Prestress ring and pressure transmitter comprising same

Abstract

The utility model relates to a pre-stress ring and a pressure transmitter comprising the pre-stress ring, which are mainly used for measuring the pressure of a fluid medium in test systems in the industries of pressure sensing, refrigeration, heating and ventilation and the like. The utility model provides a pre-stress ring, which is used in a pressure transmitter and is directly or indirectly pressed on a core body in the pressure transmitter, and comprises a pre-stress ring body and a pre-stress ring, the ventilation pipe is formed on the prestress ring body and used for being communicated with an air pipe of the pressure transmitter so as to achieve communication between an inner core body of the pressure transmitter and the external atmosphere. According to the utility model, the ventilation pipe communicated with the air pipe of the pressure transmitter is arranged on the pre-stress ring body, so that the core body in the pressure transmitter is communicated with the external atmosphere, and the normal work of the core body is ensured. Besides, the air pipes are connected through the ventilation pipes, so that air entering the cavity does not directly face the PCB any more, and the influence of moisture in the air entering the cavity through the air pipes on the PCB can be reduced.

Description

[0001] This application is a divisional application. The application number of the original application is 2023232350075, the application date is November 29, 2023, and the invention-creation name is "Prestressed Ring and Pressure Transmitter Comprising the Same". Technical Field

[0002] The utility model relates to a prestressed ring and a pressure transmitter comprising the prestressed ring, which are mainly used for measuring the pressure of fluid media in test systems such as pressure sensing, refrigeration, and HVAC industries. Background Art

[0003] As Figure 1 shown, the existing pressure transmitter products include a base 10, a ceramic core 11 disposed inside the base 10, a prestressed ring 12 disposed on the upper surface of the ceramic core 11, a threaded compression ring 13 for pressing the prestressed ring 12 against the upper surface of the ceramic core 11, a PCB board 14 connected to the ceramic core 11 (a threaded hole is opened on the threaded compression ring 13, and the PCB board is fixed on the threaded compression ring by using an insulating tube and a screw), and a housing 16 with a waterproof connector 15. The housing 16 is installed on the base 10 to enclose the ceramic core 11, the prestressed ring 12, the threaded compression ring 13, and the PCB board 14 inside.

[0004] Its disadvantage is that the air pipe is directly opposite to the PCB board 14, and the moisture in the air entering the cavity through the air pipe will affect the PCB board. Summary of the Invention

[0005] The purpose of the utility model is to provide a prestressed ring and a pressure transmitter comprising the prestressed ring for the problems existing above.

[0006] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0007] A prestressed ring is used in a pressure transmitter and is directly or indirectly pressed against the core inside the pressure transmitter, and comprises:

[0008] A prestressed ring body;

[0009] An air vent pipe is formed on the prestressed ring body and is used for connecting with the air pipe of the pressure transmitter to realize the communication between the core inside the pressure transmitter and the external atmosphere.

[0010] The present utility model improves the existing prestressed ring. A vent pipe for communicating with the air pipe of a pressure transmitter is provided on the prestressed ring body, so that the internal core of the pressure transmitter is in communication with the external atmosphere, ensuring the normal operation of the core. In addition, by connecting the air pipe with the vent pipe, the air entering the cavity no longer directly faces the PCB board. Compared with the design in the prior art where the air pipe directly faces the PCB board, it can reduce the impact of moisture in the air entering the cavity through the air pipe on the PCB board.

[0011] Preferably, one end of the vent pipe is communicated with the air pipe of the pressure transmitter, and the other end is communicated with the cavity formed between the prestressed ring body and the core; the internal core of the pressure transmitter is in communication with the external atmosphere by means of the vent pipe and the air pipe.

[0012] A pressure transmitter, comprising:

[0013] A base;

[0014] A connector, having a connecting wire harness with an air pipe, is installed on the base, and a cavity is formed between the two;

[0015] A core, disposed in the cavity;

[0016] A PCB board, connected to the core;

[0017] A retaining ring, installed in the cavity, directly or indirectly pressing the core against the base;

[0018] The retaining ring includes:

[0019] A prestressed ring, having a prestressed ring body directly or indirectly abutted against the core, and a vent pipe formed on the prestressed ring body and communicated with the air pipe to realize the communication between the core and the external atmosphere;

[0020] A snap ring, positioned in the cavity and abutted against the prestressed ring.

