Cable joint seal structure and differential pressure switch

Abstract

The application provides a cable joint sealing structure and a differential pressure switch, and belongs to the technical field of cable installation. The cable joint sealing structure comprises a sealing seat, a first sealing assembly and a second sealing assembly. The sealing seat is fixed on a mounting shell and extends along the axial direction of a first mounting hole. The sealing seat has a second mounting hole. A partition plate part is arranged in the sealing seat. The first sealing assembly is annularly arranged in the second mounting hole and is arranged above the partition plate part. The second sealing assembly is annularly arranged in the second mounting hole and is arranged below the partition plate part. The annular inner wall of the first sealing assembly and the annular inner wall of the second sealing assembly are in abutment with the outer peripheral wall of a communication cable. The annular inner wall of the partition plate part is used for being pressed against the outer peripheral wall of the communication cable. The cable joint sealing structure and the differential pressure switch can guarantee the sealing effect of the connection end of the communication cable and effectively improve the sealing performance and safety of the cable joint.

Description

Technical Field

[0001] This application belongs to the field of cable installation technology, and more specifically, relates to a cable connector sealing structure and a differential pressure switch. Background Technology

[0002] A differential pressure switch is a device that uses the pressure difference between two points in a pipeline or equipment to perform control or alarm functions. Cables are used to ensure the communication connection between the differential pressure switch and the external control system so that the signal from the differential pressure switch can be transmitted to the control system.

[0003] When cables are connected to a differential pressure switch, the cable joints must be sealed. A sealing structure at the joint isolates the cable connection from the outside, providing waterproofing and explosion-proof protection. Traditionally, cables leading out of the differential pressure switch are often aligned with the axis of the terminal hole. However, during use, the cable lead-out end needs to be tilted relative to the terminal hole axis. When the cable is tilted, the sealing effect is poor, posing a safety hazard. Summary of the Invention

[0004] The purpose of this application is to provide a cable joint sealing structure and a differential pressure switch, which aims to solve the technical problem that existing cables need to be led out at an angle during actual use, affecting the sealing performance of the cable joint.

[0005] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0006] In a first aspect, a cable connector sealing structure is provided for connection to a mounting housing, the mounting housing having a first mounting hole suitable for inserting a communication cable; the cable connector sealing structure includes:

[0007] A sealing seat is fixed to the mounting housing and extends axially along the first mounting hole; the sealing seat has a second mounting hole communicating with the first mounting hole;

[0008] A partition portion is disposed within the second mounting hole and extends radially along the sealing seat; the partition portion is annularly sleeved on the outside of the communication cable.

[0009] A first sealing assembly is circumferentially disposed within the second mounting hole and positioned above the partition portion; and

[0010] The second sealing assembly is circumferentially disposed within the second mounting hole and positioned below the partition portion;

[0011] The annular inner wall of the first sealing component and the annular inner wall of the second sealing component both abut against the outer peripheral wall of the communication cable; the diameter of the annular inner wall of the partition portion is smaller than the diameter of the communication cable, so that the annular inner wall of the partition portion is pressed against the outer peripheral wall of the communication cable.

[0012] Compared with the prior art, the solution shown in the embodiments of this application provides a first sealing component and a second sealing component distributed vertically at the cable connector end, which can extend the sealing length along the length of the communication cable to achieve double protection at the cable connector.

[0013] Furthermore, in this application, the first sealing component and the second sealing component are separated by a partition. The diameter of the annular inner wall of the partition is smaller than the diameter of the communication cable. Therefore, the annular inner wall of the partition can press against the communication cable. When the end of the communication cable extending out of the sealing seat is tilted in a direction deviating from the axis of the second mounting hole, even if the outer peripheral wall of the communication cable near the protruding end may separate from the upper part of the first sealing component, the partition can still abut against the outer peripheral wall of the communication cable due to the pressing effect of the partition. This ensures that the second sealing component abuts against the outer peripheral wall of the communication cable, thereby achieving sealing protection of the communication cable connector end.

[0014] Therefore, the two-stage sealing structure composed of the first sealing component and the second sealing component in this application can extend the sealing length of the connector end, and the pressing effect of the partition on the communication cable can enhance the adhesion between the second sealing component and the outer peripheral wall of the communication cable. When the upper end of the communication cable is tilted, the sealing effect of the communication cable near the lower end of the mounting housing can be improved, effectively improving the sealing performance and safety of the cable connector.

[0015] In conjunction with the first aspect, in one possible implementation, the first sealing assembly includes:

[0016] A first sealing ring abuts against the top surface of the partition portion and is fixed in the second mounting hole; the first sealing ring has a first hemispherical hole with an upward opening;

[0017] A sealing ball is disposed inside the first hemispherical hole and fits against the hole wall of the first hemispherical hole; the sealing ball is provided with a connecting hole that extends radially through it;

[0018] The communication cable passes through the first sealing ring and the connecting hole in sequence; the inner wall of the connecting hole is fixed to the outer peripheral wall of the communication cable, and the inner wall of the first sealing ring is in contact with the outer peripheral wall of the communication cable; during the tilting of the upper end of the communication cable at a preset angle, the communication cable drives the sealing ball to rotate at a preset angle, and the outer peripheral wall of the sealing ball is always in contact with the hole wall of the first hemispherical hole.

[0019] In this embodiment, a first sealing ring is provided. The first hemispherical hole of the first sealing ring can fit against the outer peripheral wall of the sealing ball. When the protruding end of the communication cable is tilted, since the communication cable is fixed to the sealing ball, the sealing ball will rotate at a small angle under the pressure of the tilted side of the upper end of the communication cable. However, due to the spherical shape of the sealing ball, even after rotating at an angle, the sealing ball can still fit against the hole wall of the first hemispherical hole. Therefore, the sealing effect between the first sealing ring and the sealing ball can be guaranteed, thereby ensuring the sealing effect between the communication cable and the first sealing ring.

