Device for testing effective bulk modulus of diesel oil

Abstract

The invention provides a diesel effective volume modulus testing device which comprises a high-pressure pressure pump and an oil tank, the oil tank is divided into two pipelines which are respectively connected to an output interface, one pipeline is connected to the output interface through a first hand valve pipeline after sequentially passing through a low-pressure hand pump, a second hand valve and the high-pressure pressure pump, and the other pipeline is connected to the output interface through a second hand valve pipeline. The other pipeline passes through a third hand valve and then is connected to the output connector through a first hand valve pipeline, and a pressure sensor is installed at the converging position of the third hand valve, the first hand valve and the high-pressure pressure pump. According to the device for testing the effective volume modulus of the diesel oil, the pressure change value corresponding to the unit volume change is obtained by measuring the diesel oil pressure values corresponding to different displacements of the plunger in the compression stroke of the high-pressure pressure pump, and then the pressure change curve of the effective volume modulus of the diesel oil is obtained, so that the measurement precision is improved, and the measurement cost is reduced. And the testing device is simplified, the processing requirement is reduced, and the testing cost is saved.

Description

Technical Field

[0001] The invention belongs to the technical field of liquid effective bulk modulus measurement, and in particular relates to a testing device for diesel effective bulk modulus. Background Art

[0002] There are three main types of existing diesel effective bulk modulus test devices. The first type is a fluid bulk modulus measurement sensor designed using the relationship between pressure and deformation of piezoelectric materials. The second type is a test device designed based on the influence of the effective bulk modulus of oil on the propagation of pressure waves in the oil. The third type is a test device designed based on the linear relationship between the bulk modulus of oil and the pressure difference between the inlet and outlet of its oil pipeline. However, the first type of test device has poor measurement accuracy due to the small deformation of the piezoelectric sensor; the hydraulic test platform of the second type of device is relatively complex; and the third type of measurement method is expensive. Summary of the invention

[0003] In view of this, the present invention aims to propose a test device for the effective bulk modulus of diesel, so as to provide a test device for the effective bulk modulus of diesel with high measurement accuracy and low testing cost.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0005] A testing device for diesel effective bulk modulus comprises a high-pressure pressure pump and a fuel tank, wherein the fuel tank is divided into two pipelines respectively connected to output interfaces, one pipeline passes through a low-pressure hand pump, a second hand valve, and a high-pressure pressure pump in sequence and then is connected to the output interface via a first hand valve pipeline, and the other pipeline passes through a third hand valve and then is connected to the output interface via the first hand valve pipeline, and a pressure sensor is installed at the confluence of the third hand valve, the first hand valve, and the high-pressure pressure pump.

[0006] Furthermore, the high-pressure pressure pump is a plunger pressurizing mechanism, and the plunger sleeve of the high-pressure pressure pump is marked with scale values; by turning the handle of the high-pressure pressure pump, the plunger is driven to move forward, and the test system is gradually pressurized, so that the diesel is gradually compressed. By reading the scale values ​​of the plunger sleeve of the high-pressure pressure pump, the volume change of the diesel corresponding to different compression states can be seen.

[0007] Furthermore, a second one-way valve is installed at the oil inlet of the high-pressure pressure pump, and a first one-way valve is installed at the oil outlet.

[0008] Furthermore, the pressure sensor can accurately collect the pressure values ​​of high-pressure diesel under different compression states; the obtained diesel pressure value is combined with the following diesel effective bulk modulus, that is, the correlation between diesel volume and pressure, to obtain the diesel effective bulk modulus value under different pressure values;

[0009]

[0010] Where p is the diesel pressure; v is the total volume of diesel.

[0011] Compared with the prior art, the diesel effective bulk modulus testing device of the present invention has the following advantages:

[0012] (1) The test device for the effective bulk modulus of diesel described in the present invention measures the diesel pressure values ​​corresponding to different displacements of the plunger of the high-pressure pressure pump during the compression stroke, obtains the pressure change value corresponding to the unit volume change, and then solves the pressure change curve of the effective bulk modulus of diesel. This not only improves the measurement accuracy, but also simplifies the test device, reduces the processing requirements, and saves the test cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0014] Figure 1 Schematic diagram of a test device for the effective bulk modulus of diesel according to an embodiment of the present invention.

[0015] Description of reference numerals:

[0016] 1- high-pressure pressure pump; 2- low-pressure hand pump; 3- first one-way valve; 4- second one-way valve; 5- pressure sensor; 6- first hand valve; 7- second hand valve; 8- third hand valve; 9- output interface; 10- oil tank. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0019] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] A test device for diesel effective bulk modulus, such as Figure 1 As shown, it includes a high-pressure pressure pump 1, a low-pressure hand pump 2, a first one-way valve 3, a second one-way valve 4, a pressure sensor 5, a first hand valve 6, a second hand valve 7, a third hand valve 8, an output interface 9 and an oil tank 10. The oil tank 10 is divided into two pipelines connected to the output interface 9 respectively. One pipeline passes through the low-pressure hand pump 2, the second hand valve 7, and the high-pressure pressure pump 1 in sequence and is connected to the output interface 9 through the first hand valve 6 pipeline. The other pipeline passes through the third hand valve 8 and is connected to the output interface 9 through the first hand valve 6 pipeline. The pressure sensor 5 is installed at the confluence of the third hand valve 8, the first hand valve 6 and the high-pressure pressure pump 1; the high-pressure pressure pump 1 is a plunger pressurizing device, and its plunger sleeve is marked with a scale value. The second one-way valve 4 is installed at the oil inlet of the high-pressure pressure pump 1, and the first one-way valve 3 is installed at the oil outlet.

