阅读说明：本技术 一种航空发动机用燃油压差自补偿旁路调节阀 (Fuel pressure difference self-compensating bypass regulating valve for aircraft engine ) 是由 赵桥 李纪永 李芳� 何国忠 马阳 林赐轩 于 2021-09-07 设计创作，主要内容包括：本发明公开了一种航空发动机用燃油压差自补偿旁路调节阀,涉及流量调节阀技术领域,解决油路共用油泵时,燃油供应量与发动机需求量不匹配的技术问题,包括设有空腔的阀体,空腔内从上到下依次设有单向阀、节流阀,节流阀包括从上到下依次设置的中心螺塞、节流阀芯、弹簧座,节流阀芯穿设在中心螺塞、弹簧座内,弹簧座、节流阀芯上设有同一节流弹簧,节流阀芯上设有将空腔分为弹簧腔、容置腔的密封胶圈,节流阀芯上设有截面开口面积由上至下逐渐变小的斜槽,阀体上分别设有与容置腔连通的感压通道、与节流阀连通的进油口；本发明能使油路共用油泵时,燃油供应量会随着发动机的需求量而发生变化,使得燃油供应量与发动机的需求量匹配。(The invention discloses a fuel pressure difference self-compensating bypass regulating valve for an aircraft engine, which relates to the technical field of flow regulating valves and solves the technical problem that the fuel supply quantity is not matched with the engine demand quantity when an oil way shares an oil pump, and comprises a valve body provided with a cavity, wherein a one-way valve and a throttle valve are sequentially arranged in the cavity from top to bottom; according to the invention, when the oil way shares the oil pump, the fuel supply quantity can change along with the demand quantity of the engine, so that the fuel supply quantity is matched with the demand quantity of the engine.)

1. The utility model provides a fuel pressure differential self compensating bypass control valve for aeroengine, is including the valve body that is equipped with the cavity, its characterized in that: from the top down is equipped with check valve, choke valve in proper order in the cavity, the choke valve includes central plug screw (1373), throttle valve core (1371), spring holder (124) that from the top down set gradually, throttle valve core (1371) is worn to establish in central plug screw (1373), spring holder (124), be equipped with same throttle spring (123) on spring holder (124), throttle valve core (1371), be equipped with on throttle valve core (1371) and divide into spring chamber (125), the sealed rubber ring (122) in holding chamber with the cavity, be equipped with chute (1372) that cross-sectional open area diminishes from top to bottom gradually on throttle valve core (1371), be equipped with pressure sensing passageway, oil inlet (138) with the choke valve intercommunication with the holding chamber intercommunication on the valve body respectively, oil-out (135) with the check valve intercommunication.

2. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine as claimed in claim 1, wherein a receiving hole (1374) for receiving the throttle valve plug (1371) is formed in the center plug (1373).

3. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine according to claim 1, characterized in that the valve body comprises an upper valve body section (13), a lower valve body section (12) and a filter valve assembly (11) which are sequentially connected from top to bottom and communicated with each other, the upper valve body section (13) is respectively provided with a check chamber (134) and a throttle chamber (137) for accommodating a check valve and a throttle valve, an inner chamber of the lower valve body section (12) is provided with a spring seat (124), a throttle valve core (1371) is arranged in the throttle chamber (137) through a central plug screw (1373), a part of the throttle valve core (1371) penetrating the spring seat (124) is provided with a sealing rubber ring (122) for dividing the inner chamber of the lower valve body section (12) into a spring chamber (125) and an accommodating channel (121), and the accommodating channel (121) and the filter valve assembly (11) form an accommodating chamber.

4. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine is characterized in that the pressure sensing channel comprises a pressure sensing inlet (136) and an inlet channel (1361) which are arranged on an upper section (13) of the valve body in sequence from top to bottom, the lower section (12) of the valve body is provided with a delivery channel (126) communicated with the inlet channel (1361), and the delivery channel (126) is communicated with the filter valve assembly (11).

5. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine according to claim 4, wherein the filter valve assembly (11) comprises a filter valve body (112), a filter table (111) accommodated in the conveying channel (126) is arranged on the filter valve body (112), a filter screen (1113) is arranged at a communication end of the filter table (111) and the conveying channel (126), a pressure sensing outlet (1122) communicated with a groove (1121) of the filter valve body (112) is arranged in the filter valve body (112), a stainless steel pipe (1123) communicated with the filter table (111) is wound on the filter valve body (112), an extending end of the stainless steel pipe (1123) is communicated with the pressure sensing outlet (1122), and the groove (1121) and the accommodating channel (121) form an accommodating cavity.

6. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine is characterized in that the filtering platform (111) comprises a boss (1111) provided with a conical groove (1112), a stainless steel pipe (1123) communicated with the conical groove (1112) is arranged in the boss (1111), and a filter screen (1113) is arranged at a notch of the conical groove (1112).

7. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine according to claim 6, characterized in that an end cover (1125) is arranged on the filter valve body (112), the end cover (1125) and the filter valve body (112) form a winding cavity (1124), and a stainless steel pipe (1123) is wound on the wall of the winding cavity (1124).

8. The fuel pressure difference self-compensating bypass regulating valve for the aircraft engine according to claim 3, characterized in that the check valve comprises a check valve plug screw (131) which is in threaded connection with a check cavity (134), a check valve core (132) is arranged in the check valve plug screw (131) in a penetrating way, a check spring (133) is wound on the upward extending part of the check valve core (132), and a communication hole (1311) which is communicated with the spring cavity (125) is arranged on the check valve plug screw (131).

Technical Field

The invention relates to the technical field of flow regulating valves, in particular to the technical field of fuel pressure difference self-compensation bypass regulating valves for aircraft engines.

Background

Compared with the traditional engine, the turboprop engine has the advantages of high active weight ratio, good starting performance, good high-altitude high-speed performance and the like, and has good application prospects in the fields of micro-miniature medium-high altitude unmanned aerial vehicles, small single-seat airplanes, flying missiles and the like.

In order to make the engine lighter and more convenient to equip and more accord with the design concepts of high integration level, long service life, low cost and the like of modern equipment weapons, a structure that a fuel system and a lubricating oil system share the same oil pump is adopted, so that the oil circuit system is only driven to rotate by one motor. However, the demands for fuel flow and lubricating oil flow are different in the working process of the engine, so that on the premise that the lubricating oil supply quantity meets the use demand, a fuel oil adjusting device is connected to a fuel oil path to guarantee the use demand of the fuel oil flow so as to guarantee the normal use of the engine.

Disclosure of Invention

The invention aims to: in order to solve the technical problem, the invention provides a fuel pressure difference self-compensating bypass regulating valve for an aircraft engine.

The invention specifically adopts the following technical scheme for realizing the purpose:

the utility model provides a fuel pressure differential self compensating bypass governing valve for aeroengine, including the valve body that is equipped with the cavity, from the top down is equipped with the check valve in proper order in the cavity, the choke valve includes the central plug screw that from the top down set gradually, the throttle valve core, the spring holder, the throttle valve core is worn to establish at central plug screw, in the spring holder, be equipped with same throttle spring on the throttle valve core, be equipped with on the throttle valve core and divide into the cavity spring chamber, the sealed rubber ring in holding chamber, be equipped with the chute that cross-sectional opening area diminishes from top to bottom gradually on the throttle valve core, be equipped with the pressure sensing passageway with holding chamber intercommunication on the valve body respectively, the oil inlet with the choke valve intercommunication, the oil-out with the check valve intercommunication.

The central screw plug is internally provided with a containing hole for containing the throttling valve core.

The valve body comprises an upper valve body section, a lower valve body section and a filter valve assembly which are sequentially connected from top to bottom and communicated with each other, the upper valve body section is respectively provided with a one-way cavity for accommodating the one-way valve and the throttle cavity, a spring seat is arranged in an inner cavity of the lower valve body section, a throttle valve core is arranged in the throttle cavity through a central screw plug, a sealing rubber ring for dividing the inner cavity of the lower valve body section into a spring cavity and an accommodating channel is arranged at the part of the throttle valve core penetrating out of the spring seat, and the accommodating channel and the filter valve assembly form an accommodating cavity.

