Pressure reducer and engine air inlet cooling system

Abstract

The invention provides a pressure reducer and an engine air inlet cooling system, and relates to the technical field of engines. The heat exchange body is integrated on the pressure reducer body, on one hand, integration of the pressure reducer and an air inlet system is achieved, and overall arrangement of an engine is facilitated; on the other hand, by means of the principle that high-pressure fuel gas in the pressure reducer body is subjected to pressure reduction and heat absorption, air in the heat exchange cavity can exchange heat with the pressure reducer body, so that air output to the engine system from the air outlet is effectively cooled, the content of oxygen input into the engine system in unit time is higher, and the service life of the engine system is prolonged. And the power performance, the economic performance, the emission performance and the air inlet mass flow of an engine system are improved.

Description

Technical Field

[0001] This invention relates to the field of engine technology, and more specifically, to a pressure reducer and an engine intake air cooling system. Background Technology

[0002] In relevant technical solutions, the engine achieves functional integration with the intake system through a pressure reducer. As a core component of the gas supply system, the pressure reducer is responsible for reducing the high-pressure gas in the gas cylinder to the working pressure required by the injection rail; its performance directly affects the stable operation of the entire gas system. On the other hand, the intake system not only supplies the engine with the air needed for combustion but also increases air density through compression, thereby allowing more fuel to participate in combustion and improving engine power output.

[0003] However, the intake system causes the air temperature to drop during compression, and during the operation of the pressure regulator, the gas inside the regulator expands and absorbs a large amount of heat when changing from high pressure to low pressure, causing the pressure regulator to cool down rapidly. Based on this characteristic, how to utilize the pressure regulator to cool the air in the intake system and integrate the pressure regulator with the intake system is an urgent problem to be solved. Summary of the Invention

[0004] The present invention aims to provide a pressure reducer and an engine intake air cooling system, which can cool the air in the intake system through the pressure reducer, allowing lower temperature air to enter the engine, thereby increasing the mass flow rate of the engine intake air and improving the engine's power performance, economic performance, and emission performance.

[0005] The embodiments of the present invention can be implemented as follows: In a first aspect, the present invention provides a pressure reducer, comprising: The pressure regulator body has a gas inlet and a gas outlet connected together; The heat exchange body has a heat exchange cavity and an air inlet and an air outlet communicating with the heat exchange cavity. The pressure reducer body is connected to the heat exchange body and passes through the heat exchange cavity. The air inlet is used to communicate with the intake system, and the air outlet is used to communicate with the engine system.

[0006] In an optional embodiment, the heat exchange body includes a heat exchange shell and a plurality of heat exchange fins. The heat exchange shell is sealed to the pressure reducer body and forms the heat exchange cavity with the outer wall of the pressure reducer body. The heat exchange shell is provided with the air inlet and the air outlet. Multiple heat exchange fins are spaced apart and arranged in the heat exchange cavity, and the multiple heat exchange fins are connected to the heat exchange shell and / or the pressure reducer body.

[0007] In an optional embodiment, the pressure reducer body includes a primary body for performing primary pressure reduction on the gas. The primary body extends through the heat exchange chamber and is located within the heat exchange chamber. The primary body is provided with a primary pressure reduction chamber, which is connected to the gas inlet and the gas outlet respectively.

[0008] In an optional embodiment, the primary body includes a primary core, which is provided with a gas inlet, a gas flow channel and a water flow channel. The gas flow channel is connected to the gas inlet and the gas outlet respectively, and the water flow channel is located close to the gas flow channel. The water flow channel is used to heat the pressure regulator body. The primary pressure reducing chamber is connected to the gas flow channel and the gas outlet, respectively.

[0009] In an optional embodiment, the primary body includes a primary cylinder, a primary piston, and a primary elastic element, with the primary core sleeved inside the primary cylinder; The primary cylinder has a primary through cavity, the primary core is fixedly disposed at one end of the primary through cavity, and the primary piston is slidably disposed at the other end of the primary through cavity; the primary elastic element is sleeved on the primary piston, one end of the primary elastic element is connected to the primary piston, and the other end is connected to the primary cylinder; The first-stage piston is provided with a first-stage opening and a first-stage pressure reducing chamber connected together, and the first-stage pressure reducing chamber is connected to the gas flow channel through the first-stage opening.

[0010] In an optional embodiment, the gas flow channel includes a first gas passage and at least two second gas passages. One end of the first gas passage is connected to the gas inlet, and the other end is connected to at least two second gas passages. The at least two second gas passages are spaced apart and connected to the primary pressure reducing chamber. The primary core is also provided with a water inlet and a water outlet. The water channel includes a first water channel and a second water channel that are connected and spaced apart. The first water channel is connected to the water inlet, and the second water channel is connected to the water outlet. At least two of the second air passages are offset from the first water passage and the second water passage.

[0011] In an optional embodiment, the pressure reducer body further includes a secondary body for performing secondary pressure reduction on the gas. The secondary body is connected to the primary body. Part of the heat exchange body is connected to the primary body, and another part of the heat exchange body is connected to the secondary body. The inner wall of the heat exchange body and the outer walls of the primary body and the secondary body form the heat exchange cavity. The secondary body is provided with a secondary pressure reducing chamber, which is connected to the primary pressure reducing chamber and the gas outlet.

