Warm flow device applied to hydraulic pump

Abstract

The warm flow device applied to the hydraulic pump comprises a warm flow valve mechanism, specifically, a first valve element is arranged in an inner cavity of a shell in a front-back moving mode, and a first elastic piece elastically abuts against the first valve element forwards to the inner side of the front end face of the shell according to preset elastic force; a first oil cavity and a second oil cavity which are communicated are formed in the first valve element, a second oil through hole is formed in the front end face of the shell and communicated with an oil pressure cavity of the hydraulic pump, and a third oil through hole and a fourth oil through hole are formed in the side wall of the shell and communicated with an oil return cavity of the hydraulic pump. A fifth oil through hole and a sixth oil through hole are formed in the front portion and the rear portion of the side wall of the first valve element respectively, and a third oil liquid cavity is formed between the rear portion of the side wall of the first valve element and the inner cavity of the shell and communicated with the second oil liquid cavity and an oil return cavity of the hydraulic pump through the sixth oil through hole and a fourth oil through hole respectively. Therefore, the problem that the hydraulic pump cannot be normally started due to the fact that the viscosity of oil in the hydraulic pump is greatly increased in high-altitude, extremely cold and other low-temperature environments is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and more particularly, to a temperature flow device applied to a hydraulic pump. Background Art

[0002] The hydraulic pump is the "heart" of the aircraft hydraulic system, with extremely high importance and extremely wide application in the hydraulic system. In the aircraft hydraulic system, in addition to hydraulic pumps that operate for a long time, such as engine-driven pumps, there are also hydraulic pumps that are used for a short time, such as emergency pumps, auxiliary pumps, and RAT pumps. The characteristics of this type of hydraulic pump are to perform specific functions or serve as emergency devices, and are used for a short time, but are extremely important at critical moments. Taking the RAT pump as an example, it is the last emergency energy source used by the aircraft after the engine stops and the auxiliary power unit completely fails. If the RAT pump cannot be started normally, it is equivalent to the failure of the last "insurance" of the aircraft, which will directly lead to serious accidents such as plane crashes and deaths.

[0003] Since this type of hydraulic pump is mostly in a standby state, whether the hydraulic pump can be started normally to perform its function is extremely important for functional reliability. Due to the extremely complex airborne working conditions, especially in low-temperature environments such as high altitude and extreme cold, the oil temperature in the hydraulic pump is low, and the oil viscosity increases significantly, which greatly increases the starting torque of the hydraulic pump and may cause the hydraulic pump to fail to start normally. If the high-temperature oil in the hydraulic system can be introduced into the hydraulic pump through a temperature flow device and a thermal cycle can be achieved, so that the hydraulic pump maintains a relatively "warm-up" state, the normal start of the hydraulic pump can be ensured, and the mission reliability can be greatly improved. Summary of the Invention

[0004] To solve the problem that the oil temperature in the hydraulic pump is low and the oil viscosity increases significantly due to low-temperature environments such as high altitude and extreme cold, resulting in the inability of the hydraulic pump to start normally, the present invention provides a temperature flow device applied to a hydraulic pump.

[0005] In a first aspect, the present invention provides a temperature flow device applied to a hydraulic pump, including: A temperature flow valve mechanism fixedly arranged in the first cavity of a hydraulic pump. The temperature flow valve mechanism includes a housing, a first valve core, and a first elastic member. The first valve core is movably arranged back and forth in the inner cavity of the housing. The first elastic member is used to elastically abut the first valve core forward against the inner side of the front end face of the housing according to a preset elastic force. A first oil cavity and a second oil cavity are sequentially arranged in the first valve core. The first oil cavity and the second oil cavity are communicated through a first oil passage hole. A second oil passage hole is opened in the middle of the front end face of the housing. The first oil cavity and the oil pressure cavity of the hydraulic pump are communicated through the second oil passage hole. A third oil passage hole and a fourth oil passage hole are sequentially arranged on the side wall of the housing. Both the third oil passage hole and the fourth oil passage hole are communicated with the oil return cavity of the hydraulic pump. At least two fifth oil passage holes are evenly opened in the circumferential direction on the front part of the side wall of the first valve core on the side where the first oil cavity is located. At least two sixth oil passage holes are evenly opened in the circumferential direction on the rear part of the side wall of the first valve core on the side where the second oil cavity is located. A third oil cavity is formed between the rear part of the side wall of the first valve core and the inner cavity of the housing. The third oil cavity is communicated with the second oil cavity and the oil return cavity of the hydraulic pump through the sixth oil passage hole and the fourth oil passage hole respectively; Wherein, in the natural state of the outer side wall of the first valve core, the fifth oil passage hole is communicated with the third oil passage hole, and the sixth oil passage hole is communicated with the fourth oil passage hole; or, in the working state of the outer side wall of the first valve core, the fifth oil passage hole is not communicated with the third oil passage hole, and the sixth oil passage hole is communicated with the fourth oil passage hole.

