elastic deformation. This elastic deformation drives the transmission mechanism 40 to move, which in turn drives the pointer 51 of the movement assembly 50 to rotate, thereby achieving the measurement of the gas pressure value. In this solution, an elastic buffer mechanism is added between the Bourdon tube 10 and the transmission mechanism 40. This elastic buffer mechanism can absorb unexpected deformation and impact displacement at the end of the Bourdon tube 10 caused by vibrations in the working environment and pulsating impacts of the measured medium, significantly reducing the jump at the end of the pointer 51 and making the pressure detection more accurate.

[0060] In one of the alternative technical solutions, such as Figure 1 As shown, the pressure gauge is equipped with a dial 53 to facilitate reading the measured values.

[0061] In one of the alternative technical solutions, such as Figure 3 and Figure 4 The elastic buffer mechanism shown includes: a first elastic buffer mechanism 30; the first elastic buffer mechanism 30 includes: a first spring 31, a first connecting rod 32 and a first rod seat 33;

[0062] The first connecting rod 32 is mounted on the first rod seat 33, which has a first connecting portion 34 connected to the transmission mechanism 40. The first connecting rod 32 is connected to the second end of the Bourdon tube 10. The first spring 31 provides elastic deformation acting on the first connecting rod 32. This elastic deformation acts as a buffer, absorbing unexpected deformation and impact displacement at the end of the Bourdon tube 10 caused by vibration of the working environment or pulsation of the measuring medium, thus significantly reducing the jump at the end of the pointer 51.

[0063] Optimize the above technical solutions, such as Figure 5 As shown, the first rod seat 33 has a rectangular hole, the first connecting rod 32 passes through the rectangular hole, and a first spring 31 is provided between the peripheral wall of the first connecting rod 32 inside the rectangular hole and the peripheral wall of the rectangular hole. In this technical solution, by setting the first spring 31 between the first connecting rod 32 and the peripheral wall of the rectangular hole, the elastic deformation acting on the first connecting rod 32 can be accommodated.

[0064] Further optimization of the above technical solutions, such as Figure 5 and Figure 7 As shown, the rectangular hole is a rectangular hole, there are two first springs 31, the first connecting rod 32 passes through the middle of the rectangular hole and is connected to the second end of the spring tube 10, and the first springs 31 are arranged along the length of the rectangular hole.

[0065] One first spring 31 is disposed between the first connecting rod 32 and the peripheral wall of a corresponding rectangular hole, and the other first spring 31 is disposed between the first connecting rod 32 and the peripheral wall of another corresponding rectangular hole.

[0066] In the above technical solution, by providing first springs 31 on both sides of the first connecting rod 32, the first connecting rod 32 can be subjected to the elastic deformation force provided by the first springs 31 on both sides. Preferably, as follows... Figure 5 and Figure 7 As shown, the first elastic buffer mechanism 30 further includes: a first slider 35, and there are two first sliders 35. One first slider 35 is disposed between a first spring 31 and the peripheral wall of the first connecting rod 32, and the other first slider 35 is disposed between another first spring 31 and the peripheral wall of the first connecting rod 32.

[0067] In one specific embodiment, such as Figure 3 , Figure 4 and Figure 5 As shown, the deformation of the Bourdon tube 10 due to normal pressure is transmitted normally to the movement 50 via the first elastic buffer mechanism 30 and the transmission mechanism 40, causing the pointer 51 to rotate and indicate the pressure reading. If the Bourdon tube 10 experiences an instantaneous impact load due to the working environment or medium pulse, the impact load is transmitted to the first slider 35 via the first connecting rod 32, and the impact load is absorbed by the slight deformation of the first spring 31. Due to the change from a rigid connection to a flexible connection (through the setting of the first elastic buffer mechanism 30), the displacement transmitted to the movement 50 changes from an instantaneous change to an overall pressure trend, effectively making the rotation of the pointer 51 more stable.

[0068] In one of the alternative technical solutions, such as Figure 8 and Figure 9As shown, the elastic buffer mechanism includes: a second elastic buffer mechanism 60; the second elastic buffer mechanism 60 includes: a second spring 61, a second connecting rod 62, and a second rod seat 63;

[0069] The second rod seat 63 has a through hole through which the second connecting rod 62 passes. The first end of the second connecting rod 62 passing through the through hole is connected to the transmission mechanism 40, and the second end not passing through the through hole is fitted with a second spring 61. The second end of the second connecting rod 62 is fitted with an end cap, such that the first end of the second spring 61 abuts against the lower end face of the end cap, and the second end of the second connecting rod 62 abuts against the upper end face of the second rod seat 63. Preferably, the second connecting rod 62 can be a screw.

