Double-inlet differential pressure switch

Abstract

The utility model discloses a double-inlet differential pressure switch, which comprises a switch body, a contact fixing box and a junction box, two medium channels and a pressure diaphragm are arranged in the switch body, a connecting structure is arranged on the outer side of the switch body, and the switch body is detachably connected with a pressure test point through the connecting structure; the contact fixing box comprises a first differential pressure contact, a common contact and a second differential pressure contact, and the common contact is connected with the middle of the pressure diaphragm through an insulating rod; the junction box comprises a first terminal, a common end and a second terminal, the first terminal is conducted with the first differential pressure contact, the common end is conducted with the common contact, and the second terminal is conducted with the second differential pressure contact. And the pressure diaphragm can move outwards or inwards under the action of the pressure difference of the media in the two channels to drive the common contact to move, so that the common end is conducted with the second terminal or the first terminal. Therefore, the pressure detection signal output is stable, the electrical output quality is improved, the output failure rate is reduced, and the equipment operation efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of differential pressure switch technology, and in particular to a dual-inlet differential pressure switch. Background Technology

[0002] Existing screw-in dual-inlet differential pressure switches contain electronic components for pressure handling. During use, these components are susceptible to voltage fluctuations, leading to frequent malfunctions. This may be due to instability of the electronic components in certain operating environments, causing signal output disorder. This, in turn, leads the control system to read incorrect signals and implement incorrect control, negatively impacting equipment stability and production output. Furthermore, existing screw-in dual-inlet differential pressure switches are non-explosion-proof products, limiting their application to non-explosion-proof environments. Utility Model Content

[0003] To address the aforementioned shortcomings, the technical problem to be solved by this utility model is to provide a dual-inlet differential pressure switch, which provides a stable pressure detection signal output, improves electrical output quality, reduces output failure rate, and increases equipment operating efficiency, and can be applied to various environments.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows:

[0005] A dual-inlet differential pressure switch includes a switch body. The switch body contains a first medium channel, a second medium channel located in the middle of the first medium channel, and a pressure diaphragm. The pressure diaphragm is located at the inner openings of both the first and second medium channels. The pressure diaphragm is fixedly sealed at the inner opening of the second medium channel. The switch body has a connecting structure, at least one first medium inlet, and at least one second medium inlet on its outer side. The switch body is detachably connected to a pressure test point via the connecting structure. Each first medium inlet communicates with a first medium channel, and all first medium inlets are arranged circumferentially around the switch body. The second medium inlet communicates with the first medium channel. Two media channels are connected, with the second media channel located at the end of the switch body. The switch also includes a contact fixing box and a junction box. The contact fixing box is located at the end of the switch body away from the second media inlet. The contact fixing box includes a first differential pressure contact, a common contact, and a second differential pressure contact. The common contact is connected to the pressure diaphragm via an insulating rod. The junction box is located at the end of the contact fixing box away from the switch body. The junction box includes a terminal block, which includes a first terminal, a common terminal, and a second terminal. The first terminal is connected to the first differential pressure contact, the common terminal is connected to the common contact, and the second terminal is connected to the second differential pressure contact.

[0006] In a preferred embodiment, a plurality of first medium inlets are provided on the outer side of the switch body, and all the first medium inlets are arranged evenly.

[0007] In a preferred embodiment, a sealing ring is provided at one end of the switch body where the second medium inlet is located.

[0008] In a preferred embodiment, the connection structure is a first external thread located on the outside of the switch body, and the switch body is detachably connected to the pressure test point via the first external thread.

[0009] In a preferred embodiment, the junction box further includes an explosion-proof cover, and a second external thread is provided at one end of the junction box away from the contact fixing box. The junction box is threadedly connected to the explosion-proof cover through the second external thread.

[0010] In a preferred embodiment, the junction box is further provided with a wire inlet, and the inner side of the wire inlet is provided with an internal thread.

[0011] In a preferred embodiment, a flexible insulated wire is used between the first terminal and the first differential pressure contact, between the common terminal and the common contact, and between the second terminal and the second differential pressure contact.

[0012] The beneficial effects of this utility model after adopting the above technical solution are:

[0013] This utility model's dual-inlet differential pressure switch includes a switch body. The switch body contains a first medium channel, a second medium channel, and a pressure diaphragm. The pressure diaphragm is located at the inner opening of the first and second medium channels and is fixedly sealed at the inner opening of the second medium channel. The switch body has a connecting structure, at least one first medium inlet, and at least one second medium inlet on its outer side. The switch body is detachably connected to a pressure test point via the connecting structure. All first medium inlets are arranged circumferentially around the switch body. The second medium channel is located at the end of the switch body. The switch also includes a contact fixing box and a junction box. The contact fixing box is located at the end of the switch body away from the second medium inlet. The contact fixing box includes a first differential pressure contact, a common contact, and a second differential pressure contact. The common contact is connected to the pressure diaphragm via an insulating rod. The junction box is located at the end of the contact fixing box away from the switch body. The junction box includes a terminal block, which includes a first terminal, a common terminal, and a second terminal. The first terminal is connected to the first differential pressure contact, the common terminal is connected to the common contact, and the second terminal is connected to the second differential pressure contact. When the medium pressures in the first and second medium channels differ, the pressure diaphragm moves outward or inward under the pressure difference. This movement, via the insulating rod, causes the common contact to move outward or inward, bringing the common terminal into contact with either the second or first terminal, thus enabling the detection of the medium pressure in both channels. This invention provides a stable pressure detection signal output, improving electrical output quality, reducing output failure rate, and increasing equipment operating efficiency. It can be applied to various environments and also boasts advantages such as simple structure, low cost, and ease of implementation. Attached Figure Description