[0021] The present utility model improves the existing prestressed ring. A vent pipe for communicating with the air pipe of a pressure transmitter is provided on the prestressed ring body, so that the internal core of the pressure transmitter is in communication with the external atmosphere, ensuring the normal operation of the core. In addition, by connecting the air pipe with the vent pipe, the air entering the cavity no longer directly faces the PCB board. Compared with the design in the prior art where the air pipe directly faces the PCB board, it can reduce the impact of moisture in the air entering the cavity through the air pipe on the PCB board.

[0022] Preferably, one end of the vent pipe is communicated with the air pipe, and the other end is communicated with the cavity formed between the prestressed ring body and the core; the internal core of the pressure transmitter is in communication with the external atmosphere by means of the vent pipe and the air pipe.

[0023] Preferably, the prestressed ring divides the cavity into two chambers, and sealant is poured into the chamber above the prestressed ring. In this way, most of the space in the cavity is filled with sealant. Compared with the prior art, even when used in a harsh environment, the influence of condensed water on the PCB board can be avoided.

[0024] Preferably, the connector is an injection-molded plastic part, which has an annular recess and a gasket embedded in the recess. The upper end of the base extends into the annular recess and presses against the gasket. Using an injection-molded plastic part to replace the existing waterproof connector can avoid water ingress caused by rubber corrosion in a harsh environment.

[0025] The beneficial effects of the present utility model are as follows:

[0026] 1. Improve the existing prestressed ring, and provide a vent pipe on the prestressed ring body for communicating with the air pipe of the pressure transmitter, so that the internal core of the pressure transmitter is communicated with the external atmosphere to ensure the normal operation of the core. In addition, the air pipe is connected by the vent pipe, so that the air entering the cavity no longer faces the PCB board of the pressure transmitter directly. Compared with the design in the prior art where the air pipe faces the PCB board directly, the influence of moisture in the air entering the cavity through the air pipe on the PCB board can be reduced.

[0027] 2. The prestressed ring divides the cavity into two chambers, and the air pipe of the pressure transmitter extends to the chamber below the prestressed ring through the vent pipe. In this way, filling the chamber above the prestressed ring with glue can also achieve the communication between the core and the atmosphere, and most of the space in the cavity is filled with sealant. Compared with the prior art, even when used in a harsh environment, the influence of condensed water on the PCB board can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the background art of the present utility model.

[0029] Figure 2 is a schematic structural diagram of one perspective of the prestressed ring of the present utility model.

[0030] Figure 3 is a schematic structural diagram of another perspective of the prestressed ring of the present utility model.

[0031] Figure 4 is a schematic structural diagram of the pressure transmitter of the present utility model.

[0032] Figure 5 is Figure 4 a schematic structural diagram of the prestressed ring, the core, and the PCB board in

[0033] Figure 6 is Figure 4 a top view of

[0034] In the figure, there are base 100; fluid channel 101; connector 200; recess 201; gasket 202; air tube 203; potting hole 204; vent hole 205; core body 300; PCB board 400; grounding tab 401; retaining ring 500; prestress ring body 501; vent pipe 502; first connection part 503; second connection part 504; circlip 505; gap 600. Specific embodiments

[0035] In order to make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] As Figure 2 、 Figure 3 shown, a prestress ring is used in a pressure transmitter and is directly or indirectly pressed against the core body inside the pressure transmitter. It includes:

[0037] Prestress ring body 501; in some practical applications, the end face of the prestress ring body 501 is basically circular, and the cross section is basically channel-shaped;

[0038] First connection part 503, located on the prestress ring body 501, for communication connection with the core body; in some practical applications, the first connection part 503 is a female busbar socket capable of being inserted into the core body; for the convenience of connection, in some practical applications, the first connection part 503 is located on the prestress ring body 501 and on the side facing the core body;

[0039] Second connection part 504, located on the prestress ring body 501, for communication connection and fixation with the PCB board of the pressure transmitter; in some practical applications, the second connection part 504 is a female busbar socket capable of being inserted into the PCB board; for the convenience of connection, in some practical applications, the second connection part 504 is located on the prestress ring body 501 and on the side far from the core body (the side facing the PCB board);

[0040] The first connection part 503 and the second connection part 504 are in communication connection.