[0006] In some embodiments, the diameter of the fifth oil passage hole is smaller than the diameter of the third oil passage hole, and the diameter of the first oil passage hole is smaller than the diameters of the fourth oil passage hole and the sixth oil passage hole.

[0007] In some embodiments, the housing includes a first valve sleeve and a plug. The plug is screwed to the rear end of the first valve sleeve. The inner parts of the first valve sleeve and the plug jointly form the inner cavity of the housing. The second oil passage hole is arranged in the middle of the front end face of the first valve sleeve. A boss is formed at one end of the first valve core facing the side where the first valve sleeve is located. The first valve core is in sliding contact with the inner cavity of the housing through the boss. One end of the first elastic member abuts against the end face located at the bottom of the plug in the inner cavity of the housing, and the other end of the first elastic member abuts against the end face of the boss facing the side where the plug is located.

[0008] In some embodiments, the outer side wall of the plug is provided with a connection thread for screwing and matching with the threaded hole of the first cavity of the hydraulic pump and a first sealing ring for sealing and matching with the end face of the first cavity; The outer side wall of the first valve sleeve is provided with a second sealing ring and a protective ring for sealing with the end face of the first cavity. The oil return cavity of the hydraulic pump is located between the first sealing ring and the second sealing ring. The protective ring is arranged toward the side where the oil return cavity of the hydraulic pump is located, and the second sealing ring is arranged away from the side where the oil return cavity of the hydraulic pump is located.

[0009] In some embodiments, an annular oil groove is provided on the inner wall of the inner cavity of the housing and located inside the front end surface of the first valve sleeve.

[0010] In some embodiments, it also includes a warm flow filtering mechanism fixedly arranged in the second cavity of the hydraulic pump, the warm flow filtering mechanism includes a filter element, a valve assembly, a conical spring and an oil filter plug, the front end of the filter element abuts against the inner side of the front end surface of the second cavity, a third oil cavity is formed between the outer side of the filter element and the second cavity, the third oil cavity is connected to the return oil cavity of the hydraulic pump, a fourth oil cavity is formed on the inner side of the filter element, the oil filter plug is threadedly arranged on the rear end of the valve assembly, the valve assembly abuts against the rear end of the filter element through the conical spring, the valve assembly partially extends into the fourth oil cavity, and the outer side wall of the valve assembly is provided with a third sealing ring for cooperating and sealing with the end face inside the filter element.

[0011] In some embodiments, the valve assembly includes a valve plug, an elastic cylindrical pin, a second valve sleeve, a spring and a second valve core, the second valve sleeve is integrally arranged with a sleeve portion, a connecting portion, a resistance portion and a resistance portion, the second valve sleeve is respectively in contact with the conical spring and the oil filter screw plug through the resistance portion, the second valve sleeve is clamped with the filter element through the resistance portion, the outer surface of the resistance portion is concavely provided with a groove for accommodating the third sealing ring, a through hole is formed inside the second valve sleeve, and the rear part of the side wall of the resistance portion is located on the side where the conical spring is located, and is evenly opened in the circumferential direction to at least two seventh oil holes, at least two eighth oil holes are evenly formed on the side wall of the connecting portion along the circumferential direction, the through holes are respectively communicated with the seventh oil hole and the eighth oil hole, the eighth oil hole is communicated with the fourth oil chamber, the valve plug is fixedly located in the through hole of the sleeve-fitting portion, the elastic cylindrical pin extends through the valve plug and abuts against the inner side wall of the through hole, the spring is used to elastically abut the second valve core backward on the inner side wall of the through hole of the abutting portion according to a preset elastic force, and the other end of the spring abuts against the valve plug; A flow channel is formed between the oil filter screw plug and the filter element, and the third oil chamber and the seventh oil hole are communicated with each other through the flow channel.