[0012] In an optional embodiment, the secondary body includes a secondary cylinder, a secondary core, a secondary cover, a secondary piston, and a secondary elastic element. The secondary cylinder is provided with a secondary pressure-reducing chamber and a connecting part. The connecting part is provided with a secondary opening and is located on the side of the secondary pressure-reducing chamber close to the primary pressure-reducing chamber. The secondary cover is connected to the secondary cylinder to form the secondary pressure-reducing chamber, and the gas outlet is provided on the secondary cover. The secondary core is located within the secondary pressure reducing chamber and extends through the secondary opening. One end of the secondary core extends through the gas outlet. The secondary core is slidably disposed relative to the connecting portion and is used to open or close the secondary opening under pressure. The secondary core is provided with the internal gas passage, and the secondary pressure reducing chamber is connected to the gas outlet through the internal gas passage. The secondary piston is slidably disposed in the secondary pressure reducing chamber, and one end of the secondary piston is limitedly connected to the secondary cylinder and the other end is limitedly connected to the secondary cover. The secondary piston is sealed and sleeved on the secondary core and limitedly connected to the secondary core. The secondary elastic element is sleeved on the secondary core, with one end of the secondary elastic element abutting against the secondary piston and the other end abutting against the inner wall of the secondary cover.

[0013] In an optional embodiment, the secondary core includes a rod and a sealing part, the rod passing through the secondary opening, and the sealing part located on the side close to the primary decompression chamber; The secondary opening has a first inclined surface facing the inner wall of the secondary cylinder on the side near the primary pressure reducing chamber, and the sealing part has a second inclined surface on the side near the secondary opening. The first inclined surface and the second inclined surface are fitted together and sealed together. The sealing part also has a groove on the side near the primary pressure reducing chamber.

[0014] In a second aspect, the present invention provides an engine intake cooling system, comprising: a pressure reducer as described in any of the foregoing embodiments; An engine system having a combustion chamber connected to both a gas outlet and an air outlet; An air intake system, wherein the air intake system is connected to the air inlet; A gas storage system, which is connected to the gas inlet.

[0015] The beneficial effects of the pressure reducer and engine intake cooling system provided in the embodiments of the present invention include: By integrating a heat exchanger onto the pressure reducer body, on the one hand, the pressure reducer and the intake system are integrated, which is beneficial to the overall engine layout; on the other hand, by utilizing the principle of high-pressure gas pressure reduction and heat absorption within the pressure reducer body, the air in the heat exchange chamber can exchange heat with the pressure reducer body, so that the air output from the air outlet to the engine system is effectively cooled, resulting in a higher oxygen content entering the engine system per unit time, thereby improving the engine system's power performance, economic performance, emission performance, and intake mass flow rate. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the pressure reducer provided in this embodiment from a first-view perspective; Figure 2 This is a schematic diagram of the structure of the primary core provided in this embodiment from a first-view perspective; Figure 3 This is a schematic diagram of the pressure reducer provided in this embodiment from a second perspective; Figure 4 This is a schematic diagram of the primary core structure provided in this embodiment from a second perspective; Figure 5 This is a schematic diagram of the solenoid valve switch assembly provided in this embodiment from a second perspective. Figure 6 This is a schematic diagram of the engine intake cooling system provided in this embodiment.

[0018] Reference numerals: 010-Engine intake cooling system; 011-Pressure reducer; 012-Engine system; 013-Intake system; 014-Air storage system; 015-Air rail; 016-Intake manifold; 017-Antifreeze reservoir system; 100 - Pressure regulator body; 101 - Gas inlet; 102 - Gas outlet; 200-First-stage body; 210-First-stage core; 211-Gas flow channel; 2111-First gas path; 2112-Second gas path; 212-Water path; 2121-First water path; 2122-Second water path; 213-Water inlet; 214-Water outlet; 215-Antifreeze connector; 220-First-stage cylinder; 221-First-stage cavity; 230-First-stage piston; 231-First-stage pressure reducing chamber; 232-First-stage opening; 240-First-stage elastic element; 300-Secondary body; 310-Secondary cylinder; 311-Secondary pressure reducing chamber; 312-Connecting part; 313-Secondary opening; 320-Secondary core; 321-Internal air passage; 322-Rod; 323-Sealing part; 324-Rod adjusting nut; 330-Secondary cover; 340-Secondary piston; 350-Secondary elastic element; 360-First stage retaining ring; 370-Air outlet connector; 380-Spring base; 390-Base adjusting nut; 400 - Heat exchange body; 410 - Heat exchange shell; 411 - Heat exchange cavity; 412 - Air inlet; 413 - Air outlet; 420 - Heat exchange fins; 500 - Solenoid valve switch assembly; 510 - Housing; 520 - Switch core; 530 - Switch elastic element; 540 - High-pressure air pipe connector. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this invention is usually placed, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0023] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0024] It should be noted that, where there is no conflict, the features in the embodiments of the present invention can be combined with each other.

[0025] The following detailed description of the overall structure, working principle, and technical effects of the pressure reducer and engine intake cooling system provided by the present invention, through embodiments and in conjunction with the accompanying drawings, is a detailed account of these embodiments.

[0026] Please refer to Figure 1 and Figure 6 The pressure reducer 011 and engine intake air cooling system 010 provided by the present invention are applied to the engine of CNG (compressed natural gas) vehicles. They can cool the air in the intake system 013 through the pressure reducer 011, so that lower temperature air enters the engine, thereby increasing the mass flow rate of the engine intake air and improving the engine's power performance, economic performance and emission performance.

[0027] Firstly, please refer to Figure 1 The present invention proposes a pressure reducer 011, comprising: The pressure regulator body 100 is provided with a gas inlet 101 and a gas outlet 102 that are connected. The heat exchange body 400 is provided with a heat exchange cavity 411 and an air inlet 412 and an air outlet 413 connected to the heat exchange cavity 411. The pressure reducer body 100 is connected to the heat exchange body 400 and passes through the heat exchange cavity 411. The air inlet 412 is used to connect to the intake system 013, and the air outlet 413 is used to connect to the engine system 012.

[0028] Understandably, the gas storage system 014 inputs fuel gas from the gas inlet 101 into the pressure reducer body 100, where the gas pressure is reduced. The reduced-pressure gas is then output from the gas outlet 102 to the engine system 012 for combustion. Simultaneously, the intake system 013 inputs air into the heat exchange chamber 411 for cooling. The cooled air is then output from the air outlet 413 to the engine system 012 to combust with the fuel gas. Specifically, when the fuel gas changes from high pressure to low pressure within the pressure reducer body 100, it expands and absorbs a large amount of heat, causing the pressure reducer body 100 to cool rapidly. At this point, outputting the air from the intake system 013 to the heat exchange chamber 411 allows the pressure reducer body 100 to cool the air in the intake system 013, thereby effectively reducing the intake temperature of the engine system 012.

