CN108168764B - A hydraulic measuring device and water heater - Google Patents
A hydraulic measuring device and water heater Download PDFInfo
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- CN108168764B CN108168764B CN201711363924.8A CN201711363924A CN108168764B CN 108168764 B CN108168764 B CN 108168764B CN 201711363924 A CN201711363924 A CN 201711363924A CN 108168764 B CN108168764 B CN 108168764B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
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Abstract
本发明公开了一种液压测量装置及热水器，属于液压测量技术领域。液压测量装置包括具有开口的壳体，壳体内装有第二比重液体，壳体的底部内壁设有压力传感器；压力传感器全部沉浸在第二比重液体内，其中，第二比重液体的导热系数小于第一比重液体，第二比重大于第一比重；第一比重液体经由开口进入壳体，压力传感器通过第二比重液体测量第一比重液体的液压。本发明提供的液位测量装置采用导热系数较小且比重较大的液体将被测液体与压力传感器相隔绝，不仅可以使压力传感器正常感测被测液体的液压，同时还可以降低被测液体的高温温度对压力传感器的干扰影响，减小测量误差。
The invention discloses a hydraulic measurement device and a water heater, which belong to the technical field of hydraulic measurement. The hydraulic measuring device comprises a casing with an opening, a second specific gravity liquid is installed in the casing, and a pressure sensor is arranged on the bottom inner wall of the casing; the pressure sensors are all immersed in the second specific gravity liquid, wherein the thermal conductivity of the second specific gravity liquid is less than The first specific gravity liquid, the second specific gravity is greater than the first specific gravity; the first specific gravity liquid enters the casing through the opening, and the pressure sensor measures the hydraulic pressure of the first specific gravity liquid through the second specific gravity liquid. The liquid level measuring device provided by the present invention uses a liquid with a small thermal conductivity and a large specific gravity to isolate the liquid to be measured from the pressure sensor, which not only enables the pressure sensor to normally sense the hydraulic pressure of the liquid to be measured, but also reduces the pressure of the liquid to be measured. The high temperature will interfere with the pressure sensor and reduce the measurement error.
Description
Technical Field
The invention relates to the technical field of hydraulic measurement, in particular to a hydraulic measurement device and a water heater.
Background
At present, for water heating equipment such as boilers, water heaters and the like, the liquid level of heated water is an important parameter for safe operation of the equipment; in the liquid level measurement of part of water heating equipment in the prior art, the hydraulic pressure at the bottommost part of heated water is detected by a pressure sensor, and then liquid level data is obtained according to hydraulic conversion; in addition, the sensitivity of the pressure sensor is further reduced due to the impurity pollution in the heated water, and the corrosion problem of the body of the pressure sensor can also occur, so that the service life of the pressure sensor is influenced.
Disclosure of Invention
The invention provides a hydraulic measuring device and a water heater, and aims to solve the problem that a pressure sensor is easy to damage and malfunction when being measured in a high-temperature liquid environment. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.
According to a first aspect of the present invention, there is provided a hydraulic pressure measuring device for measuring a hydraulic pressure of a first specific gravity liquid, comprising a housing having an opening, the housing containing a second specific gravity liquid therein, a pressure sensor being provided on an inner wall of a bottom of the housing; the pressure sensor is completely immersed in the second specific gravity liquid, wherein the thermal conductivity of the second specific gravity liquid is less than that of the first specific gravity liquid, and the second specific gravity is greater than that of the first specific gravity liquid; a first specific gravity liquid enters the housing through the opening, and a pressure sensor measures a hydraulic pressure of the first specific gravity liquid through the second specific gravity liquid.
In an alternative embodiment, the hydraulic pressure measuring device further comprises a float floating on the level of the second specific gravity liquid, the float having a specific gravity less than the second specific gravity and greater than or equal to the first specific gravity.
In an alternative embodiment, the aperture of the opening is smaller than the smallest outer diameter of the float to confine the float within the housing.
