Explosion-proof pressure switch

Abstract

The utility model discloses an anti-explosion pressure switch which comprises a shell, a cover, a connecting base, a diaphragm, a lower ejector rod, a microswitch and an anti-explosion cable gland. The cover is detachably connected with one end of the shell and is used for sealing one end of the shell; the connecting base is detachably connected with the other end of the shell, and a connecting hole capable of communicating the cavity with a target pipeline is formed in the connecting base; the diaphragm covers the opening surface of one end, facing the cavity, of the connecting hole and is used for elastically sealing and separating the cavity and the connecting hole; one end of the lower ejector rod abuts against the diaphragm, and the other end of the lower ejector rod faces the connecting hole; the microswitch is fixedly arranged in the cavity, and a movable contact of the microswitch is linked with the lower ejector rod; the anti-explosion cable gland is arranged on the shell and used for leading out a wire electrically connected with the microswitch.

Description

Technical Field

[0001] This application relates to the field of fire protection equipment technology, specifically to an explosion-proof pressure switch. Background Technology

[0002] In the field of fire protection equipment technology, pressure switches are usually installed on fire-fighting liquid output pipelines to detect and provide feedback on whether fire-fighting equipment has started normally when a fire occurs. They are one of the important components of modern fire protection systems. Pressure switches used in some flammable and explosive environments need to have explosion-proof performance, reliability during long-term fire duty, set sensitivity during operation, and ease of maintenance. This case is a research and development result based on such requirements. Summary of the Invention

[0003] The purpose of this application is to provide an explosion-proof pressure switch to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: an explosion-proof pressure switch, comprising:

[0005] Shell 2 forms a cavity 203 with openings at both ends;

[0006] Cover 3 is detachably connected to one end of the housing 2 and is used to close one end of the housing 2;

[0007] A connecting base 1 is detachably connected to the other end of the housing 2. The connecting base 1 has a connecting hole 102 that can connect the cavity 203 and the target pipe.

[0008] A diaphragm 10 covers the opening of the connection hole 102 facing the cavity 203, and is used to elastically seal and separate the cavity 203 from the connection hole 102;

[0009] The lower push rod 9 is slidably disposed in the connecting base 1, with one end abutting against the diaphragm 10 and the other end facing the connecting hole 102;

[0010] A micro switch 6 is fixedly installed inside the cavity 203, and the moving contact of the micro switch 6 is linked with the lower push rod 9;

[0011] An explosion-proof gland 4 is mounted on the housing 2 and is used to lead out a wire that is electrically connected to the micro switch 6.

[0012] Furthermore, explosion-proof pressure switches also include:

[0013] Positioning element 8 is disposed in the cavity 203 and connected to the connecting base 1 to press at least one circumference of the outer edge of the diaphragm 10 onto the connecting base 1;

[0014] The positioning element 8 has a first straight hole 802 and a second straight hole 803 that are coaxially connected.

[0015] The upper push rod 7 is slidably fitted into the first straight hole 802, and one end facing the micro switch 6 passes through the second straight hole 803 and is linked with the moving contact of the micro switch 6; the diameter of the second straight hole 803 is smaller than the diameter of the first straight hole 802;

[0016] The upper push rod 7 and the lower push rod 9 are coaxially arranged and linked by the diaphragm 10.

[0017] Furthermore, the first straight hole 802 forms a tapered segment 801 with its larger end facing the diaphragm 10 at the opening end facing the connecting base 1.

[0018] Furthermore, the end of the connecting hole 102 near the diaphragm 10 expands to form a receiving cavity 103; the lower push rod 9 is slidably fitted in the receiving cavity 103.

[0019] Furthermore, a crossbeam 201 is formed at one end of the housing 2 near the cover 3, and a terminal block 501 is installed on the crossbeam 201; the terminal block 501 is used to connect the micro switch 6 and the wire respectively.

[0020] Furthermore, the outer wall of the housing 2 has a radially protruding lug 202, and the explosion-proof gland 4 is mounted on the lug 202; a wire outlet sealing plug 11 is provided between the explosion-proof gland 4 and the cavity 203.

[0021] Furthermore, a support base 804 is formed on the positioning member 8, and the micro switch 6 is fixedly installed on the support base 804.

[0022] Furthermore, the connecting base 1 also has a pipe thread section 101 that is axially aligned with the connecting hole 102 for connecting to the target pipe.

[0023] Furthermore, the upper push rod 7 is provided with a step 701 for limiting the upper push rod 7 from extending a set distance out of the second straight hole 803.

[0024] Furthermore, a countersunk hole 901 is formed at the end of the lower push rod 9 away from the diaphragm 10; sealing rings 12 are provided between the housing 2 and the cover 3, between the connecting base 1 and the explosion-proof gland 4.