[0029] Therefore, by integrating a heat exchanger body 400 onto the pressure reducer body 100, this application achieves the integration of the pressure reducer 011 and the intake system 013, which is beneficial to the overall layout of the engine. On the other hand, by utilizing the principle of high-pressure gas pressure reduction and heat absorption in the pressure reducer body 100, the air in the heat exchange chamber 411 can exchange heat with the pressure reducer body 100, so that the air output from the air outlet 413 to the engine system 012 is effectively cooled, resulting in a higher oxygen content in the engine system 012 per unit time, thereby improving the power performance, economic performance, emission performance, and intake mass flow rate of the engine system 012.

[0030] In an optional embodiment, if the pressure reducer 011 is used for a turbocharged engine, then the intake system 013 delivers compressed air; of course, the pressure reducer 011 can also be used for a naturally aspirated engine, then the intake system 013 delivers atmospheric pressure air.

[0031] In this embodiment, the pressure reducer 011 includes a heat exchange body 400.

[0032] The heat exchanger body 400 is used to cool the air in the intake system 013 through the pressure reducer body 100.

[0033] Specifically, the heat exchange body 400 is provided with a heat exchange cavity 411 and an air inlet 412 and an air outlet 413 connected to the heat exchange cavity 411. The pressure reducer body 100 is connected to the heat exchange body 400 and passes through the heat exchange cavity 411. The air inlet 412 is used to connect to the intake system 013, and the air outlet 413 is used to connect to the engine system 012.

[0034] In this embodiment, please refer to Figure 1 and Figure 3 The heat exchange body 400 includes a heat exchange shell 410 and a plurality of heat exchange fins 420. The heat exchange shell 410 is sealed to the pressure reducer body 100 and forms a heat exchange cavity 411 with the outer wall of the pressure reducer body 100. The heat exchange shell 410 is provided with an air inlet 412 and an air outlet 413.

[0035] The air inlet 412 and the air outlet 413 are located at opposite ends of the pressure reducer body 100, thus forming a longer, more continuous, and highly directional flow channel, which can ensure the heat exchange rate between the air and the pressure reducer body 100.

[0036] The heat exchange shell 410 is sealed to the primary cylinder 220 and the secondary cylinder 310 at its opposite ends, respectively. That is, the heat exchange shell 410 is sealed to the primary cylinder 220 and the secondary cylinder 310 by heat exchange sealing rings.

[0037] Specifically, please refer to Figure 1 and Figure 3 Multiple heat exchange fins 420 are spaced apart and arranged in the heat exchange chamber 411. The multiple heat exchange fins 420 are connected to the primary cylinder 220 of the pressure reducer body 100. The primary cylinder 220 and the multiple heat exchange fins 420 can be an integral structure. The heat exchange fins 420 are annular fins that extend along the outer wall of the primary cylinder 220 toward the heat exchange shell 410.

[0038] Optionally, multiple heat exchange fins 420 can also be connected to the inner wall of the heat exchange shell 410. Of course, multiple heat exchange fins 420 can also be connected to the inner wall of the heat exchange shell 410 and the primary cylinder 220 of the pressure reducer body 100 at the same time.

[0039] It is understandable that by providing multiple heat exchange fins 420 within the heat exchange cavity 411, the effective contact surface area between the air within the heat exchange cavity 411 and the pressure reducer body 100 can be significantly increased, greatly enhancing the heat exchange capacity between the air and the pressure reducer body 100. Furthermore, the heat exchange fins 420 are connected to the pressure reducer body 100, enabling faster heat conduction to the pressure reducer body 100.

[0040] In this embodiment, please refer to Figure 1 and Figure 3 The gas inlet 101 of the pressure reducer body 100 is connected to a solenoid valve switch assembly 500. At the end of the solenoid valve switch assembly 500 away from the gas inlet 101, a high-pressure gas pipe connector 540 is sealed and connected to the gas storage system 014 through a connector sealing ring. The high-pressure gas pipe connector 540 is connected to the gas storage system 014 through a gas pipe to supply gas to the pressure reducer body 100.

[0041] In this embodiment, please refer to Figure 5 The solenoid valve switch assembly 500 is communicatively connected to the ECU control system. The ECU control system can control the opening and closing of the solenoid valve switch assembly 500, thereby controlling the flow of gas into the pressure reducer body 100. That is, when the engine system 012 requires or uses a gas source, the solenoid valve switch assembly 500 can connect or disconnect the gas source of the gas storage system 014.

[0042] Optionally, the solenoid valve switch assembly 500 includes a housing 510, a switch core 520, and a switch elastic element 530. It may have an internal cavity. One end of the housing 510 is connected to the gas inlet 101, and the other end is connected to the high-pressure gas pipe connector 540. The switch core 520 is disposed in the cavity, and the switch elastic element 530 is sleeved on the switch core 520. One end of the switch elastic element 530 abuts against the switch core 520, and the other end abuts against the end of the high-pressure gas pipe connector 540.

[0043] In this embodiment, the pressure reducer 011 includes a pressure reducer body 100.

[0044] The pressure reducer body 100 is used to perform multi-stage pressure reduction on the gas.

[0045] In this embodiment, please refer to Figure 1 and Figure 3 The pressure reducer body 100 includes a primary body 200. The primary body 200 is provided with a primary pressure reducing chamber 231, which is connected to the gas inlet 101 and the gas outlet 102 respectively.