[0070] In the above technical solution, the second spring 61 sleeved on the second end can provide elastic deformation force. This elastic deformation can play a buffering role. This buffering role can absorb the unexpected deformation impact displacement of the end of the spring tube 10 due to vibration of the working environment and pulsation impact of the measuring medium, and greatly reduce the jumping of the end of the pointer 51.

[0071] In one of the alternative technical solutions, such as Figure 9 As shown, the second end of the second spring 61 abuts against the upper end face of the second rod seat 63 via the second slider 65. Specifically, the second slider 65 has a through-hole structure, and the inner diameter of the through-hole is larger than the diameter of the second connecting rod 62, so that the second slider 65 is sleeved on the outer peripheral wall of the second connecting rod 62 through the through-hole, and can move along the axial direction of the second connecting rod 62 under the action of the second spring 61.

[0072] In one of the alternative technical solutions, such as Figure 10 , Figure 12 and Figure 13 As shown, the upper surface of the second rod seat 63 is a tapered recessed structure, with the tapering direction extending from the edge of the second rod seat 63 towards the center of the recess. In this technical solution, the tapered recessed structure can play a certain guiding role. During use, the second slider 65 moves between the bottom and the end of the tapered recessed structure under the action of the second spring 61.

[0073] In one specific embodiment, Figure 8 , Figure 12 and Figure 13 As shown, under normal working conditions, the second connecting rod 62 compresses the second spring 61, causing the second slider 65 to be in close contact with the slope on the second rod seat 63. When the spring tube 10 vibrates due to the working environment and medium pulse, the small displacement is absorbed by the second spring 61 under the action of the slope on the second rod seat 63 and the second slider 65, protecting the tip of the pointer 51 from jumping arbitrarily.

[0074] In one of the alternative technical solutions, such as Figure 1 As shown, the connector assembly 20 includes: a connector 21 and a medium flow limiting device 22;

[0075] The connector 21, the medium flow limiting device 22, and the first end of the spring tube 10 are connected in sequence.

[0076] In the above technical solution, the medium flow limiting device 22 is used to limit the flow rate of the measured medium into the connector 21, and to protect the spring tube 10 from instantaneous large-scale deformation caused by a large amount of medium rushing in at an instant.

[0077] The above technical solution is optimized by using a hollow screw as the medium flow limiting device 22. The first end of the hollow screw is connected to the connector 21, and the second end of the hollow screw is connected to the spring tube 10. The diameter of the hollow screw gradually decreases from the first end to the second end. The use of a hollow screw helps to reduce the cost of this pressure gauge.

[0078] In one of the alternative technical solutions, such as Figure 6 and Figure 11 As shown, the pressure gauge also includes a limit rod 80 disposed on the panel 54;

[0079] The transmission mechanism 40 includes a sector-shaped gear 41 and a first rotating shaft 42. The two ends of the sector-shaped gear 41 are a tooth end 411 and a connecting end 412, respectively. The connecting end 412 is connected to an elastic buffer mechanism. The first rotating shaft 42 passes through the middle end of the sector-shaped gear 41. It can be understood that the middle end of the sector-shaped gear 41 has a through hole, and the first rotating shaft 42 passes through the through hole, so that the sector-shaped gear 41 can rotate around the first rotating shaft 42.

[0080] The movement assembly 50 also includes: a second rotating shaft 52, a pointer 51 is sleeved on the first end of the second rotating shaft 52, and the second end of the second rotating shaft 52 is connected to the tooth end 411 in a transmission connection. This can be understood as the second end of the second rotating shaft 52 and the tooth end 411 meshing with each other.

[0081] The limiting rod 80 is used to restrict the movement of the sector tooth 41, which can be understood as the limiting rod 80 restricting the extreme position of the sector tooth 41.