[0020] In some embodiments, the first sealing assembly further includes:

[0021] The second sealing ring is placed inside the second mounting hole, and its top surface abuts against the top wall of the sealing seat; the bottom of the second sealing ring is provided with a second hemispherical hole with an opening facing downwards, and the hole wall of the second hemispherical hole is in contact with the outer peripheral wall of the sealing ball;

[0022] The communication cable is inserted inside the second sealing ring. During the process of the communication cable driving the sealing ball to rotate at a preset angle, the outer peripheral wall of the sealing ball is always in contact with the hole wall of the second hemispherical hole.

[0023] By further adding a second sealing ring, a seal can be achieved between the second sealing ring and the sealing ball, ensuring the sealing effect of the communication cable from the top of the sealing ball and further guaranteeing the safety of the communication cable.

[0024] For example, the top of the first sealing ring is further provided with an annular extension, which extends upward and presses against the outer peripheral wall of the second sealing ring and the wall of the second mounting hole.

[0025] By providing an annular extension, the second sealing ring is placed inside the annular extension of the first sealing ring, thereby increasing the tightness of the connection between the first and second sealing rings and ensuring the sealing effect between the first and second sealing rings.

[0026] In some embodiments, the partition portion is provided with a plurality of first stiffeners spaced circumferentially along the second mounting hole, and the first stiffeners are pressed upward into the first sealing ring;

[0027] The top wall of the sealing seat is provided with a plurality of second ribs spaced apart circumferentially along the second mounting hole, and the second ribs are pressed downward into the second sealing ring.

[0028] By setting the first stiffener, the support strength of the partition portion for the first sealing ring is improved, and at the same time, the first stiffener helps to press the first sealing ring tightly against the lower part of the sealing ball; similarly, the second stiffener is used to improve the support strength of the second sealing ring, and helps to press the second sealing ring tightly against the upper part of the sealing ball.

[0029] In conjunction with the first aspect, in one possible implementation, the top of the mounting housing is provided with a ring-shaped mounting platform;

[0030] The mounting platform has a third mounting hole; the third mounting hole is vertically connected to the first mounting hole, and a stepped surface is formed at the junction of the third mounting hole and the first mounting hole;

[0031] The outer peripheral wall of the mounting platform is screwed to the lower end of the second mounting hole, and the second sealing component is disposed in the third mounting hole and limited on the step surface.

[0032] By setting up a mounting platform, the mounting housing and the sealing seat can be fixed together. At the same time, the stepped surface at the bottom of the third mounting hole can limit the second sealing component in the third mounting hole, thereby achieving a seal between the second sealing component and the mounting housing.

[0033] In addition, the mounting housing, through the internal and external connection between the mounting platform and the sealing seat, can form a lower layer of protection outside the mounting platform and facilitate the accommodation of the upper first sealing component.

[0034] In some embodiments, the second sealing assembly includes:

[0035] A rubber sealing tube is disposed in the third mounting hole and sleeved on the outside of the communication cable; the communication cable passes through and abuts against the rubber sealing tube.

[0036] A clamping ring is clamped between the rubber sealing tube and the wall of the third mounting hole.

[0037] The rubber sealing tube is used to seal the communication cable outlet end with the mounting housing, ensuring the seal at the bottom of the communication cable. The clamping ring is used to press the rubber sealing tube onto the communication cable to increase the tightness of the connection between the communication cable and the rubber sealing tube.

[0038] For example, both the upper and lower ends of the rubber sealing tube are provided with tapered portions, and the cross-sectional dimensions of the tapered portions gradually decrease in the direction away from the center of the rubber sealing tube;

[0039] Two clamping rings are provided, and the two clamping rings are respectively provided on the two conical portions.

[0040] By setting two tapered sections at the top and bottom, and correspondingly setting two clamping rings, the two ends of the rubber sealing tube can be clamped from the top and bottom to ensure the sealing effect at both ends.

[0041] In conjunction with the first aspect, in one possible implementation, the sealing seat includes:

[0042] A base is fixed to the mounting housing; the base has a second mounting hole that extends vertically through it.

[0043] The cap is placed on top of the second mounting hole and pressed against the upper end of the first sealing assembly.

[0044] By setting a cap and a base, a second mounting hole can be easily formed between the cap and the base, and the upper end of the second mounting hole can be sealed by the cap to press the first sealing component into the second mounting hole.

[0045] Secondly, embodiments of this application also provide a differential pressure switch, which includes:

[0046] The mounting housing has a first mounting hole suitable for inserting a communication cable; the mounting housing is used to install a circuit unit and a valve core unit.

[0047] The aforementioned cable connector sealing structure is fixed to the mounting housing.

[0048] The differential pressure switch provided in this application, because it includes the above-mentioned cable joint sealing structure, has all the beneficial effects of the above-mentioned cable joint sealing structure. It can always ensure the sealing effect of the lower end when the upper end of the communication cable is tilted, effectively improving the sealing performance and safety of the cable joint. Attached Figure Description

[0049] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0050] Figure 1 This is a schematic diagram illustrating the separation of communication cables from the sealing structure in existing technologies.

[0051] Figure 2 A cross-sectional view of the cable connector sealing structure provided in this application embodiment. Figure 1 ;

[0052] Figure 3 Schematic cross-sectional view of the cable connector sealing structure provided in the embodiments of this application Figure 2 ;

[0053] Figure 4 A schematic diagram of the connection structure of the first sealing ring and the second sealing ring provided in the embodiments of this application;

[0054] Figure 5 This is a three-dimensional structural diagram of the sealing seat provided in the embodiments of this application;

[0055] Figure 6 This is a three-dimensional structural diagram of the first sealing ring provided in an embodiment of this application;

[0056] Figure 7 This is a three-dimensional structural diagram of the second sealing ring provided in an embodiment of this application;

[0057] Figure 8 This is a three-dimensional structural diagram of the cap provided in an embodiment of this application;

[0058] Figure 9 This is a schematic cross-sectional view of the communication cable when tilted, as provided in an embodiment of this application.

[0059] Figure 10 For the appendix Figure 9 Enlarged structural diagram at point A;

[0060] Figure 11 A cross-sectional structural schematic diagram of the differential pressure switch provided in an embodiment of this application;

[0061] Figure 12 This is a three-dimensional structural diagram of the differential pressure switch provided in an embodiment of this application.