[0046] Understandably, the primary unit 200 performs a first-stage pressure reduction on the high-pressure gas, reducing it to medium-pressure gas. During this first-stage pressure reduction, the gas undergoes dramatic adiabatic expansion due to the significant pressure drop, causing a sharp decrease in the temperature of the primary unit 200. Therefore, the heat exchanger unit is positioned relative to the primary unit 200 to maximize the utilization of the temperature drop in the primary unit 200, enabling it to cool the air within the heat exchange chamber 411.

[0047] Optionally, the primary body 200 may penetrate the heat exchange cavity 411 and be located within the heat exchange cavity 411; of course, the primary body 200 may also not be located within the heat exchange cavity 411, that is, the primary body 200 may penetrate the heat exchange cavity 411 and extend out of the heat exchange cavity 411.

[0048] In this embodiment, please refer to Figure 1 and Figure 3 The primary body 200 includes a primary core 210, which is sleeved inside the primary body 200. Part of the primary core 210 is located inside the heat exchange chamber 411. The primary core 210 is provided with a gas inlet 101, a gas flow channel 211, and a water flow channel 212. The gas flow channel 211 is connected to the gas inlet 101 and the gas outlet 102, respectively. The water flow channel 212 is located close to the gas flow channel 211 and is used to heat the pressure reducer body 100. The primary pressure reducing chamber 231 is connected to the gas flow channel 211 and the gas outlet 102, respectively.

[0049] In this embodiment, please refer to Figure 3 and Figure 4 The gas flow channel 211 includes a first gas passage 2111 and at least two second gas passages 2112. One end of the first gas passage 2111 is connected to the gas inlet 101, and the other end is connected to at least two second gas passages 2112. The at least two second gas passages 2112 are spaced apart and connected to the first-stage pressure reducing chamber 231.

[0050] Optionally, the number of second air passages 2112 can be two, three, etc. When there are two second air passages 2112, the two spaced second air passages 2112 are located on both sides of the first-stage opening 232 of the first-stage cylinder 220, which can smoothly push the first-stage cylinder 220 to move.

[0051] In this embodiment, please refer to Figure 1 and Figure 2 The primary core 210 is also provided with a water channel 212, a water inlet 213, and a water outlet 214. The water channel 212 includes a first water channel 2121 and a second water channel 2122 that are connected and spaced apart. The first water channel 2121 is connected to the water inlet 213, and the second water channel 2122 is connected to the water outlet 214.

[0052] The water channel 212 is used to introduce heated antifreeze. The circulating antifreeze heats the pressure reducer body 100, which can effectively prevent ice blockage and ensure the normal operation of the pressure reducer 011 and the safety of the entire system. At the same time, by controlling the flow rate of the heated antifreeze, the cooling effect of the engine system 012 when different intake air requirements are met can be indirectly controlled.

[0053] Specifically, please refer to Figure 6 Both the water outlet 214 and the water inlet 213 are connected to antifreeze connectors 215. The two antifreeze connectors 215 are connected to the antifreeze storage system 017 through pipelines to realize the circulation of antifreeze in the water channel 212.

[0054] In this embodiment, please refer to Figure 2 and Figure 4 The water passage 212 and the gas passage 211 are staggered, meaning they are not connected and do not interfere with each other's operation. Optionally, at least two second gas passages 2112 are staggered from the first water passage 2121 and the second water passage 2122. In this configuration, both the water passage 212 and the gas passage 211 are separate passages, and the first water passage 2121 and the second water passage 2122 are staggered from the two second gas passages 2112 to prevent them from connecting.

[0055] In some embodiments, a heating device capable of electric heating can also be provided inside the primary core 210. The heating device includes heating wires, etc. The heating wires are arranged around the primary core 210 to achieve uniform heating of the primary core 210 and to effectively prevent ice blockage.

[0056] In this embodiment, please refer to Figure 1 and Figure 3The primary body 200 also includes a primary cylinder 220, a primary piston 230, and a primary elastic element 240. The primary cylinder 220 is provided with a primary through cavity 221. The primary core 210 is fixedly disposed at one end of the primary through cavity 221, and the primary piston 230 is slidably disposed at the other end of the primary through cavity 221. The primary elastic element 240 is sleeved on the primary piston 230. One end of the primary elastic element 240 is connected to the primary piston 230, and the other end is connected to the primary cylinder 220. The primary piston 230 is provided with a primary opening 232 and a primary pressure reducing chamber 231 that are connected to each other. The primary pressure reducing chamber 231 is connected to the gas flow channel 211 through the primary opening 232.

[0057] Understandably, in the absence of gas flow, under the elastic force of the first-stage elastic element 240, the end face of the first-stage piston 230 with the first-stage opening 232 does not abut against the end face of the first-stage core 210, that is, the gas flow channel 211 is connected to the first-stage pressure reducing chamber 231.

[0058] In the ventilated state, the gas in the gas flow channel 211 is transported to the primary passage cavity 221 through the primary opening 232. Because the left side area of ​​the primary piston 230 is larger than the right side area, without considering the elastic force of the primary elastic element 240, the pressure on the left and right sides of the primary piston 230 is the same, and the primary piston 230 will move to the right. Considering the elastic force of the primary elastic element 240, when the pressure on the left and right sides of the primary piston 230 reaches a certain value, the primary piston 230 begins to move to the right. As the pressure continues to increase to a certain value, the primary piston 230 moves to the far right, so that the end face of the primary piston 230 with the primary opening 232 abuts against the end face of the primary core 210, thereby automatically shutting off the gas flow from the gas flow channel 211 through the primary passage cavity 221 and then through the primary opening 232 to the primary pressure reducing chamber 231. In the above description, left and right refer to... Figure 1 The left and right directions in the middle.

[0059] It is worth mentioning that when the high-pressure gas passes through the gas flow channel 211 and the first-stage opening 232, the narrow gas flow channel 211 and the first-stage opening 232 form a throttling channel. When the high-pressure gas flows through this point, the velocity increases sharply and the pressure drops sharply, thereby achieving the first-stage pressure reduction of the high-pressure gas.

