RU2724560C1 - Multi-section unit high-pressure fuel pump - Google Patents

Abstract

FIELD: engine building.SUBSTANCE: invention can be used in fuel supply systems of internal combustion engines (ICE). Disclosed is a block multi-section high-pressure fuel pump for a piston multi-cylinder internal combustion engine with a number of cylinders m, where m≥2, and the same number of identical plungers, each of which is intended to perform the function of displacer and slide-type valve with phasewhere τ – engine strokeness; n – number of plunger, wherein plungers are made with possibility of operation in pairs in combinations of n-th with n+1-m, where n is plunger number, n=1…m-1, and m-th is with 1-m, and form a circular structure, wherein functions of slide-type valve and displacer are separated between plungers in each combination, but are combined in each plunger, operating in different combinations. Pump plungers are combined into k independent ring structures, withplungers in separate annular structure and identical sequence of connection of channels in all ring structures, at which each high-pressure channel connects above-plunger space of said sleeve with plunger sleeve opening hole, which operates with larger phase, and number of plungers in ring structure and number of ring structures in pump is determined from decomposition of number of cylinders of engine m into prime factors.EFFECT: technical result is improved reliability of 2- and 4-stroke multi-cylinder piston internal combustion engines with number of cylinders m, where m ≥2, and the same number of identical plunger pairs under condition of failure of some of these plunger pairs, as well as to reduce the plunger active stroke at the same cyclic feed.1 cl, 5 dwg

Description

"The technical field to which the invention relates."

The invention relates to engine manufacturing, mainly transport multi-cylinder. It is advisable to use high-pressure diesel engines in fuel equipment operating for a long time in transient conditions.

"Prior art"

The closest analogue of the invention is the "Method of organizing the operation of the high-pressure fuel pump and block multi-section high-pressure fuel pump for its implementation" according to Russian Patent No. 2695162 from 07.22.19.19.

"Disclosure of inventions"

The technical result of the invention is to increase the reliability of multi-cylinder 2- and 4-stroke piston multi-cylinder internal combustion engines with the number of cylinders m, where m≥2, and the same number of identical plunger pairs, provided that some of these plunger pairs fail, as well as to reduce the active plunger stroke at the same cycle feed.

где τ - тактность двигателя; n - номер плунжера, причем плунжеры выполнены с возможностью работы последовательно попарно в сочетаниях n-ый с n+1-ым, где n - номер плунжера, n=1…m-1, а m-й - с 1-м, и образуют кольцевую структуру, при этом функции золотника и вытеснителя разделены между плунжерами в каждом сочетании, но совмещены в каждом плунжере, работающем в разных сочетаниях, при этом плунжеры насоса объединены в к независимых кольцевых структур, с

плунжеров в отдельной кольцевой структуре и одинаковой последовательностью соединения каналов во всех кольцевых структурах, при которой каждый канал высокого давления соединяет надплунжерное пространство данной гильзы с отсечным отверстием гильзы плунжера, работающего с большей фазой, а число плунжеров в кольцевой структуре и число кольцевых структур в насосе определено из разложения числа цилиндров двигателя m на простые множители.To achieve a technical result, a multi-section high-pressure multi-cylinder fuel pump is proposed for a piston multi-cylinder internal combustion engine with the number of cylinders m, where m≥2, and the same number of identical plungers, each of which is designed to perform the function of a displacer and a spool with a phase

where τ is the engine cycle; n is the number of the plunger, and the plungers are configured to work sequentially in pairs in combinations n-th with n + 1-th, where n is the number of the plunger, n = 1 ... m-1, and the m-th - with the 1st, and form a ring structure, while the functions of the spool and displacer are divided between the plungers in each combination, but combined in each plunger operating in different combinations, while the pump plungers are combined into independent ring structures, with

plungers in a separate ring structure and the same sequence of connection of channels in all ring structures, in which each high-pressure channel connects the plunger space of this sleeve with the shut-off hole of the plunger sleeve, which works with a larger phase, and the number of plungers in the ring structure and the number of ring structures in the pump is determined from the decomposition of the number of engine cylinders m into prime factors.