[0082] In the above technical solution, combined with Figure 6In the illustrated embodiment, the limiting rod 80 is used to limit the extreme position of the sector-shaped gear 41 of the transmission mechanism 40. For example, after the sector-shaped gear 41 and the limiting rod 80 abut against each other, the sector-shaped gear 41 will no longer rotate after the medium pressure exceeds the maximum range. The first elastic buffer mechanism 30 expands the range of motion of the spring tube 10 as the spring tube 10 continues to move, protecting the spring tube 10 from deformation and failure due to the limiting protection of the movement 50. In practical use, if the first elastic buffer mechanism 30 is not provided, after the spring tube 10 reaches the designed maximum pressure, the movement 50 will limit the protection, and the sector-shaped gear 41 will no longer rotate. In a conventional pressure gauge, the relevant components of the movement 50 will limit the further deformation of the spring tube 10, causing it to fail. After the first elastic buffer mechanism 30 is set, the movement 50 is limited, and the first rod seat 33 basically stops moving. The first connecting rod 32 connected to the spring tube 10 pushes the first spring 31 and the first slider 35 to continue to move until the first spring 31 is compressed to the limit, which expands the pressure of the free deformation of the spring tube 10 and plays a protective role for the spring tube 10. When the medium pressure is reset to the normal pressure range, the first spring 31 is reset under the action of the spring, and the entire first elastic buffer mechanism 30 normally drives the movement of the movement 50 to indicate the pressure gauge pressure.

[0083] Combination Figure 11 As illustrated in the embodiment, after the spring tube 10 reaches its designed maximum pressure, the sector tooth 41 and the limiting rod 80 abut against each other, causing the sector tooth 41 to stop rotating. The fixed second connecting rod 62, which is connected to the spring tube 10, continues to move in the groove within the second rod seat 63. Due to the relative displacement between the fixed second connecting rod 62 and the second rod seat 63, the second spring 61, under the action of the slope of the second rod seat 63, generates a displacement perpendicular to the fixed second spring 61. The second spring 61 absorbs energy and is compressed under the pressure of the second slider 65 until it reaches its limit. When the medium pressure returns to the normal pressure range, the second slider 65 returns to its original position under the action of the second spring 61. The entire second elastic buffer mechanism 60 then normally drives the movement of the movement of the core 50, indicating the pressure gauge pressure.

[0084] In one of the alternative technical solutions, such as Figure 6 The limiting rod 80 can be a limiting pin. The panel has an oblong through hole. The limiting pin passes through the corresponding position of the oblong through hole. The through end of the limiting pin cooperates with the fan-shaped toothed part 41 to play a limiting role.

[0085] In one of the alternative technical solutions, such as Figure 5 and Figure 9 As shown, the pressure gauge also includes: a shaft damping block 70;

[0086] A pivot damping block 70 is fitted onto the outer peripheral wall of the second pivot 52 and can rotate synchronously with the second pivot 52. A panel 54 is provided on the side of the pivot damping block 70 facing the pointer 51, and the panel 54 is used to fill damping grease. The damping grease provides motion damping for the movement of the watch hands. The selected high-viscosity damping grease is paste-like at room temperature, does not flow easily, and requires very little quantity, so there is no need to worry about leakage and environmental pollution. Furthermore, preferably, the side of the pivot damping block 70 facing the panel 54 abuts against the panel 54 to generate contact friction.

[0087] In one alternative technical solution, the pressure gauge is an oil-free dry-type buffer shock-resistant pressure gauge, which avoids the environmental pollution problem caused by viscous damping oil due to sealing failure of instruments.

[0088] In one of the alternative technical solutions, such as Figure 14 As shown, the tooth tip 411 of the fan-shaped toothed component 41 is thickened, which increases the contact area between the tooth tip 411 and the second rotating shaft 52, effectively increasing the lifespan of the movement during actual use.

[0089] The technical features mentioned above, those to be mentioned below, and those shown individually in the accompanying drawings can be combined arbitrarily, provided that the combined technical features are not contradictory. All feasible combinations of features are the technical content explicitly described herein. Any one of the multiple sub-features contained in the same statement can be applied independently, without necessarily being applied together with other sub-features.

[0090] The advantages of this patent are:

[0091] I. The oil-free dry buffer shock-resistant pressure gauge involved in this patent does not require concern about environmental pollution or failure of shock resistance caused by the failure of the casing seal of conventional shock-resistant pressure gauges.

[0092] 2. Add any number of rotating shaft damping blocks to the movement as needed to improve the rotation damping of the movement. Since only a very small amount of high-viscosity damping grease needs to be filled, the impact on the degree of environmental pollution is minimal. When used in combination with a flexible buffer linkage mechanism, it greatly reduces the vibration of the pointer end caused by vibration of the working environment and medium pulse, making the pointer rotate more smoothly and the reading more readable.

[0093] Third, the use of an elastic buffer mechanism allows the Bourdon tube to continue to deform normally, instead of being limited by the mechanism that restricts the movement when the measured medium reaches the set maximum pressure. This expands the deformation range of the Bourdon tube and protects it from deformation and failure.

