A light and low cost pressure gauge

Abstract

The utility model discloses a light low -cost pressure gauge, including plastic joint, fixed block and spring pipe, install fixed block on the plastic joint, the fixed block is fixedly connected with the one end of spring pipe, be provided with first gas passage in the plastic joint, be provided with second gas passage on the fixed block, the lower extreme of second gas passage is linked together with the export end of first gas passage in the plastic joint, the other end of second gas passage is communicated with the cavity in spring pipe. The utility model discloses that the copper material quality is changed for the plastic material quality in gas inlet joint, has reduced the weight of pressure gauge, has reduced the manufacturing cost of pressure gauge, and the rust will not take place in gas inlet joint. Spring pipe realizes the connection with plastic joint through fixed block, and the problem that spring pipe and plastic joint can not be welded directly is solved effectively. The gas inlet joint, fixed block and the shell are fixedly connected through screw, and the connection is firm and convenient to assemble.

Description

Technical Field

[0001] This utility model relates to the field of pressure gauge technology, and in particular to a lightweight and low-cost pressure gauge. Background Technology

[0002] A pressure gauge is a commonly used instrument for measuring the pressure of medical devices. It includes an inlet connector, a Bourdon tube, a pointer, a transmission mechanism, a dial, and a housing. The inlet connector is installed on the pipe being measured. Gas in the pipe enters the cavity inside the Bourdon tube through a plastic connector. Under the pressure of the gas, the free end of the Bourdon tube is compressed and displaced. This displacement, via a gear and linkage mechanism in the movement, drives the pointer to rotate and indicate the gas pressure value. Currently, the Bourdon tube and inlet connector of existing pressure gauges are made of copper. Copper is expensive and heavy, and the exposed copper connector is prone to corrosion, leading to impurities and affecting the gauge's performance. The inlet connector needs to be replaced with plastic to reduce manufacturing costs. However, copper Bourdon tubes and plastic inlet connectors cannot be directly welded. Therefore, a fixing block is needed between the Bourdon tube and the plastic inlet connector to securely mount the Bourdon tube. Utility Model Content

[0003] To address the aforementioned problems, this utility model aims to provide a lightweight and low-cost pressure gauge to solve the issues of large weight, high cost, and susceptibility to rust in the pressure gauge's air inlet connector.

[0004] The technical problem solved by this utility model can be achieved by the following technical solution: a lightweight and low-cost pressure gauge, including a plastic connector, a fixing block and a Bourdon tube, wherein the fixing block is installed on the plastic connector and is fixedly connected to one end of the Bourdon tube, a first gas channel is provided inside the plastic connector, a second gas channel is provided on the fixing block, the lower end of the second gas channel is connected to the outlet end of the first gas channel inside the plastic connector, and the other end of the second gas channel is connected to the cavity inside the Bourdon tube.

[0005] The plastic connector is provided with a positioning post, the outlet end of the first gas channel passes through the center of the positioning post, the fixing block is provided with a positioning hole, the inlet end of the second gas channel is connected to the positioning hole, and the positioning post and the positioning hole are connected to each other.

[0006] An O-ring is provided inside the positioning hole, and the O-ring is located between the upper end face of the positioning post and the top surface of the positioning hole.

[0007] A connecting groove is provided on one side of the fixing block, and one end of the spring tube is fixed in the connecting groove.

[0008] The upper end of the plastic connector is provided with a plastic casing, the fixing block and the spring tube are provided inside the plastic casing, the plastic casing is provided with a through hole, the fixing block is provided with a screw hole, and the plastic connector is provided with a mounting hole. The screw passes through the through hole and the mounting hole and is screwed into the screw hole to fix the plastic casing, plastic connector and fixing block together.

[0009] The upper part of the fixing block is provided with a movement fixing hole. The core pressure pin passes through the movement and the dial and fixes the fixing block, the movement and the dial together through the movement fixing hole.

[0010] Compared with the prior art, this utility model has the following advantages: the air inlet connector of this utility model is changed from copper to plastic, which reduces the weight of the pressure gauge and reduces the manufacturing cost of the pressure gauge. The air inlet connector will not rust. The spring tube is connected to the plastic connector through the fixing block, which effectively solves the problem that the spring tube and the plastic connector cannot be directly welded. The air inlet connector, the fixing block and the gauge housing are fixedly connected by screws, which makes the connection firm and the assembly convenient. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model; Figure 3 This is a schematic diagram of the structure of this utility model; Figure 4 This is a schematic diagram of the structure of this utility model; Figure 5 This is a schematic diagram of the structure of the plastic connector of this utility model; Figure 6 This is a schematic diagram of the structure of the fixing block of this utility model; Figure 7 This is a schematic diagram of the structure of the fixing block of this utility model; In the diagram: 1-Plastic connector, 2-Fixing block, 3-Spring tube, 4-Positioning pin, 5-Positioning hole, 6-First gas channel, 7-Second gas channel, 8-Movement fixing hole, 9-Connecting groove, 10-Plastic watch case, 11-Plastic watch cover, 12-Hand, 13-Screw, 14-Mounting hole, 15-Screw hole, 16-Dial, 17-Movement retaining pin, 18-Movement. Detailed Implementation

[0012] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the following description, in conjunction with specific illustrations, further elaborates on this utility model.

[0013] In the description of this utility model, it should be understood that the terms "one end", "the other end", "outer side", "upper", "inner side", "horizontal", "coaxial", "center", "end", "length", "outer end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0014] Combined with appendix Figures 1 to 7 As shown, this embodiment discloses a lightweight and low-cost pressure gauge, including a plastic connector 1, a fixing block 2, and a Bourdon tube 3. The fixing block 2 is installed on the plastic connector 1 and is fixedly connected to one end of the Bourdon tube 3. A first gas channel 6 is provided inside the plastic connector 1, and a second gas channel 7 is provided on the fixing block 2. The lower inlet end of the second gas channel 7 is connected to the outlet end of the first gas channel 6 inside the plastic connector 1, and the outlet end of the second gas channel 7 is connected to the cavity inside the Bourdon tube 3.