[0041] In this embodiment, the existing prestressed ring is improved by providing a first connecting portion 503 and a second connecting portion 504 for communication connection. The PCB board of the pressure transmitter can achieve its communication connection with the prestressed ring and be fixed through the second connecting portion 504, and the core body can achieve its communication connection with the prestressed ring through the first connecting portion 503; that is, the prestressed ring is used to achieve the communication connection between the core body and the PCB board, and at the same time, the fixing of the PCB board is realized. The fixing of the PCB board and the communication connection between the core body and the PCB board both utilize the second connecting portion 504, and the structural design is more ingenious and the overall structure is simpler compared with the prior art. When the first connecting portion 503 is a busbar socket that can be inserted into the core body and the second connecting portion 504 is a busbar socket that can be inserted into the PCB board, the connection between the core body and the prestressed ring and the connection between the PCB board and the prestressed ring both adopt the insertion method, which is not only convenient for installation and disassembly, but also has good stability.

[0042] As a preferred implementation of this embodiment, a vent pipe 502 is further formed on the prestressed ring body 501 for communicating with the air pipe of the pressure transmitter to realize the communication between the core body inside the pressure transmitter and the external atmosphere; specifically, one end of the vent pipe 502 is communicated with the air pipe of the pressure transmitter, and the other end is communicated to the cavity formed between the prestressed ring body 501 and the core body. Since the surface of the core body cannot be pressurized and needs to be connected to the atmosphere to ensure the normal operation of the product, the vent pipe 502 is used to communicate with the air pipe of the pressure transmitter, so that the core body inside the pressure transmitter is communicated with the external atmosphere.

[0043] As Figures 2 - 6 shown, a pressure transmitter includes:

[0044] A base 100, which can be made of a metal material, and a fluid channel 101 for the fluid to be measured to enter and contact the core body 300 to realize pressure measurement is provided at the bottom thereof;

[0045] A connector 200, which is installed on the base 100 and forms a cavity therebetween;

[0046] A core body 300, which is arranged in the cavity;

[0047] A PCB board 400, which is communicatively connected to the core body 300; in some practical applications, a grounding tab 401 is electrically connected to the PCB board 400, and after the PCB board 400 is installed, the grounding tab 401 contacts the side wall of the metal base 100;

[0048] A retaining ring 500, which is installed in the cavity and directly or indirectly presses the core body 200 against the base 100 to form a gap 600 communicating with the fluid channel 101 between the base 100 and the core body 300;

[0049] The retaining ring 500 includes:

[0050] The prestress ring has a prestress ring body 501 that directly or indirectly abuts against the core body 300, a first connection portion 503 located on the prestress ring body 501 and communicatively connected to the core body 300, and a second connection portion 504 located on the prestress ring body 501 and communicatively connected to and fixed to the PCB board 400; the first connection portion 503 and the second connection portion 504 are communicatively connected; in some practical applications, the end face of the prestress ring body 501 is substantially circular and the cross-section is substantially channel-shaped; in some other practical applications, the first connection portion 503 is a busbar socket, and the core body 300 is communicatively connected to the first connection portion 503 through a pin; for the convenience of connection, in some practical applications, the first connection portion 503 is located on the prestress ring body 501 and faces the core body side; in still some other practical applications, the second connection portion 504 is a busbar socket, and the PCB board 400 is communicatively connected to and fixed to the second connection portion 504 through a pin; for the convenience of connection, in some practical applications, the second connection portion 504 is located on the prestress ring body 501 and is away from the core body side (towards the PCB board side);

[0051] The snap ring 505 is positioned within the cavity and abuts against the prestress ring.