[0012] In some embodiments, it further includes a temperature-flow pressure difference warning mechanism fixedly arranged in the third cavity of the hydraulic pump. The temperature-flow pressure difference warning mechanism includes an oil filter indicator. The outer side wall of the oil filter indicator is provided with a connecting thread for screwing and matching with the threaded hole of the third cavity, a fourth sealing ring and a fifth sealing ring for sealing and matching with the end face of the third cavity. One end of the oil filter indicator and the outer side wall of the third cavity form a fifth oil cavity. The fifth oil cavity is located between the fourth sealing ring and the fifth sealing ring, and the fifth oil cavity communicates with the oil return cavity of the hydraulic pump. A sixth oil cavity is formed between the right end of the oil filter indicator and the side wall of the third cavity. A ninth oil through hole is formed at the front end of the second cavity where the filter element is located. The sixth oil cavity communicates with the fourth oil cavity through the ninth oil through hole.

[0013] In some embodiments, it further includes a temperature-flow check mechanism fixedly arranged in the fourth cavity of the hydraulic pump. The temperature-flow check mechanism includes a third valve sleeve, a steel ball, a second spring, a steel ball seat, a retaining ring and a second plug. The second plug is screwed and arranged at the rear end of the third valve sleeve. The interior of the third valve sleeve and the second plug together form a second inner cavity. A tenth oil through hole is arranged in the middle of the front end face of the third valve sleeve. The second inner cavity communicates with the ninth oil through hole through the tenth oil through hole. One end of the second inner cavity located in the third valve sleeve and facing the side where the tenth oil through hole is located forms a second boss. The second spring is used to elastically push the steel ball forward against the second boss according to a preset elastic force. The other end of the second spring abuts against the steel ball seat. The third valve sleeve is provided with an eleventh oil through hole along the circumferential direction between the second boss and the steel ball seat. The eleventh oil through hole communicates with the inlet of the hydraulic pump through the fourth cavity. A retaining ring groove is also arranged inside the third valve sleeve. The retaining ring is placed in the retaining ring groove to limit the steel ball seat.

[0014] In some embodiments, the outer side wall of the second plug is provided with a connecting thread for screwing and matching with the threaded hole of the fourth cavity and a sixth sealing ring for sealing and matching with the end face of the fourth cavity; The outer side wall of the third valve sleeve is provided with a seventh sealing ring for sealing and matching with the end face of the fourth cavity. The inlet of the hydraulic pump is located between the sixth sealing ring and the seventh sealing ring.

[0015] To solve the problem that in the existing technology, due to low temperature environments such as high altitude and extreme cold, the oil temperature in the hydraulic pump is low, and the oil viscosity increases significantly, resulting in the inability of the hydraulic pump to start normally, the present invention has the following advantages: Through the technical solution of the present invention, by using the temperature-flow valve mechanism in the first cavity of the hydraulic pump for design, it is used to adjust and control the flow rate of the oil flowing from the high pressure at the outlet of the hydraulic pump to the oil return cavity of the hydraulic pump housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shows a structural schematic diagram of a temperature flow valve mechanism of a temperature flow device applied to a hydraulic pump; Figure 2 Shows a structural schematic diagram of a temperature flow device applied to a hydraulic pump excluding the temperature flow valve mechanism; Figure 3 Shows Figure 2 a structural schematic diagram of the temperature flow filtering mechanism shown in

