Resistance-type differential pressure measurement sensor

Abstract

The utility model relates to the technical field of environment measurement, in particular to a resistance-type differential pressure measurement sensor, which comprises a shell plug, a core body is arranged in a shell, and an air inlet channel is arranged on the shell; a metal terminal is arranged in the plug and is used for being externally connected with an electric signal; an air inlet through hole communicated to the upper end of the core body is formed in the plug; the core body comprises a ceramic base, a thick-film resistor is arranged in the ceramic base, and air holes are formed in the upper end and the lower end of the ceramic base; a copper foil circuit is pre-printed in the ceramic base; according to the utility model, the thick-film resistor is arranged in the ceramic base, and the sealing glass is arranged, so that the thick-film resistor can be prevented from being damaged; air can enter the upper end and the lower end of the core body simultaneously, so that the thick-film resistor can collect pressure signals on two sides simultaneously, and the environment measurement effect is improved. A copper foil circuit is directly printed in the core body to replace a circuit board, so that the cost is saved; and the metal terminals and the connecting terminals are used without welding, so that the assembly process is simplified, and the use is convenient.

Description

Technical Field

[0001] This utility model relates to the field of environmental measurement technology, specifically to a resistive differential pressure measurement sensor. Background Technology

[0002] Environmental pressure difference is one of the important parameters in industrial production processes. In order to ensure safe and reliable production, differential pressure sensors are usually installed to detect the pressure difference of the environmental medium in order to monitor and control the environmental pressure.

[0003] Currently used differential pressure sensors measure ambient gas pressure from one direction using a ceramic core. (Please refer to...) Figure 7 In order to obtain the environmental pressure difference, the differential pressure sensor needs to be equipped with two cores for measurement. However, when the two cores are in use, there is a problem of asynchronous pressure signal acquisition, which affects the environmental measurement effect. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, the purpose of this utility model is to provide a resistive differential pressure measurement sensor to solve the problem of asynchronous acquisition of pressure signals when using two cores in the existing differential pressure sensor.

[0005] To achieve the above and other related objectives, this utility model provides a resistive differential pressure measurement sensor, including a housing and a plug riveted to the housing. The housing contains a core, and the housing has an air intake channel that leads to the lower end of the core. The plug has metal terminals for connecting to external electrical signals.

[0006] The plug is provided with an air inlet hole that leads to the upper end of the core.

[0007] The core includes a ceramic base, in which a thick-film resistor is provided. Both the upper and lower ends of the ceramic base are provided with pores. Ambient gas enters from the upper and lower ends of the core simultaneously and obtains two relative gas pressures through the thick-film resistor, thereby obtaining a pressure difference.

[0008] The ceramic base has a copper foil circuit pre-printed in it, which is electrically connected to a thick film resistor. The copper foil circuit has a connection terminal that extends to the upper end of the ceramic base and forms an electrical connection with a metal terminal to transmit pressure signals.

[0009] In one embodiment of the present invention, a spring is connected to the lower end of the metal terminal, and the lower end of the spring is connected to the connecting terminal.

[0010] In one embodiment of the present invention, the lower end of the plug is provided with a protruding rib, and the side end of the core is provided with a groove. After the plug is riveted to the outer shell, the protruding rib is embedded in the groove.

[0011] In one embodiment of the present invention, the upper end of the plug is provided with a protrusion, the position of which corresponds to the position of the rib.

[0012] In one embodiment of the present invention, an O-ring is provided between the lower end of the core and the outer shell.

[0013] In one embodiment of this utility model, a sealing glass is provided on the outside of the thick film resistor, the copper foil circuit is encapsulated in the sealing glass, and the connection terminals extend to the outside of the sealing glass.