[0052] This embodiment improves the existing prestress ring by providing the first connection portion 503 and the second connection portion 504 that are communicatively connected. The PCB board 400 can achieve its communicative connection and fixation with the prestress ring through the second connection portion 504, and the core body 300 can achieve its communicative connection with the prestress ring through the first connection portion 503; that is, the communicative connection between the core body 300 and the PCB board 400 is realized by using the prestress ring, and at the same time, the fixation of the PCB board 400 is realized. The fixation of the PCB board 400 and the communicative connection between the core body 300 and the PCB board 400 both utilize the second connection portion 504, and the structural design is more ingenious and the overall structure is simpler compared with the prior art. When the first connection portion 503 is a busbar socket that can be inserted into the core body 300 and the second connection portion 504 is a busbar socket that can be inserted into the PCB board 400, the connection between the core body 300 and the prestress ring and the connection between the PCB board 400 and the prestress ring both adopt the insertion method, which is not only convenient for installation and disassembly but also has good stability.

[0053] As a preferred implementation manner of this embodiment, when the prestress ring directly or indirectly abuts against the core body 300, the core body 300 is connected to the prestress ring through the first connection portion 503. In this way, when the prestress ring is positioned within the cavity by the snap ring 505, the core body 300 is connected to the prestress ring through the first connection portion 503, with a simple structure and convenient installation.

[0054] As another preferred embodiment of this embodiment, the connector 200 has a connecting wire harness with an air tube 203; a vent tube 502 communicating with the air tube 203 is formed on the prestressed ring body 501 to realize the communication between the core body 300 and the external atmosphere. Specifically, one end of the vent tube 502 is communicated with the air tube 203, and the other end is communicated with the cavity formed between the prestressed ring body 501 and the core body 300. Since the surface of the core body 300 cannot be pressurized and needs to be connected to the atmosphere to ensure the normal operation of the product, the vent tube 502 is connected to the air tube of the pressure transmitter, so that the core body 300 inside the pressure transmitter is communicated with the external atmosphere. In addition, by connecting the air tube 203 with the vent tube 502, the air entering the cavity no longer faces the PCB board 400 directly. Compared with the design in the prior art where the air tube faces the PCB board, the influence of the moisture in the air entering the cavity through the air tube on the PCB board can be reduced.

[0055] As still another preferred embodiment of this embodiment, the prestressed ring divides the cavity into two chambers, and a sealing glue is filled in the chamber above the prestressed ring. Figure 1 In the prior art shown, if the product is applied to a harsh environment, condensed water often appears inside the product. After a long time, the moisture accumulates in the internal space of the product, corroding the PCB board and causing damage to the components on the PCB board. In order to avoid the appearance of condensed water, sealing glue can be poured into the cavity formed by the base and the housing. However, due to the fluidity of the sealing glue itself, it will cover the upper surface of the core body under the action of gravity, isolating the core body from the external atmosphere. If the entire cavity is filled with sealing glue, the air tube in the wire harness will also be blocked, affecting the normal operation of the product. In this embodiment, the prestressed ring divides the cavity into two chambers, and the air tube 203 of the pressure transmitter extends to the chamber below the prestressed ring (the cavity formed between the prestressed ring body and the core body) through the vent tube 502. In this way, when the chamber above the prestressed ring is filled with glue, the sealing glue will not cover the core body 300. At the same time, the core body 300 is communicated with the atmosphere through the vent tube 502 and the air tube 203, ensuring the normal operation of the core body 300. In addition, most of the space in the cavity is filled with sealing glue. Compared with the prior art, even when used in a harsh environment, the influence of condensed water on the PCB board can be avoided.

[0056] The connector 200 is a plastic part formed by injection molding, having an annular recess 201 and a sealing gasket 202 embedded in the recess. The upper end of the base 100 extends into the annular recess and presses against the sealing gasket 202 to achieve the sealed connection between the base 100 and the connector 200. Using the plastic part formed by injection molding to replace the existing waterproof connector avoids water ingress caused by rubber corrosion in a harsh environment.

