Micro differential pressure switch with magnetomotive spiral worm mechanism

Abstract

The utility model relates to the field of switches, and discloses a micro differential pressure switch with a magnetomotive spiral worm mechanism, which comprises a main body component and a control component, the main body component comprises a switch shell, an empty groove is formed in the switch shell, two interface pipes used for being connected with a hose are symmetrically communicated with the outer side of the switch shell, one of the two interface pipes is a positive pressure port, and the other is a negative pressure port; a bearing is connected to the middle of the bottom end of the interior of the empty groove; the control component comprises a longitudinal rotating shaft rotationally connected through a bearing, a transverse pointer is installed at the top end of the rotating shaft, and the peripheral side of the rotating shaft is fixedly sleeved with a worm wheel. The rod body of the worm can be driven to rotate under the action of the rotating mechanism, so that the worm gear and the rotating shaft are driven to drive the pointer to rotate, a spring connecting rod mechanism can be replaced by the action of the worm gear, the worm and the rotating mechanism for switching, and compared with the situation that the elastic force of a spring is weakened, the service life is undoubtedly longer through the switching mode.

Description

Technical Field

[0001] The utility model belongs to the field of switches, in particular to a micro-pressure difference switch with a magnetically driven spiral worm mechanism. Background Art

[0002] A differential pressure switch is a measuring and control instrument that senses and responds to minute changes in differential pressure. This switch is often used to monitor the pressure conditions of air and other gases, ensuring that the pressure in systems such as ventilation, air conditioning, clean rooms or industrial process control is maintained within a preset safe range.

[0003] The micro differential pressure switch usually contains a sensitive element such as a diaphragm or Bells, which can sense the pressure difference. When the pressure between the two pressure interfaces connected to the switch is different, the diaphragm will deform due to the pressure difference. The user can set a specific pressure difference threshold as needed. When the actual measured pressure difference reaches or exceeds this threshold, the switch action will be triggered.

[0004] The switch action is realized by a connecting rod structure, which is inside the instrument and usually controlled by the deformation of a spring. However, as the elastic force of the spring gradually decreases over time, the switch action will become less and less sensitive. Utility Model Content

[0005] Technical problem to be solved: How to replace the spring-link structure with a stable switch structure.

[0006] Technical solution: The utility model provides a micro-differential pressure switch with a magnetic spiral worm mechanism, including a main component and a control component: the main component includes a switch housing, an empty groove is opened inside the switch housing, and two interface pipes for connecting hoses are symmetrically connected on the outside thereof, one of the two interface pipes is a positive pressure port, and the other is a negative pressure port, and a bearing is connected to the middle of the inner bottom end of the empty groove; the control component includes a longitudinal rotating shaft rotatably connected by a bearing, a transverse pointer is installed on the top of the rotating shaft, and a worm gear is fixedly sleeved on the outer peripheral side thereof; in addition, bearing seats are symmetrically connected to the groove wall of the empty groove, and a worm meshing with the worm gear is matched and connected between the two bearing seats; at the same time, a rotating mechanism for driving the rod body of the worm gear to rotate is also provided in the empty groove.

[0007] Furthermore, the rotating mechanism includes a motor installed at the bottom of the empty slot, and the output shaft of the motor and the outer peripheral side of the rod body of the worm are both fixedly sleeved with mutually meshing bevel gears.

[0008] Furthermore, the bearing seat is composed of an outer shell and a bearing located in the outer shell, the outer wall of the outer shell is fixedly connected to the groove wall of the empty groove, and its inner wall is fixedly connected to the outer ring of the bearing, and the inner ring of the bearing is interference fit with the rod body of the worm.

[0009] Furthermore, the interface tube is penetrated by a plurality of partition grooves distributed in a circular array near its port, and these partition grooves divide this part of the interface tube into a plurality of arc-shaped pieces distributed in a circular array and not in contact with each other; in addition, a sleeve with a diameter larger than the sleeve is fixedly sleeved on the outer peripheral side of the interface tube, and the inner side of the sleeve is in contact with the outer wall of the switch housing, and the outer side thereof is flush with the inner side of the arc-shaped piece; not only that, the interface tube is also provided with a clamping mechanism for clamping the hose after connecting it.