[0060] The pressure drop occurs as follows: when the second gas passage 2112 and the first-stage piston 230 reach contact, the cross-sectional area suddenly increases. The area of ​​the second gas passage 2112 near the first-stage piston 230 (including the area of ​​the first-stage piston 230 near the second gas passage 2112) is the main rapid cooling section. The pressure reduction in the first stage is extremely large, mainly occurring after the second gas passage 2112 contacts the first-stage piston 230, at the moment the pressure-reducing first-stage piston 230 moves to the left. At this time, the second gas passage 2112 is at high pressure, and the first-stage pressure-reducing chamber 231 is at low pressure. The gas cools down as it changes from high pressure to low pressure.

[0061] Specifically, both ends of the first-stage piston 230 are sealed to the inner wall of the first-stage cylinder 220 via first-stage cups. The first-stage elastic element 240 is a spring.

[0062] In this embodiment, please refer to Figure 1 and Figure 3 The pressure reducer body 100 also includes a secondary body 300, which is used to perform secondary pressure reduction on the gas. The secondary body 300 is connected to the primary body 200. Part of the heat exchange body 400 is connected to the primary body 200, and another part of the heat exchange body 400 is connected to the secondary body 300. The inner wall of the heat exchange body 400 and the outer walls of the primary body 200 and the secondary body 300 form a heat exchange cavity 411. The secondary body 300 is provided with a secondary pressure reduction cavity 311, which is connected to the primary pressure reduction cavity 231 and the gas outlet 102.

[0063] Understandably, the first-stage body 200 performs a first-stage pressure reduction on the high-pressure gas, reducing it to medium-pressure gas; furthermore, the second-stage body 300 performs a second-stage pressure reduction on the medium-pressure gas, reducing it to low-pressure gas. During the second-stage pressure reduction process, the temperature drop of the medium-pressure gas is much smaller than that during the first-stage pressure reduction.

[0064] In this embodiment, please refer to Figure 1 and Figure 3 The secondary body 300 includes a secondary cylinder 310, a secondary core 320, a secondary cover 330, a secondary piston 340, and a secondary elastic element 350. The secondary cylinder 310 is provided with a secondary pressure reducing chamber 311 and a connecting part 312. The connecting part 312 is provided with a secondary opening 313 and is located on the side of the secondary pressure reducing chamber 311 close to the primary pressure reducing chamber 231. The secondary cover 330 is connected to the secondary cylinder 310 to form the secondary pressure reducing chamber 311. A gas outlet 102 is provided on the secondary cover 330.

[0065] The secondary cylinder 310 and the primary cylinder 220 are sealed together by a sealing ring, and the primary cylinder 220 and the secondary cylinder 310 are also provided with a primary retaining ring 360 to limit the movement of the primary piston 230.

[0066] Among them, the gas outlet 102 is connected to the gas outlet connector 370, and the rod 322 of the secondary core 320 passes through the gas outlet 102 and is connected to the gas outlet connector 370.

[0067] Specifically, the secondary core 320 is located inside the secondary pressure reducing chamber 311 and passes through the secondary opening 313. One end of the secondary core 320 passes through the gas outlet 102. The secondary core 320 is slidably arranged relative to the connecting part 312 and is used to open or close the secondary opening 313 under pressure. The secondary core 320 is provided with an internal gas passage 321, and the secondary pressure reducing chamber 311 is connected to the gas outlet 102 through the internal gas passage 321.

[0068] Specifically, the secondary piston 340 is slidably disposed in the secondary pressure reducing chamber 311, and one end of the secondary piston 340 is limitedly connected to the secondary cylinder 310, and the other end is limitedly connected to the secondary cover 330; wherein, an annular protrusion extends from the inner wall of the secondary cylinder 310, and the secondary piston 340 is limited and slidably disposed between the annular protrusion and the secondary cover 330.

[0069] Specifically, the secondary piston 340 is sealed onto the secondary core 320 and is limitedly connected to the secondary core 320. The inner wall of the secondary piston 340 is sealed to the secondary core 320 through a secondary seal, and the outer wall of the secondary piston is sealed to the secondary cylinder 310 through a secondary cup.

[0070] Specifically, the secondary elastic element 350 is sleeved on the secondary core 320, with one end of the secondary elastic element 350 abutting against the secondary piston 340 and the other end abutting against the inner wall of the secondary cover 330. The secondary elastic element 350 can be a spring.

[0071] Optionally, to adjust the holding pressure within the secondary body 300, please refer to... Figure 1 and Figure 3 The secondary cover 330 also includes a spring base 380 and a base adjusting nut 390. The base adjusting nut 390 is threadedly connected to the inner wall of the secondary cover 330. The spring base 380 is positioned on the side of the base adjusting nut 390 closest to the second elastic element. One end of the secondary elastic element 350 abuts against the secondary piston 340, and the other end abuts against the inner wall of the spring base 380. It can be understood that by adjusting the base adjusting nut 390, the volume of the secondary pressure reducing chamber 311 during pressure holding is adjusted, thereby regulating the pressure holding pressure within the secondary body 300.

[0072] In this embodiment, please refer to Figure 1 and Figure 3The secondary core 320 includes a rod 322 and a sealing part 323. The rod 322 passes through the secondary opening 313, and the sealing part 323 is located on the side near the primary pressure reducing chamber 231. The secondary opening 313 has a first inclined surface facing the inner wall of the secondary cylinder 310 on the side near the primary pressure reducing chamber 231, and the sealing part 323 has a second inclined surface on the side near the secondary opening 313. The first inclined surface and the second inclined surface are fitted together and sealed together. The sealing part 323 also has a groove on the side near the primary pressure reducing chamber 231.

[0073] The first inclined surface and the second inclined surface are fitted together and connected by an inclined surface sealing ring.