"Brief Description of the Drawings"

In FIG. 1 for clarity, shows a diagram of a plunger pair. There is 1 shut-off fitting for the sleeve; 2 - discharge fitting.

In FIG. 2 shows a diagram of the formation of an annular structure of two plunger pairs.

In FIG. 3 shows a diagram of the formation of a ring structure of three plunger pairs.

In FIG. 4 shows possible combinations of ring structures for a 6-cylinder engine.

In FIG. 5 shows possible combinations of ring structures for an 8-cylinder engine.

"Implementation of the invention"

With reference to FIG. 2 plunger pair 3 is connected to plunger pair 4 by two high pressure pipelines. In this case, the shut-off fittings of the bushings 1 are connected to the corresponding discharge fittings 2. The high-pressure lines are connected to the nozzles 5 of the respective cylinders.

With reference to FIG. 3 parameter z - the number of plunger pairs in the ring structure.

Then: τ is the engine cycle; n is the number of the plunger pair; m is the number of engine cylinders; z is the number of plunger pairs in the ring structure of the injection pump, k is the number of ring structures.

The value of "m" is decomposed into prime factors with the condition of choosing the minimum "z". Additional conditions include the symmetry of the engine, the design of the injection pump, etc. For example, it is desirable that the value of "z" give central symmetry (so that "z" is not a prime), z = 6 is better than z = 7.

If the number of cylinders "m" is a prime, then there will be one ring structure (k = 1) and in it the number of plunger pairs is equal to the number of cylinders (z = m). Moreover, the greater the "t", the greater the possible options for organizing ring structures.

By the formula (1) for a 2-stroke 4-cylinder engine τ = 2; τ = 4 we get:

This engine has the parameters of ring structures: m = 4; z is 2; k = 2.

For a 6 cylinder engine, possible combinations of ring structures are shown in FIG. 4. Accordingly (a) - m = 6, z = 2, k = 3; (b) m = 6, z = 3, k = 2; (c) - m = 6, z = 6, k = 1.

For an 8-cylinder engine, the ring structure is shown in FIG. 5, on the left side of a, with parameters: m = 8, z = 2, k = 4. If the plunger pair 6 fails (see Fig. 5, the right part b), the pairs 7 and 8 included in the ring structure and connected with the pair 6 are disconnected. In turn, the pair 9 continues to operate normally. Thus, the 8-cylinder engine in the event of failure of one plunger pair continues to work on 5 cylinders.

Consider the possible combinations of the organization of the ring work of the high-pressure fuel pump of the diesel engine 42CHNSP 16/17. The number of cylinders m = 42 is decomposed into prime factors 2, 3 and 7. Possible combinations of the number of plunger pairs and the number of ring structures (Z × K):

The analysis shows the inappropriateness of the organization of ring structures at Z> 10.

Claims (1)

Block multi-section high-pressure fuel pump for a reciprocating multi-cylinder internal combustion engine with the number of cylinders m, where m≥2, and the same number of identical plungers, each of which is designed to perform the function of a displacer and a spool with a phase

where τ is the engine cycle; n is the number of the plunger, and the plungers are configured to work sequentially in pairs in combinations of the n-th with n + 1-m, where n is the number of the plunger, n = 1 ... m-1, and the m-th is from the 1st, and form a ring structure, while the functions of the spool and displacer are divided between the plungers in each combination, but combined in each plunger operating in different combinations, characterized in that the pump plungers are combined in k independent ring structures with

plungers in a separate ring structure and the same sequence of connection of channels in all ring structures, in which each high-pressure channel connects the plunger space of this sleeve with the shut-off hole of the plunger sleeve, which works with a larger phase, and the number of plungers in the ring structure and the number of ring structures in the pump is determined from the decomposition of the number of engine cylinders m into prime factors.

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