[0062] In the diagram: 1. Sealing seat; 11. Base; 111. Second mounting hole; 12. Cover; 121. Second stiffener; 13. Partition; 131. First stiffener; 2. First sealing assembly; 21. First sealing ring; 211. Annular extension; 212. First hemispherical hole; 213. First slot; 22. Sealing ball; 23. Second sealing ring; 231. Second hemispherical hole; 232. Second slot; 3. Second sealing assembly; 31. Rubber sealing tube; 32. Compression ring; 4. Mounting housing; 41. First mounting hole; 42. Intermediate housing; 43. Base; 44. Cover; 5. Mounting platform; 51. Third mounting hole; 6. Circuit unit; 7. Valve core unit; 8. Communication cable; 9. Sealing structure; 10. Separation gap. Detailed Implementation

[0063] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0064] It should be noted that when an element is referred to as being "set on" another element, it can be directly on or indirectly on that other element. It should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing this application and simplifying the description, and are not intended to 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.

[0065] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] It should be noted that the orientation or positional relationship indicated by "inner", "outer", "upper", "lower" etc. in this embodiment is based on the orientation shown in the attached drawings. With the axis of the communication cable 8 as the center, the side of each ring structure closer to the axis of the communication cable 8 represents "inner", and the side farther away from the axis of the communication cable 8 represents "outer". In the orientation shown in the drawings, the direction in which the communication cable 8 extends out of the mounting housing 4 is "upper", and the end closer to the end of the communication cable 8 that extends into the mounting housing 4 is "lower".

[0067] It should be understood that the outer protective sheath of the end of the communication cable 8 that extends into the mounting housing 4 needs to be stripped and the internal core wires connected. In order to protect the airtightness of the internal core wires, the end of the communication cable 8 that extends out of the mounting housing 4 needs to be sealed to prevent external rainwater or moisture and dust from entering the mounting housing 4.

[0068] As attached Figure 1 As shown, however, in actual operation, when the protruding end of the communication cable 8 extends out of the mounting housing 4, it often needs to tilt in a direction that deviates from the axis of the first mounting hole 41 inside the mounting housing 4. This will cause one side of the outer peripheral wall of the communication cable 8 to be pressed against the sealing structure 9, while the other side is separated from the sealing structure 9, forming a separation gap 10, which is not conducive to its sealing performance and safety.

[0069] Please refer to the following: Figures 2 to 12The cable connector sealing structure and differential pressure switch provided in this application are described below. The cable connector sealing structure is used to connect to the mounting housing 4, which has a first mounting hole 41 suitable for inserting a communication cable 8. The cable connector sealing structure includes a sealing seat 1, a partition portion 13, a first sealing assembly 2, and a second sealing assembly 3. The sealing seat 1 is fixed to the mounting housing 4 and extends axially along the first mounting hole 41. The sealing seat 1 has a second mounting hole 111 communicating with the first mounting hole 41. The partition portion 13 is disposed in the second mounting hole 111 and extends radially along the sealing seat 1. Part 13 is annularly sleeved on the outside of the communication cable 8; the first sealing component 2 is annularly disposed within the second mounting hole 111 and positioned above the partition part 13; the second sealing component 3 is annularly disposed within the second mounting hole 111 and positioned below the partition part 13; wherein, the annular inner wall of the first sealing component 2 and the annular inner wall of the second sealing component 3 both abut against the outer peripheral wall of the communication cable 8; the diameter of the annular inner wall of the partition part 13 is smaller than the diameter of the communication cable 8, so that the annular inner wall of the partition part 13 is pressed tightly against the outer peripheral wall of the communication cable 8.

[0070] It should be understood that the first sealing component 2 and the second sealing component 3 in this application are distributed in the vertical direction. Therefore, compared with a set of sealing structures, the actual sealing length can be extended, thereby reducing the risk that both the first sealing component 2 and the second sealing component 3 will separate from the communication cable 8.

[0071] Furthermore, this application includes a partition 13, which can press against the communication cable 8 to increase the sealing performance between the sealing seat 1 and the communication cable 8. At the same time, it presses the first sealing component 2 and the second sealing component 3 located in the second mounting hole 111 of the sealing seat 1 against the communication cable 8 to reduce the separation gap between the communication cable 8 and the first sealing component 2 and the second sealing component 3.

[0072] It should be noted that both the first sealing component 2 and the second sealing component 3 are annular structures. When the first sealing component 2 and the second sealing component 3 are annularly arranged in the second mounting hole 111, the inner walls of the first sealing component 2 and the second sealing component 3 abut against the communication cable 8, and the axes of the first sealing component 2 and the second sealing component 3 coincide with the axis of the second mounting hole 111, which can ensure the consistency of the force on the first sealing component 2 and the second sealing component 3 in the circumferential direction.

[0073] It should be understood that the second mounting hole 111 and the first mounting hole 41 are connected vertically, and one end of the communication cable 8 passes through the first mounting hole 41 and the second mounting hole 111 in sequence, forming the protruding end of the communication cable 8, that is, the end of the communication cable 8 that protrudes from the sealing seat 1; wherein, when the communication cable 8 passes through the second mounting hole 111, its outer peripheral wall abuts against the annular inner wall of the first sealing component 2, the annular inner wall of the partition portion 13 and the annular inner wall of the second sealing component 3.

[0074] Furthermore, since the diameter of the annular inner wall of the partition portion 13 is smaller than the diameter of the communication cable 8, the annular inner wall of the partition portion 13 exerts a certain pressure on the outer peripheral wall of the communication cable 8 to form an interference fit connection. It should be noted that although the diameter of the annular inner wall of the partition portion 13 is smaller than the diameter of the communication cable 8, the actual difference is not significant, in order to avoid excessive compression of the communication cable 8 by the partition portion 13.