[0014] Figures 1-3 This is a three-dimensional structural diagram of the dual-inlet differential pressure switch in this utility model;

[0015] Figure 4 This is a front view of the dual-inlet differential pressure switch in this utility model;

[0016] Figure 5 yes Figure 4 Cross-sectional view along the AA direction;

[0017] Figure 6 This is a structural schematic diagram of an embodiment;

[0018] Figure 7 This is a structural schematic diagram of the contact fixing box and the junction box in the embodiment;

[0019] Figure 8 This is a schematic diagram of the switch body in the embodiment;

[0020] In the diagram: 1-Switch body, 101-First medium inlet, 102-Second medium inlet, 103-Sealing ring, 104-First external thread, 105-Pressure diaphragm, 106-First medium channel, 107-Second medium channel, 2-Contact fixing box, 201-First differential pressure contact, 202-Common contact, 203-Second differential pressure contact, 204-Soft insulated wire, 3-Junction box, 300-Terminal block, 301-First terminal, 302-Second terminal, 303-Common terminal, 304-Second external thread, 305-Internal thread, 306-Inlet, 4-Insulating rod. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] It should be noted that in the description of this utility model, the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this utility model.

[0023] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0024] like Figures 1 to 8 As shown, a dual-inlet differential pressure switch includes a switch body 1. The switch body 1 contains a first medium channel 106, a second medium channel 107 located in the middle of the first medium channel 106, and a pressure diaphragm 105. The pressure diaphragm 105 is located at the inner opening of the first medium channel 106 and the second medium channel 107. Specifically, the first medium channel 106 and the second medium channel 107 are two independent pressure channels. The interface between the first medium channel 106 and the second medium channel 107 is located at the pressure diaphragm 105. The pressure diaphragm 105 is firmly and sealed around the end of the second medium channel 107. The pressure diaphragm 105 functions to sense the pressure difference between the first medium channel 106 and the second medium channel 107.

[0025] The switch body 1 has connecting structures on its outer side. The switch body 1 is detachably connected to the pressure test point through the connecting structures. In this embodiment, the connecting structure is a first external thread 104 on the outer side of the switch body 1. The switch body 1 is detachably connected to the pressure test point through the first external thread 104. The length, type, and distance of the first external thread 104 from the second medium pressure inlet can be set according to actual needs.

[0026] At least one first medium inlet 101 is provided on the outside of the switch body 1. Each first medium inlet 101 is connected to the first medium channel 106. All first medium inlets 101 are arranged around the switch body 1. In this embodiment, multiple first medium inlets 101 are provided on the outside of the switch body 1. All first medium inlets 101 are evenly arranged.

[0027] A second medium inlet 102 is provided on the outer side of the switch body 1, and the second medium inlet 102 communicates with a second medium channel 107, which is located at the end of the switch body 1. In a preferred embodiment, a sealing ring 103 is provided inside the end of the switch body 1 where the second medium inlet 102 is located. Specifically, the sealing ring 103 is located at the front end of the switch body 1, and when the present invention is tightened at the pressure test point, it serves to seal the pressure of the second medium inlet 102.

[0028] The dual-inlet differential pressure switch of this utility model also includes a contact fixing box 2 and a junction box 3.

[0029] like Figure 6 and Figure 7 As shown, the contact fixing box 2 is located at the end of the switch body 1 away from the second medium inlet 102, that is, the contact fixing box 2 and the second medium inlet 102 are respectively located at both ends of the switch body 1. The contact fixing box 2 includes a first differential pressure contact 201, a common contact 202, and a second differential pressure contact 203. The common contact 202 is connected to the pressure diaphragm 105 in the middle through the insulating rod 4. When the medium pressure in the second medium channel 107 is high, the common contact 202 is pushed outward, that is, the common contact 202 contacts the second terminal 302. Similarly, when the medium pressure in the first medium channel 106 is high, the common contact 202 is pressed inward, that is, the common contact 202 contacts the first terminal 301. Through the above two switching, the pressure signal of the pressure test point can be reliably detected.

[0030] like Figure 6 and Figure 7As shown, the junction box 3 is located at the end of the contact fixing box 2 away from the switch body 1. The junction box 3 includes a terminal block 300, which includes a first terminal 301, a common terminal 303, and a second terminal 302. The first terminal 301 is connected to the first differential pressure contact 201, the common terminal 303 is connected to the common contact 202, and the second terminal 302 is connected to the second differential pressure contact 203. In this embodiment, a flexible insulated wire 204 connects the first terminal 301 to the first differential pressure contact 201, the common terminal 303 to the common contact 202, and the second terminal 302 to the second differential pressure contact 203.