[0025] The beneficial technical effects of this application are as follows: The explosion-proof pressure switch provided by this application forms a sealed cavity through the shell, cover, explosion-proof gland, diaphragm, and connecting base, thereby creating a closed protective environment for the microswitch installed in the cavity, isolating the microswitch from the external environment. This avoids the influence of the microswitch on the outside when it is activated, and has excellent explosion-proof effect. The diaphragm separates the connecting hole from the cavity, preventing the medium under the measured pressure from entering the cavity, ensuring the reliability of the microswitch and its electrical connection parts. At the same time, the diaphragm also provides the reset power for the lower push rod, so that the lower push rod can automatically reset. In this way, it can detect whether the fire protection system has started normally, as well as the time when the fire protection medium has finished spraying and when the fire protection system is in a reset state when it resumes duty. Due to the use of a purely mechanical triggering mechanism, the reliability is high. Attached Figure Description

[0026] Figure 1 This is a perspective sectional view of this application;

[0027] Figure 2 This is a front view of this application;

[0028] Figure 3 for Figure 2 DD section view;

[0029] Figure 4 This is an exploded view showing the connection relationship between the positioning component and the micro switch in this application;

[0030] In the diagram: 1. Connecting base; 101. Pipe thread section; 102. Connecting hole; 103. Receiving cavity; 2. Housing; 201. Crossbeam; 202. Lug; 203. Cavity; 3. Cover; 4. Explosion-proof gland; 5. Terminal block; 6. Micro switch; 7. Upper push rod; 701. Step; 8. Positioning element; 801. Tapered section; 802. First straight hole; 803. Second straight hole; 804. Support base; 805. Waist-shaped hole; 9. Lower push rod; 901. Countersunk hole; 10. Diaphragm; 11. Outlet sealing plug; 12. Sealing ring; 13. Bolt. Detailed Implementation

[0031] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0032] Please see Figures 1 to 4 An explosion-proof pressure switch includes a housing 2, a cover 3, a connecting base 1, a diaphragm 10, a lower push rod 9, a micro switch 6, and an explosion-proof gland 4, wherein:

[0033] The housing 2 forms a cavity 203 with open ends; the cover 3 is detachably connected to one end of the housing 2 to close one end of the housing 2; the connecting base 1 is detachably connected to the other end of the housing 2, and the connecting base 1 has a connecting hole 102 that can connect the cavity 203 and the target pipe; the diaphragm 10 covers the opening of the connecting hole 102 facing the cavity 203, and is used to elastically seal and isolate the cavity 203 from the connecting hole 102; the lower push rod 9 is slidably disposed in the connecting base 1, with one end abutting against the diaphragm 10 and the other end facing the connecting hole 102; the micro switch 6 is fixedly disposed in the cavity 203, and the moving contact of the micro switch 6 is linked with the lower push rod 9; the explosion-proof gland 4 is disposed on the housing 2 and is used to lead out the wire that is electrically connected to the micro switch 6.

[0034] According to the structure provided in this embodiment, the explosion-proof pressure switch forms a sealed cavity 203 through the housing 2, cover 3, explosion-proof gland 4, diaphragm 10, and connecting base 1, thereby creating a closed protective environment for the micro switch 6 installed in the cavity 203, isolating the micro switch 6 from the external environment. This avoids the influence of the micro switch 6 on the outside when it is activated, and has excellent explosion-proof effect. The diaphragm 10 separates the connecting hole 102 from the cavity 203, preventing the medium of the measured pressure from entering the cavity 203, ensuring the reliability of the micro switch 6 and its electrical connection parts. At the same time, the diaphragm 10 also provides the following... The reset force of the push rod 9 allows the lower push rod 9 to automatically reset, thereby putting the micro switch 6 in the reset state, which is normally open. After the fire protection system is activated, if fire protection medium enters the target pipeline, the fire protection medium will also enter the connection hole 102, pushing the lower push rod 9 upward and actuating the moving contact of the micro switch 6, putting the micro switch 6 in the energized state. In this way, it is possible to detect whether the fire protection system has started normally, as well as the time when the fire protection medium has finished spraying and the reset state when the fire protection system is restarted. Because a purely mechanical triggering mechanism is used, the reliability is high and far superior to existing technologies.