In an alternative embodiment, the inner wall surface of the lower part of the shell is coated with a second coating which is compatible with the liquid with the second specific gravity, and the coating height of the second coating is matched with the liquid level height of the liquid with the second specific gravity; the upper inner wall surface of the housing is coated with a first coating which is compatible with the first specific gravity liquid.
In an alternative embodiment, the opening opens onto a top or side face of the housing.
According to a second aspect of the present invention, there is provided a water heater comprising a water storage liner and a hydraulic pressure measuring device as provided in any one of the above first aspects for measuring the water pressure in the water storage liner; the hydraulic measuring device is arranged at the bottom of the water storage liner, and the liquid level measuring device is communicated with the water storage liner through the opening.
The outer shell surface of the hydraulic measuring device is provided with a first thread, the bottom of the water heater is provided with a thread passage which is communicated with the water storage inner container, and the hydraulic measuring device is screwed in the thread passage.
The water heater also comprises a water inlet and a water outlet, and the hydraulic measuring device is positioned at the bottom of the water storage liner, which is far away from the water inlet and the water outlet.
The water heater also comprises a processor, and the processor is used for determining the liquid level height of the water in the water storage liner according to the pressure detected by the pressure sensor of the liquid level measuring device.
The second specific gravity liquid includes silicone oil.
The invention adopts the technical scheme and has the beneficial effects that:
the liquid level measuring device provided by the invention isolates the measured liquid from the pressure sensor by adopting the liquid with smaller heat conductivity coefficient and larger specific weight, so that the pressure sensor can normally sense the hydraulic pressure of the measured liquid, meanwhile, the interference influence of the high temperature of the measured liquid on the pressure sensor can be reduced, and the measuring error is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic illustration of the construction of the liquid level measuring device of the present invention according to an exemplary embodiment;
FIG. 2 is a schematic diagram of the structure of the water heater of the present invention shown in accordance with an exemplary embodiment.
Wherein, 1, a shell; 11. an opening; 2. a first specific gravity liquid; 3. a second specific gravity liquid; 4. a pressure sensor; 5. a float; 6. a water heater; 61. a water storage liner.
Detailed Description
The following description and the drawings sufficiently illustrate specific embodiments of the invention to enable those skilled in the art to practice them. Other embodiments may incorporate structural, logical, electrical, process, and other changes. The examples merely typify possible variations. Individual components and functions are optional unless explicitly required, and the sequence of operations may vary. Portions and features of some embodiments may be included in or substituted for those of others. The scope of embodiments of the invention encompasses the full ambit of the claims, as well as all available equivalents of the claims. Embodiments may be referred to herein, individually or collectively, by the term "invention" merely for convenience and without intending to voluntarily limit the scope of this application to any single invention or inventive concept if more than one is in fact disclosed. Herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method or apparatus that comprises the element. The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. As for the methods, products and the like disclosed by the embodiments, the description is simple because the methods correspond to the method parts disclosed by the embodiments, and the related parts can be referred to the method parts for description.
Fig. 1 is a schematic structural view of a hydraulic pressure measuring apparatus of the present invention according to an exemplary embodiment.
As shown in fig. 1, the present invention provides a hydraulic pressure measuring device, which can be applied to heating equipment such as a hot water boiler and a water heater, etc., for measuring the hydraulic pressure of a heated liquid in the heating equipment, and further calculating the liquid level height of the heated liquid according to the hydraulic pressure; in the embodiment, the type of liquid to be heated in the heating apparatus is not limited to water, and for convenience of description hereinafter, the heated liquid is defined herein as the first specific gravity liquid 2, that is, the hydraulic pressure measuring device of the present invention measures the hydraulic pressure of the first specific gravity liquid 2, such as the hydraulic pressure of the heated water when the heating apparatus to which the hydraulic pressure measuring device is applied is a water heater, and the first specific gravity is the specific gravity of water itself.