[0074] The rod 322 of the secondary core 320 is threaded, and a rod adjusting nut 324 is threadedly connected to the rod 322. The rod adjusting nut 324 is located on the side of the secondary piston 340 away from the sealing part 323.

[0075] Under normal conditions, under the action of the secondary elastic element 350, the secondary elastic element 350 pushes the secondary core 320 to move closer to the primary body 200 through the secondary piston 340. At this time, the sealing part 323 of the secondary core 320 opens the secondary opening 313. There is a gap between the rod 322 of the secondary core 320 and the inner wall of the secondary opening 313 of the connecting part 312. The medium-pressure gas in the primary pressure reducing chamber 231 can enter the secondary pressure reducing chamber 311 through the gap.

[0076] Simultaneously, the secondary pressure reduction process of the secondary body 300 is as follows: The medium-pressure gas, after pressure reduction in the primary pressure reduction chamber 231, passes through this gap. When the pressure rises and reaches a certain value, it begins to push the secondary piston 340 to the left, causing the secondary core 320 to move to the left as well. When the pressure continues to rise and reaches a certain value (less than the pressure of the medium-pressure gas after pressure reduction in the primary pressure reduction chamber 231), the secondary piston 340 drives the secondary core 320 to move to the leftmost position, and the first inclined surface and the second inclined surface come into contact, closing the passage between the primary pressure reduction chamber 231 and the secondary pressure reduction chamber 311. This achieves secondary pressure reduction and secondary pressure holding of the medium-pressure gas, that is, reducing the medium-pressure gas in the primary pressure reduction chamber 231 to low-pressure gas.

[0077] Furthermore, the medium-pressure gas in the primary pressure reducing chamber 231 can enter the secondary pressure reducing chamber 311 through the gap, and the low-pressure gas is output from the outlet connector 370 through the built-in gas passage 321 of the rod 322, and is output to the combustion chamber of the engine through the pipeline, where it is burned with the air cooled by the heat exchange body 400 in the combustion chamber.

[0078] It is worth mentioning that the aforementioned primary body 200 and secondary body 300 have the function of reducing pressure on high-pressure gas twice. At the same time, they can also automatically maintain pressure while reducing pressure twice. That is, the pressure reducer body 100 is automatically closed and opened according to the pressure in the primary pressure reducing chamber 231 and the secondary pressure reducing chamber 311, thereby ensuring that low-pressure gas is effectively supplied to the engine system 012.

[0079] Based on the above, the principle and working process of the pressure regulator body 100, which includes a primary body 200 and a secondary body 300 in the above embodiments, in establishing and maintaining pressure is as follows: When the engine system 012 is shut off and the gas is not in use, the gas pressure in the secondary pressure reducing chamber 311 is slowly increased until the gas pushes the fixed secondary piston 340 and the secondary core 320 to move away from the primary body 200. At this time, the secondary elastic element 350 is in a compressed state, and the sealing part 323 of the secondary core 320 closes the secondary opening 313. It can be understood that the passage between the primary pressure reducing chamber 231 and the secondary pressure reducing chamber 311 is closed at this time, thereby establishing pressure maintenance in the secondary pressure reducing chamber 311 of the secondary body 300.

[0080] Furthermore, the passage between the primary pressure reducing chamber 231 and the secondary pressure reducing chamber 311 is closed, and the gas in the primary pressure reducing chamber 231 is slowly pressurized until the gas pushes the primary piston 230 to move toward the side away from the secondary body 300. At this time, the primary spring is in a compressed state, and the end face of the primary piston 230 with the primary opening 232 abuts against the end face of the primary core 210, and the primary opening 232 is closed. It can be understood that at this time, the passage between the primary pressure reducing chamber 231 and the gas flow channel 211 is closed, thereby establishing pressure maintenance in the primary pressure reducing chamber 231 of the primary body 200.

[0081] Based on the above, the principle and working process of automatic pressure balancing of the pressure reducer body 100, which includes a primary body 200 and a secondary body 300 in the above embodiments, are as follows: When the engine system 012 is started and uses gas, the gas in the secondary pressure reducing chamber 311 enters the engine through the outlet connector 370 for combustion. At this time, the pressure in the secondary pressure reducing chamber 311 decreases, the secondary elastic element 350 resets and pushes the fixed secondary piston 340 and secondary core 320 to move towards the side closer to the primary body 200. The sealing part 323 of the secondary core 320 opens the secondary opening 313, so the gas in the primary pressure reducing chamber 231 can enter the secondary pressure reducing chamber 311 through the gap at the secondary opening 313. This continues until the secondary pressure reducing chamber 311 of the secondary body 300 establishes a pressure holding period.

[0082] Furthermore, the gas in the primary pressure-reducing chamber 231 enters the secondary pressure-reducing chamber 311, causing a pressure drop in the primary pressure-reducing chamber 231. At this time, the primary elastic element 240 resets and pushes the primary piston 230 to move towards the side closer to the secondary body 300, opening the passage between the gas flow channel 211 and the primary pressure-reducing chamber 231. The gas in the gas flow channel 211 can then be transported from the primary opening 232 through the primary passage 221 into the primary pressure-reducing chamber 231. This continues until the primary pressure-reducing chamber 231 of the primary body 200 establishes a pressure-holding state.

[0083] Based on the above, the working principle of the pressure reducer 011 in the above embodiments is as follows: Flow control: The ECU control system can control the opening and closing of the housing 510 and the switch core 520 in the solenoid valve switch assembly 500, thereby controlling the flow of gas into the pressure reducer body 100.