[0035] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 This explosion-proof pressure switch also includes a positioning element 8 and an upper push rod 7, wherein:

[0036] The positioning element 8 is located inside the cavity 203 and connected to the connecting base 1 to press at least one circumference of the outer edge of the diaphragm 10 onto the connecting base 1. In this way, the diaphragm 10 completes the sealing and isolation between the cavity 203 and the connecting hole 102. The positioning element 8 has a first straight hole 802 and a second straight hole 803 that are coaxially connected. The upper push rod 7 is slidably fitted into the first straight hole 802 and its end facing the micro switch 6 passes through the second straight hole 803 and is linked with the moving contact of the micro switch 6. The diameter of the second straight hole 803 is smaller than the diameter of the first straight hole 802. The upper push rod 7 and the lower push rod 9 are coaxially arranged and linked through the diaphragm 10.

[0037] According to the structure provided in this embodiment, after the explosion-proof pressure switch is installed on the target pipeline, if the fire protection system is activated and fire-fighting medium flows through the target pipeline, due to the set pressure of the fire-fighting medium, some of the fire-fighting medium enters through the connection hole 102, pushing the lower push rod 9 towards the diaphragm 10, causing the diaphragm 10 to deform towards the micro switch 6, and further pushing the upper push rod 7 towards the micro switch 6, thereby triggering the moving contact of the micro switch 6, making the micro switch 6 in the connected state. In this way, the fire control system can obtain the signal that the fire-fighting medium is sprayed normally. It can be understood that when no fire-fighting medium flows into the target pipeline, the rebound of the diaphragm 10 causes the lower push rod 9 to reset. At the same time, the upper push rod 7 loses its pushing force and, under the action of the reset spring force of the moving contact of the micro switch 6, also moves towards the lower push rod 9, thereby causing the micro switch 6 to also reset.

[0038] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The first straight hole 802 faces the opening of the connecting base 1, forming a tapered section 801 with its larger end facing the diaphragm 10. According to the structure provided in this embodiment, the tapered section 801 is used to accommodate the deformed portion of the diaphragm 10 during the elastic deformation process of the lower push rod 9, which helps to expand the portion of the diaphragm 10 that participates in elastic deformation, thereby keeping the diaphragm 10 in the optimal elastic deformation range, avoiding stress concentration, ensuring the service life of the diaphragm 10, and further improving the reliability of the entire switch.

[0039] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The end of the connecting hole 102 near the diaphragm 10 expands to form a receiving cavity 103; the lower push rod 9 is slidably disposed in the receiving cavity 103. According to the structure provided in this embodiment, since the lower push rod 9 is slidably disposed in the receiving cavity 103, on the one hand, the lower push rod 9 is prevented from coming out of the connecting hole 102, and on the other hand, by setting a suitable length of the receiving cavity 103, the initial position of the lower push rod 9 is limited, ensuring the consistency of the initial position, thereby improving the repeatability accuracy of this explosion-proof switch.

[0040] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 A crossbeam 201 is formed at one end of the housing 2 near the cover 3, and a terminal block 501 is installed on the crossbeam 201. The terminal block 501 is used to connect the micro switch 6 and the wire respectively. According to the above structure provided in this embodiment, on the one hand, the terminal block 501 can be firmly installed inside the cavity 203, which can provide excellent protection for the terminal block 501; on the other hand, it facilitates the connection operation between the wire and the micro switch 6, which can improve the operational convenience at the construction site.

[0041] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The outer wall of the housing 2 has a radially protruding lug 202, and the explosion-proof gland 4 is installed on the lug 202. A wire outlet sealing plug 11 is provided between the explosion-proof gland 4 and the cavity 203. The wire outlet sealing plug 11 is used to wrap and seal the wires entering and exiting the cavity 203, thereby achieving the sealing effect of the cavity 203 against the external environment and ensuring the explosion-proof performance.

[0042] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 A support base 804 is formed on the positioning element 8, and the micro switch 6 is fixedly installed on the support base 804. In this embodiment, the support base 804 is provided with an oblong hole 805, wherein the longitudinal direction of the oblong hole 805 is consistent with the moving direction of the upper push rod 7. Thus, when the micro switch 6 is installed on the support base 804 by the bolt 13 passing through the oblong hole 805, its position can be adjusted along the oblong hole 804. After the lower push rod 9 is installed into the receiving cavity 103 and the upper push rod 7 is installed into the first straight hole 802, and the diaphragm 10 is pressed onto the connecting base 1 by the positioning element 8, and the micro switch 6 is initially fixed, the connecting base 1 is connected to the test bench. The lower push rod 9 slowly applies a pushing pressure from zero to the set pressure value until the set pressure is reached, causing the lower push rod 9 to push the upper push rod 7 toward the micro switch 6. During this process, the position of the micro switch 6 is adjusted so that it is turned on just when the pressure on the lower push rod 9 reaches the set value. Then, the bolt 13 is tightened at this position and the locking bolt 13 is sealed with anaerobic adhesive to ensure the stability of the position of the micro switch 6. This ensures the sensitivity of the explosion-proof pressure switch. Finally, the housing 2, cover 3 and explosion-proof gland 4 are assembled. It is understood that the housing 2 and cover 3, the connecting base 1 and the positioning part 8 and the connecting base 1 are all connected by fasteners, such as bolts.

