CN210050129U - Low-temperature differential pressure signal transmitter - Google Patents

Abstract

The utility model discloses a low temperature differential signaling apparatus, and dust cover and last casing and lower casing cooperation installation are in the same place with retaining ring equipment, and sealed with the sealing washer, on the equipment, constitute signaling chamber in the inner chamber of casing down, working chamber and piston chamber, it is signaling chamber to go up casing upper portion, the piston chamber is located casing down, be equipped with the micro-gap switch subassembly in the signaling chamber, and the contact on the micro-gap switch subassembly mutually supports with the ejector pin of installation in the working chamber, micro-gap switch signal output end is connected with signal output plug input, and signal output end plug and alarm electric connection, and processing has the step hole of placing temperature locking device on the casing down. This technical scheme adds temperature locking device on traditional signalling device basis, and only the temperature reaches temperature locking device's settlement temperature range, reaches the opening pressure value that the product set for, and the signalling device just reports to the police, has overcome current filtration system and has easily appeared the false alarm message of changing the filter core when the low temperature starts.

Description

Low-temperature differential pressure signal transmitter

Technical Field

The utility model relates to a low temperature differential signaling device is applicable to signaling device and reports to the police and reminds the customer to use when changing corresponding accessories such as filter core.

Background

At present, the traditional signal transmitter in the hydraulic market has no requirement on the temperature during alarming, and when the hydraulic pressure machine works normally, the signal transmitter gives an alarm to prompt a user to replace a filter element in time as long as a set alarm pressure/pressure difference value is reached. However, when the filtering system is started at low temperature, the viscosity of the liquid is increased at low temperature, the flowability is poor, so that the flow resistance of the liquid is increased when the liquid flows through the filter, the pressure difference between the upstream and the downstream of the filter is increased, and at the moment, the pressure difference signal transmitter possibly sends out a false alarm message for replacing the filter element according to the detected pressure difference, so that the normal use of the pressure difference signal transmitter is influenced.

Patent number 201420080259.2 that the national patent office authorized, the name is "filter pressure difference signaling apparatus" and includes casing, slip subassembly and micro-gap switch, the last control iron sheet that is equipped with of micro-gap switch, the casing is equipped with the cavity, the slip subassembly is located and is separated into oil feed chamber and oil production chamber in the cavity, the slip subassembly is including being located the smooth core that oil production chamber, magnetism spare, elastic component and the regulation pole that is located oil feed chamber end, magnetism spare locate on the smooth core and with micro-gap switch's control iron sheet magnetic coordination, the elastic component is installed in the tip of smooth core, its characterized in that: the adjusting rod is axially connected with the sliding core in an adjustable mode, the adjusting rod is provided with a locking piece, and the locking piece and the sliding core are matched in a clamping mode to form axial limiting matching of the adjusting rod and the sliding core. When the sliding core is used, the adjusting rod is in threaded connection with the sliding core, and the locking piece is in threaded connection with the adjusting rod and is abutted against the end face of the sliding core. When the adjusting rod is rotated, the length of the adjusting rod on the sliding core is adjusted according to needs to control pressure difference, and the locking nut is connected to the periphery of the adjusting rod and screwed to the end face of the sliding core to achieve the purpose of locking. The disadvantages are as follows: the pressure difference is controlled by rotating the length of the adjusting rod on the sliding core, the adjusting method is not accurate, and the functions of locking temperature and alarming only by a signal transmitter when the opening pressure reaches the set pressure cannot be realized.

Disclosure of Invention

The utility model aims to provide a low temperature differential signaling device which can only give an alarm when the temperature reaches 70 ℃, the opening pressure reaches the set pressure of 0.5 +/-0.05 MPa and the signaling device alarm gives an alarm.

The utility model discloses a task is accomplished like this, including casing, lower casing, dust cover, last casing, and the dust cover with last casing and casing cooperation installation down and with retaining ring equipment together to seal with the sealing washer, its characterized in that: the dust cover is cylindrical, and the material selects organic glass, constitutes signaling chamber, working chamber and piston chamber in the inner chamber of the upper and lower casing that has assembled, go up casing upper portion and be signaling chamber, and the piston chamber is located casing down, be equipped with the micro-gap switch subassembly in the signaling chamber, and the ejector pin of installation in the contact on the micro-gap switch subassembly and the working chamber mutually supports, and micro-gap switch signal output part is connected with signal output plug input, and signal output part plug and alarm electric connection, and processing has the step hole of placing temperature locking device on the casing down, temperature locking device includes metal base and sheetmetal, and the sheetmetal welds in the metal base, and the extreme point degree of winding of sheetmetal is less than ejector pin external diameter. The signal output plug is fixed at the front end of the shell through a screw. The metal sheet is made of a thermal bimetallic sheet, and the end point winding degree of the metal sheet is smaller than the outer diameter of the ejector rod.

When the temperature is 70 ℃, the deformation of the metal sheet changes along with the temperature change, the end point winding degree is larger than the outer diameter of the ejector rod, the piston slowly moves upwards along with the increase of the pressure difference, when the pressure difference reaches 0.5 +/-0.05 MPa, the ejector rod moves downwards, the upper magnetic steel on the ejector rod is attracted with the lower magnetic steel on the piston, the ejector rod triggers a contact on a micro switch component in the signaling cavity, and the micro switch outputs a signal to the signal output plug alarm to alarm.

The utility model discloses has following effect: this technical scheme adds temperature locking device on traditional signalling device basis, and only the temperature reaches temperature locking device's settlement temperature range, simultaneously, reaches the opening pressure value that the product set for, and the signalling device just reports to the police, has overcome current filtration system and has easily appeared the false alarm message of changing the filter core when the low temperature starts.

