CN212779714U

CN212779714U - High-precision differential pressure annunciator

Info

Publication number: CN212779714U
Application number: CN202022220223.2U
Authority: CN
Inventors: 马文涛; 丁星程; 罗燕
Original assignee: Sichuan Xinchuan Aviation Instrument Co ltd
Current assignee: Sichuan Xinchuan Aviation Instrument Co ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-03-23
Anticipated expiration: 2030-09-30

Abstract

The utility model discloses a high accuracy differential pressure signal ware, including well casing, with the procapsid that well casing links to each other, set up the low-pressure chamber with oil pump import intercommunication in the procapsid, set up the high-pressure chamber with oil pump export intercommunication in the well casing, the high-pressure chamber with separate mutually through the flexure strip between the low-pressure chamber, the flexure strip be provided with along axially extended ejector pin on the surface, be provided with micro-gap switch in the inner chamber of well casing, just the end of ejector pin is used for triggering during elastic deformation because of pressure differential in the both sides of flexure strip micro-gap switch. The utility model discloses an easy elastic sheet of deformation experiences the pressure differential of oil pump business turn over hydraulic fluid port to elastic deformation drive ejector pin through the elastic sheet triggers micro-gap switch, can avoid fluid impurity to influence, prevents and pressure differential impression sensitivity reduces, improves pressure differential detection precision simultaneously.

Description

High-precision differential pressure annunciator

Technical Field

The utility model relates to a pressure differential signaling ware technical field, in particular to high accuracy pressure differential signaling ware.

Background

Various sensors are used in vehicle engines or aircraft engines, and various hydraulic detection elements are commonly used for hydraulic systems. Because hydraulic oil circulates in a hydraulic system for a long time, impurities in the hydraulic oil need to be filtered in time, and at present, a filter is generally arranged in an oil pump to clean the hydraulic oil, such as a fuel filter and the like.

After the fuel filter is used for a period of time, the filtered impurities are gradually accumulated and attached to the surface of the filter element, so that the resistance of the filter element is increased, if the filter element cannot be replaced or cleaned in time, the power of an engine is reduced, and the engine cannot be normally used seriously. However, the period of replacing or cleaning the fuel filter mainly depends on subjective judgment of a user, and the filter element is replaced or cleaned regularly according to experience, so that the blockage condition of the fuel filter element cannot be accurately judged. Therefore, two situations can be caused, firstly, the filter element is replaced in advance without reaching the service life, and unnecessary waste is caused; secondly, the filter element reaches the service life and is not replaced in time, so that the normal work of the engine is influenced.

At present, a mechanical differential pressure sensor is generally used for judging the blocking condition of a filter element, the judgment basis is that the blocking condition of the filter element is slight when the pressure difference of the oil inlet end and the oil outlet end of an oil pump is not large according to the pressure difference of the oil inlet end and the oil outlet end of the oil pump, and hydraulic oil can smoothly pass through the filter element; on the contrary, the blockage situation is serious, and the hydraulic oil is subjected to larger resistance when passing through the filter element.

In the prior art, a mechanical piston type structure is generally adopted for pressure sensing. When the differential pressure is lower than the indicated value, the differential pressure annunciator is not started; when the pressure difference reaches or is higher than the indicated value, the pressure difference annunciator is started to push the magnetic steel component to move, the micro switch is switched on, and a ground signal is output to realize the function of a product; when the pressure difference is reduced or disappears, the magnetic steel assembly resets under the action of the spring, the micro switch is switched off, and an on signal is output. The magnetic steel component is easy to be interfered by impurities in oil liquid to cause the increase of friction force, and a pressure difference annunciator using the magnetic steel component is insensitive to the induction of a smaller pressure difference value and has low detection precision.

Therefore, how to avoid the reduction of the sensitivity of the differential pressure sensing caused by the influence of the oil impurities and improve the accuracy of the differential pressure detection is a technical problem faced by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a high accuracy pressure difference signal ware can avoid being influenced by fluid impurity and lead to pressure difference to feel sensitivity and reduce, improves pressure difference detection precision.

For solving the technical problem, the utility model provides a high accuracy differential pressure annunciator, including well casing, with the procapsid that well casing links to each other, the low-pressure chamber with oil pump import intercommunication has been seted up in the procapsid, the high-pressure chamber with oil pump export intercommunication has been seted up in the well casing, the high-pressure chamber with separate mutually through the flexure strip between the low-pressure chamber, the flexure strip be provided with along axially extended ejector pin on the surface, be provided with micro-gap switch in the inner chamber of well casing, just the end of ejector pin is used for triggering when the both sides of flexure strip are because of pressure differential elastic deformation micro-gap switch.

Preferably, the portable electronic device further comprises a base, the middle shell is detachably arranged on the base, and the front shell is detachably connected with the middle shell.