The pressure sensing channel comprises a pressure sensing inlet and an inlet channel which are sequentially arranged on the upper section of the valve body from top to bottom, the lower section of the valve body is provided with a conveying channel communicated with the inlet channel, and the conveying channel is communicated with the filter valve assembly.

The filter valve assembly comprises a filter valve body, a filter table accommodated in the conveying channel is arranged on the filter valve body, a filter screen is arranged at the communicating end of the filter table and the conveying channel, a pressure sensing outlet communicated with a groove of the filter valve body is arranged in the filter valve body, a stainless steel pipe communicated with the filter table is wound on the filter valve body, the extending end of the stainless steel pipe is communicated with the pressure sensing outlet, and the groove and the accommodating channel form an accommodating cavity.

The filtering table comprises a boss provided with a conical groove, a stainless steel pipe communicated with the conical groove is arranged in the boss, and a filter screen is arranged at the notch of the conical groove.

A winding cavity is arranged in the valve body of the filter valve, and a stainless steel pipe is wound on the cavity wall of the winding cavity.

The check valve comprises a check valve plug screw connected in the check cavity in a threaded manner, a check valve core penetrates through the check valve plug screw, a check spring is wound on the part of the check valve core extending upwards, and a communicating hole communicated with the spring cavity is formed in the check valve plug screw.

The invention has the following beneficial effects:

1. according to the invention, the inclined groove is arranged on the throttle valve core, so that the throttle valve core can be matched with the central screw plug in the displacement process to realize the flow regulation of fuel oil, and the fuel oil supply amount can be changed along with the demand of an engine when an oil way shares an oil pump because the flow of the fuel oil can be regulated, so that the fuel oil supply amount is matched with the demand of the engine, the normal atomization of an engine nozzle can be ensured when the minimum fuel oil is supplied, and the pressure before the nozzle is maintained to be normal and stable when the maximum fuel oil is supplied.

2. In the invention, the opening area of the cross section of the chute is gradually reduced from top to bottom, so that the flow regulation of fuel oil can be realized in the displacement process of the throttle valve core.

3. In the invention, the throttle valve core is arranged in the central screw plug and is in clearance fit with the containing hole, so when the pressure in the containing cavity is greater than the pressure of the spring cavity, the thrust acting on the lower end surface of the throttle valve core is gradually increased and starts to push the throttle valve core to overcome the elastic force of the throttle spring to move upwards, and in the process of moving upwards, the opening area of the chute can change along with the pressure difference between the containing cavity and the spring cavity, the opening area of the chute is smaller and smaller along with the continuous increase of the pressure difference, otherwise, the opening area of the chute is larger and larger, and the size of the oil drainage flow depends on the opening area of the chute.

4. In the invention, the inner cavity of the lower section of the valve body is divided into a spring cavity and an accommodating channel through a sealing rubber ring, the accommodating channel and the filtering valve body assembly form an accommodating cavity, the same pressure sensing channel is arranged on the upper section of the valve body and the lower section of the valve body, the pressure sensing channel is communicated with the accommodating cavity, when the pressure of the accommodating cavity is greater than that of the spring cavity, the throttle valve core begins to overcome the elastic force of the throttle spring, the opening area of the chute is smaller and smaller along with the continuous increase of the pressure difference, the oil drainage flow is smaller, otherwise, the opening of the chute is larger and larger, therefore, the pressure balance formed by the oil pressure difference between the spring cavity and the accommodating cavity and the pretightening force of the throttle spring determines the displacement of the throttle valve core, and the self-compensation adjustment of fuel is realized by the cooperation of the chute and the accommodating hole.

5. In the invention, the upper section of the valve body is provided with the inlet channel, the lower section of the valve body is provided with the connecting channel, the inlet channel and the conveying channel are slender small holes, and the slender stainless steel pipe is wound on the valve body of the one-way valve, so that the flow resistance of fuel oil can be increased, the stability of pressure sensing outlet pressure can be maintained, and the stable regulation of flow can be realized.

6. In the invention, the filter screen arranged in the conical groove can effectively filter out particle pollutants in the fuel oil, prevent the stainless steel pipe from being blocked, is convenient and fast to disassemble and easy to clean, and can also ensure the service life of the whole fuel oil bypass regulating valve; the tapered slot can be convenient for the fuel after the filtration to flow into in the stainless steel pipe.