Specifically, the hydraulic pressure measuring apparatus of the present invention mainly includes:
the shell 1, the shell 1 is a hollow structure, and has an opening 11 for the first specific gravity liquid 2 to flow into the shell 1. In the illustrated embodiment, the housing 1 is a cylindrical semi-closed structure, the opening 11 is opened on the top surface of the cylindrical housing 1, and the first heavy liquid 2 can flow into or out of the housing 1 from the opening 11 on the top surface; in other embodiments, the openings 11 may be opened on the side of the cylindrical housing 1, and preferably, the openings 11 opened on the side are plural in number and arranged at intervals along the longitudinal direction of the housing 1, which is advantageous in that, since the hydraulic pressure measuring device is generally installed on the bottom of the heating chamber of the heating apparatus, and the bottom of the heating chamber tends to deposit many impurities mixed with the heated liquid, therefore, in order to avoid the problem that the impurities block the single opening 11 of the housing 1 with single opening 11, so that the first heavy liquid 2 cannot flow into or out of the housing 1 through the opening 11, the plural openings 11 provided on the side of the present invention can prevent the first heavy liquid 2 from normally flowing into or out of the housing 1 through the other openings 11 when one or several of the openings 11 are blocked, and at the same time, among the plural openings 11 arranged longitudinally, the opening 11 above can keep a certain distance from the bottom of the heating chamber, the problem of impurities mixing into the housing 1 and clogging the opening 11 can also be reduced.
A second specific gravity liquid 3 filled in the casing 1, wherein in the embodiment, the second specific gravity liquid 3 is not filled in the inner space of the casing 1, but filled in the lower space of the casing 1, so that the upper space of the casing 1 is used as the containing space for the inflowing first specific gravity liquid 2; wherein the second specific gravity liquid 3 has a thermal conductivity lower than that of the first specific gravity liquid 2, that is, the second specific gravity liquid 3 has a temperature change rate lower than that of the first specific gravity liquid 2, so that the temperature change of the second specific gravity liquid 3 lags behind the temperature change of the first specific gravity liquid 2 when the first specific gravity liquid 2 is heated; and, the second specific gravity is greater than the first specific gravity, namely the density of the second specific gravity liquid 3 is greater than that of the first specific gravity liquid 2, so, after the first specific gravity liquid 2 flows into the shell 1 through the opening 11, the second specific gravity liquid 3 with the larger specific gravity can still accumulate in the lower space of the shell 1, the first specific gravity liquid 2 with the smaller specific gravity floats on the upper space of the shell 1 and above the second specific gravity liquid 3, the first specific gravity liquid 2 can not or only slightly seep into the second specific gravity liquid 3, the two liquids with different specific gravities are obviously layered in the shell 1, the first specific gravity liquid 2 is at the upper layer, and the second specific gravity liquid 3 is at the lower layer.
The pressure sensor 4 is arranged on the inner wall of the bottom of the shell 1, the pressure sensor 4 is completely immersed in the second specific gravity liquid 3, and the second specific gravity liquid 3 is used as a liquid blocking layer, so that the first specific gravity liquid 2 cannot be in direct contact with the pressure sensor 4; at the same time, the first specific gravity liquid 2 enters the housing 1 through the opening 11, and the pressure sensor 4 measures the hydraulic pressure of the first specific gravity liquid 2 by the second specific gravity liquid 3.
The following is a description of a specific assembly structure of the hydraulic pressure measuring device and the heating apparatus and a pressure measuring process according to the present invention.
The heating device generally has a heating chamber for receiving a liquid to be heated, and heats the liquid to a preset temperature in the heating chamber; in the embodiment, in order to ensure that the maximum hydraulic pressure of the liquid to be heated can be measured, the hydraulic pressure measuring device is arranged at the bottom of the heating cavity of the heating equipment, and the opening 11 of the hydraulic pressure measuring device is communicated with the internal space of the heating cavity, so that the liquid to be heated at the bottom of the heating cavity can enter the shell 1 from the heating cavity, and meanwhile, the hydraulic pressure at the bottom is also transmitted into the shell 1; specifically, the heating cavity is filled with a first specific gravity liquid 2, the first specific gravity liquid 2 is contacted with a second specific gravity liquid 3 filled in the shell 1 after entering the shell 1, the hydraulic pressure of the first specific gravity liquid 2 is transmitted to the second specific gravity liquid 3, then the second specific gravity liquid 3 continuously transmits the hydraulic pressure to a pressure sensor 4 immersed in the second specific gravity liquid 3, and therefore the pressure sensor 4 can detect and obtain the hydraulic data of the first specific gravity liquid 2.