Preferably, the front shell is sleeved on the outer wall of the middle shell, and the front shell is in threaded connection with the middle shell.

Preferably, the low-pressure cavity is arranged on the end face of the front shell, a high-pressure oil passage communicated with the oil pump outlet is axially arranged on the outer wall face of the front shell, and the high-pressure oil passage is communicated with the high-pressure cavity.

Preferably, install pressure regulating nut and spring in the low pressure chamber, pressure regulating nut's outer wall with the inner wall threaded connection in low pressure chamber, the one end of spring is connected on pressure regulating nut's the terminal surface, the other end of spring is connected on one side surface of flexure strip.

Preferably, the elastic sheet is laid on the cavity opening end face of the high-pressure cavity, and the ejector rod is connected to the center position of the other side surface of the elastic sheet.

Preferably, the elastic sheet is embodied as a flat membrane sheet.

Preferably, an adjusting bracket is axially movably arranged in the inner cavity of the middle shell, and the micro switch is mounted on the adjusting bracket.

Preferably, a trigger lever is arranged on the end face of the adjusting bracket, the inner side of the trigger lever is kept in abutting joint with a contact of the micro switch, and the outer side of the trigger lever is used for abutting joint with the tail end of the ejector rod.

The utility model provides a high accuracy differential pressure annunciator mainly includes well casing, procapsid, flexure strip, ejector pin and micro-gap switch. Wherein, the procapsid links to each other with well casing, has seted up the low-pressure chamber in the procapsid, has seted up the high-pressure chamber in well casing to low-pressure chamber and oil pump import intercommunication, low-pressure chamber and oil pump export intercommunication. The elastic sheet is arranged between the inlet of the high-pressure cavity and the outlet of the low-pressure cavity, and the high-pressure cavity and the low-pressure cavity are mutually separated, so that oil in the high-pressure cavity and the low-pressure cavity cannot circulate mutually. The ejector rod is arranged on the surface of the elastic sheet and is integrally positioned in the middle shell, and the ejector rod is mainly used for generating corresponding displacement along with the elastic deformation of the elastic sheet. The micro switch is arranged in the middle shell and is mainly used for being matched with the tail end of the ejector rod. Under normal conditions, the filter element is slightly blocked, the oil pressure at the inlet of the oil pump is almost equal to the oil pressure at the outlet of the oil pump, the pressures on the two sides of the elastic piece are roughly consistent, the elastic piece does not generate elastic deformation or slight elastic deformation, the ejector rod is further kept almost motionless, the relative position relation between the tail end of the ejector rod and the microswitch is kept fixed, and the microswitch does not start an alarm mechanism; under the abnormal condition, the filter element is seriously blocked, the oil pressure at the outlet of the oil pump is obviously greater than the oil pressure at the inlet of the oil pump, the surfaces at the two sides of the elastic sheet are stressed unevenly to generate arched elastic deformation, so that the ejector rod generates axial displacement, the relative position relation between the tail end of the ejector rod and the microswitch is changed, and the microswitch is triggered to send out an alarm. Compared with the prior art, the utility model discloses an easily deformable's flexure strip experiences the pressure differential of oil pump business turn over hydraulic fluid port to elastic deformation drive ejector pin through the flexure strip triggers micro-gap switch, can avoid fluid impurity to influence, prevents and pressure differential impression sensitivity reduces, improves pressure differential detection precision simultaneously.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a schematic overall structure diagram of a specific embodiment of the present invention.

Wherein, in fig. 1:

the device comprises a base-1, a middle shell-2, a front shell-3, an elastic sheet-4, a mandril-5, a microswitch-6, an adjusting bracket-7 and a trigger lever-8;

the high-pressure oil pump comprises a high-pressure cavity-21, a low-pressure cavity-31, a high-pressure oil channel-32, a pressure regulating nut-33 and a spring-34.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, fig. 1 is a schematic diagram of an overall structure of an embodiment of the present invention.

The utility model provides an among the specific implementation mode, high accuracy differential pressure annunciator mainly includes well casing 2, procapsid 3, flexure strip 4, ejector pin 5 and micro-gap switch 6.

Wherein, procapsid 3 links to each other with well casing 2, has seted up low-pressure chamber 31 in procapsid 3, has seted up high-pressure chamber 21 in well casing 2 to low-pressure chamber 31 communicates with the oil pump import, and low-pressure chamber 31 communicates with the oil pump export.

The elastic piece 4 is disposed between an inlet of the high pressure chamber 21 and an outlet of the low pressure chamber 31, and partitions the high pressure chamber 21 and the low pressure chamber 31 from each other so that oil in the two chambers cannot flow through each other.