[0014] As described above, the resistive differential pressure measuring sensor of this invention has the following beneficial effects:

[0015] This invention incorporates a thick-film resistor within a ceramic substrate and a sealing glass element on the outside of the resistor. The ceramic substrate and sealing glass work together to provide rigid support when ambient gas pressure is excessive, preventing damage to the thick-film resistor. Air intake functions are provided at both the top and bottom of the core, allowing ambient gas to enter simultaneously from both ends. This enables the thick-film resistor to simultaneously acquire pressure signals from both sides, thus quickly and accurately obtaining the pressure difference of the ambient gas and improving environmental measurement performance. Copper foil circuitry is directly printed within the core, replacing a circuit board and saving costs. A spring is used to connect the metal terminals and the connecting terminals, eliminating the need for soldering between the two terminals, simplifying the assembly process and making it convenient to use. Attached Figure Description

[0016] Figure 1 The diagram shown is a schematic representation of the external structure of the resistive differential pressure measuring sensor disclosed in this utility model.

[0017] Figure 2 The diagram shown is an exploded view of the resistive differential pressure measurement sensor disclosed in this utility model.

[0018] Figure 3 The diagram shown is a top view of the resistive differential pressure measurement sensor disclosed in this utility model.

[0019] Figure 4 Displayed as Figure 3 Sectional view of AA.

[0020] Figure 5 Displayed as Figure 3 A cross-sectional view of BB.

[0021] Figure 6 The diagram shows a single core used to measure the pressure difference in this invention.

[0022] Figure 7 This is a schematic diagram illustrating the use of two cores to measure the pressure difference in the prior art.

[0023] Component designation explanation

[0024] 1. Outer shell; 11. Air intake channel; 2. Plug; 21. Air intake hole; 22. Rib; 23. Protrusion; 3. Core; 31. Ceramic base; 32. Thick film resistor; 33. Air hole; 34. Copper foil circuit; 35. Groove; 36. Sealing glass; 37. Connecting terminal; 4. Metal terminal; 5. Spring; 6. O-ring. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification.

[0026] Please see Figures 1 to 7 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and are not intended to limit the scope of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of this invention, should still fall within the scope of the disclosed technical content. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of this invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of this invention.

[0027] Please see Figure 1-6 This utility model provides a resistive differential pressure measuring sensor, including a housing 1 and a plug 2 riveted to the housing 1. A core 3 is disposed within the housing 1, and an O-ring 6 is provided between the lower end of the core 3 and the housing 1. The O-ring 6 serves as a buffer during installation, reducing collisions and wear between the core 3 and the housing 1, thus protecting the core 3. The housing 1 has an air intake channel 11 leading to the lower end of the core 3; the plug 2 has metal terminals 4 for connecting to external electrical signals; and the plug 2 has an air intake hole 21 leading to the upper end of the core 3.

[0028] The lower end of the plug 2 is provided with a protruding rib 22, and the side end of the core 3 is provided with a groove 35. After the plug 2 is riveted to the outer shell 1, the protruding rib 22 is embedded in the groove 35 for locking and fixing the core 3. The upper end of the plug 2 is provided with a protrusion 23, and the position of the protrusion 23 corresponds to the position of the protruding rib 22. The position of the protrusion rib 22 can be determined by observing the position of the protrusion 23 on the plug 2 from the outside, which facilitates the installation and use of the plug 2 relative to the outer shell 1.