Drawings

Fig. 1 is a schematic structural diagram of the present invention; FIG. 2 is a top view of the temperature lockout structure; fig. 3 is a schematic view of the structure of the metal sheet.

Description of the drawings: 1. rand, 2, the piston, 3, the piston chamber, 4, lower casing, 5, temperature locking device, 6, the dust cover, 7, go up the magnet steel, 8, the ejector pin, 9, go up the casing, 10, retaining ring, 11, micro-gap switch subassembly, 12, the signalling chamber, 13, screw, 14, signal output plug, 15, the working chamber, 16, lower magnet steel, 17, the spring, 18, low pressure medium passageway, 19, sealed rubber ring, 20, high pressure medium passageway, 31, low pressure chamber, 32, high pressure chamber, 51, the metal base, 52, the sheetmetal.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

The specific implementation example is shown in fig. 1 and fig. 2, in this embodiment, a low temperature differential pressure transmitter includes a lower housing 4, a dust cover 6, an upper housing 9, and the dust cover is installed in cooperation with the upper housing and the lower housing and assembled together with a fixing retaining ring 10 and sealed with a sealing ring, the dust cover is cylindrical, preferably made of organic glass, and has good see-through property, a transmitting cavity 12, a working cavity 15 and a piston cavity 3 are formed in inner cavities of the assembled upper and lower housings, the upper housing is a transmitting cavity, the piston cavity is located in the lower housing, a micro switch assembly 11 is arranged in the transmitting cavity, contacts on the micro switch assembly are matched with a push rod 8 installed in the working cavity, a signal output end of the micro switch is connected with an input end of a signal output plug 14, the signal output end plug is electrically connected with an alarm, the signal output plug is fixed at the front end of the housing 9 through a screw 13, and be equipped with the step hole with temperature locking device 5 matched with on the casing down, die the temperature locking device fixing clip on the casing down, temperature locking device includes metal base 51 and sheetmetal 52, and the sheetmetal welds in the metal base, and the temperature locking relies on the deflection of sheetmetal to change the realization at 70 ℃, and the sheetmetal adopts hot bimetallic strip material, and the extreme point of sheetmetal is around the degree and is lighter than ejector pin 8 external diameter size.

The piston 2 capable of reciprocating up and down is arranged in a piston cavity 3 of the lower shell, the lower magnetic steel 16 magnetically attracted with the upper magnetic steel 7 arranged on the ejector rod is arranged on the piston 2, the piston cavity is divided into a high-pressure cavity 32 and a low-pressure cavity 31 by the piston 2, the high-pressure cavity and the low-pressure cavity are sealed by a sealing ring 19, a high-pressure medium channel 20 communicated with the high-pressure cavity 32 and a low-pressure medium channel 18 communicated with the low-pressure cavity 31 are arranged on the lower shell 4, a spring 17 forcing the piston 2 to move towards the high-pressure cavity is further arranged on the lower shell, and a clamping ring 1 is fixedly arranged at the bottom of the piston on the cavity wall of the high-pressure cavity 32.

When the temperature of the differential pressure signaling device is lower than 70 ℃, the winding degree of the metal sheet is smaller than the outer diameter size of the ejector rod 8, at the moment, the ejector rod is supported by the metal sheet along with the increase of the differential pressure and cannot move downwards to touch the micro switch assembly, when the temperature is 70 ℃, the deformation of the metal sheet is changed along with the change of the temperature, the winding degree of the end point is larger than the outer diameter of the ejector rod, simultaneously, along with the increase of the differential pressure, the piston slowly moves upwards, when the differential pressure reaches 0.5 +/-0.05 MPa, the upper magnetic steel on the ejector rod 8 moves downwards is attracted with the lower magnetic steel on the piston, the contact on the micro switch assembly in the signaling cavity is touched by the ejector rod, and the micro switch outputs signals to the signal output plug alarm to.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected, and may communicate between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Claims (4)

1. The utility model provides a low temperature differential pressure signal transmitter, includes casing, lower casing, dust cover, goes up the casing, and the dust cover with last casing and lower casing cooperation installation and with retaining ring equipment together to seal with the sealing washer, its characterized in that: the dust cover is cylindrical, and the material selects organic glass, constitutes signaling chamber, working chamber and piston chamber in the inner chamber of the upper and lower casing that has assembled, go up casing upper portion and be signaling chamber, and the piston chamber is located casing down, be equipped with the micro-gap switch subassembly in the signaling chamber, and the ejector pin of installation in the contact on the micro-gap switch subassembly and the working chamber mutually supports, and micro-gap switch signal output part is connected with signal output plug input, and signal output part plug and alarm electric connection, and processing has the step hole of placing temperature locking device on the casing down, temperature locking device includes metal base and sheetmetal, and the sheetmetal welds in the metal base, and the extreme point degree of winding of sheetmetal is less than ejector pin external diameter.

2. The differential temperature pressure transmitter according to claim 1, wherein: the signal output plug is fixed at the front end of the shell through a screw.

3. The differential temperature pressure transmitter according to claim 1, wherein: the metal sheet is made of a thermal bimetallic sheet, and the end point winding degree of the metal sheet is smaller than the outer diameter of the ejector rod.

4. The differential temperature pressure transmitter according to claim 1, wherein: when the temperature is 70 ℃, the deformation of the metal sheet changes along with the temperature change, the end point winding degree is larger than the outer diameter of the ejector rod, the piston slowly moves upwards along with the increase of the pressure difference, when the pressure difference reaches 0.5 +/-0.05 MPa, the ejector rod moves downwards, the upper magnetic steel on the ejector rod is attracted with the lower magnetic steel on the piston, the ejector rod triggers a contact on a micro switch component in the signaling cavity, and the micro switch outputs a signal to the signal output plug alarm to alarm.

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