[0043] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The connecting base 1 also has a pipe thread section 101 that is axially aligned with the connecting hole 102 for connecting to the target pipe, thus facilitating the connection of this explosion-proof pressure switch to the target pipe.

[0044] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The upper push rod 7 is provided with a step 701 to limit the upper push rod 7 from extending a set distance from the second straight hole 803. In this way, the displacement of the upper push rod 7 is prevented from exceeding the limit and damaging the micro switch 6, thus ensuring the reliability of this explosion-proof pressure switch.

[0045] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4A countersunk hole 901 is formed at the end of the lower push rod 9 away from the diaphragm 10, which can reduce the weight of the lower push rod 9 and make the movement of the lower push rod 9 more sensitive. A sealing ring 12 is provided between the housing 2 and the cover 3, between the connecting base 1 and the explosion-proof gland 4 to ensure the sealing of this explosion-proof pressure switch and further improve the explosion-proof capability.

[0046] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0047] In the description of this application, it should be understood that the terms "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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, and therefore should not be construed as a limitation of this application.

[0048] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0049] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An explosion-proof pressure switch characterized by comprising: include: The shell (2) forms a cavity (203) with openings at both ends; The cover (3) is detachably connected to one end of the housing (2) and is used to close one end of the housing (2); The connecting base (1) is detachably connected to the other end of the housing (2), and the connecting base (1) has a connecting hole (102) that can connect the cavity (203) and the target pipe. A diaphragm (10) covers the opening of the connecting hole (102) facing the cavity (203) and is used to elastically seal and separate the cavity (203) from the connecting hole (102). The lower push rod (9) is slidably disposed in the connecting base (1), with one end abutting against the diaphragm (10) and the other end facing the connecting hole (102). A micro switch (6) is fixedly installed inside the cavity (203), and the moving contact of the micro switch (6) is linked with the lower push rod (9); An explosion-proof gland (4) is provided on the housing (2) for leading out a wire that is electrically connected to the micro switch (6).

2. The explosion-proof pressure switch according to claim 1, characterized in that Also includes: A positioning element (8) is disposed in the cavity (203) and connected to the connecting base (1) to press at least one circumference of the outer edge of the diaphragm (10) onto the connecting base (1); The positioning member (8) has a first straight hole (802) and a second straight hole (803) that are coaxially connected. The upper push rod (7) is slidably fitted into the first straight hole (802) and its end facing the micro switch (6) passes through the second straight hole (803) and is linked with the moving contact of the micro switch (6); the diameter of the second straight hole (803) is smaller than the diameter of the first straight hole (802); The upper push rod (7) and the lower push rod (9) are coaxially arranged and linked through the diaphragm (10).

3. The explosion-proof pressure switch of claim 2, wherein: The first straight hole (802) forms a tapered section (801) with its large end facing the diaphragm (10) at the opening end facing the connecting base (1).

4. The explosion-proof pressure switch of claim 2, wherein: The connecting hole (102) near the diaphragm (10) expands to form a receiving cavity (103); the lower push rod (9) is slidably fitted in the receiving cavity (103).

5. The explosion-proof pressure switch of claim 1, wherein: A crossbeam (201) is formed at one end of the housing (2) near the cover (3), and a terminal block (501) is installed on the crossbeam (201); the terminal block (501) is used to connect the micro switch (6) and the wire respectively.

6. The explosion-proof pressure switch of claim 2, wherein: The outer wall of the housing (2) has a radially protruding lug (202), and the explosion-proof gland (4) is mounted on the lug (202); a wire outlet sealing plug (11) is provided between the explosion-proof gland (4) and the cavity (203).

7. The explosion-proof pressure switch of claim 6, wherein: A support base (804) is formed on the positioning member (8), and the micro switch (6) is fixedly installed on the support base (804).

8. The explosion-proof pressure switch of claim 5, wherein: The connecting base (1) also has a pipe thread section (101) that is axially aligned with the connecting hole (102) for connecting to the target pipe.

9. The explosion-proof pressure switch of claim 2, wherein: The upper push rod (7) is provided with a step (701) for limiting the upper push rod (7) from extending a certain distance out of the second straight hole (803).

10. The explosion-proof pressure switch of claim 2, wherein: The lower top rod (9) is formed with a counterbore (901) at one end away from the diaphragm (10); the shell (2) and the cover (3), the connecting base (1) and the explosion-proof Luer (4) are all provided with sealing rings (12).

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