[0075] Theoretically, when the end of the communication cable 8 extending out of the sealing seat 1 is tilted in a direction deviating from the axis of the second mounting hole 111, a separation gap may be formed between the outer peripheral wall of the communication cable 8 and the upper end of the second sealing component 3, and the radial width of the separation gap gradually decreases from the end away from the mounting housing 4 to the end closer to the mounting housing 4; and the greater the tilt angle, the greater the extension length of the separation gap along the axial direction of the second mounting hole 111.

[0076] In this application, the pressing action of the partition 13 can be achieved by the pressing action between the annular inner wall of the partition 13 and the outer peripheral wall of the communication cable 8, thereby offsetting the pressing force of the partition 13 and the partial inclined tensile force of the communication cable 8, thus reducing the inclined length and width of the communication cable 8. In other words, the partition 13 can reduce the length of the separation gap to a certain extent, and stop the separation gap at the first sealing component 2 as much as possible, thereby improving the sealing effect of the communication cable 8 and preventing water from entering.

[0077] Preferably, the partition portion 13 and the sealing seat 1 are an integral structure; specifically, the partition portion 13 divides the second mounting hole 111 of the sealing seat 1 into an upper mounting hole, a middle pressing hole and a lower mounting hole. The first sealing component 2 is installed in the upper mounting hole, the second sealing component 3 is installed in the lower mounting hole, and the communication cable 8 is pressed in the middle pressing hole.

[0078] Furthermore, when the communication cable 8 is tilted, the end extending out of the second mounting hole 111 is often subjected to a large tilting force. If the communication cable 8 is directly pressed against the upper end of the second sealing component 3 by the partition, it is easy to cause the communication cable 8 to be crushed at the outlet of the partition. In this embodiment, the partition part 13 is placed between the first sealing component 2 and the second sealing component 3. The upper end of the first sealing component 2 can first provide buffering, and then the pressure of the first sealing component 2 can offset part of the tilting force. Then, the pressure of the partition part 13 can further offset the tilting force. Finally, the tilting force transmitted to the second sealing component 3 is very small. Therefore, the sealing effect at the second sealing component 3 can be improved.

[0079] Compared with the prior art, the cable connector sealing structure provided in this application has a first sealing component 2 and a second sealing component 3 distributed vertically at the end of the cable connector, which can extend the sealing length along the length of the communication cable 8 to achieve double protection at the top and bottom of the cable connector.

[0080] Furthermore, in this application, the first sealing component 2 and the second sealing component 3 are separated by the partition portion 13. Since the diameter of the annular inner wall of the partition portion 13 is smaller than the diameter of the communication cable 8, the annular inner wall of the partition portion 13 can press against the communication cable 8. When the end of the communication cable 8 extending out of the sealing seat 1 is tilted in a direction deviating from the axis of the second mounting hole 111, even if the outer peripheral wall of the communication cable 8 near the protruding end may separate from the upper part of the first sealing component 2, the partition portion 13 can still abut against the outer peripheral wall of the communication cable 8 due to the pressing effect of the partition portion 13. This ensures that the second sealing component 3 abuts against the outer peripheral wall of the communication cable 8, thereby achieving sealing protection of the connector end of the communication cable 8.

[0081] Therefore, the two-stage sealing structure composed of the first sealing component 2 and the second sealing component 3 in this application can extend the sealing length of the connector end, and the pressing effect of the partition portion 13 on the communication cable 8 can enhance the adhesion between the second sealing component 3 and the outer peripheral wall of the communication cable 8. When the upper end of the communication cable 8 is tilted, the sealing effect of the communication cable 8 near the lower end of the mounting housing 4 can be improved, effectively improving the sealing performance and safety of the cable connector.

[0082] Please see Figure 2 and Figure 4 In some possible embodiments, the first sealing assembly 2 includes a first sealing ring 21 and a sealing ball 22; the first sealing ring 21 abuts against the top surface of the partition portion 13 and is fixed in the second mounting hole 111; the first sealing ring 21 has a first hemispherical hole 212 with an upward opening; the sealing ball 22 is disposed in the first hemispherical hole 212 and fits against the hole wall of the first hemispherical hole 212; the sealing ball 22 has a connecting hole that extends radially through it; wherein, the communication cable 8 passes through the first sealing ring 21 and the connecting hole in sequence; the inner wall of the connecting hole is fixed to the outer peripheral wall of the communication cable 8, and the inner wall of the first sealing ring 21 fits against the outer peripheral wall of the communication cable 8; during the process of the upper end of the communication cable 8 tilting at a preset angle, the communication cable 8 drives the sealing ball 22 to rotate at a preset angle, and the outer peripheral wall of the sealing ball 22 always fits against the hole wall of the first hemispherical hole 212.

[0083] In this embodiment, a first sealing ring 21 is provided. The first hemispherical hole 212 of the first sealing ring 21 can fit with the outer peripheral wall of the sealing ball 22. When the protruding end of the communication cable 8 is tilted, since the communication cable 8 is fixed with the sealing ball 22, the sealing ball 22 will rotate a small angle under the pressure of the tilted side of the upper end of the communication cable 8. However, due to the spherical shape of the sealing ball 22, even after rotating a certain angle, the sealing ball 22 can still fit with the hole wall of the first hemispherical hole 212. Therefore, the sealing effect between the first sealing ring 21 and the sealing ball 22 can be guaranteed, thereby ensuring the sealing effect between the communication cable 8 and the first sealing ring 21.

[0084] It should be noted that the inner wall of the connection hole in the sealing ball 22 is fixedly connected to the outer peripheral wall of the communication cable 8 in this application. Therefore, when the communication cable 8 is tilted, the sealing ball 22 will also rotate accordingly.

[0085] Specifically, the fixing method between the sealing ball 22 and the communication cable 8 can be selectively set according to actual needs. The communication cable 8 and the sealing ball 22 can be fixed by interference fit or by adhesive.

[0086] In addition, the first sealing ring 21 abuts against the top of the partition portion 13, so that the bottom of the first sealing ring 21 fits against the top surface of the partition portion 13, and the sealing ball 22 presses the first sealing ring 21 downward, so that the first sealing ring 21 abuts against the top surface of the partition portion 13.

