Differential pressure sensor for differential pressure detection of a water filter

Abstract

The utility model discloses a pressure difference sensor for water filter filtration pressure difference detection, including, upper end cover, upper end cover top fixedly connected with quick coupling no.

Description

Technical Field

[0001] This utility model relates to the field of filter differential pressure detection technology, and in particular to a differential pressure sensor for detecting the filtration differential pressure of a water filter. Background Technology

[0002] In today's home water purifier industry, real-time monitoring of the water filter's operating status is crucial for ensuring water quality and the normal operation of the equipment. Water pressure and differential pressure sensors play an indispensable role in this process. These sensors allow users to promptly understand the degree of clogging in the water filter, enabling automatic flushing or timely filter replacement, effectively improving the purification effect and lifespan of the water purifier.

[0003] Currently, various water pressure testing devices are available on the market. Common water pressure gauges are mostly pointer-type mechanical gauges, which can display water pressure readings directly, but because they cannot transmit the readings, they are unable to meet the needs of modern intelligent control and cannot function effectively in water purifier systems requiring automatic control or remote monitoring. In addition, there are remote-transmission water pressure gauges, which can indirectly transmit readings; however, these products have significant drawbacks such as large size and high price. Furthermore, when measuring water pressure difference, one gauge needs to be installed upstream and downstream of the filter, which undoubtedly further increases cost and installation difficulty, making them unsuitable for space-constrained and cost-sensitive household water purifiers. Utility Model Content

[0004] This application provides a differential pressure sensor for detecting the pressure difference in a water filter. By using an I-shaped movable block in conjunction with a weighing sensor, the pressure difference between the inlet and outlet of the water purifier filter can be known in real time, thereby understanding the degree of filter blockage and determining the replacement time of the water purifier filter.

[0005] This application provides a differential pressure sensor for detecting the filtration differential pressure of a water filter, including:

[0006] The top cover has a quick connector fixedly connected to it, and the quick connector communicates with the top cover.

[0007] The lower end cover is fixed to the upper end cover by bolts. A quick connector 2 is fixedly connected to the bottom of the lower end cover, and the quick connector 2 communicates with the lower end cover.

[0008] The annular block is located between the lower end cover and the upper end cover. The annular block is fixed between the upper end cover and the lower end cover by bolts. A lug is fixed on one side of the annular block, located on the outside of the upper and lower end covers. Rubber pads are provided on the top and bottom of the annular block.

[0009] An I-shaped movable block is located inside the annular block. The I-shaped movable block is positioned at the center of the intermediate cavity and between the upper and lower rubber pads. A mounting hole is provided on one side of the I-shaped movable block for mounting the bar weighing sensor.

[0010] A bar-shaped load cell is inserted into a mounting hole on an I-shaped movable block. The bar-shaped load cell bends as the I-shaped movable block moves, thereby sensing water pressure. The bar-shaped load cell includes an elastic bar and a load cell.

[0011] The elastic strip is made of steel sheet and is inserted into the mounting hole on the I-shaped movable block. The other side passes through the annular block and extends to its outer side, where it is fixed to the lug of the annular block. The load cell is installed on the top of the elastic strip. The load cell senses the deformation of the elastic strip, which causes a change in resistance value, thereby monitoring the water pressure between the upstream and downstream chambers.

[0012] Furthermore, the upper rubber pad is fixedly connected to the bottom of the upper end cover, and the lower rubber pad is fixedly connected to the top of the lower end cover. Through the partition of the rubber pad, the space inside the upper end cover, the lower end cover, and the annular block is divided into three independent cavities: the upstream cavity, the middle cavity, and the downstream cavity.

[0013] Further ring-shaped blocks and I-shaped movable blocks are all made of hard plastic.

[0014] A further elastic strip passes through the annular block and extends to its outer side. The side of the elastic strip that passes through is located above the annular block lug. The mounting hole on the elastic strip and the bolt hole reserved on the annular block lug are on the same axis. When the upper end cover and the lower end cover are assembled, the annular block is fixed in the middle with bolts, and then the elastic strip is fixed above the annular block lug with bolts.

[0015] The further weighing sensor consists of four thin-film resistors connected in a Wheatstone bridge configuration. The output line of the weighing sensor passes through the ring block to connect the power supply for the weighing sensor to operate.

[0016] One or more technical solutions provided in this application embodiment have at least the following technical effects or advantages: By using the I-shaped movable block in conjunction with the weighing sensor, the water pressure difference at the inlet and outlet of the water purifier filter can be known in real time, thereby understanding the degree of filter blockage and determining the replacement time of the water purifier filter. It is convenient and quick to use, compact in size, and highly practical. Since the upstream and downstream chambers are configured with the same size, what is detected is the direct relative differential pressure between the upstream and downstream, and there is no need to perform differential pressure calculation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the differential pressure sensor structure for detecting the differential pressure of the water filter in this application;

[0018] Figure 2 These are sectional views of the upper and lower end caps of this application;

[0019] Figure 3 This is a schematic diagram of the ring block structure of this application;

[0020] Figure 4 This is the main view of the elastic bar in this application;

[0021] Figure 5 This is a top view of the elastic strip in this application;

[0022] Figure 6 This is a schematic diagram of the weighing sensor structure of this application.

