High-precision density pressure switch

Abstract

The utility model discloses a high-precision density pressure switch, which comprises a shell assembly, and the shell assembly comprises a stainless steel shell, a stainless steel glass glaze sintering base arranged on the bottom surface of the stainless steel shell, and a stainless steel base welded with the stainless steel shell. And a pressure switch assembly. According to the utility model, through mutual cooperation of the housing assembly and the pressure switch assembly, pressure and temperature are measured by using an electronic measurement method, the sensitivity and the measurement precision are high, alarm and locking actions are judged after conversion into equivalent values, self-inspection judgment and fault contact output are realized, and a high-precision density pressure switch adopts a high-precision pressure and temperature sensor, so that the pressure and the temperature can be measured more accurately. Pressure and temperature are sampled at the same time, an equivalent pressure value is obtained after calculation, false alarm caused by temperature change is avoided, three paths of relay output are built in, fault self-detection can be achieved, fault contact output is achieved, and safety and reliability are achieved; the whole body is made of stainless steel and metal, epoxy pouring is carried out at the inserting pieces, the sealing performance is good, the anti-interference performance is good, and the precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure switches, in particular to a high-precision density pressure switch. Background Art

[0002] There are no density switches on the market now, only mechanical pressure switches, which have low accuracy and cannot perform temperature compensation for pressure. The gas pressure in the sealed gas chamber will change when the temperature changes, and the mechanical pressure switch is prone to false alarms.

[0003] The existing high-voltage circuit breakers now use mechanical pressure switches, which have a simple structure and a disadvantage of no temperature compensation. When there is no leakage in the equipment filled with SF6 gas, temperature changes will cause pressure changes. If the ambient temperature drops, the pressure will drop; conversely, if the ambient temperature rises, the pressure will rise. In the absence of temperature compensation, if the equipment leaks but the ambient temperature is high, the mechanical pressure switch will still indicate normal pressure; if the equipment does not leak but the ambient temperature is low, the gas pressure will be lower than the specified pressure, and the mechanical pressure switch will malfunction. Summary of the invention

[0004] Therefore, the purpose of the utility model is to provide a high-precision density pressure switch. Through the mutual cooperation of the shell component and the pressure switch component, the high-precision density pressure switch adopts high-precision pressure and temperature sensors. The pressure and temperature are sampled simultaneously, and the equivalent pressure value is obtained after calculation. No false alarm will be generated due to temperature changes. It has a built-in 3-way relay output, can self-check faults and have fault contact outputs, which is safe and reliable; the one-piece stainless steel metal shell has good anti-interference performance and high precision.

[0005] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solution: a high-precision density pressure switch, comprising:

[0006] A shell assembly, the shell assembly comprising a stainless steel shell, a stainless steel glass glaze sintered base arranged on the bottom surface of the stainless steel shell, and a stainless steel base welded to the stainless steel shell;

[0007] A pressure switch assembly comprises a metal wiring plug arranged on the top of the stainless steel shell, a circuit board connected to the stainless steel glass glaze sintered base, and a pressure sensor arranged in the stainless steel glass glaze sintered base.

[0008] As a preferred solution of the high-precision density pressure switch described in the utility model, the pressure switch assembly further includes an epoxy seal for sealing the metal wiring plug and the stainless steel housing.

[0009] As a preferred solution of the high-precision density pressure switch described in the utility model, the circuit board and the stainless steel glass glaze sintered base are fixed by welding with lead welding pins.

[0010] As a preferred solution of the high-precision density pressure switch described in the utility model, the pressure switch assembly further includes a power indicator light;

[0011] Wherein, the power indicator light is arranged at the epoxy sealing position.

[0012] As a preferred solution of the high-precision density pressure switch described in the utility model, the pressure switch assembly further includes an O-ring arranged at the outer ring position of the stainless steel glass glaze sintered base;

[0013] Wherein, the O-ring is pressed into the stainless steel base.

[0014] As a preferred solution of the high-precision density pressure switch described in the utility model, the pressure switch assembly further includes a clamping ring;

[0015] Wherein, the clamping ring presses the O-ring.

[0016] Compared with the prior art, the advantages of the utility model are:

[0017] Through the cooperation of the shell assembly and the pressure switch assembly, the pressure and temperature are measured by electronic measurement methods. It has high sensitivity and measurement accuracy. After conversion to equivalent values, the alarm and locking actions are judged. It has self-check judgment and fault contact output. The high-precision density pressure switch adopts high-precision pressure and temperature sensors. The pressure and temperature are sampled at the same time, and the equivalent pressure value is obtained after calculation. There will be no false alarm due to temperature changes. It has built-in 3-way relay output, can self-check faults and have fault contact outputs, which is safe and reliable. The whole is made of stainless steel metal, and the insert is epoxy cast, with good sealing performance, good anti-interference performance and high precision. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the implementation of the utility model, the utility model will be described in detail below in combination with the drawings and detailed implementation. Obviously, the drawings described below are only some implementations of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0019] Figure 1 It is a structural diagram of the utility model;

[0020] Figure 2 This is a system block diagram of the utility model;

[0021] Figure 3 This is a circuit schematic diagram of the utility model.

[0022] In the figure: 11, stainless steel housing; 12, stainless steel glass glaze sintered base; 13, stainless steel base; 21, epoxy seal; 22, circuit board; 23, clamping ring; 24, O-ring; 25, pressure sensor; 26, metal wiring plug; 27, power indicator light. DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below with reference to the accompanying drawings.

[0024] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation methods disclosed below.