[0015] The plastic connector 1 is provided with a positioning post 4, the outlet end of the first gas channel 6 passes through the center of the positioning post 4, the fixing block 2 is provided with a positioning hole 4, the inlet end of the second gas channel 7 is connected to the positioning hole 5, and the positioning post 4 and the positioning hole 5 are connected to each other during assembly.

[0016] An O-ring is provided inside the positioning hole 5, and the O-ring is located between the upper end face of the positioning post 4 and the top surface of the positioning hole 5. The O-ring increases the sealing at the connection between the first gas channel 6 of the plastic connector 1 and the second gas channel 7 of the fixing block 2, preventing air leakage during use.

[0017] A connecting groove 9 is provided on one side of the fixing block 2. The outlet end of the second gas channel 7 is connected to the connecting groove 9. One end of the spring tube 3 is fixed in the connecting groove by welding. The free end of the spring tube 3 is connected to the pointer 12 using an existing connection structure.

[0018] The upper end of the plastic connector 1 is provided with a plastic watch case 10. The fixing block 2 and the spring tube 3 are disposed inside the plastic watch case 10. The plastic watch case 10 is provided with two through holes. The fixing block 2 is provided with two screw holes 15. The plastic connector 1 is provided with two mounting holes 14. During assembly, the screws 13 pass through the through holes and mounting holes 14 and are screwed into the screw holes 15 to fix the plastic watch case 10, plastic connector 1 and fixing block 2 together.

[0019] The upper part of the fixing block 2 is provided with two movement fixing holes 8. The core pin 17 passes through the movement 18 and the dial 16 and fixes the fixing block 2, the movement 18 and the dial 16 together through the movement fixing holes 8. The movement 18 is located below the dial 16. The movement 18 is provided with a gear transmission linkage mechanism. One end of the gear transmission linkage mechanism is connected to the free end of the Bourdon tube 3, and the other end is connected to the gear at the lower part of the pointer 12 through a toothed fan. The structure of the above part is the prior art.

[0020] In use, the plastic connector 1 is installed on the pipe to be tested. The gas in the pipe passes through the first gas channel 6 in the plastic connector 1 and the second gas channel 7 on the fixing block 2 in sequence before entering the cavity in the spring tube 3. Under the pressure of the gas, the free end of the spring tube 3 is displaced by the pressure, and the pointer is driven to rotate through the gear linkage mechanism to indicate the gas pressure value.

[0021] The air inlet connector of this utility model is made of plastic instead of copper, which reduces the weight of the pressure gauge and lowers the manufacturing cost of the pressure gauge. The air inlet connector will not rust. The spring tube 3 is connected to the plastic connector 1 through the fixing block 2, which effectively solves the problem that the spring tube 3 and the plastic connector 1 cannot be directly welded. The air inlet connector, the fixing block and the gauge housing are connected by screws 13, which makes the connection firm and the assembly convenient.

[0022] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the utility model. Any simple modifications, equivalent changes, or alterations made to the above embodiments based on the technical principles of the present utility model shall still fall within the scope of the technical solution of the present utility model.

Claims

1. A lightweight and low-cost pressure gauge, comprising a plastic connector (1), a fixing block (2), and a Bourdon tube (3), characterized in that: A fixing block (2) is installed on the plastic connector (1). The fixing block (2) is fixedly connected to one end of the spring tube (3). A first gas channel (6) is provided inside the plastic connector (1). A second gas channel (7) is provided on the fixing block (2). The lower end of the second gas channel (7) is connected to the outlet end of the first gas channel (6) inside the plastic connector (1). The other end of the second gas channel (7) is connected to the cavity inside the spring tube (3).

2. The lightweight and low-cost pressure gauge according to claim 1, characterized in that: The plastic connector (1) is provided with a positioning post (4), the outlet end of the first gas channel (6) passes through the center of the positioning post (4), the fixing block (2) is provided with a positioning hole (4), the inlet end of the second gas channel (7) is connected to the positioning hole (5), and the positioning post (4) and the positioning hole (5) are connected to each other.

3. The lightweight and low-cost pressure gauge according to claim 2, characterized in that: An O-ring is provided inside the positioning hole (5), and the O-ring is located between the upper end face of the positioning post (4) and the top surface of the positioning hole (5).

4. The lightweight and low-cost pressure gauge according to claim 1, characterized in that: A connecting groove (9) is provided on one side of the fixing block (2), and one end of the spring tube (3) is fixed in the connecting groove.

5. A lightweight and low-cost pressure gauge according to claim 1, characterized in that: The upper end of the plastic connector (1) is provided with a plastic watch case (10), the fixing block (2) and the spring tube (3) are provided inside the plastic watch case (10), the plastic watch case (10) is provided with a through hole, the fixing block (2) is provided with a screw hole (15), the plastic connector (1) is provided with a mounting hole (14), the screw (13) passes through the through hole and the mounting hole (14) and is screwed into the screw hole (15) to fix the plastic watch case (10), the plastic connector (1) and the fixing block (2) together.

6. A lightweight and low-cost pressure gauge according to claim 1, characterized in that: The upper part of the fixing block (2) is provided with a movement fixing hole (8). The movement pin (17) passes through the movement (18) and the dial (16) and fixes the fixing block (2), the movement (18) and the dial (16) together through the movement fixing hole (8).

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