[0087] It should be noted that in this embodiment, the first sealing ring 21 is fixed in the second mounting hole 111, or the first sealing ring 21 is limited in the second mounting hole 111; it can be understood that the first sealing ring 21 is snapped or inserted into the partition portion 13; preferably, the first sealing ring 21 is limited in the second mounting hole 111 by the insertion method of the first rib 131 and the first slot 213.

[0088] The first sealing ring 21 is placed inside the second mounting hole 111, and the outer peripheral wall of the first sealing ring 21 abuts against the hole wall of the second mounting hole 111; optionally, the first sealing ring 21 and the second mounting hole 111 are connected by an interference fit.

[0089] The sealing ball 22 is placed inside the first hemispherical hole 212 and is not fixed to the hole wall of the first hemispherical hole 212. When the communication cable 8 is tilted, the communication cable 8 can drive the sealing ball 22 to rotate inside the first hemispherical hole 212. During the rotation, the outer peripheral wall of the sealing ball 22 is always in contact with the hole wall of the first hemispherical hole 212, which can ensure the sealing between the sealing ball 22 and the first sealing ring 21.

[0090] Optionally, a water guide can be provided at the lower part of the first sealing ring 21. The water guide extends from the hole wall of the first hemispherical hole 212 to the outer peripheral wall of the first sealing ring 21, and is discharged through the water outlet provided on the sealing seat 1. Specifically, the structure and position of the water guide and the water outlet can be selectively set according to actual needs.

[0091] For example, grease may be applied inside the first hemispherical hole 212 to reduce friction.

[0092] It should be understood that the sealing ball 22 has two forms: static sealing and dynamic sealing. Specifically, under static sealing: when the cable is vertical, the sealing ball 22 relies on its own weight to fit against the bottom of the first hemispherical hole 212 to form an inner ring seal, and the first sealing ring 21 achieves outer protection within the sealing seat 1.

[0093] Under dynamic deflection sealing: When the upper end of the communication cable 8 is tilted at a preset angle, since the cable is fixed to the sealing ball 22, the sealing ball 22 will rotate at a preset angle within the first hemispherical hole 212. However, the outer spherical surface of the sealing ball 22 always remains in contact with the inner spherical surface of the first hemispherical hole 212, forming a "spherical hinge" type dynamic sealing interface.

[0094] In this embodiment, the tilting motion of the cable is converted into the rotation of the sealing ball 22, which avoids the separation gap between the cable and the sealing hole, thereby maintaining the integrity of the seal.

[0095] Please see Figure 2 and Figure 7 In some embodiments, the first sealing assembly 2 further includes a second sealing ring 23; the second sealing ring 23 is placed inside the second mounting hole 111, and its top surface abuts against the top wall of the sealing seat 1; the bottom of the second sealing ring 23 is provided with a downward-opening second hemispherical hole 231, and the hole wall of the second hemispherical hole 231 is in contact with the outer peripheral wall of the sealing ball 22; wherein, the communication cable 8 passes through the second sealing ring 23, and during the process of the communication cable 8 driving the sealing ball 22 to rotate at a preset angle, the outer peripheral wall of the sealing ball 22 is always in contact with the hole wall of the second hemispherical hole 231.

[0096] By further setting the second sealing ring 23, the seal between the second sealing ring 23 and the sealing ball 22 can be achieved, ensuring the sealing effect of the communication cable 8 from the upper end of the sealing ball 22, and further ensuring the safety of the communication cable 8.

[0097] The second sealing ring 23 is located inside the second mounting hole 111, and its top surface presses against the top wall of the sealing seat 1 to form an upper and lower positional relationship with the first sealing ring 21. The second sealing ring 23 is provided with a downward-opening second hemispherical hole 231, which can be connected with the first hemispherical hole 212 to form a whole ball hole, thereby sealing the sealing ball 22 inside the whole ball hole.

[0098] At this time, when the communication cable 8 tilts and drives the sealing ball 22 to rotate, the sealing ball 22 can rotate inside the ball hole, and during the rotation of the preset angle, the outer peripheral wall of the sealing ball 22 is always in contact with the hole wall of the ball hole; even under the tilting force of the communication cable 8, it can be ensured that the hole wall of the ball hole is still in contact with the outer peripheral wall of the sealing ball 22 for at least one circumference. Moreover, even if there is a separation gap, the actual separation gap can be greatly reduced compared with the prior art. On this basis, combined with the pressing effect of the partition 13, the sealing of the second sealing component 3 can be ensured without interference. Therefore, the sealing of the joint part of the communication cable 8 extending into the mounting housing 4 can be guaranteed.

[0099] It should be understood that, in addition to the second hemispherical hole 231, the second sealing ring 23 also has a through hole communicating with the second hemispherical hole 231. After the communication cable 8 exits through the second hemispherical hole 231, it must pass through the through hole and the top wall of the sealing seat 1 before exiting the sealing seat 1. When the communication cable 8 is tilted away from the axis of the second mounting hole 111, a separation gap may form between the communication cable 8 and the wall of the through hole, as shown in the attached diagram. Figure 10 As shown, however, a seal can still be maintained at the second hemispherical hole 231.

[0100] Therefore, in this embodiment, the second sealing ring 23 and the first sealing ring 21 provide symmetrical constraint on the upper and lower parts of the sealing ball 22. The upper and lower hemispherical holes can limit the maximum tilt angle of the communication cable 8 by restricting the sealing ball 22, thereby avoiding excessive deformation of the communication cable 8.

[0101] Please see Figure 6 For example, the top of the first sealing ring 21 is also provided with an annular extension 211, which extends upward and abuts against the outer peripheral wall of the second sealing ring 23 and the hole wall of the second mounting hole 111.

[0102] By providing an annular extension 211, the second sealing ring 23 is placed inside the annular extension 211 of the first sealing ring 21, thereby increasing the tightness of the connection between the first sealing ring 21 and the second sealing ring 23 and ensuring the sealing effect between the first sealing ring 21 and the second sealing ring 23.