[0025] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the implementation of the present invention, for the sake of convenience, the cross-sectional diagram showing the device structure will not be partially enlarged according to the general scale, and the schematic diagram is only an example, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0026] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] The utility model provides a high-precision density pressure switch. Through the cooperation of the shell component and the pressure switch component, the high-precision density pressure switch adopts high-precision pressure and temperature sensors. The pressure and temperature are sampled simultaneously, and the equivalent pressure value is obtained after calculation. No false alarm is generated due to temperature changes. The utility model has built-in 3-way relay output, can self-check faults and have fault contact outputs, and is safe and reliable. The one-piece stainless steel metal shell has good anti-interference performance and high precision.

[0028] Figure 1 , Figure 2 , Figure 3 The figure shows the overall structure of an embodiment of the high-precision density pressure switch of the utility model. Figure 1 , Figure 2 , Figure 3 The main structure of this embodiment includes: a housing assembly and a pressure switch assembly.

[0029] The housing assembly is integrally formed and used to install the pressure switch assembly. Specifically, the housing assembly includes a stainless steel housing 11, a stainless steel glass glaze sintered base 12 arranged on the bottom surface of the stainless steel housing 11, and a stainless steel base 13 welded to the stainless steel housing 11;

[0030] In specific use, the one-piece stainless steel metal shell has good anti-interference performance and high precision, and the pressure switch assembly is installed and used based on the stainless steel shell 11, the stainless steel glass glaze sintered base 12 and the stainless steel base 13.

[0031] The pressure switch assembly is used to form a high-density pressure switch. Specifically, the pressure switch assembly includes a metal wiring plug 26 arranged at the top of the stainless steel housing 11, a circuit board 22 connected to the stainless steel glass glaze sintered base 12, and a pressure sensor 25 arranged in the stainless steel glass glaze sintered base 12; the pressure switch assembly also includes a power indicator light 27; wherein the power indicator light 27 is arranged at the position of the epoxy seal 21, and the pressure switch assembly also includes an epoxy seal 21 that seals the metal wiring plug 26 with the stainless steel housing 11; the circuit board 22 and the stainless steel glass glaze sintered base 12 are welded and fixed by a lead welding pin; the pressure switch assembly also includes an O-ring 24 arranged at the outer ring position of the stainless steel glass glaze sintered base 12; wherein the O-ring 24 is pressed into the stainless steel base 13; the pressure switch assembly also includes a clamping ring 23; wherein the clamping ring 23 clamps the O-ring 24;

[0032] During specific use, the working power supply is DC9V~DC30V, which is powered by an external power supply. The pressure sensor 25 is a MEMS electronic pressure and temperature sensor. The data output mode of the pressure sensor 25 is I2C bus. The central processing unit reads the pressure value and temperature value measured by the sensor through the I2C bus, and obtains the corresponding gas pressure value and gas temperature value after conversion, and then converts the equivalent pressure value. After comparing the alarm value and the lock value, the relay makes a corresponding action output; with a self-test function, after the internal self-test finds a fault, the fault relay will act and output, the MEMS electronic pressure and temperature sensor is welded on the circuit board 22, the circuit board 22 is welded and fixed to the lead welding pin of the stainless steel glass glaze sintered base 12, and a matching O-ring is installed on the outer ring of the stainless steel glass glaze sintered base 12. 24 is pressed into the stainless steel base 13 and tightened with a clamping ring 23. The welding pins of the stainless steel glass glaze sintered base 12 are welded to the corresponding welding points of the circuit board 22 and fix the circuit board 22; the stainless steel shell 11 and the stainless steel base 13 are welded together, and the MEMS electronic pressure and temperature sensor is fixed and isolated by the stainless steel glass glaze sintered base 12, which not only ensures the sealing performance, but also ensures good electrical connection reliability. The relay output is connected to the power input sampling metal wiring plug 26, and the plug welding circuit board 22 and the shell are sealed with epoxy 21. The density pressure switch has a small size, good sealing performance, high precision, low power consumption, sensitive response, and good anti-interference performance. Since the temperature sensor and the pressure sensor 25 are combined together, the measured gas temperature data is closer to the actual temperature value of the gas.

[0033] Although the present invention has been described above with reference to the embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the various features in the embodiments disclosed in the present invention may be used in combination with each other in any manner, and the fact that these combinations are not exhaustively described in this specification is only for the sake of omitting space and saving resources. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. High-precision density pressure switch, characterized in that: include: A shell assembly, the shell assembly comprising a stainless steel shell (11), a stainless steel glass glaze sintered base (12) arranged on the bottom surface of the stainless steel shell (11), and a stainless steel base (13) welded to the stainless steel shell (11); A pressure switch assembly, the pressure switch assembly comprising a metal wiring plug (26) arranged at the top of the stainless steel housing (11), a circuit board (22) connected to the stainless steel glass glaze sintered base (12), and a pressure sensor (25) arranged in the stainless steel glass glaze sintered base (12).

2. The high-precision density pressure switch according to claim 1, characterized in that: The pressure switch assembly also includes an epoxy seal (21) that seals the metal terminal insert (26) to the stainless steel housing (11).

3. The high-precision density pressure switch according to claim 2, characterized in that: The circuit board (22) and the stainless steel glass glaze sintered base (12) are fixed by welding via lead welding pins.

4. The high-precision density pressure switch according to claim 3, characterized in that: The pressure switch assembly also includes a power indicator light (27); Wherein, the power indicator light (27) is arranged at the position of the epoxy seal (21).

5. The high-precision density pressure switch according to claim 4, characterized in that: The pressure switch assembly further comprises an O-type sealing ring (24) arranged at an outer ring position of the stainless steel glass glaze sintered base (12); The O-ring (24) is pressed into the stainless steel base (13).

6. The high-precision density pressure switch according to claim 5, characterized in that: The pressure switch assembly also includes a clamping ring (23); The pressing ring (23) presses the O-ring (24).

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