The ejector rod 5 is arranged on the surface of the elastic sheet 4 and is integrally positioned in the middle shell 2, and is mainly used for generating corresponding displacement along with the elastic deformation of the elastic sheet 4. The micro switch 6 is arranged in the middle shell 2 and is mainly used for being matched with the tail end of the ejector rod 5.

Under normal conditions, the filter element is slightly blocked, the oil pressure at the inlet of the oil pump is almost equal to the oil pressure at the outlet of the oil pump, the pressures on the two sides of the elastic sheet 4 are approximately consistent, the elastic sheet 4 does not generate elastic deformation or slight elastic deformation, and the ejector rod 5 is almost kept still, so that the relative position relation between the tail end of the ejector rod 5 and the microswitch 6 is kept fixed, and the microswitch 6 does not start an alarm mechanism; under the abnormal condition, the filter element is seriously blocked, the oil pressure at the outlet of the oil pump is obviously greater than the oil pressure at the inlet of the oil pump, the surfaces at the two sides of the elastic sheet 4 are stressed unevenly and generate arch elastic deformation, so that the ejector rod 5 generates axial displacement, the relative position relation between the tail end of the ejector rod 5 and the microswitch 6 is changed, and the microswitch 6 is triggered to send out an alarm.

Compare in prior art, this embodiment feels the pressure differential of oil pump business turn over hydraulic fluid port through the flexure strip 4 that easily deforms to elastic deformation drive ejector pin 5 through flexure strip 4 triggers micro-gap switch 6, can avoid fluid impurity to influence, prevents and pressure differential perception sensitivity reduces, improves pressure differential detection precision simultaneously.

In order to facilitate the installation of the middle shell 2 and the front shell 3, the base 1 is additionally arranged in the embodiment. Specifically, the front shell 3, the middle shell 2 and the base 1 may be sequentially arranged along the axial direction and sequentially connected. The middle case 2 may be connected to the end surface of the base 1 by a snap structure or the like, and the front case 3 may also be detachably connected to the middle case 2. Generally, the front case 3 has a larger diameter than the middle case 2, so that the front case 3 can be fitted over the end surface of the middle case 2. And for the dismouting between convenient procapsid 3 and well casing 2, in this embodiment, the inner wall of procapsid 3 and the outer wall of well casing 2 can form threaded connection, so set up, when dismouting procapsid 3 and well casing 2, only need on well casing 2 screw in or screw out procapsid 3 can.

In a preferred embodiment with respect to the front housing 3, the low pressure chamber 31 may be particularly opened on an end surface of the front housing 3 and directly communicates with the oil Pump Inlet (PI) through the low pressure chamber 31. Specifically, the low pressure chamber 31 may be opened in the axial direction of the front housing 3. The high pressure chamber 21 may be specifically opened at a front end portion (non-end surface) of the middle housing 2, and for facilitating oil intake, oil inlets may be opened on both side walls of the high pressure chamber 21.

In order to facilitate the communication between the high pressure chamber 21 and the oil pump outlet, the high pressure oil passage 32 is formed in the outer wall surface of the front housing 3, and is communicated with the oil inlet of the high pressure chamber 21 through the high pressure oil passage 32. Specifically, an inlet of the high-pressure oil passage 32 may be opened on an outer wall surface of the front housing 3 and directly communicated with an oil Pump Outlet (PO), and the high-pressure oil passage 32 extends in an axial direction in an outer wall surface of the front housing 3 and extends all the way to an inner end surface of the front housing 3, thereby communicating with an oil inlet opened on a side wall of the middle housing 2.

Further, in the present embodiment, a pressure regulating nut 33 and a spring 34 are installed in the low pressure chamber 31. Specifically, the outer wall of the pressure regulating nut 33 is tightly abutted to the inner wall of the low pressure cavity 31, so that oil can be isolated, and the outer end face of the pressure regulating nut 33 only bears the oil pressure of the inlet of the oil pump. Meanwhile, one end of the spring 34 is attached to the inner end surface of the pressure regulating nut 33, and the other end of the spring 34 is attached to one side surface of the elastic sheet 4. So configured, the oil pressure at the oil pump inlet can be transmitted to the surface of the elastic sheet 4 by pushing the outer end surface of the pressure regulating nut 33 (although via the relief of the spring 34, it is negligible compared to the oil pressure). Moreover, be provided with the external screw thread on the outer wall of pressure regulating nut 33, and be provided with the internal thread on the internal face in low pressure chamber 31, so can make and form threaded connection between pressure regulating nut 33 and the low pressure chamber 31 to the accessible is twisted to the spiral of pressure regulating nut 33 and is moved, and regulating spring 34's pretightning force is in order to make things convenient for flexure strip 4 to kick-back sooner.