[0103] The first sealing ring 21 and the second sealing ring 23 are two independent parts arranged side by side. In this embodiment, they are connected into a nested integral sealing unit through the annular extension 211, which can further ensure the sealing effect of the first sealing component 2.

[0104] Optionally, the annular extension 211 is integrally formed with the first sealing ring 21 to ensure elasticity and sealing.

[0105] The annular extension 211 forms an additional radial seal around the second sealing ring 23, blocking any leakage path caused by assembly gaps or machining errors that may exist between the outer wall of the second sealing ring 23 and the inner wall of the mounting hole.

[0106] Please see Figure 5 and Figure 8 In some embodiments, the partition portion 13 is provided with a plurality of first ribs 131 spaced apart circumferentially along the second mounting holes 111, and the first ribs 131 are pressed upward into the first sealing ring 21; the top wall of the sealing seat 1 is provided with a plurality of second ribs 121 spaced apart circumferentially along the second mounting holes 111, and the second ribs 121 are pressed downward into the second sealing ring 23.

[0107] By setting the first stiffener 131, the support strength of the partition portion 13 for the first sealing ring 21 is improved, and at the same time, it is beneficial for the first stiffener 131 to press the first sealing ring 21 tightly against the lower part of the sealing ball 22; similarly, the second stiffener 121 is used to improve the support strength of the second sealing ring 23, and it is beneficial for the second stiffener 121 to press the second sealing ring 23 tightly against the upper part of the sealing ball 22.

[0108] For example, the first stiffener 131 is integrally formed with the partition portion 13; optionally, the first stiffener 131 is fixed on the partition portion 13, specifically by means of bolt connection, welding or other methods.

[0109] The first stiffener 131 and the second stiffener 121 are pressed into the corresponding first sealing ring 21 or second sealing ring 23 at circumferential intervals, forming multiple localized reinforced sealing bands. When the communication cable 8 is installed at an angle, the first sealing ring 21 or second sealing ring 23 will be subjected to a certain compression. The first stiffener 131 and the second stiffener 121 are embedded therein, which can prevent excessive deformation of the first sealing ring 21 and the second sealing ring 23, effectively prevent the expansion of the separation gap, and ensure good sealing performance.

[0110] In addition, the first stiffener 131 and the second stiffener 121 increase the pressure-bearing skeleton of the first sealing ring 21 and the second sealing ring 23, which can help the first sealing ring 21 and the second sealing ring 23 maintain their shape when subjected to internal and external pressure differences, which is beneficial to improving the long-term durability of the entire first sealing assembly 2 under harsh working conditions.

[0111] Specifically, the first sealing ring 21 is provided with a plurality of first slots 213, and a first rib plate 131 is inserted into each first slot 213; similarly, the second sealing ring 23 is provided with a plurality of second slots 232, and a second rib plate 121 is inserted into each second slot 232.

[0112] It needs to be understood that, attached Figure 2The first stiffener 131 and the second stiffener 121 are cut apart at the mid-section, attached Figure 3 A cross-sectional structural diagram showing the staggered arrangement of the first stiffener 131 and the second stiffener 121.

[0113] Please see Figure 2 or Figure 3 In some possible embodiments, the top of the mounting housing 4 is provided with an annular mounting platform 5; the mounting platform 5 has a third mounting hole 51; the third mounting hole 51 is vertically connected to the first mounting hole 41, and a stepped surface is formed at the junction of the third mounting hole 51 and the first mounting hole 41; wherein, the outer peripheral wall of the mounting platform 5 is screwed to the lower end of the second mounting hole 111, and the second sealing component 3 is disposed in the third mounting hole 51 and is limited on the stepped surface.

[0114] By setting the mounting platform 5, the mounting housing 4 and the sealing seat 1 can be fixed. At the same time, the stepped surface at the bottom of the third mounting hole 51 can limit the second sealing component 3 in the third mounting hole 51, thereby achieving a seal between the second sealing component 3 and the mounting housing 4.

[0115] In addition, the mounting housing 4, through the internal and external connection between the mounting platform 5 and the sealing seat 1, can form a lower layer of protection outside the mounting platform 5 and facilitate the accommodation of the upper first sealing component 2.

[0116] Mounting platform 5 is an annular protrusion on the top of mounting housing 4. Its third mounting hole 51 and the first mounting hole 41 are aligned vertically and connected within the mounting housing 4, forming a "stepped hole". The stepped surface is formed in an annular shape at the point where the diameters of the third mounting hole 51 and the first mounting hole 41 change.

[0117] Specifically, the first mounting hole 41 is located at the bottom and has a smaller diameter, used to accommodate and fix the communication cable 8, while the third mounting hole 51 is located at the top and has a larger diameter, used to accommodate the second sealing assembly 3.

[0118] Optionally, the mounting platform 5 and the mounting housing 4 are integrally formed to ensure the sealing of the mounting housing 4.

[0119] For example, the outer peripheral wall of the mounting platform 5 is provided with external threads, and the second mounting hole 111 of the sealing seat 1 is provided with internal threads, and the internal threads are located below the partition portion 13, so that the second mounting hole 111 is screwed onto the outer peripheral wall of the mounting platform 5.

[0120] The second sealing assembly 3 is placed inside the third mounting hole 51, with its bottom resting on the stepped surface; the stepped surface ensures the axial limitation of the second sealing assembly 3. When the mounting plate 5 is tightened, the second sealing assembly 3 is firmly pressed against the stepped surface, achieving a reliable end face seal.

[0121] Therefore, in this embodiment, a four-level sleeve structure consisting of a communication cable 8, a second sealing component 3, a mounting platform 5, and a sealing seat 1 arranged sequentially from the inside out is formed below the partition portion 13.

[0122] Please see Figure 2 or Figure 3 In some embodiments, the second sealing assembly 3 includes a rubber sealing tube 31 and a clamping ring 32; the rubber sealing tube 31 is disposed in the third mounting hole 51 and sleeved on the outside of the communication cable 8; the communication cable 8 is inserted through and abuts against the rubber sealing tube 31; the clamping ring 32 is clamped between the rubber sealing tube 31 and the hole wall of the third mounting hole 51.