[0094] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0095] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure gauge, characterized in that, include: Bourdon tube (10); Connector assembly (20); the first end of the spring tube (10) is connected to the connector assembly (20); The mechanism includes a flexible buffer, a transmission mechanism (40), and a movement assembly (50); the movement assembly (50) includes a pointer (51). The second end of the spring tube (10) is connected to the first end of the elastic buffer mechanism, the second end of the elastic buffer mechanism is connected to the first end of the transmission mechanism (40), and the second end of the transmission mechanism (40) is connected to the movement assembly (50), so that the elastic deformation of the spring tube (10) is transmitted to the movement assembly (50) in sequence through the elastic buffer mechanism and the transmission mechanism (40), causing the pointer (51) to rotate.

2. The pressure gauge according to claim 1, characterized in that, The elastic buffer mechanism includes: a first elastic buffer mechanism (30); the first elastic buffer mechanism (30) includes: a first spring (31), a first connecting rod (32) and a first rod seat (33); The first connecting rod (32) is mounted on the first rod seat (33), the first rod seat (33) has a first connecting part (34), the first connecting part (34) is connected to the transmission mechanism (40), the first connecting rod (32) is connected to the second end of the spring tube (10), wherein the first spring (31) is capable of providing elastic deformation acting on the first connecting rod (32).

3. The pressure gauge according to claim 2, characterized in that, The first rod seat (33) has a rectangular hole, the first connecting rod (32) passes through the rectangular hole, and the first connecting rod (32) is provided with the first spring (31) between the peripheral wall of the rectangular hole and the peripheral wall of the rectangular hole.

4. The pressure gauge according to claim 3, characterized in that, The rectangular hole is a rectangular hole, and there are two first springs (31). The first connecting rod (32) passes through the middle of the rectangular hole and is connected to the second end of the spring tube (10). The first springs (31) are arranged along the length direction of the rectangular hole. One of the first springs (31) is disposed between the first connecting rod (32) and a corresponding peripheral wall of the rectangular hole, and the other first spring (31) is disposed between the first connecting rod (32) and another corresponding peripheral wall of the rectangular hole.

5. The pressure gauge according to claim 1, characterized in that, The elastic buffer mechanism includes: a second elastic buffer mechanism (60); the second elastic buffer mechanism (60) includes: a second spring (61), a second connecting rod (62), and a second rod seat (63); The second rod seat (63) has a through hole, the second connecting rod (62) passes through the through hole, and the first end of the second connecting rod (62) passing through the through hole is connected to the transmission mechanism (40). The second rod seat (63) has a second connecting part (64), which is used to connect the spring tube (10). The second end that does not pass through the through hole is fitted with the second spring (61), and the second end of the second connecting rod (62) is fitted with an end head, so that the first end of the second spring (61) abuts against the lower end face of the end head, and the second end of the second connecting rod (62) abuts against the upper end face of the second rod seat (63).

6. The pressure gauge according to claim 5, characterized in that, The second end of the second spring (61) abuts against the upper end face of the second rod seat (63) via the second slider (65).

7. The pressure gauge according to claim 6, characterized in that, The upper surface of the second rod seat (63) is a tapered concave structure, and the tapering direction of the tapering concave structure is from the edge of the second rod seat (63) to the concave center of the second rod seat (63).

8. The pressure gauge according to claim 1, characterized in that, The connector assembly (20) includes: a connector (21) and a medium flow limiting device (22); The connector (21), the medium flow limiting device (22), and the first end of the spring tube (10) are connected in sequence.

9. The pressure gauge according to claim 1, characterized in that, The pressure gauge also includes a limiting rod (80) disposed on the panel (54). The transmission mechanism (40) includes: a sector-shaped gear (41) and a first rotating shaft (42), the two ends of the sector-shaped gear (41) being a tooth end (411) and a connecting end (412) respectively; the connecting end (412) is connected to the elastic buffer mechanism, and the first rotating shaft (42) passes through the middle end of the sector-shaped gear (41); The movement assembly (50) further includes: a second rotating shaft (52), the pointer (51) is sleeved on the first end of the second rotating shaft (52), and the second end of the second rotating shaft (52) and the tooth end (411) are connected in a transmission. The limiting rod (80) is used to limit the movement of the sector tooth (41).

10. The pressure gauge according to claim 9, characterized in that, The pressure gauge also includes: a shaft damping block (70); The rotating shaft damping block (70) is sleeved on the outer peripheral wall of the second rotating shaft (52) and can rotate synchronously with the second rotating shaft (52). The rotating shaft damping block (70) has a groove on the side facing the panel (54) and the groove is used to fill damping grease.

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