Further, as can be seen from the hydraulic pressure calculation formula P ═ ρ gh, the hydraulic pressure actually detected by the pressure sensor 4 of the present invention is P ═ ρ gh (ρ ═ ρ gh)1*h1+ρ2*h2) G, where P is the hydraulic pressure measured by the pressure sensor 4, P1For heating the density, h, of the first specific gravity liquid 2 in the chamber1For heating the level of the first specific gravity liquid 2 in the chamber, p2Density, h, of the second specific gravity liquid 3 filled in the casing 12The liquid level height of the second specific gravity liquid 3 filled in the shell 1, and g is a gravity coefficient; in an embodiment, the density ρ of the first specific weight liquid 21Density ρ of the second specific gravity liquid 3 filled in the casing 12And the height h of the liquid level2It is known that the level h of the first specific-weight liquid 2 in the heating chamber can be calculated from the hydraulic pressure P detected by the pressure sensor1。
It should be understood that, in the above hydraulic pressure and liquid height calculation processes, the influence of the temperature change on the liquid density is ignored, i.e. the liquid level measuring device is suitable for a liquid level measuring scene in which the liquid density is insensitive and not significant along with the temperature change; the steam pressure in the heating cavity where the first specific weight liquid 2 is positioned is set to not change the total air pressure on the liquid surface; if the liquid level measuring device is used for a closed liquid container and the steam pressure can affect the total air pressure of the liquid level, an air pressure measuring device can be additionally arranged in the heating cavity to additionally measure the actual air pressure on the liquid level of the first specific gravity liquid 2 so as to correct the hydraulic data detected by the pressure sensor in the calculation, thereby ensuring the accuracy of the calculation of the liquid level height.
Alternatively, in the embodiment, compared with a heating cavity with a larger volume, the overall size of the hydraulic measuring device of the present invention is designed to be smaller, the height distance between the liquid level of the second specific gravity liquid 3 filled in the housing 1 and the pressure sensor 4 is known, and the height value is smaller, generally within 5cm, therefore, in some optional calculation modes, the pressure caused by the second specific gravity liquid 3 can be removed in the displayed formula by the adjustment method of the pressure measurement zero point, and the calculated h can be used as the height of the first specific gravity liquid 2 to be measured directly according to the formula h which is equal to P/ρ g.
In the present embodiment, the thermal conductivity of the second specific gravity liquid 3 is smaller than the thermal conductivity of the first specific gravity liquid 2, and therefore, when the pressure sensor 4 detects the pressure of the first specific gravity liquid 2 being heated or already at a higher temperature, since the pressure sensor 4 is entirely immersed in the second specific gravity liquid 3, the temperature change of the second specific gravity liquid 3 lags behind the temperature change of the first specific gravity liquid 2, and therefore, by the blocking of the second specific gravity liquid 3, a certain degree of high temperature protection effect can be exerted on the pressure sensor 4, the interference of the high temperature to the pressure sensor 4 is reduced, and the detection error of the pressure sensor 4 is reduced.
In the embodiment, after the first specific gravity liquid 2 in the heating cavity provided by the hydraulic pressure measuring device is heated, the first specific gravity liquid 2 is conveyed to other equipment requiring the high-temperature liquid, and meanwhile, the low-temperature first specific gravity liquid 2 is replenished into the heating cavity again, so that disturbance of the first specific gravity liquid 2 in the heating cavity is often accompanied in the processes of flowing out the high-temperature liquid and replenishing the low-temperature liquid, and in the case of severe disturbance, the second specific gravity liquid 3 in the housing 1 may flow out from the opening 11 to the heating cavity, and the first specific gravity liquid 2 in the heating cavity is polluted; therefore, in order to prevent the second specific gravity liquid 3 from flowing out through the opening 11, the hydraulic pressure measuring apparatus of the present invention further comprises a float 5 provided in the housing 1, the float 5 having a specific gravity smaller than the second specific gravity and equal to or greater than the first specific gravity, so that the float 5 can float on the surface of the second specific gravity liquid 3, and the float 5 can attenuate the fluctuation of the first specific gravity liquid 2 transferred into the housing 1 to reduce the influence of the fluctuation of the second specific gravity liquid 3 caused by the disturbance of the first specific gravity liquid 2.