[0123] The rubber sealing tube 31 is used to seal the outlet end of the communication cable 8 with the mounting housing 4, ensuring the seal at the lower end of the communication cable 8. The clamping ring 32 is used to press the rubber sealing tube 31 onto the communication cable 8 to increase the tightness of the connection between the communication cable 8 and the rubber sealing tube 31.

[0124] The clamping ring 32 is pressed between the third mounting hole 51 and the rubber sealing tube 31, forcing the flexible rubber sealing tube 31 to press against the outer peripheral wall of the communication cable 8. The sealing force here comes directly from mechanical compression, and the static sealing effect is stable and independent of the pressure direction.

[0125] Furthermore, the combination of the rubber tube and the clamping ring 32 enables non-destructive installation of the seal and excellent adaptability. As an independent rigid component, the clamping ring 32 bears all the compressive stress during installation, protecting the rubber sealing tube 31 from shear damage during screwing in, while also ensuring the overall structural strength. In addition, the rubber sealing tube 31 can perfectly adapt to the tolerance fluctuations and irregularities of the outer diameter of the communication cable 8, meeting multiple requirements for high sealing performance and tolerance for cable dimensions.

[0126] Please see Figure 2 or Figure 3 For example, both the upper and lower ends of the rubber sealing tube 31 are provided with tapered portions, and the cross-sectional dimensions of the tapered portions gradually decrease in the direction away from the center of the rubber sealing tube 31; two clamping rings 32 are provided, and the two clamping rings 32 are respectively provided on the two tapered portions.

[0127] By setting two tapered parts at the top and bottom, and correspondingly setting two clamping rings 32, the two ends of the rubber sealing tube 31 can be clamped from the top and bottom to ensure the sealing effect at both ends.

[0128] It should be understood that the two conical parts are located at the upper and lower ends of the rubber sealing tube 31, and their cross-sectional dimensions gradually decrease outward to form an outer conical surface.

[0129] Each of the two independent rigid clamping rings 32 corresponds to a conical portion. The inner hole of the clamping ring 32 is also a matching inner conical surface; preferably, the inner wall of the clamping ring 32 is adapted to the shape of the outer wall of the conical portion, and there is an interference fit between the clamping ring 32 and the conical portion.

[0130] The double conical surface applies pressure from both ends simultaneously, ensuring that the rubber sealing tube 31 receives uniform compression force along its entire length, eliminating any weak sealing pressure areas that may exist in the middle, and helping to ensure the consistency of the seal at both ends of the rubber sealing tube 31.

[0131] Please see Figure 2 or Figure 3 In some possible embodiments, the sealing seat 1 includes a base 11 and a cover 12; the base 11 is fixed on the mounting housing 4; the base 11 has a second mounting hole 111 that runs vertically through it; the cover 12 covers the top of the second mounting hole 111 and presses against the upper end of the first sealing assembly 2.

[0132] By setting the cover 12 and the base 11, a second mounting hole 111 can be easily formed between the cover 12 and the base 11, and the upper end of the second mounting hole 111 can be sealed by the cover 12 to press the first sealing component 2 into the second mounting hole 111.

[0133] Specifically, the partition portion 13 is fixed in the second mounting hole 111 of the base 11, and the first rib 131 is fixed on the top surface of the partition portion 13; the second rib 121 is fixed on the side of the cover 12 facing the second mounting hole 111 and extends into the second sealing ring 23.

[0134] For example, the cover 12 is fixed to the top of the base 11; alternatively, the cover 12 and the base 11 are fixed by means of threaded connection or welding.

[0135] It is important to understand that the base 11 and the cover 12 together form a closed, rigid chamber. This chamber completely protects the first sealing component 2 and the second sealing component 3, physically isolating them from harsh external environments such as dust, water, and mechanical impact, greatly improving the operational stability and lifespan of the sealing system.

[0136] Please see Figure 11 and Figure 12 Based on the same inventive concept, this application also provides a differential pressure switch, which includes a mounting housing 4 and the aforementioned cable connector sealing structure; the mounting housing 4 has a first mounting hole 41 suitable for inserting a communication cable 8; the mounting housing 4 is used to install a circuit unit 6 and a valve core unit 7; the aforementioned cable connector sealing structure is fixed on the mounting housing 4.

[0137] It should be noted that circuit unit 6 is responsible for detecting and processing differential pressure signals and outputting switching commands; valve core unit 7 is controlled by circuit unit 6 or the differential pressure itself and performs the switching action of the fluid passage. Circuit unit 6 and valve core unit 7 are the core of the differential pressure switch to realize its measurement and control functions.

[0138] Specifically, the mounting housing 4 includes a base 43, an intermediate housing 42, and a cover 44 arranged sequentially from bottom to top, and the intermediate housing 42 is fixedly connected to the base 43 and the cover 44; preferably, the intermediate housing 42 is welded to the base 43 and the cover 44 is welded to the intermediate housing 42; the cover 44 is provided with the aforementioned first mounting hole 41, and the communication cable 8 passes through the mounting housing 4 from the side of the cover 44, therefore, the cable connector sealing structure is provided on the cover 44 of the mounting housing 4; specifically, the mounting platform 5 and the cover 44 are integrally formed.

[0139] The base 43 is provided with a valve core unit 7, which specifically includes a differential pressure valve core, a valve core seal, and a plug. Preferably, the base 43 includes a first part and a second part. The first part is provided with an inlet and a plug at the inlet. The second part is welded and fixed to the intermediate shell 42. Optionally, the plug and the first part of the base 43 are integrally laser-welded structures, which can change the pressure and flow rate through small holes to achieve buffering of pressure shocks.

[0140] The intermediate housing 42 is equipped with a circuit unit 6, and the end of the communication cable 8 that extends into the mounting housing 4 is equipped with a shielding component; optionally, the base of the communication cable 8 adopts the shielding layer outward turning method and is pressed by the shielding layer pressure plate to realize the interconnection between the shielding layer and the intermediate housing 42, thereby improving the sensor's anti-interference capability.

