CN2160896Y - Detector for cylinder pressure - Google Patents

Abstract

The utility model relates to a detector for measuring compression pressure in the cylinder of an internal combustion engine or a compressor and the explosion pressure of the internal combustion engine. The detector is suitable for being used the site of maintenance. The detector is characterized in that a check valve and a one-way valve sealed by an O-shaped ring and a conical surface; a pressure meter is used for directly displaying the maximum pressure value. The utility model has the advantages of good sealing performance, reliable work, stable reading, and convenient manufacture and use. The utility model can also be used for measuring the maximum value in the pressure fluctuation of various hydraulic and pneumatic machines.

Description

Detector for cylinder pressure

The utility model relates to a kind of cylinder pressure pick-up unit, particularly a kind ofly is used to measure the compression pressure of internal combustion engine or compressor and the pick-up unit of internal combustion engine explosion pressure.This device also can be used for the measurement of maximum pressure in various hydraulic machineries, the pneumatic machinery surge pressure.

The measuring method of internal combustion engine, compresser cylinder pressure mainly contains two pointer pressures in the prior art, and ordinarily manometer adds the joint of be with non-return valve, and the electronics of gas electric indicator and pressure transducer and electron oscillograph composition shows that merit device etc. is several.(referring to " diesel oil measuring technology (revised edition) ", National Defense Industry Press's version in 1984, Yang Guangsheng chief editor)

Wherein, two pointer pressures have two root pointers, the tested force value of reflection, and the maximal value when another root reflects tested pressure surge, the maximum pressure precision that this special tensimeter records is not high, has not now organized production, therefore is difficult to buy.Gas electric indicator need use inconvenient with being contained in pressurized air in the high-pressure cylinder as source of the gas.The electronics of being made up of pressure transducer and oscillograph shows that the merit device needs high-precision complete electronic device, and the instrument price is higher, is suitable for the laboratory study test, and the force value that records needs can not directly obtain pressure reading easily through demarcating.Though the measuring technology that adds the joint of being with non-return valve with ordinarily manometer in the prior art can be used in maintenance sites, according to the analysis of above-mentioned reference, because the inevitable small leak of non-return valve makes the tensimeter indicated value be lower than true value.Especially when the inner pressure of air cylinder escalating rate was big, error was just bigger.

The purpose of this utility model provides a kind of improved cylinder pressure pick-up unit.It can be used to measure the compression pressure of internal combustion engine or compressor easily in the use maintenance sites, also can be used for measuring the explosion pressure of internal combustion engine.

The technical solution of the utility model is to adopt a common tensimeter to show tested maximum pressure value.To be contained in the joint of non-return valve on the cylinder head of tested machinery during detection, tested gas (or liquid) flows to tensimeter by non-return valve and connecting pipe under pressure.A retaining valve is arranged between tensimeter and connecting pipe.This retaining valve can adopt the cone valve structure that a rubber o-ring is housed, so sealing is very reliable.When the pressure generating period fluctuation of detected fluid, tensimeter promptly shows maximum pressure after several circulations.Because the double action of retaining valve and non-return valve, after being descended by measuring pressure, gauge hand still can stably be indicated maximum pressure.This retaining valve can be contained on the pressure gauge stand.For the ease of using, the utility model can also be equipped with the atmospheric valve of a bypass, when atmospheric valve is opened, and pressure fluid and big gas phase, manometric total indicator reading returns zero.Atmospheric valve should seal reliably, and atmospheric valve also can adopt the structure similar to retaining valve, also can adopt the cone valve structure that a rubber o-ring is housed.

The utility model is compared with prior art, and the advantage that is had is reliablely and stablely to detect the maximum pressure of inner pressure of air cylinder fluctuation.Adopt common tensimeter directly big force value, use simply, convenient, be adapted at using maintenance sites to use.Since do not adopt the high-precision electronic components and parts, so cost is low, good reliability, vibration resistance.The utility model adopts non-return valve and retaining valve double seal, so gauge hand is stable, does not shake, the measuring accuracy height, and error is little.

Accompanying drawing is an embodiment of the present utility model.

Structure and use below in conjunction with description of drawings embodiment.

Tensimeter in the accompanying drawing (1) is a common pointer pressure, and it is contained on the pressure gauge stand (10).The joint (3) that has a non-return valve is contained in internal combustion engine or cylinder of compressor covers, and this non-return valve adopts steel ball and spring sealed.Gaseous tension in the cylinder is pushed non-return valve open after raising, and flows to the pressure gauge stand through connecting pipe (2).The diameter and the length of connecting pipe (2) can change or extend as required.Retaining valve (4) is housed on the pressure gauge stand.This retaining valve adopts the cone valve (5) that a rubber o-ring (6) is housed, and a spring that rigidity is less is housed in the cup-shaped hole of cone valve.The cone valve top is 60 ° of cone angles, matches with the taper hole of valve seat.O shape circle (6) is contained in the groove of cone valve (5), and the outside surface of O shape circle suitably protrudes the conical surface, and forms band with taper hole, therefore needn't be too high to the manufacturing accuracy requirement of cone valve (5) and taper hole.When this device is used to detect the internal combustion engine explosion pressure, because gas temperature is very high, should be with heat resistant rubber or the good elastoplast manufacturing of heat resistance.The atmospheric valve (7) of a bypass also is housed on the pressure gauge stand (10).Atmospheric valve is opened when pressing the button (11), and gases at high pressure communicate with atmosphere through atmospheric valve, and the reading of tensimeter (1) is got back to zero-bit.This atmospheric valve adopts and has the cone valve (8) of going back groove, and the O-ring seals (9) that resilient material is made is housed in the annular groove.During detected state, cone valve (8) is in the closed position under the acting in conjunction of gaseous tension and spring force.Owing to adopted O shape circle (9), so sealing is reliable, and manufacture difficulty is little, and cost is low.

Claims (6)

1, the cylinder pressure pick-up unit formed such as a kind of joint [3] by tensimeter [1], connecting pipe [2] and band non-return valve is characterized in that between tensimeter [1] and connecting pipe [2] retaining valve [4] being arranged.

2, cylinder pressure pick-up unit according to claim 1 is characterized in that retaining valve (4) wherein is a cone valve (5).

3, cylinder pressure pick-up unit according to claim 2 is characterized in that on the cone valve (5) of retaining valve (4) wherein an O shape circle (6) being housed.

4, cylinder pressure pick-up unit according to claim 3 is characterized in that O shape circle (6) wherein adopts rubber or elastoplast manufacturing.

5, cylinder pressure pick-up unit according to claim 1 is characterized in that being equipped with one and is used to make pressure gauge reading to return zero atmospheric valve (7).

6, cylinder pressure pick-up unit according to claim 5 is characterized in that the O shape circle (9) that atmospheric valve (7) wherein adopts cone valve (8) and makes with rubber ring or elastoplast.

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