7. In the invention, because the one-way valve plug screw is connected in the one-way cavity in a threaded manner, a worker can adjust the initial compression amount of the one-way spring, thereby realizing the regulation and control of the pressure relief opening threshold value of the one-way valve.

Drawings

FIG. 1 is a schematic diagram of the oil circuit of the present invention;

FIG. 2 is a schematic structural view of the present invention;

FIG. 3 is an enlarged view of a portion of FIG. 2;

FIG. 4 is a schematic view of the connection of the oil outlet to the one-way chamber;

FIG. 5 is a schematic view of the connection of the oil outlet to the upper section of the valve body;

FIG. 6 is an exploded view of FIG. 5;

FIG. 7 is a schematic view of the connection of the oil inlet to the upper section of the valve body;

FIG. 8 is a bottom view of FIG. 7;

FIG. 9 is a diagrammatic sectional view of B-B of FIG. 8;

FIG. 10 is a schematic view of the structure of the receiving hole;

FIG. 11 is a schematic view of the connection of the upper valve body section to the lower valve body section;

FIG. 12 is a schematic view of the construction of the filter valve assembly;

reference numerals: 11 filtering valve component, 111 filtering table, 1111 boss, 1112 taper groove, 1113 filter screen, 112 filtering valve body, 1121 groove, 1122 pressure sensing outlet, 1123 stainless steel pipe, 1124 winding cavity, 1125 end cover, 12 valve body lower section, 121 accommodating channel, 122 sealing rubber ring, 123 throttling spring, 124 spring seat, 125 spring cavity, 126 conveying channel, 13 valve body upper section, 131 check valve plug screw, 1311 communicating hole, 132 check valve core, 133 check spring, 134 check cavity, 135 oil outlet, 136 pressure sensing inlet, 1361 inlet channel, 137 throttling cavity, 1371 throttling valve core, 1372 chute, 1373 central plug screw, 1374 accommodating hole, 138 oil inlet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

As shown in fig. 1 to 9, the embodiment provides a fuel pressure difference self-compensating bypass regulating valve for an aircraft engine, including the valve body that is equipped with the cavity, from the top down is equipped with the check valve in proper order in the cavity, the choke valve includes the central plug 1373 that sets gradually from the top down, throttle valve core 1371, spring holder 124, throttle valve core 1371 wears to establish at central plug 1373, in the spring holder 124, be equipped with same throttle spring 123 on the throttle valve core 1371, be equipped with on the throttle valve core 1371 and divide into spring chamber 125 with the cavity, the packing rubber 122 of holding chamber, be equipped with the chute 1372 that the cross-sectional opening area gradually diminishes from top to bottom on the throttle valve core 1371, be equipped with the pressure sensing passageway that communicates with the holding chamber on the valve body respectively, oil inlet 138 with the choke valve intercommunication, oil-out 135 with the check valve intercommunication.

In the embodiment, the throttle valve 1371 can realize the flow regulation of fuel in the displacement process through the inclined groove 1372, and the fuel supply amount can be changed along with the demand of an engine when an oil way shares an oil pump because the flow of the fuel can be regulated, so that the fuel supply amount is matched with the demand of the engine; wherein, the hydraulic circuit of the engine shares a pump, in the initial state, the engine has a high demand for lubricating oil, and the power of the pump is larger, and the supply of fuel oil is increased, and the supply far exceeds the demand of fuel oil flow, because the pressure in the spring chamber 125 is higher than the opening threshold of the check valve, the check valve is in the normally open state to release pressure, and the opening area of the chute 1372 is gradually reduced from top to bottom, so the opening area is the largest and the flow rate is the largest, the pressure releasing capability of the check valve is the strongest, as the oil consumption of the engine is increased, the pressure in the accommodating chamber starts to be gradually increased, the oil pressure entering from the oil inlet 138 after subtracting the oil consumption of the engine forms the pressure of the spring chamber 125, when the pressure in the accommodating chamber is greater than the pressure of the spring chamber 125, the thrust acting on the lower end surface of the throttle valve core 1371 is gradually increased, and the throttle valve core 1371 starts to overcome the upward movement of the elastic force of the throttle spring 123, with the continuous increase of the pressure difference between the accommodating cavity and the spring cavity 125, the opening area of the inclined groove 1372 is smaller, the fuel quantity entering the spring cavity 125 from the oil inlet 138 is also gradually reduced, finally, when the engine rotates at the full speed, the pressure of the oil inlet 138 is zero, the pressure in the spring cavity 125 is lower than the opening threshold of the one-way valve, the one-way valve is closed, all the fuel is supplied to the engine, the oil pressure required by the nozzle is stable, and all the fuel is supplied to the engine, so that the fuel supply quantity is guaranteed to be matched with the demand quantity of the engine, the normal atomization of the nozzle of the engine in the minimum fuel supply is guaranteed, and the pressure before the nozzle in the maximum fuel supply is normally maintained.