[0057] In the actual production process, first insert the core body 300 onto the first connecting portion 503 of the prestressed ring, and place the whole into the base 100; then place the snap ring 505 to position the prestressed ring; then place the PCB board 400 into the base 100, so that the PCB board 400 is inserted into the second connecting portion 504; then connect the air pipe 203 on the connector 200 to the ventilation pipe 502, and install the connector 200 on the base 100; finally, inject glue through the glue injection hole 204 at the end of the connector 200 until the sealant overflows from the exhaust hole 205. On the one hand, it makes the cavity above the prestressed ring filled with sealant to avoid the appearance of condensed water. On the other hand, the gluing of the sealant and the connector 200 further improves the sealing effect.

[0058] A prestressed ring, used in a pressure transmitter, directly or indirectly pressed against the core body inside the pressure transmitter, includes:

[0059] The prestressed ring body 501; in some practical applications, the end face of the prestressed ring body 501 is basically circular, and the cross section is basically channel-shaped;

[0060] The ventilation pipe 502, formed on the prestressed ring body 501, is used to communicate with the air pipe of the pressure transmitter to realize the communication between the core body inside the pressure transmitter and the external atmosphere. In some practical applications, the ventilation pipe 502 is integrally formed on the prestressed ring body 501, and the air passage therein penetrates through the prestressed ring body 501.

[0061] The utility model improves the existing prestressed ring, and a ventilation pipe 502 for communicating with the air pipe of the pressure transmitter is arranged on the prestressed ring body, so that the core body inside the pressure transmitter is communicated with the external atmosphere to ensure the normal operation of the core body. In addition, the air pipe is connected by using the ventilation pipe 502, so that the air entering the cavity no longer directly faces the PCB board of the pressure transmitter. Compared with the design in the prior art where the air pipe directly faces the PCB board, it can reduce the influence of the moisture in the air entering the cavity through the air pipe on the PCB board.

[0062] In some specific implementations, one end of the ventilation pipe 502 is communicated with the air pipe of the pressure transmitter, and the other end is communicated to the cavity formed between the prestressed ring body 501 and the core body.

[0063] The best embodiments of the utility model have been illustrated, and various changes or modifications made by those of ordinary skill in the art will not depart from the scope of the utility model.

Claims

1. A prestressed ring is used in a pressure transmitter and is directly or indirectly pressed against the core inside the pressure transmitter, and is characterized in that Comprising: A prestressed ring body (501); A vent pipe (502) formed on the prestressed ring body (501) and used to communicate with the air pipe of a pressure transmitter to achieve the communication between the internal core of the pressure transmitter and the external atmosphere.

2. The prestressed ring according to claim 1, wherein: One end of the vent pipe (502) is communicated with the air pipe of the pressure transmitter, and the other end is communicated with the cavity formed between the prestressed ring body (501) and the core.

3. A pressure transmitter, comprising: A base (100); A connector (200) having a connecting wire harness with an air pipe (203), mounted on the base (100), and forming a cavity therebetween; A core (300) disposed in the cavity; A PCB board (400) connected to the core (300); A retainer ring (500) mounted in the cavity and directly or indirectly pressing the core (300) against the base (100); Characterized in that the retainer ring (500) comprises: A prestressed ring having a prestressed ring body (501) directly or indirectly abutted against the core (300), and a vent pipe (502) formed on the prestressed ring body (501) and communicated with the air pipe (203) to achieve the communication between the core (300) and the external atmosphere; A snap ring (505) positioned in the cavity and abutting against the prestressed ring.

4. The pressure transmitter according to claim 3, characterized in that: One end of the vent pipe (502) is communicated with the air pipe (203), and the other end is communicated with the cavity formed between the prestressed ring body (501) and the core (300).

5. The pressure transmitter according to claim 3, characterized in that: The prestressed ring divides the cavity into two chambers, and a sealing glue is filled in the chamber above the prestressed ring.

6. The pressure transmitter according to claim 3, wherein: The connector (200) is an injection-molded plastic part having an annular recess (201) and a gasket (202) embedded in the recess. The upper end of the base (100) extends into the annular recess and presses against the gasket (202).

Images