Preferably, the aperture of the opening 11 of the housing 1 is smaller than the minimum outer diameter of the float 5, so as to confine the float 5 inside the housing 1; thus, when the second specific gravity liquid 3 tends to flow in the direction of the opening 11, the float 5 on the liquid surface also moves in the direction of the opening 11 in synchronization, and when the float 5 moves to the position of the opening 11, the float 5 cannot come out of the opening 11 and is stopped at the position of the opening 11, so that the second specific gravity liquid 3 is prevented from flowing to the outside.
Alternatively, the float 5 may be in the form of a sphere, cone, or arc, and the invention is not limited thereto. When a spherical float 5 version is used, the maximum caliber of the opening 11 of the housing 1 should be smaller than the diameter of the spherical float 5.
In some embodiments, the lower inner wall surface of the casing 1 is coated with a second coating having affinity for the second specific gravity liquid 3, the second coating can improve the adhesion of the second specific gravity liquid 3 to the lower inner wall surface, so that the second specific gravity liquid 3 can reside in the lower space, and the permeation movement of the second specific gravity liquid 3 to the upper space is reduced, and the coating height of the second coating is the same as the liquid level height of the filled second specific gravity liquid 3, or slightly higher than the liquid level height of the second specific gravity liquid 3.
Similarly, the upper inner wall surface of the housing 1 is coated with the first coating having affinity for the first specific gravity liquid 2, and it is also possible to improve the adhesion of the first specific gravity liquid 2 to the upper inner wall surface, so that the first specific gravity liquid 2 can reside in the upper space, reducing the osmotic movement of the first specific gravity liquid 2 to the lower space.
In this embodiment, the hydraulic pressure measuring device may be configured to seal the opening 11 of the housing 1 with a film or an end cap after the second specific gravity liquid 3 is filled, so as to prevent the hydraulic pressure measuring device from spilling out of the opening 11 during transportation.
In other embodiments, the opening 11 of the housing 1 may be covered with a semi-permeable membrane, which is capable of allowing the first specific gravity liquid 2 to pass through and blocking the second specific gravity liquid 3, so that the semi-permeable membrane can make the second specific gravity liquid 3 completely remain inside the housing 1, thereby avoiding the problem of the second specific gravity liquid 3 being extravasated.
FIG. 2 is a schematic diagram of the structure of the water heater of the present invention shown in accordance with an exemplary embodiment.
According to the second aspect of the present invention, there is also provided a water heater 6, comprising a water storage container 61 capable of containing water and a hydraulic pressure measuring device as provided in the above embodiment, wherein the hydraulic pressure measuring device is capable of measuring the water pressure in the water storage container 61 of the water heater 6, and further calculating the water level height in the water storage container 61 according to the measured water pressure, so as to determine the actual water storage amount in the water storage container 61.
Specifically, the hydraulic pressure measuring device is disposed at the bottom of the water storage liner 61, and the liquid level measuring device is communicated with the water storage liner 61 through the opening 11, so that the water in the water storage liner 61 can flow into or out of the housing 1 through the opening 11, and in this embodiment, the water is the first specific gravity liquid 2 in the foregoing embodiment.
In the embodiment, a first thread is arranged on the outer shell surface of the hydraulic measuring device, a thread passage penetrating through the water storage inner container 61 is formed in the bottom of the water heater 6, the hydraulic measuring device is screwed in the thread passage, and the relative position of the pressure sensor 4 and the bottom of the water storage inner container 61 can be adjusted by adjusting the screwing depth of the hydraulic measuring device, so that the height position of the pressure sensor 4 is always below the height position of the bottom of the water storage inner container 61, and the hydraulic pressure measured by the pressure sensor 4 can be equal to or close to the actual maximum hydraulic pressure at the bottom of the water storage inner container 61.
