Engine internal pressure testing device

Abstract

The utility model discloses an engine internal pressure testing device which comprises a base, a U-shaped glass tube is arranged on the base, measuring liquid is filled in the U-shaped glass tube, the measuring liquid is purified water, a transparent rubber tube is fixedly connected to one end of the U-shaped glass tube, and an oil filler cap is arranged at one end, far away from the U-shaped glass tube, of the transparent rubber tube. Measurement liquid is injected into the U-shaped glass tube, one end of the U-shaped glass tube is communicated with the atmosphere, the other end of the U-shaped glass tube is connected with the oil filler cap through the transparent rubber tube, and the oil filler cap is installed on the cylinder head cover of the engine. The liquid level of the end, communicated with the atmosphere, in the U-shaped glass tube rises, the liquid level of the end, connected with the oil filler cap, in the U-shaped glass tube descends, the liquid level in the U-shaped glass tube has height difference, and finally the internal pressure of the engine is directly obtained according to the height difference.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of diesel engine, especially a kind of engine internal pressure testing device. BACKGROUND

[0002] Engine needs to monitor, test its internal pressure in the process of bench calibration, for test safety, performance evaluation, fault diagnosis and test control (ensure that internal pressure is in design range, prevent deviation), the traditional monitoring mode is all using pressure sensor to be connected with engine by channel, then use bench computer to read out internal pressure value.

[0003] The existing pressure sensor range is too large (engine actual internal pressure is smaller, ≤2kPa), so that there is certain difference between measured value fluctuation and actual internal pressure, affect judgment, and sensor procurement cost is high and needs regular maintenance and goes out market fault handling carrying test is inconvenient. SUMMARY

[0004] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name. Such simplifications or omissions cannot be used to limit the scope of the utility model.

[0005] In view of the above existing engine internal pressure test problems, the utility model is proposed.

[0006] Therefore, the utility model aims to provide a kind of engine internal pressure testing device, which is to solve the problem of "the existing pressure sensor range is too large (engine actual internal pressure is smaller, ≤2kPa), so that there is certain difference between measured value fluctuation and actual internal pressure, affect judgment, and sensor procurement cost is high and needs regular maintenance and goes out market fault handling carrying test is inconvenient".

[0007] To solve the above technical problems, the utility model provides the following technical scheme:

[0008] A kind of engine internal pressure testing device, comprising:

[0009] Base, the base is equipped with U type glass tube, the U type glass tube is filled with measuring liquid, the measuring liquid is pure water, the U type glass tube one end is fixedly connected with transparent rubber tube, the transparent rubber tube is away from the oil filler cap of U type glass tube one end.

[0010] As a preferred scheme of the utility model, wherein: the U type glass tube is provided with a plurality of fixed supports, and the fixed supports are threadedly connected with screws between the base.

[0011] In a preferred embodiment of the engine internal pressure testing device of this utility model, the number of fixed supports is six, and the six fixed supports are symmetrically located at the top, middle and bottom of the U-shaped glass tube.

[0012] In a preferred embodiment of the engine internal pressure testing device of this utility model, a ruler is fixedly connected to the base, the ruler is located inside the U-shaped glass tube, and the scale unit of the ruler is mm.

[0013] In a preferred embodiment of the engine internal pressure testing device of this utility model, the base is L-shaped, and the bottom width of the base is greater than the top width.

[0014] The beneficial effects of this utility model are:

[0015] The U-shaped glass tube is filled with measuring fluid, with one end open to the atmosphere and the other end connected to the filler cap via a transparent tubing. The filler cap is mounted on the engine cylinder head cover. When the engine is running, its internal pressure is transmitted to the U-shaped glass tube through the filler cap, causing the liquid level to rise at the atmospheric end and fall at the end connected to the filler cap, creating a height difference in the liquid levels within the U-shaped glass tube. The pressure is then calculated using the formula P = ρgh, where P represents pressure (Pa) and ρ is the density of water (1.0 × 10⁻⁶). 3 kg / m 3 g is the acceleration due to gravity, with units of 10 m / s². 2 h represents the liquid level difference in meters (m). Calculations show that a 1cm height difference corresponds to a pressure of 0.1kPa. The engine internal pressure is then directly calculated based on this height difference. This measuring device exhibits good stability, has been bench-tested, and provides more accurate measurements. Furthermore, when used for market service, the U-shaped glass tube can be replaced with a transparent tubing, making it convenient to carry and measure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0017] Figure 1 This is a frontal overall structural diagram of an engine internal pressure testing device proposed in this utility model;

[0018] Figure 2 for Figure 1 Side view.