[0023] In the diagram: 1 Quick Connector I, 2 Quick Connector II, 3 Upper End Cover, 4 Lower End Cover, 5 Ring Block, 6 Rubber Gasket, 7 Bolt, 8 I-shaped Movable Block, 9 Elastic Strip, 10 Weighing Sensor, 11 Output Line of Weighing Sensor. Detailed Implementation

[0024] To facilitate understanding of this utility model, a more comprehensive description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0025] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Example 1

[0028] Please see Figure 1-6 A differential pressure sensor for detecting the filtration differential pressure of a water filter, comprising an upper end cover 3 and a lower end cover 4;

[0029] Specifically, the upper end cover 3 and the lower end cover 4 are fixed together by bolts 7. The top of the upper end cover 3 is fixedly connected to quick connector 1, which communicates with the upper end cover 3 for connecting the inlet or outlet of an external water filter. The bottom of the lower end cover 4 is fixedly connected to quick connector 2, which communicates with the lower end cover 4 for connecting the inlet or outlet of an external water filter.

[0030] The top and bottom caps, as well as quick connectors one and two, are all made of hard plastic.

[0031] The lower end cover 4 is equipped with an annular block 5 on its top. When the upper end cover 3 and the lower end cover 4 are assembled using bolts 7, the annular block 5 can be clamped and fixed between the upper end cover 3 and the lower end cover 4. A lug is fixed on one side of the annular block 5, located on the outside of the upper and lower end covers. Rubber pads 6 are provided on the top and bottom of the annular block 5. The upper rubber pad 6 is fixedly connected to the bottom of the upper end cover 3, and the lower rubber pad 6 is fixedly connected to the top of the lower end cover 4. The space inside the upper end cover 3, the annular block 5 and the lower end cover 4 is divided into three independent cavities by the partition of the rubber pads 6: the upstream cavity, the middle cavity and the downstream cavity. The rubber pads 6 are used as a water-proof sealing layer, so water in the upstream cavity will not enter the middle cavity, and water in the downstream cavity will not enter the middle cavity.

[0032] The cavity supported by the annular block 5 between the upper and lower rubber pads 6 is the middle cavity. The outer ring of the upper rubber pad 6 is pressed against the top of the annular block 5 via the upper end cap 3 to form the upstream cavity, and the outer ring of the lower rubber pad 6 is pressed against the bottom of the annular block 5 via the lower end cap 4 to form the downstream cavity.

[0033] The annular block 5 is equipped with an I-shaped movable block 8. The upper and lower ends of the I-shaped movable block 8 are flush with the upper and lower ends of the annular block 5, respectively. The I-shaped movable block 8 is located in the center of the intermediate cavity, that is, the I-shaped movable block 8 is located between the upper and lower rubber pads 6. The I-shaped movable block 8 is held in the center of the intermediate cavity by the upper and lower rubber pads 6. The I-shaped movable block 8 moves by sensing the water pressure difference between the upstream and downstream cavities through the rubber pads 6.

[0034] Both the ring block 5 and the I-shaped movable block 8 are made of hard plastic.

[0035] The upper and lower end caps represent the entire outer shell, and the annular block and the two themselves are not related; they are only used to indicate that the lugs are on the outside.

[0036] Water in the upstream cavity is introduced through quick connector 1. Due to the blockage of the upper rubber gasket 6, the water cannot flow to the middle cavity, causing the center of the rubber gasket 6 to bulge downward and push against the I-shaped movable block 8 below the rubber gasket 6 to move downward. In this way, the water pressure in the upstream cavity is transmitted to the I-shaped movable block 8, causing it to move downward.

[0037] Similarly, water in the downstream cavity is introduced through quick connector 2. Due to the obstruction of the lower rubber pad 6, the water cannot flow to the middle cavity, causing the center of the rubber pad 6 to bulge upward and push against the I-shaped movable block 8 above the rubber pad 6 to move upward. In this way, the water pressure in the downstream cavity is transmitted to the I-shaped movable block 8, causing it to move upward.

[0038] The I-shaped movable block 8 has a mounting hole for the elastic strip 9 on one side. A bar-shaped load cell is inserted into the mounting hole. One side of the bar-shaped load cell is inserted into the center of the I-shaped movable block 8, and the other side passes through the through hole in the wall of the annular block 5 and extends to its outer side, located above the annular block lug. The bar-shaped load cell is fixed to the annular block lug with bolts (that is, the bar-shaped load cell is fixed to the annular block lug with bolts). The bar-shaped load cell includes the elastic strip 9 and the load cell 10.

[0039] Specifically, the elastic strip 9 is made of steel sheet and has a certain deformation capacity. The elastic strip 9 is inserted into the mounting hole on the I-shaped movable block 8. The other side extends through the through hole opened in the wall of the annular block 5 to its outer side and is located above the annular block lug. The weighing sensor 10 is installed on the top of the elastic strip 9. The weighing sensor 10 senses the deformation of the elastic strip 9 and thus changes the resistance value to monitor the water pressure between the upstream and downstream chambers.