[0029] The core 3 includes a ceramic base 31, within which a thick-film resistor 32 is disposed. Both the upper and lower ends of the ceramic base 31 have vents 33. Ambient gas enters simultaneously from both ends of the core 3, passing through the thick-film resistor 32 to obtain two opposing gas pressures, thus generating a pressure difference. A copper foil circuit 34 is pre-printed in the ceramic base 31, electrically connecting to the thick-film resistor 32. The copper foil circuit 34 can replace a circuit board, saving costs. A connection terminal 37 is provided on the copper foil circuit 34, extending to the upper end of the ceramic base 31 and forming an electrical connection with a metal terminal 4 for transmitting pressure signals. The outer surface of the thick-film resistor 32... A sealing glass 36 is provided on the side, and the copper foil circuit 34 is encapsulated in the sealing glass 36. The connection terminal 37 extends to the outside of the sealing glass 36. This utility model sets the thick film resistor 32 in the ceramic base 31 and sets the sealing glass 36 on the outside of the thick film resistor 32. The ceramic base 31 and the sealing glass 36 work together to provide rigid support when the ambient gas pressure is too high, preventing the thick film resistor 32 from being damaged. The upper and lower ends of the core 3 are provided with air intake functions, and the ambient gas can enter the core 3 from both ends at the same time, so that the thick film resistor 32 can collect the pressure signals on both sides at the same time, thereby quickly and accurately obtaining the pressure difference of the ambient gas and improving the environmental measurement effect.

[0030] The lower end of the metal terminal 4 is connected to a spring 5, and the lower end of the spring 5 is connected to the connecting terminal 37. The spring 5 can connect and conduct between the metal terminal 4 and the connecting terminal 37, and the two terminals can be used without soldering, simplifying the assembly process and making it convenient to use.

[0031] In summary, this invention places the thick-film resistor 32 within the ceramic base 31 and provides a sealing glass 36, preventing damage to the thick-film resistor 32. Simultaneous air intake at the top and bottom of the core 3 allows the thick-film resistor 32 to simultaneously acquire pressure signals from both sides, improving environmental measurement performance. The core 3 directly prints copper foil circuitry 34, replacing the circuit board and saving costs. Soldering is eliminated between the metal terminal 4 and the connecting terminal 37, simplifying assembly and facilitating use. Therefore, this invention effectively overcomes the various shortcomings of existing technologies and possesses high industrial applicability.

[0032] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A resistive differential pressure measuring sensor, comprising a housing (1) and a plug (2) riveted to the housing (1), wherein a core (3) is provided in the housing (1), and an air inlet channel (11) is provided on the housing (1) leading to the lower end of the core (3); the plug (2) is provided with metal terminals (4) for connecting to external electrical signals; Its features are: The plug (2) is provided with an air inlet (21) that leads to the upper end of the core (3); The core (3) includes a ceramic base (31), a thick film resistor (32) is provided in the ceramic base (31), and air holes (33) are provided at both the upper and lower ends of the ceramic base (31). The ambient gas enters from the upper and lower ends of the core (3) at the same time and obtains two relative gas pressures through the thick film resistor (32), thereby obtaining a pressure difference. The ceramic base (31) is pre-printed with a copper foil circuit (34), which is electrically connected to a thick film resistor (32). The copper foil circuit (34) is provided with a connection terminal (37), which extends to the upper end of the ceramic base (31) and forms an electrical connection with the metal terminal (4) to transmit pressure signals.

2. The resistive differential pressure measuring sensor according to claim 1, characterized in that: The lower end of the metal terminal (4) is connected to a spring (5), and the lower end of the spring (5) is connected to the connecting terminal (37).

3. The resistive differential pressure measuring sensor according to claim 1, characterized in that: The lower end of the plug (2) is provided with a rib (22), and the side end of the core (3) is provided with a groove (35). After the plug (2) is riveted to the outer shell (1), the rib (22) is embedded in the groove (35).

4. The resistive differential pressure measuring sensor according to claim 3, characterized in that: The upper end of the plug (2) is provided with a protrusion (23), and the position of the protrusion (23) corresponds to the position of the rib (22) directly above it.

5. The resistive differential pressure measuring sensor according to claim 1, characterized in that: An O-ring (6) is provided between the lower end of the core (3) and the outer shell (1).

6. The resistive differential pressure measuring sensor according to claim 1, characterized in that: The thick film resistor (32) has a sealing glass (36) on its outer side, the copper foil circuit (34) is encapsulated in the sealing glass (36), and the connection terminal (37) extends to the outside of the sealing glass (36).

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