[0084] First-stage pressure reduction: The solenoid valve switch assembly 500 delivers gas to the gas flow channel 211. The high-pressure gas in the gas flow channel 211 can be delivered from the first-stage opening 232 through the first-stage passage 221 to the first-stage pressure reducing chamber 231. When the high-pressure gas passes through the gas flow channel 211 and the first-stage opening 232, the narrow gas flow channel 211 and the first-stage opening 232 form a "throttling orifice." The velocity of the high-pressure gas increases sharply when it flows through this point, and the pressure drops sharply at the same time. At this time, when the second gas passage 2112 and the first-stage piston 230 reach the contact position, the cross-sectional area suddenly increases. The area of ​​the second gas passage 2112 near the first-stage piston 230 (including the area of ​​the first-stage piston 230 near the second gas passage 2112) is the main rapid cooling section. This achieves the first-stage pressure reduction of the high-pressure gas, that is, the high-pressure gas is reduced to medium-pressure gas.

[0085] Secondary pressure reduction: The medium-pressure gas in the primary pressure reducing chamber 231, after pressure reduction, passes through this gap. When the pressure rises and reaches a certain value, it begins to push the secondary piston 340 to the left, causing the secondary core 320 to move to the left as well. When the pressure continues to rise and reaches a certain value (less than the pressure of the medium-pressure gas after pressure reduction in the primary pressure reducing chamber 231), the secondary piston 340 drives the secondary core 320 to move to the leftmost position, and the first inclined surface and the second inclined surface come into contact and close the passage between the primary pressure reducing chamber 231 and the secondary pressure reducing chamber 311. This achieves secondary pressure reduction and secondary pressure holding of the medium-pressure gas, that is, reducing the medium-pressure gas in the primary pressure reducing chamber 231 to low-pressure gas.

[0086] Furthermore, the low-pressure gas is output from the outlet connector 370 through the built-in gas passage 321 of the rod body 322, and then output to the combustion chamber of the engine through the pipeline, where it is burned with the air cooled by the heat exchange body 400 in the combustion chamber.

[0087] Meanwhile, the air cooling process is as follows: During the process of the combustion gas changing from high pressure to medium pressure within the first-stage body 200 of the pressure reducer body 100, the combustion gas expands and absorbs a large amount of heat, leading to a rapid cooling of the first-stage body 200. At this time, the air in the intake system 013 is output through the air inlet 412 to the heat exchange chamber 411. The air in the heat exchange chamber 411 exchanges heat with the first-stage body 200, and after being cooled, it is output from the air outlet 413 and through a pipeline to the combustion chamber of the engine. There, it is burned with the reduced pressure from the pressure reducer body 100. This effectively reduces the intake air temperature of the engine system 012.

[0088] Secondly, please refer to Figure 6 The present invention also proposes an engine intake air cooling system 010, comprising: Pressure reducer 011 in the above embodiments; Engine system 012, engine system 012 has a combustion chamber, the combustion chamber is connected to gas outlet 102 and air outlet 413 respectively; Air intake system 013, which is connected to air inlet 412; Gas storage system 014 is connected to gas inlet 101.

[0089] Optionally, the gas storage system 014 may include a CNG storage tank.

[0090] Optionally, the intake system 013 includes an air filter assembly for filtering air.

[0091] Optionally, the engine intake cooling system 010 also includes an air rail 015 and an intake manifold 016. The engine has multiple combustion chambers, and the air rail 015 and intake manifold 016 are connected to each combustion chamber respectively. The air rail 015 is connected to the gas outlet 102 for distributing gas to each combustion chamber. The intake manifold 016 is connected to the air outlet 413 for distributing air to each combustion chamber. This achieves the distribution of gas and air, allowing the gas to enter the combustion chamber for combustion and operation.

[0092] Alternatively, the pressure reducer 011 can be integrated with the intake manifold 016 or placed on the intake line.

[0093] Optionally, the engine intake cooling system 010 also includes an antifreeze reservoir system 017. The antifreeze reservoir system 017 includes at least a reservoir, a water pump, and a heating device connected in sequence. The heating device is used to heat the antifreeze output from the reservoir. Further, the antifreeze reservoir system 017 is connected to the water outlet 214 and the water inlet 213 via pipes and antifreeze connectors 215, respectively, to achieve circulation of heated antifreeze within the water flow channel 212, effectively preventing ice blockage in the pressure reducer body 100.

[0094] Optionally, the engine intake cooling system 010 also includes an ECU control system, which is communicatively connected to the air rail 015 and the solenoid valve switch assembly 500, and can control the opening and closing of both, as well as the flow rate of antifreeze.

[0095] In one embodiment, when the engine system 012 is a naturally aspirated CNG engine, the intake air temperature can be effectively reduced, thereby improving engine performance.

[0096] In one embodiment, when the engine system 012 is a turbocharged CNG engine, the performance of the existing intercooler system can be further reduced, which can save the cost of the existing intercooler system; or the intake air temperature can be further reduced on the basis of the existing intercooler system performance to improve engine performance.

[0097] In summary, the pressure reducer 011 and engine intake cooling system 010 provided in this embodiment of the invention integrate a heat exchange body 400 on the pressure reducer body 100. On the one hand, this achieves the integration of the pressure reducer 011 and the intake system 013, which is beneficial to the overall layout of the engine. On the other hand, by utilizing the principle of high-pressure gas pressure reduction and heat absorption in the pressure reducer body 100, the air in the heat exchange chamber 411 can exchange heat with the pressure reducer body 100, so that the air output from the air outlet 413 to the engine system 012 is effectively cooled, resulting in a higher oxygen content entering the engine system 012 per unit time, thereby improving the power performance, economic performance, emission performance, and intake mass flow rate of the engine system 012.

[0098] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A pressure reducer, characterized in that, include: The pressure regulator body (100) is provided with a gas inlet (101) and a gas outlet (102) connected in series. A heat exchange body (400) is provided with a heat exchange cavity (411) and an air inlet (412) and an air outlet (413) connected to the heat exchange cavity (411). A pressure reducer body (100) is connected to the heat exchange body (400) and passes through the heat exchange cavity (411). The air inlet (412) is used to connect to the intake system (013), and the air outlet (413) is used to connect to the engine system (012).