[0017] Reference numerals: 1 - first valve sleeve; 2 - second sealing ring; 3 - protective ring; 4 - first valve core; 5 - first elastic member; 6 - first sealing ring; 7 - plug; 8 - oil filter indicator; 9 - fourth sealing ring; 10 - fifth sealing ring; 11 - sealing ring; 12 - filter element; 13 - valve plug; 14 - elastic cylindrical pin; 15 - second valve sleeve; 16 - spring; 17 - second valve core; 18 - eighth sealing ring; 19 - conical spring; 20 - oil filter plug; 21 - third valve sleeve; 22 - seventh sealing ring; 23 - steel ball; 24 - second spring; 25 - steel ball seat; 26 - retaining ring; 27 - sixth sealing ring; 28 - second plug; A1 - first oil chamber; A2 - second oil chamber; A3 - third oil chamber; A4 - fourth oil chamber; A5 - fifth oil chamber; A6 - sixth oil chamber; B1 - first oil passage hole; B2 - second oil passage hole; B3 - third oil passage hole; B4 - fourth oil passage hole; B5 - fifth oil passage hole; B6 - sixth oil passage hole; B7 - seventh oil passage hole; B8 - eighth oil passage hole; B9 - ninth oil passage hole; C - oil pressure chamber of the hydraulic pump; D - oil return chamber of the hydraulic pump; E - hydraulic pump inlet. Detailed implementation manners

[0018] Now, the present disclosure will be described with reference to several exemplary embodiments. It should be understood that these embodiments are described only to enable those of ordinary skill in the art to better understand and thus implement the present disclosure, rather than implying any limitation to the scope of the present disclosure.

[0019] As used herein, the term "comprising" and its variants are to be construed as open-ended terms meaning "including but not limited to". The term "based on" is to be construed as "at least partially based on". The terms "one embodiment" and "an embodiment" are to be construed as "at least one embodiment". The term "another embodiment" is to be construed as "at least one other embodiment". The orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal", etc. is based on the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit that the indicated device, element or component must have a specific orientation, or be constructed and operated in a specific orientation. Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in the present application can be understood according to specific circumstances. In addition, the terms "mounted", "arranged", "provided with", "connected", "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated device, element or component. Unless otherwise specified, the meaning of "a plurality of" is two or more.

[0020] This embodiment discloses a temperature flow device applied to a hydraulic pump, as Figure 1 shown, the temperature flow device includes a temperature flow valve mechanism fixedly arranged in the first cavity of the hydraulic pump.

[0021] In this embodiment, the temperature flow valve mechanism includes: a housing, a first valve core 4, and a first elastic member 5. The first valve core 4 is movably arranged in the inner cavity of the housing in the front-back direction. The first elastic member 5 is used to elastically abut the first valve core 4 forward against the inner side of the front end face of the housing according to a preset elastic force. A first oil chamber A1 and a second oil chamber A2 are sequentially arranged in the first valve core 4. The first oil chamber A1 and the second oil chamber A2 are communicated through a first oil passage B1. A second oil passage B2 is opened in the middle of the front end face of the housing. The first oil chamber A1 and the oil pressure chamber C of the hydraulic pump are communicated through the second oil passage B2. A third oil passage B3 and a fourth oil passage B4 are sequentially arranged on the side wall of the housing. Both the third oil passage B3 and the fourth oil passage B4 are communicated with the oil return chamber D of the hydraulic pump. At least two fifth oil passages B5 are evenly arranged in the circumferential direction on the front part of the side wall of the first valve core 4 on the side where the first oil chamber A1 is located. At least two sixth oil passages B6 are evenly arranged in the circumferential direction on the rear part of the side wall of the first valve core 4 on the side where the second oil chamber A2 is located. A third oil chamber A3 is formed between the rear part of the side wall of the first valve core 4 and the inner cavity of the housing. The third oil chamber A3 is communicated with the second oil chamber A2 and the oil return chamber D of the hydraulic pump through the sixth oil passage B6 and the fourth oil passage B4 respectively; Wherein, in the natural state of the outer side wall of the first valve core 4, the fifth oil passage B5 is communicated with the third oil passage B3, and the sixth oil passage B6 is communicated with the fourth oil passage B4; or, in the working state of the outer side wall of the first valve core 4, the fifth oil passage B5 is not communicated with the third oil passage B3, and the sixth oil passage B6 is communicated with the fourth oil passage B4.