Example 2

As shown in fig. 1 to 10, in the first embodiment, a receiving hole 1374 for receiving the throttle valve 1371 is formed in a center plug 1373.

In this embodiment, because the throttle valve 1371 is accommodated in the accommodating hole 1374, and the opening area of the chute 1372 on the throttle valve 1371 becomes smaller from top to bottom, the throttle valve 1371 can realize the opening area adjustment of fuel circulation in the process of displacement, thereby realizing the adjustment of the flow of the oil inlet of the throttle valve from large to small, and enabling the engine to obtain reasonable fuel supply.

Example 3

As shown in fig. 1 to 12, on the basis of the first embodiment, the valve body provided in this embodiment includes a valve body upper section 13, a valve body lower section 12, and a filter valve assembly 11, which are sequentially connected and communicated from top to bottom, the valve body upper section 13 is respectively provided with a check chamber 134 for accommodating a check valve and a throttle valve, and a throttle chamber 137, the inner chamber of the valve body lower section 12 is provided with a spring seat 124, the throttle chamber 137 is internally provided with a throttle valve core 1371 through a central plug 1373, the portion of the throttle valve core 1371 penetrating the spring seat 124 is provided with a sealing rubber ring 122 for dividing the inner chamber of the valve body lower section 12 into a spring chamber 125 and an accommodating passage 121, and the accommodating passage 121 and the filter valve assembly 11 constitute an accommodating chamber.

Further, the pressure sensing channel comprises a pressure sensing inlet 136 and an inlet channel 1361 which are arranged on the upper section 13 of the valve body in sequence from top to bottom, the lower section 12 of the valve body is provided with a conveying channel 126 communicated with the inlet channel 1361, and the conveying channel 126 is communicated with the filter valve assembly 11.

Further, the filter valve assembly 11 includes a filter valve body 112, the filter valve body 112 is provided with a filter stage 111 accommodated in the conveying passage 126, a filter screen 1113 is disposed at a communication end of the filter stage 111 and the conveying passage 126, a pressure sensing outlet 1122 communicated with a groove 1121 of the filter valve body 112 is disposed in the filter valve body 112, a stainless steel pipe 1123 communicated with the filter stage 111 is wound on the filter valve body 112, an extending end of the stainless steel pipe 1123 is communicated with the pressure sensing outlet 1122, and the groove 1121 and the accommodating passage 121 form an accommodating cavity.

Further, the filtering platform 111 comprises a boss 1111 provided with a conical groove 1112, a stainless steel pipe 1123 communicated with the conical groove 1112 is arranged in the boss 1111, and a filtering net 1113 is arranged at the notch of the conical groove 1112.

Furthermore, an end cover 1125 is disposed on the filter valve body 112, the end cover 1125 and the filter valve body 112 form a winding chamber 1124, and a stainless steel pipe 1123 is wound on the chamber wall of the winding chamber 1124.

Further, the check valve comprises a check valve plug screw 131 which is in threaded connection with the check cavity 134, a check valve core 132 penetrates through the check valve plug screw 131, a check spring 133 is wound on the upward extending portion of the check valve core 132, and a communication hole 1311 which is communicated with the spring cavity 125 is formed in the check valve plug screw 131.