2. The pressure reducer according to claim 1, characterized in that, The heat exchange body (400) includes a heat exchange shell (410) and a plurality of heat exchange fins (420). The heat exchange shell (410) is sealed to the pressure reducer body (100) and forms the heat exchange cavity (411) with the outer wall of the pressure reducer body (100). The heat exchange shell (410) is provided with the air inlet (412) and the air outlet (413). Multiple heat exchange fins (420) are spaced apart and arranged in the heat exchange cavity (411), and the multiple heat exchange fins (420) are connected to the heat exchange housing (410) and / or the pressure reducer body (100).

3. The pressure reducer according to claim 1, characterized in that, The pressure reducer body (100) includes a primary body (200), which is used to reduce the pressure of the gas in the first stage. The primary body (200) passes through the heat exchange chamber (411) and is located inside the heat exchange chamber (411). The primary body (200) is provided with a primary pressure reducing chamber (231), which is connected to the gas inlet (101) and the gas outlet (102) respectively.

4. The pressure reducer according to claim 3, characterized in that, The primary body (200) includes a primary core (210); the primary core (210) is provided with a gas inlet (101), a gas flow channel (211) and a water flow channel (212), the gas flow channel (211) is connected to the gas inlet (101) and the gas outlet (102) respectively, the water flow channel (212) is located close to the gas flow channel (211), and the water flow channel (212) is used to heat the pressure reducer body (100); The primary pressure reducing chamber (231) is connected to the gas flow channel (211) and the gas outlet (102), respectively.

5. The pressure reducer according to claim 4, characterized in that, The primary body (200) includes a primary cylinder (220), a primary piston (230), and a primary elastic element (240), and the primary core (210) is sleeved inside the primary cylinder (220); The primary cylindrical body (220) is provided with a primary through cavity (221), the primary core (210) is fixedly disposed at one end of the primary through cavity (221), and the primary piston (230) is slidably disposed at the other end of the primary through cavity (221); the primary elastic element (240) is sleeved on the primary piston (230), one end of the primary elastic element (240) is connected to the primary piston (230), and the other end is connected to the primary cylindrical body (220); The first-stage piston (230) is provided with a first-stage opening (232) and a first-stage pressure reducing chamber (231) that are connected together. The first-stage pressure reducing chamber (231) is connected to the gas flow channel (211) through the first-stage opening (232).

6. The pressure reducer according to claim 4, characterized in that, The gas flow channel (211) includes a first gas passage (2111) and at least two second gas passages (2112). One end of the first gas passage (2111) is connected to the gas inlet (101), and the other end is connected to at least two second gas passages (2112). The at least two second gas passages (2112) are spaced apart and connected to the primary pressure reducing chamber (231). The primary core (210) is also provided with a water inlet (213) and a water outlet (214). The water channel (212) includes a first water channel (2121) and a second water channel (2122) that are connected and spaced apart. The first water channel (2121) is connected to the water inlet (213), and the second water channel (2122) is connected to the water outlet (214).

7. The pressure reducer according to claim 4, characterized in that, The pressure reducer body (100) further includes a secondary body (300), which is used to perform secondary pressure reduction on the gas. The secondary body (300) is connected to the primary body (200). Part of the heat exchange body (400) is connected to the primary body (200), and another part of the heat exchange body (400) is connected to the secondary body (300). The inner wall of the heat exchange body (400) and the outer walls of the primary body (200) and the secondary body (300) form the heat exchange cavity (411). The secondary body (300) is provided with a secondary pressure reducing chamber (311), which is connected to the primary pressure reducing chamber (231) and the gas outlet (102).

8. The pressure reducer according to claim 7, characterized in that, The secondary body (300) includes a secondary cylinder (310), a secondary core (320), a secondary cover (330), a secondary piston (340), and a secondary elastic element (350). The secondary cylinder (310) is provided with a secondary pressure reducing chamber (311) and a connecting part (312). The connecting part (312) is provided with a secondary opening (313) and is located on the side of the secondary pressure reducing chamber (311) close to the primary pressure reducing chamber (231). The secondary cover (330) is connected to the secondary cylinder (310) to form the secondary pressure reducing chamber (311). The gas outlet (102) is provided on the secondary cover (330). The secondary core (320) is located inside the secondary pressure reducing chamber (311) and passes through the secondary opening (313). One end of the secondary core (320) passes through the gas outlet (102). The secondary core (320) is slidably disposed relative to the connecting part (312) and is used to open or close the secondary opening (313) under pressure. The secondary core (320) is provided with an internal gas passage (321). The secondary pressure reducing chamber (311) is connected to the gas outlet (102) through the internal gas passage (321). The secondary piston (340) is slidably disposed in the secondary pressure reducing chamber (311), and one end of the secondary piston (340) is limitedly connected to the secondary cylinder (310), and the other end is limitedly connected to the secondary cover (330). The secondary piston (340) is sealed on the secondary core (320) and limitedly connected to the secondary core (320). The secondary elastic element (350) is sleeved on the secondary core (320). One end of the secondary elastic element (350) abuts against the secondary piston (340), and the other end abuts against the inner wall of the secondary cover (330).

9. The pressure reducer according to claim 8, characterized in that, The secondary core (320) includes a rod (322) and a sealing part (323). The rod (322) passes through the secondary opening (313), and the sealing part (323) is located on the side close to the primary decompression chamber (231). The secondary opening (313) has a first inclined surface facing the inner wall of the secondary cylinder (310) on the side near the primary pressure chamber (231), and the sealing part (323) has a second inclined surface on the side near the secondary opening (313). The first inclined surface and the second inclined surface are fitted together and sealed together. The sealing part (323) also has a groove on the side near the primary pressure chamber (231).

10. An engine intake air cooling system, characterized in that, include: The pressure reducer (011) according to any one of claims 1-9; An engine system (012) having a combustion chamber connected to the gas outlet (102) and the air outlet (413); An air intake system (013) is connected to the air inlet (412); Gas storage system (014), which is connected to the gas inlet (101).

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