[0022] In this embodiment, a temperature flow device applied to a hydraulic pump is provided. The temperature flow device includes a temperature flow valve mechanism. The temperature flow valve mechanism has a housing accommodated in a first cavity. An inner cavity is formed inside the housing, enabling the first valve core 4 to move in the front-rear direction in the inner cavity. The first elastic member 5 can be a compression spring. The compression spring can elastically abut the first valve core 4 forward against the inner side of the front end face of the housing according to a preset elastic force (the compression spring is in a compressed state at this time). That is, when the first valve core 4 is in the initial position (at this time, the state of the first valve core 4 is in the natural state), the fifth oil passage hole B5 on the first valve core 4 is communicated with the third oil passage hole B3 on the housing, and the sixth oil passage hole B6 on the first valve core 4 is communicated with the fourth oil passage hole B4 on the housing. Thus, the first oil chamber A1 is communicated with the high pressure at the outlet of the hydraulic pump (i.e., communicated with the oil pressure chamber C of the hydraulic pump), and the pressure of the first oil chamber A1 is the same as the outlet high pressure. When the pressure value of the high pressure at the outlet of the hydraulic pump is relatively low, the hydraulic pressure generated by the outlet high pressure fails to overcome the spring force of the elastic member. The third oil passage hole B3 is connected to the fifth oil passage hole B5, and the fourth oil passage hole B4 is connected to the sixth oil passage hole B6. Two oil passages are formed, namely: ① high pressure at the outlet of the hydraulic pump → first oil chamber A1 → fifth oil passage hole B5 → third oil passage hole B3 → oil return chamber D of the hydraulic pump; ② high pressure at the outlet of the hydraulic pump → first oil chamber A1 → first oil passage hole B1 → second oil chamber A2 → sixth oil passage hole B6 → fourth oil passage hole B4 → oil return chamber D of the hydraulic pump. A relatively high temperature flow rate can be maintained when the pressure value of the high pressure at the outlet of the hydraulic pump is relatively low.

[0023] When the pressure value of the high pressure at the outlet of the hydraulic pump is relatively high, the hydraulic pressure generated by the outlet high pressure overcomes the spring force of the elastic member. At this time, the first valve core 4 is in the working state. The fifth oil passage hole B5 is not connected to the third oil passage hole B3, and the sixth oil passage hole B6 is still connected to the fourth oil passage hole B4. One oil passage is formed, namely: ① high pressure at the outlet of the hydraulic pump → first oil chamber A1 → first oil passage hole B1 → second oil chamber A2 → sixth oil passage hole B6 → fourth oil passage hole B4 → oil return chamber D of the hydraulic pump. A particularly high flow rate will not be generated when the pressure value of the high pressure at the outlet of the hydraulic pump is relatively high, so as to avoid imposing too much power burden on the hydraulic system, affecting the working efficiency of the aircraft hydraulic system or causing excessive temperature rise inside the hydraulic pump due to too large a temperature flow rate, resulting in the failure of the hydraulic pump.

[0024] Therefore, the present application designs a temperature flow valve mechanism in the first cavity of the hydraulic pump to adjust and control the flow rate of the oil flowing from the high pressure at the outlet of the hydraulic pump to the oil return chamber D of the hydraulic pump.

[0025] Further, the first spool valve 4 includes a first oil passage hole B1, a fifth oil passage hole B5, a sixth oil passage hole B6, a first oil chamber A1, and a second oil chamber A2. For the stability of the first spool valve 4, the fifth oil passage hole B5 and the sixth oil passage hole B6 are evenly distributed radially, and the number of holes is at least 2. The first oil passage hole B1 is distributed along the axial center and is connected to the first oil chamber A1 and the second oil chamber A2.

[0026] Further, a third oil chamber A3 is formed between the rear part of the side wall of the first spool valve 4 and the inner cavity of the housing. The third oil chamber A3 is respectively connected to the second oil chamber A2 and the oil return chamber D of the hydraulic pump through the sixth oil passage hole B6 and the fourth oil passage hole B4, thereby realizing the second oil passage. In this application, the compression spring is accommodated in the third oil chamber A3, thereby elastically abutting against the first spool valve 4.

[0027] In some embodiments, the diameter of the fifth oil passage hole B5 is smaller than the diameter of the third oil passage hole B3, and the diameter of the first oil passage hole B1 is smaller than the diameter of the fourth oil passage hole B4 and the diameter of the sixth oil passage hole B6.