In this embodiment, when the engine is ignited, as the fuel consumption increases, the pressure in the accommodating chamber increases, the pressure in the spring chamber 125 decreases, and the pressure difference between the pressure in the accommodating chamber and the pressure in the spring chamber 125 causes the throttle to move upward, that is, the pressure difference between the spring chamber 125 and the accommodating chamber is expressed by the following formula:

Δp＝P₁-P₂；

when Δ P is less than or equal to Δ P₀When Δ x is 0; (1)

when Δ P₀≤ΔP≤ΔP₁When Δ x is equal to (Δ P · a-F)₀)/K2；(2)

When Δ P₁≤ΔP≤ΔP₂When Δ x is equal to Δ x₂；(3)

Wherein, the pressure difference between the spring cavity 125 and the accommodating cavity is Δ P, Δ P₀Pressure differential, Δ P, for initial operation of spring chamber 125 and pocket chamber₁Is the pressure difference, Δ P, at the time of displacement of the inclined slot 1372₂The pressure difference when the opening of the chute 1372 is minimum is contained in the containing chamber P₁Spring chamber 125 is P₂(ii) a The displacement of the flow valve core 1371 is delta x, the rigidity of the throttle spring 123 is K2, and the pretightening force of the throttle spring is F₀The effective area of the fluid acting on the spool is a. When the pressure difference Δ P between the spring chamber 125 and the accommodating chamber is smaller than Δ P₀At this time, the valve core displacement deltax is 0; as Δ P increases, when throttle valve core 1371 begins to move against the force of throttle spring 123, when the pressure differential Δ P between spring chamber 125 and the receiving chamber is greater than Δ P₀Pressure difference Δ P smaller than minimum value of opening degree of throttle chute 1373₁The corresponding displacement amount can be expressed by formula (2); with further increase of the pressure difference Δ P, the opening area of the chute 1372 decreases to zero, i.e., the pressure difference Δ P reaches Δ P₂At this time, throttle valve 1371 stops moving, and displacement Δ x is equal to Δ x₂。

The relationship between the opening area S of the chute 1372 and the displacement Δ x of the throttle valve body 1371 is:

wherein D is the diameter of the throttle valve core 1371,h is the maximum depth of the chute 1372, L is the chute length, x₀The distance from the receiving hole to the position of maximum depth of the inclined slot 1372 at the initial position.

The diameter of the one-way cavity is d whenWhen the pressure difference between the spring cavity 125 and the accommodating cavity is higher than the threshold value of the one-way valve, the one-way valve core is opened to release pressure, and when the pressure difference is higher than the threshold value of the one-way valve, the pressure of the one-way valve core is releasedWhen the pressure difference between the spring cavity 125 and the accommodating cavity is smaller than the threshold value of the one-way valve, the one-way valve core 132 is closed, and the oil pressure required by the nozzle is kept stable; wherein, F₁The pre-tightening force value of the one-way spring 133 is the threshold value of the one-way valve.

Specifically, the check cavity 134 fixes the check valve, which can provide a supporting point for the check valve, the throttle cavity 137 fixes the central plug 1373, which can provide a supporting point for the displacement of the throttle valve core 1371, fuel oil can enter the spring cavity 125 through the oil inlet 138, the spring cavity 125 is communicated with the check cavity 134 through the communication hole 1311, and redundant fuel oil can be discharged through the oil outlet 135 communicated with the check cavity 134, so that a complete fuel oil path is formed; the sealing rubber ring 122 can ensure the tightness of the spring cavity 125.

Specifically, in this embodiment, the pressure sensing inlet 136, the inlet channel 1361, the delivery channel 126, the stainless steel pipe 1123, and the pressure sensing outlet 1122 are communicated, and the inlet channel 1361, the delivery channel 126, and the stainless steel pipe 1123 are all elongated small holes, which has the characteristics of small flow area and long flow channel, and can increase the flow resistance of the fuel oil, so as to maintain the stability of the pressure sensing outlet 1122, and thus, the stable adjustment of the flow rate is realized.

Specifically, because the one-way valve plug screw 131 is in threaded connection with the inner wall of the one-way cavity 134, a worker can adjust the initial compression amount of the one-way spring 133, so that the regulation and control of the opening threshold value of the pressure relief valve are realized; when the one-way valve is opened for pressure relief, fuel flows out through the communication hole 1311 and the oil outlet 135 in sequence and enters an inlet of the fuel pump.