[0141] It should be understood that the specific structure and working principle of the valve core unit 7 and the circuit unit 6 set in this application are existing technologies and will not be described in detail here.

[0142] It should be noted that the mounting housing 4 serves as the mechanical body and protective shell of the differential pressure switch, and the first mounting hole 41 on its cover 44 is the channel for the external communication cable 8 to enter the housing.

[0143] The differential pressure switch provided in this application, having the aforementioned cable connector sealing structure, possesses all the beneficial effects of the aforementioned cable connector sealing structure. It can ensure the sealing effect of the lower end of the communication cable 8 even when the upper end is tilted, effectively improving the sealing performance and safety of the cable connector.

[0144] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cable connector sealing structure for connection to a mounting housing (4), the mounting housing (4) having a first mounting hole (41) suitable for inserting a communication cable (8); characterized in that, The cable connector sealing structure includes: A sealing seat (1) is fixed on the mounting housing (4) and extends axially along the first mounting hole (41); the sealing seat (1) has a second mounting hole (111) communicating with the first mounting hole (41); The partition portion (13) is disposed in the second mounting hole (111) and extends radially along the sealing seat (1); the partition portion (13) is annularly sleeved on the outside of the communication cable (8); A first sealing assembly (2) is circumferentially disposed within the second mounting hole (111) and positioned above the partition portion (13); the first sealing assembly (2) includes a first sealing ring (21) and a sealing ball (22); the first sealing ring (21) abuts against the top surface of the partition portion (13) and is fixed within the second mounting hole (111); the first sealing ring (21) has an upward-opening first hemispherical hole (212); the sealing ball (22) is disposed within the first hemispherical hole (212) and fits against the hole wall of the first hemispherical hole (212); the sealing ball (22) has a connecting hole extending radially through it; and The second sealing assembly (3) is circumferentially disposed within the second mounting hole (111) and positioned below the partition portion (13); In this process, the annular inner wall of the first sealing component (2) and the annular inner wall of the second sealing component (3) are both in contact with the outer peripheral wall of the communication cable (8); the diameter of the annular inner wall of the partition portion (13) is smaller than the diameter of the communication cable (8), so that the annular inner wall of the partition portion (13) is pressed against the outer peripheral wall of the communication cable (8); the communication cable (8) passes through the first sealing ring (21) and the connecting hole in sequence; the inner wall of the connecting hole is fixed to the outer peripheral wall of the communication cable (8), and the inner wall of the first sealing ring (21) is in contact with the outer peripheral wall of the communication cable (8); during the process of the upper end of the communication cable (8) tilting at a preset angle, the communication cable (8) drives the sealing ball (22) to rotate at a preset angle, and the outer peripheral wall of the sealing ball (22) is always in contact with the hole wall of the first hemispherical hole (212).

2. The cable connector sealing structure as described in claim 1, characterized in that, The first sealing assembly (2) further includes: The second sealing ring (23) is placed in the second mounting hole (111) and its top surface abuts against the top wall of the sealing seat (1); the bottom of the second sealing ring (23) is provided with a second hemispherical hole (231) opening downwards, and the hole wall of the second hemispherical hole (231) is in contact with the outer peripheral wall of the sealing ball (22); The communication cable (8) is inserted inside the second sealing ring (23). During the process of the communication cable (8) driving the sealing ball (22) to rotate at a preset angle, the outer peripheral wall of the sealing ball (22) is always in contact with the hole wall of the second hemispherical hole (231).

3. The cable connector sealing structure as described in claim 2, characterized in that, The top of the first sealing ring (21) is also provided with an annular extension (211), which extends upward and presses against the outer peripheral wall of the second sealing ring (23) and the hole wall of the second mounting hole (111).

4. The cable connector sealing structure as described in claim 3, characterized in that, The partition plate (13) is provided with a plurality of first stiffeners (131) spaced circumferentially along the second mounting hole (111), and the first stiffeners (131) are pressed upward into the first sealing ring (21); The top wall of the sealing seat (1) is provided with a plurality of second stiffening plates (121) spaced circumferentially along the second mounting hole (111), and the second stiffening plates (121) are pressed downward into the second sealing ring (23).

5. The cable connector sealing structure as described in claim 1, characterized in that, The mounting housing (4) is provided with a ring-shaped mounting platform (5) at its top; The mounting platform (5) has a third mounting hole (51); the third mounting hole (51) is vertically connected to the first mounting hole (41), and a stepped surface is formed at the junction of the third mounting hole (51) and the first mounting hole (41); The outer peripheral wall of the mounting platform (5) is screwed to the lower end of the second mounting hole (111), and the second sealing component (3) is disposed in the third mounting hole (51) and is limited on the step surface.

6. The cable connector sealing structure as described in claim 5, characterized in that, The second sealing assembly (3) includes: A rubber sealing tube (31) is disposed inside the third mounting hole (51) and sleeved outside the communication cable (8); the communication cable (8) is inserted through and abuts against the rubber sealing tube (31); A clamping ring (32) is clamped between the rubber sealing tube (31) and the wall of the third mounting hole (51).

7. The cable connector sealing structure as described in claim 6, characterized in that, Both ends of the rubber sealing tube (31) are provided with tapered portions, and the cross-sectional dimensions of the tapered portions gradually decrease in the direction away from the center of the rubber sealing tube (31). Two clamping rings (32) are provided, and the two clamping rings (32) are respectively provided on the two tapered portions.

8. The cable connector sealing structure as described in claim 1, characterized in that, The sealing seat (1) includes: The base (11) is fixed on the mounting housing (4); the base (11) is provided with a second mounting hole (111) that runs vertically through the base; The cap (12) is placed on top of the second mounting hole (111) and pressed against the upper end of the first sealing assembly (2).

9. A differential pressure switch, characterized in that, include: The mounting housing (4) has a first mounting hole (41) suitable for inserting a communication cable (8); the mounting housing (4) is used to mount a circuit unit (6) and a valve core unit (7); The cable connector sealing structure as described in any one of claims 1-8 is fixed to the mounting housing (4).

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