Preferably, the water heater 6 further comprises a water inlet and a water outlet, and the hydraulic measuring device is located at the bottom of the water storage liner 61 far away from the water inlet and the water outlet, so as to reduce the influence of water flow disturbance in the water outlet or water replenishing process of the water heater 6 on the fluctuation of the second specific gravity liquid 3 in the hydraulic measuring device.
In this embodiment, the water heater 6 further includes a processor, the processor is configured to determine the liquid level height of the water according to the pressure detected by the pressure sensor 4 of the liquid level measuring device, and the specific calculation process of the liquid level height may refer to the disclosure of the foregoing embodiments, which is not described herein again.
Alternatively, when the first specific gravity liquid 2 is water, the second specific gravity liquid 3 comprises silicone oil, preferably, the filling height of the silicone oil in the housing 1 is about 5cm, and the type of silicone oil is preferably methylated branched silicone oil.
It is to be understood that the present invention is not limited to the procedures and structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (10)
1. A hydraulic pressure measuring device is used for measuring the hydraulic pressure of a first specific gravity liquid and is characterized by comprising a shell with an opening, wherein a second specific gravity liquid is filled in the shell, and the inner wall of the bottom of the shell is provided with a pressure sensor; the pressure sensor is entirely immersed in the second specific gravity liquid, wherein the second specific gravity liquid has a thermal conductivity less than that of the first specific gravity liquid and a second specific gravity greater than that of the first specific gravity liquid; the first specific gravity liquid enters the housing through the opening, and the pressure sensor measures the hydraulic pressure of the first specific gravity liquid by the second specific gravity liquid.
2. The hydraulic measurement device of claim 1, further comprising a float that floats on the level of the second specific gravity liquid, the float having a specific gravity that is less than the second specific gravity and greater than or equal to the first specific gravity.
3. A hydraulic measuring device according to claim 2, wherein the aperture of the opening is smaller than the smallest outer diameter of the float to confine the float within the housing.
4. The hydraulic pressure measuring apparatus according to claim 1, wherein a lower inner wall surface of the housing is coated with a second coating layer that is compatible with the second specific gravity liquid, and a coating height of the second coating layer is adapted to a liquid level height of the second specific gravity liquid; an upper inner wall surface of the housing is coated with a first coating that is compatible with the first specific gravity liquid.
5. A hydraulic measuring device according to claim 1, wherein the opening opens on a top or side surface of the housing.
6. A water heater is characterized by comprising a water storage inner container and a hydraulic pressure measuring device which is used for measuring the water pressure in the water storage inner container and is defined in any one of claims 1 to 5; the hydraulic measuring device is arranged at the bottom of the water storage inner container and is communicated with the water storage inner container through the opening.
7. The water heater according to claim 6, wherein a first thread is arranged on the outer shell surface of the hydraulic pressure measuring device, a thread passage penetrating to the water storage inner container is arranged at the bottom of the water heater, and the hydraulic pressure measuring device is screwed in the thread passage.
8. The water heater of claim 6, further comprising a water inlet and a water outlet, wherein the hydraulic measuring device is located at a bottom position of the water storage bladder remote from the water inlet and the water outlet.
9. The water heater of claim 6, further comprising a processor for determining a level of water within the water storage bladder based on the pressure detected by the pressure sensor of the hydraulic pressure measuring device.
10. The water heater of claim 6, wherein the second specific gravity liquid comprises silicone oil.
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| CN103575357A (en) * | 2012-08-02 | 2014-02-12 | 罗斯蒙德公司 | Level measurement of process fluid using a remote seal |
| CN203719819U (en) * | 2014-02-24 | 2014-07-16 | 中国神华能源股份有限公司 | Differential pressure measuring device |
| CN106461480A (en) * | 2014-02-28 | 2017-02-22 | 测量专业股份有限公司 | Differential pressure sensor |
| CN206387470U (en) * | 2016-10-13 | 2017-08-08 | 吉林师范大学 | Liquid level emasuring device |
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