[0010] Furthermore, the clamping mechanism includes an external thread opened on the outside of the arc-shaped pieces, and the outer peripheral sides of these arc-shaped pieces are sleeved with a nut whose internal thread is matched with the external thread.

[0011] Furthermore, the outer diameter of the nut is equal to the outer diameter of the sleeve, and the outer side of the nut is symmetrically connected to the two protrusions.

[0012] Technical effects:

[0013] 1. In the utility model, the rod body of the worm can be driven to rotate under the action of the rotating mechanism, thereby driving the worm wheel and the rotating shaft to drive the pointer to rotate. In this way, the spring-link mechanism can be replaced by the action of the worm wheel and the rotating mechanism to perform the switching action. Compared with the weakening of the spring elastic force, this switching method undoubtedly has a longer service life.

[0014] 2. In the utility model, after the nut is locked with a plurality of arc-shaped pieces, the arc-shaped pieces are pressed inwardly, so that the hose is squeezed and fixed to a certain extent, so that the hose can be connected more tightly without the problem of gas leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0016] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0017] Figure 2 It is a schematic diagram of the internal structure of the utility model;

[0018] Figure 3 This is a schematic diagram of the structure of the clamping mechanism of the utility model;

[0019] In the figure: 1. switch housing; 2. empty slot; 3. interface pipe; 301. spacer slot; 302. sleeve; 4. rotating shaft; 5. pointer; 6. worm gear; 7. bearing seat; 8. worm; 9. rotating mechanism; 901. motor; 902. bevel gear; 10. clamping mechanism; 1001. external thread; 1002. nut. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0021] The micro differential pressure switch with a magnetically driven spiral worm mechanism provided in this specific embodiment is as follows: Figure 1 and Figure 2 As shown, it includes a main component and a control component, wherein:

[0022] The main component includes a switch housing 1, an empty slot 2 is provided inside the switch housing 1, and two interface pipes 3 for connecting hoses are symmetrically connected to the outer side thereof, one of the two interface pipes 3 is a positive pressure port and the other is a negative pressure port, and a bearing is connected to the middle of the inner bottom end of the empty slot 2. Figure 3 As shown, the interface tube 3 is provided with a plurality of spaced grooves 301 distributed in an annular array near its port, and these spaced grooves 301 divide this part of the interface tube 3 into a plurality of arc-shaped pieces distributed in an annular array and not in contact with each other; in addition, the outer peripheral side of the interface tube 3 is fixedly sleeved with a sleeve 302 having a diameter larger than the sleeve, the inner side of the sleeve 302 is in contact with the outer wall of the switch housing 1, and the outer side thereof is flush with the inner side of the arc-shaped piece; in addition, the interface tube 3 is also provided with a clamping mechanism 10 for clamping the hose after connecting the hose, and the clamping mechanism 10 includes an external thread 1001 provided on the outer side of the arc-shaped piece, and the outer peripheral side of these arc-shaped pieces is sleeved with a nut 1002 whose internal thread is matched with the external thread 1001. After the nut 1002 is locked with the plurality of arc-shaped pieces, the arc-shaped pieces are pressed inwardly, so that the hose is squeezed and fixed to a certain extent, so that the hose can be connected more tightly without the problem of gas leakage.