[0031] In this embodiment, the junction box 3 also includes an explosion-proof cover. A second external thread 304 is provided at the end of the junction box 3 facing away from the contact fixing box 2, and the junction box 3 is threadedly connected to the explosion-proof cover via the second external thread 304. The junction box 3 also has a wire inlet 306, and an internal thread 305 is provided on the inner side of the wire inlet 306. The threaded connection increases the sealing performance. Therefore, this utility model, by designing an explosion-proof electrical junction box 3, expands the scope of application, avoids the need to find other complex differential pressure detection methods due to the differential pressure switch not being explosion-proof, and simplifies the process.

[0032] like Figures 1 to 8 As shown in the figure, the present invention mainly improves the internal structure of the switch body 1. A second medium inlet 102 is provided at the front end, and a first medium inlet 101 is provided on the side. The pressure element adopts a pressure diaphragm 105. When the side with higher pressure presses the pressure diaphragm 105, the insulating rod 4 connected to the pressure diaphragm 105 moves with the common contact 202. Finally, the common end 303 touches the first terminal 301 or the second terminal 302, conducts the external active signal, and realizes the signal output.

[0033] By replacing the electrical components with passive contacts, only an external active signal needs to be connected. After the differential pressure is converted by the pressure diaphragm 105, the common contact 202 is connected to either the first differential pressure contact 201 or the second differential pressure contact 203, thereby providing a differential pressure signal. This improves the electrical output quality of this invention, reduces the output failure rate, and thus improves the operating efficiency of the equipment.

[0034] When this utility model is screwed into the position to be detected through the first external thread 104, the pressure of the first medium inlet 101 and the pressure of the second medium inlet 102 enter the pressure medium respectively. The pressure medium generates a pressure difference at the pressure diaphragm 105. The pressure diaphragm 105 drives the common contact 202 to move outward or inward to the right, thereby connecting the first differential pressure contact 201 and the common contact 202, or connecting the second differential pressure contact 203 and the common contact 202, and thus providing a differential pressure signal to the control system.

[0035] As can be seen, the dual-inlet differential pressure switch of this utility model has a stable pressure detection signal output, improves the electrical output quality, reduces the output failure rate, and improves the operating efficiency of the equipment. It can be applied to a variety of environments and also has the advantages of simple structure, low cost and easy implementation.

[0036] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications or improvements to the same dual-inlet differential pressure switch structure made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A dual-inlet differential pressure switch, comprising a switch body, wherein the switch body is provided with a first medium channel, a second medium channel disposed in the middle of the first medium channel, and a pressure diaphragm, the pressure diaphragm being disposed at the inner opening of the first medium channel and the second medium channel; characterized in that, The pressure diaphragm is fixedly sealed at the inner opening of the second medium channel; the outer side of the switch body is respectively provided with a connection structure, at least one first medium inlet and a second medium inlet; The switch body is detachably connected to the pressure test point via the connection structure. Each of the first medium inlets is connected to the first medium channel, and all the first medium inlets are arranged circumferentially around the switch body; The second medium inlet is connected to the second medium channel, which is located at the end of the switch body; The switch also includes a contact fixing box and a junction box; The contact fixing box is located at one end of the switch body away from the second medium inlet. The contact fixing box includes a first differential pressure contact, a common contact, and a second differential pressure contact. The common contact is connected to the pressure diaphragm in the middle through an insulating rod. The junction box is located at one end of the contact fixing box away from the switch body. The junction box includes a terminal block, which includes a first terminal, a common terminal, and a second terminal. The first terminal is connected to the first differential pressure contact, the common terminal is connected to the common contact, and the second terminal is connected to the second differential pressure contact.

2. The dual-inlet differential pressure switch according to claim 1, characterized in that, The outer side of the switch body is provided with multiple first medium inlets, and all the first medium inlets are evenly arranged.

3. The dual-inlet differential pressure switch according to claim 1, characterized in that, A sealing ring is provided at one end of the switch body where the second medium inlet is located.

4. The dual-inlet differential pressure switch according to claim 1, characterized in that, The connection structure is a first external thread on the outside of the switch body, and the switch body is detachably connected to the pressure test point through the first external thread.

5. The dual-inlet differential pressure switch according to claim 1, characterized in that, The junction box also includes an explosion-proof cover. The end of the junction box opposite to the contact fixing box is provided with a second external thread, and the junction box is threadedly connected to the explosion-proof cover through the second external thread.

6. The dual-inlet differential pressure switch according to claim 5, characterized in that, The junction box is also provided with a wire inlet, and the inside of the wire inlet is provided with an internal thread.

7. The dual-inlet differential pressure switch according to claim 1, characterized in that, The first terminal and the first differential pressure contact, the common terminal and the common contact, and the second terminal and the second differential pressure contact are connected by a soft insulated wire.

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