In a preferred embodiment of the elastic sheet 4, the elastic sheet 4 may be laid on the port end face of the high pressure chamber 21, seal the port of the high pressure chamber 21, and isolate the low pressure chamber 31. Meanwhile, the push rod 5 can be specifically connected to the central position of the other side surface of the elastic sheet 4, which is the oil pressure acting area in the low pressure cavity 31, so that the push rod 5 can be conveniently driven to make displacement motion. In general, the elastic sheet 4 may be a flat film sheet.

In addition, to facilitate the installation of the micro switch 6, the present embodiment has an adjusting bracket 7 installed in the inner cavity of the middle housing 2, and the micro switch 6 is installed in the adjusting bracket 7. Specifically, the outer wall of the adjusting support 7 and the inner wall of the middle shell 2 can form threaded connection, so that the adjusting support 7 can be driven to move axially in the middle shell 2 in a spiral adjusting mode, the axial position of the micro switch 6 is adjusted, and the distance between the micro switch 6 and the tail end of the ejector rod 5 is adjusted.

Further, a trigger lever 8 is provided on the end face of the adjusting bracket 7, the inner side of the trigger lever 8 is held in abutment with the contact of the micro switch 6, while the outer side of the trigger lever 8 is used to form abutment with the end of the plunger 5. Therefore, under normal conditions, the elastic sheet 4 is not deformed, the tail end of the ejector rod 5 is always kept in butt joint with the outer side of the trigger lever 8, the inner side of the trigger lever 8 is also always kept in butt joint with the contact of the micro switch 6, the micro switch 6 continuously outputs high level, and an alarm mechanism is not triggered; under abnormal conditions, the elastic sheet 4 deforms, the oil pressure in the high-pressure cavity 21 increases, the elastic sheet 4 deforms in an arched manner towards the low-pressure cavity 31, the ejector rod 5 moves along the axial direction (leftwards in the figure), the tail end of the ejector rod 5 is separated from the contact with the outer side of the trigger lever 8, the inner side of the trigger lever 8 is separated from the contact with the contact of the micro switch 6, the micro switch 6 starts to output low level, and the alarm mechanism is triggered.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a high accuracy differential pressure signal ware, its characterized in that, including well casing (2), with procapsid (3) that well casing (2) link to each other, low pressure chamber (31) with oil pump import intercommunication is seted up in procapsid (3), high pressure chamber (21) with oil pump export intercommunication are seted up in well casing (2), high pressure chamber (21) with separate each other through flexure strip (4) between low pressure chamber (31), the flexure strip (4) be provided with on the surface along axial extension's ejector pin (5), be provided with micro-gap switch (6) in the inner chamber of well casing (2), just the end of ejector pin (5) is used for the both sides of flexure strip (4) trigger when elastic deformation because of pressure differential micro-gap switch (6).

2. A high accuracy differential pressure signaler according to claim 1, further comprising a base (1), wherein said middle case (2) is detachably provided on said base (1), and said front case (3) is detachably connected to said middle case (2).

3. The high-precision differential pressure annunciator of claim 2, wherein the front housing (3) is sleeved on the outer wall of the middle housing (2), and the front housing (3) is in threaded connection with the middle housing (2).

4. The high-precision differential pressure annunciator of claim 1, wherein the low-pressure chamber (31) is opened on an end surface of the front housing (3), a high-pressure oil passage (32) communicating with the oil pump outlet is opened on an outer wall surface of the front housing (3) along an axial direction, and the high-pressure oil passage (32) communicates with the high-pressure chamber (21).

5. The high-precision differential pressure annunciator according to claim 4, characterized in that a pressure regulating nut (33) and a spring (34) are installed in the low-pressure chamber (31), the outer wall of the pressure regulating nut (33) is in threaded connection with the inner wall of the low-pressure chamber (31), one end of the spring (34) is connected to the end face of the pressure regulating nut (33), and the other end of the spring (34) is connected to one side surface of the elastic sheet (4).

6. The high-precision differential pressure annunciator according to claim 5, wherein the elastic sheet (4) is laid on the port end face of the high-pressure chamber (21), and the jack (5) is connected to the other side surface center position of the elastic sheet (4).

7. A high accuracy differential pressure signaler according to claim 6, wherein said elastic sheet (4) is embodied as a flat membrane.

8. A high accuracy differential pressure signaler according to any one of claims 1-7, wherein an adjustment bracket (7) is axially movably arranged in the inner cavity of the middle housing (2), and wherein the microswitch (6) is mounted on the adjustment bracket (7).

9. A high-precision differential pressure annunciator as claimed in claim 8, characterized in that a trigger lever (8) is arranged on the end face of the adjusting bracket (7), the inner side of the trigger lever (8) is kept in contact with the contact of the microswitch (6), and the outer side of the trigger lever (8) is used for being in contact with the tail end of the push rod (5).