[0023] The control component includes a longitudinal rotating shaft 4 which is rotatably connected through a bearing. Specifically, the bearing seat 7 is composed of an outer shell and a bearing located in the outer shell. The outer wall of the outer shell is fixedly connected to the groove wall of the empty slot 2, and its inner wall is fixedly connected to the outer ring of the bearing. The inner ring of the bearing is interference fit with the rod body of the worm 8. A horizontal pointer 5 is installed on the top of the rotating shaft 4, and a worm wheel 6 is fixedly sleeved on the outer peripheral side of the pointer 5. In addition, the groove wall of the empty slot 2 is symmetrically connected with the bearing seats 7, and the worm 8 meshing with the worm wheel 6 is matched and connected between the two bearing seats 7. At the same time, a rotating mechanism 9 for driving the rod body of the worm 8 to rotate is also provided in the empty slot 2. The rotating mechanism 9 includes a motor 901 installed at the bottom of the empty slot 2, and the output shaft of the motor 901 and the outer peripheral side of the rod body of the worm 8 are fixedly sleeved with mutually meshing bevel gears 902.

[0024] It is worth mentioning that, on the one hand, in order to make the structure beautiful, the outer diameter of the nut 1002 is equal to the outer diameter of the sleeve 302; on the other hand, in order to facilitate manual rotation of the nut 1002, two protrusions are symmetrically connected on the outer side of the nut 1002 to form a hand-leveraging structure.

[0025] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0026] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A micro differential pressure switch with a magnetically driven spiral worm mechanism, comprising a main component and a control component: The main component comprises a switch housing (1), the interior of which is provided with an empty slot (2), and the outer side of which is symmetrically connected with two interface pipes (3) for connecting a hose, wherein one of the two interface pipes (3) is a positive pressure port and the other is a negative pressure port, and the switch housing (1) is characterized in that: A bearing is connected in the middle of the inner bottom end of the hollow groove (2); The control member comprises a longitudinal rotating shaft (4) rotatably connected via a bearing, a transverse pointer (5) being mounted on the top end of the rotating shaft (4), and a worm gear (6) being fixedly sleeved on the outer peripheral side thereof; in addition, bearing seats (7) are symmetrically connected to the groove wall of the empty groove (2), and a worm (8) meshing with the worm gear (6) is matched and connected between the two bearing seats (7); at the same time, a rotating mechanism (9) for driving the rod body of the worm gear (8) to rotate is also arranged in the empty groove (2).

2. The micro differential pressure switch with a magnetically driven spiral worm mechanism according to claim 1, characterized in that: The rotating mechanism (9) comprises a motor (901) installed at the bottom of the empty slot (2), and the output shaft of the motor (901) and the outer peripheral side of the rod body of the worm (8) are both fixedly sleeved with mutually meshing bevel gears (902).

3. The micro differential pressure switch with a magnetically driven spiral worm mechanism according to claim 1, characterized in that: The bearing seat (7) is composed of an outer shell and a bearing located in the outer shell. The outer wall of the outer shell is fixedly connected to the groove wall of the hollow groove (2), and the inner wall thereof is fixedly connected to the outer ring of the bearing. The inner ring of the bearing is interference fit with the rod body of the worm (8).

4. The micro differential pressure switch with a magnetically driven spiral worm mechanism according to claim 1, characterized in that: The interface tube (3) is provided with a plurality of hollow grooves (301) distributed in a circular array near its port, and these hollow grooves (301) divide this part of the interface tube (3) into a plurality of arc-shaped pieces distributed in a circular array and not in contact with each other; in addition, a sleeve (302) having a larger diameter than the sleeve is fixedly sleeved on the outer peripheral side of the interface tube (3), the inner side of the sleeve (302) is in contact with the outer wall of the switch housing (1), and the outer side thereof is flush with the inner side of the arc-shaped piece; in addition, the interface tube (3) is also provided with a clamping mechanism (10) for clamping the hose after connecting it.

5. The micro differential pressure switch with a magnetically driven spiral worm mechanism according to claim 4, characterized in that: The clamping mechanism (10) comprises an external thread (1001) formed on the outer side of the arc-shaped sheets, and a nut (1002) having an internal thread matched with the external thread (1001) is sleeved on the outer peripheral side of the arc-shaped sheets.

6. The micro differential pressure switch with a magnetically driven spiral worm mechanism according to claim 5, characterized in that: The outer diameter of the nut (1002) is equal to the outer diameter of the sleeve (302), and the outer side of the nut (1002) is symmetrically connected to the two protrusions.

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