[0040] The elastic strip 9 passes through the through hole in the wall of the annular block 5 and extends to its outer side and is located above the annular block lug. The mounting hole on the elastic strip 9 and the bolt hole reserved on the annular block lug are on the same axis. When the upper end cover 3 and the lower end cover 4 are assembled, the annular block is fixed in the middle with bolts 7. The annular block lug is reserved on the outer side of the upper and lower end covers. Then, the elastic strip is fixed above the annular block lug with bolts. Since one side of the elastic strip 9 is fixed, the side of the elastic strip 9 inserted into the I-shaped movable block 8 will deform as the I-shaped movable block 8 moves.

[0041] The load cell 10 is composed of four thin-film resistors connected in a Wheatstone bridge configuration, which improves detection sensitivity.

[0042] The output line 11 of the load cell passes through the ring block 5 to connect the power supply to the load cell 10 for operation.

[0043] In actual operation of this embodiment, two independent water pipes are selected. One pipe is connected between the inlet of the water filter and quick connector 1, and the other pipe is connected between the outlet of the water filter and quick connector 2. Both the inlet and outlet are opened. Since the water cannot flow into the middle cavity due to the blocking effect of the rubber gasket 6, the water pressure is monitored according to the water pressure of the upstream and downstream cavities. If the upstream water pressure is high, the center of the upper rubber gasket 6 will bulge downward and push the I-shaped movable block 8 below the rubber gasket 6 downward, causing the elastic strip 9 to bend, thereby causing the load cell 10 attached to it to generate a resistance change, and output an analog voltage signal under the action of the excitation voltage.

[0044] Similarly, if the downstream water pressure is high, the center of the lower rubber pad 6 will bulge upwards, pushing the I-shaped movable block 8 above the rubber pad 6 upwards and causing the elastic strip 9 to bend, thereby causing the load cell 10 attached to it to generate a resistance change, and output an analog voltage signal under the action of the excitation voltage.

[0045] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. For those skilled in the art, various modifications and variations are possible with this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A differential pressure sensor for detecting differential pressure in a water filter, characterized in that: include, The top cover has a quick connector fixedly connected to it, and the quick connector communicates with the top cover. The lower end cover is fixed to the upper end cover by bolts. A quick connector 2 is fixedly connected to the bottom of the lower end cover, and the quick connector 2 communicates with the lower end cover. The annular block is located between the lower end cover and the upper end cover. The annular block is fixed between the upper end cover and the lower end cover by bolts. A lug is fixed on one side of the annular block, located on the outside of the upper and lower end covers. Rubber pads are provided on the top and bottom of the annular block. An I-shaped movable block is located inside the annular block. The I-shaped movable block is positioned at the center of the intermediate cavity and between the upper and lower rubber pads. A mounting hole is provided on one side of the I-shaped movable block for mounting the bar weighing sensor. The bar load cell is inserted into the mounting hole on the I-shaped movable block. The bar load cell bends as the I-shaped movable block moves, thereby sensing the water pressure.

2. The differential pressure sensor for detecting differential pressure in a water filter as described in claim 1, characterized in that: The rubber pad located on the upper side is fixedly connected to the bottom of the upper end cover, and the rubber pad on the lower side is fixedly connected to the top of the lower end cover. The space inside the upper end cover, the lower end cover, and the annular block is divided into three independent cavities by the partition of the rubber pad: the upstream cavity, the middle cavity, and the downstream cavity.

3. The differential pressure sensor for detecting differential pressure in a water filter as described in claim 1, characterized in that: Both the annular block and the I-shaped movable block are made of hard plastic.

4. The differential pressure sensor for detecting differential pressure in a water filter as described in claim 1, characterized in that: The bar weighing sensor includes an elastic bar and a weighing sensor; The elastic strip is made of steel sheet and is inserted into the mounting hole on the I-shaped movable block. The other side passes through the annular block and extends to its outer side, where it is fixed to the lug of the annular block. The load cell is installed on the top of the elastic strip. The load cell senses the deformation of the elastic strip, which causes a change in resistance value, thereby monitoring the water pressure between the upstream and downstream chambers.

5. The differential pressure sensor for detecting differential pressure in a water filter as described in claim 4, characterized in that: The elastic strip passes through the annular block and extends to its outer side. The side of the elastic strip that passes through is located above the annular block lug. The mounting hole on the elastic strip and the bolt hole reserved on the annular block lug are on the same axis. When the upper end cover and the lower end cover are assembled, the annular block is fixed in the middle with bolts, and then the elastic strip is fixed above the annular block lug with bolts.

6. The differential pressure sensor for detecting differential pressure in a water filter as described in claim 4, characterized in that: The load cell consists of four thin-film resistors connected in a Wheatstone bridge configuration. The output wire of the load cell passes through the ring block to connect the power supply for the load cell to operate.

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