[0022] The high-pressure pressure pump 1 is a plunger pressurizing device. By turning the handle of the high-pressure pressure pump 1, the plunger is driven to move forward, gradually pressurizing the test system so that the diesel is gradually compressed. By reading the scale value of the plunger sleeve of the high-pressure pressure pump 1, the volume change of the diesel corresponding to different compression states is calculated.

[0023] The pressure sensor 5 is installed on the high-pressure pipeline to accurately collect the pressure values ​​of high-pressure diesel under different compression states; the obtained diesel pressure value is combined with the following diesel effective bulk modulus calculation formula, that is, the correlation between diesel volume and pressure, to obtain the diesel effective bulk modulus value under different pressure values;

[0024]

[0025] Where p is the diesel pressure; v is the total volume of diesel.

[0026] Based on the above diesel effective bulk modulus value, the functional relationship between diesel effective bulk modulus and diesel pressure is solved to obtain the pressure variation curve of diesel effective bulk modulus.

[0027] The low-pressure hand pump 2 delivers the low-pressure diesel in the fuel tank 10 to the output interface 9 and the test workpiece to complete the exhaust work and ensure that the system is full of diesel.

[0028] The second hand valve 7 and the second one-way valve 4 are installed at the oil inlet of the high-pressure pressure pump 1, and the third hand valve 8 is installed at the oil inlet of the fuel tank 10, so that the total mass of the diesel being tested does not change during the diesel compression process of the high-pressure pressure pump 1.

[0029] The plunger sleeve structure of the high-pressure pressure pump 1 and the pipeline structure of the testing device have high strength and do not deform under high pressure.

[0030] Working principle of a diesel effective bulk modulus test device:

[0031] When testing:

[0032] Close the third hand valve 8, open the first hand valve 6 and the second hand valve 7, start the low-pressure hand pump 2, and deliver the low-pressure diesel in the fuel tank 10 to the test device until the low-pressure diesel overflows from the oil outlet of the output interface 9, thereby eliminating the air in the measurement system, and then close the second hand valve 7 to ensure that the total mass of diesel in the system remains unchanged. Start the high-pressure pressure pump 1, and the diesel is gradually compressed. By recording the volume change of diesel under different pressures, the effective bulk modulus of diesel under different pressure values ​​is obtained by using the calculation formula of diesel effective bulk modulus, and then the functional relationship between diesel effective bulk modulus and diesel pressure is solved to obtain the pressure change curve of diesel effective bulk modulus, so that the accurate value of the effective bulk modulus of diesel under a certain pressure can be directly read. The measuring device effectively reduces the difficulty and cost of testing the curve of diesel elastic modulus changing with pressure.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test device for diesel effective bulk modulus, characterized in that: It includes a high-pressure pressure pump and an oil tank. The oil tank is divided into two pipelines which are respectively connected to the output interface. One pipeline passes through a low-pressure hand pump, a second hand valve, and a high-pressure pressure pump in sequence and then is connected to the output interface through a first hand valve pipeline. The other pipeline passes through a third hand valve and then is connected to the output interface through the first hand valve pipeline. A pressure sensor is installed at the confluence of the third hand valve, the first hand valve and the high-pressure pressure pump.

2. A diesel effective bulk modulus testing device according to claim 1, characterized in that: The high-pressure pressure pump is a plunger pressurizing mechanism, and the plunger sleeve of the high-pressure pressure pump is marked with scale values. Turning the handle of the high-pressure pressure pump drives the plunger to move forward, gradually pressurizing the test system, so that the diesel is gradually compressed. By reading the scale value of the plunger sleeve of the high-pressure pressure pump, the volume change of the diesel corresponding to different compression states can be seen.

3. A diesel effective bulk modulus testing device according to claim 1, characterized in that: The oil inlet of the high-pressure pressure pump is equipped with a second one-way valve, and the oil outlet is equipped with a first one-way valve.

4. A diesel effective bulk modulus testing device according to claim 1, characterized in that: The pressure sensor can accurately collect the pressure value of high-pressure diesel under different compression states; the diesel pressure value obtained is combined with the following diesel effective bulk modulus, that is, the correlation between diesel volume and pressure, to obtain the diesel effective bulk modulus value under different pressure values; Where p is the diesel pressure; v is the total volume of diesel.

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