[0019] Figure: 1, U-shaped glass tube; 2, transparent rubber tube; 3, ruler; 4, fixed support; 5, screw; 6, base; 7, oil filler cap; 8, measuring liquid. DETAILED DESCRIPTION

[0020] In order to make the above-mentioned purposes, features and advantages of the present application more apparent and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0021] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can be practiced in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0022] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in this specification does not mean the same embodiment, nor is it an embodiment that is independent of or mutually exclusive of other embodiments.

[0023] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in order to facilitate the description, the cross-sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions of length, width and depth should be included in actual manufacture.

[0024] Reference Figures 1-2 The present application provides an engine internal pressure testing device, comprising:

[0025] The base 6 is provided with a U-shaped glass tube 1, the U-shaped glass tube 1 is filled with measuring liquid 8, the measuring liquid 8 is pure water, one end of the U-shaped glass tube 1 is fixedly connected with a transparent rubber tube 2, and the transparent rubber tube 2 is provided with an oil filler cap 7 away from one end of the U-shaped glass tube 1.

[0026] Among them, the U-shaped glass tube 1 is provided with a plurality of fixed supports 4, the fixed supports 4 and the base 6 are threadedly connected with screws 5, the U-shaped glass tube 1 is fixedly installed on the base 6 through the screws 5, and the stability of the U-shaped glass tube 1 is ensured while it can be disassembled.

[0027] Further, the number of fixed supports 4 is six, and the six fixed supports 4 are respectively and symmetrically located at three upper, middle and lower positions of the U-shaped glass tube 1, and the stability of the U-shaped glass tube 1 is improved by the setting of the six fixed supports 4.

[0028] Further, the ruler 3 is fixedly connected to the base 6, the ruler 3 is located inside the U-shaped glass tube 1, the unit of the scale of the ruler 3 is mm, and the user can intuitively observe the liquid level difference on both sides of the U-shaped glass tube 1 through the setting of the ruler 3, so that the user can use conveniently.

[0029] Further, the base 6 is L-shaped, the width of the bottom of the base 6 is greater than the width of the top, and the device can be placed stably through the design of being narrow at the top and wide at the bottom, and the stability is improved.

[0030] During use, the measuring liquid 8 is injected into the U-shaped glass tube 1, one end is communicated with the atmosphere, and the other end is connected with the oil filler cap 7 through the transparent rubber tube 2, wherein the oil filler cap 7 is installed on the engine cylinder head cover, when the engine runs, the internal pressure is transmitted to the U-shaped glass tube 1 through the oil filler cap 7 on the cylinder head cover, the liquid level on the atmosphere communication end of the U-shaped glass tube 1 rises, and the liquid level on the oil filler cap 7 connection end drops, so that there is a height difference between the liquid levels in the U-shaped glass tube 1, then the pressure formula P = ρgh is used for calculation, P represents the pressure, the unit is Pa, ρ is the density of water, the unit is 1.0 × 10 3 kg / m 3 ; g is the acceleration of gravity, the unit is 10 m / s 2 ; h is the height difference of the liquid level, the unit is m, and it is calculated that the pressure corresponding to 1cm of the height difference is 0.1kPa, and finally the internal pressure of the engine is directly obtained according to the height difference. The measuring device has good stability and has been verified on the test bench, and when the measuring device is used in the market, the U-shaped glass tube 1 can be cancelled and the transparent rubber tube is directly used instead, so that the measuring device is convenient to carry and measure.

[0031] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, not to limit, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and all should be covered in the scope of the claims of the present application.

Claims

1. An engine internal pressure testing device characterized by: Include: Base (6), which is provided with a U-shaped glass tube (1), the U-shaped glass tube (1) is filled with measuring liquid (8), the measuring liquid (8) is pure water, one end of the U-shaped glass tube (1) is fixedly connected with a transparent rubber tube (2), the transparent rubber tube (2) is provided with an oil filler cap (7) away from one end of the U-shaped glass tube (1).

2. An engine in-cylinder pressure testing apparatus according to claim 1, characterized by: A plurality of fixed supports (4) are arranged on the U-shaped glass tube (1), and the fixed supports (4) are threadedly connected with the base (6) through screws (5).

3. An engine in-cylinder pressure testing apparatus according to claim 2, characterized by: The number of the fixed supports (4) is six, and the six fixed supports (4) are symmetrically located at three positions of upper, middle and lower of the U-shaped glass tube (1) respectively.

4. An engine in-cylinder pressure testing apparatus according to claim 3, characterized by: The base (6) is fixedly connected with a ruler (3), the ruler (3) is located inside the U-shaped glass tube (1), and the scale unit of the ruler (3) is mm.

5. An engine in-cylinder pressure testing apparatus according to claim 4, characterized by: The base (6) is L-shaped, and the width of the bottom of the base (6) is greater than the width of the top.

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