[0028] In this embodiment, since the first oil passage hole B1 and the fifth oil passage hole B5 are the main oil passage holes for controlling the flow rate of the warm flow, the diameter of the fifth oil passage hole B5 should be smaller than the diameter of the third oil passage hole B3, and the diameter of the first oil passage hole B1 is smaller than the diameter of the fourth oil passage hole B4 and the diameter of the sixth oil passage hole B6. Through the above size settings, the flow rate control effect of the oil in the warm flow valve mechanism can be better.

[0029] In some embodiments, the housing includes a first valve sleeve 1 and a plug 7. The plug 7 is screwed to the rear end of the first valve sleeve 1. The interior of the first valve sleeve 1 and the plug 7 together form the inner cavity of the housing. The second oil passage hole B2 is provided in the middle of the front end face of the first valve sleeve 1. One end of the first spool valve 4 facing the side where the first valve sleeve 1 is located forms a convex platform. The first spool valve 4 slidably contacts the inner cavity of the housing through the convex platform. One end of the first elastic member 5 abuts against the end face of the inner cavity of the housing located at the bottom of the plug 7, and the other end of the first elastic member 5 abuts against the end face of the convex platform facing the side where the plug 7 is located.

[0030] In this embodiment, the housing can be the first valve sleeve 1 and the plug 7. The oil pressure chamber C of the hydraulic pump is formed between the first valve sleeve 1 and the left end of the first spool valve 4, and the oil return chamber D of the hydraulic pump is formed between the first valve sleeve 1 and the side wall of the first cavity. Among them, a spring force is applied to the right end of the first spool valve 4 by the compression spring. In order to position the compression spring, the first spool valve 4 includes a convex platform in the center of the spring 16 to realize the inner diameter positioning of the compression spring, and a spring installation hole is included between the first valve sleeve 1 and the plug 7 to realize the outer diameter positioning of the compression spring.

[0031] In some embodiments, a connection thread for mating and screwing with a threaded hole in the first cavity of the hydraulic pump and a first sealing ring 6 for mating and sealing with the end face of the first cavity are provided on the outer side wall of the plug 7; A second sealing ring 2 and a protective ring 3 for mating and sealing with the end face of the first cavity are provided on the outer side wall of the first valve sleeve 1. The oil return cavity D of the hydraulic pump is located between the first sealing ring 6 and the second sealing ring 2. The protective ring 3 is arranged towards the side where the oil return cavity D of the hydraulic pump is located, and the second sealing ring 2 is arranged away from the side where the oil return cavity D of the hydraulic pump is located.

[0032] In this embodiment, through the above structural arrangement, since the first valve sleeve 1 is connected to the high pressure at the outlet of the hydraulic pump (i.e., communicated with the oil pressure cavity C of the hydraulic pump), in order to maintain the sealing performance, the second sealing ring 2 and the protective ring 3 are provided. Among them, the protective ring 3 is located on the side facing away from the outlet high pressure. In the present application, the protective ring 3 can be set as a circlip, which can prevent the first valve sleeve 1 from loosening from the inner side wall of the first cavity. In order to ensure the low-pressure communication between the plug 7 and the oil return cavity D of the hydraulic pump, the first sealing ring 6 is also provided. In the present application, the above-mentioned sealing rings are preferably made of rubber material.

[0033] In some embodiments, an annular oil passage groove is provided on the inner wall of the inner cavity of the housing on the inner side of the front end face of the first valve sleeve 1. In this embodiment, through the above arrangement, when the first valve core 4 moves rightward under the action of the hydraulic pressure to overcome the spring force, by providing the annular oil passage groove, the oil storage space of the oil pressure cavity C of the hydraulic pump can be increased, and the impact force on the first valve core 4 can be correspondingly reduced, so as to improve the service life of the first valve core 4.

[0034] In some embodiments, such as Figure 2 and Figure 3 shown, a warm flow filtering mechanism fixedly arranged in the second cavity of the hydraulic pump is further included. The warm flow filtering mechanism includes a filter element 12, a valve assembly, a conical spring 19 and an oil filter plug 20. The front end of the filter element 12 abuts against the inner side of the front end face of the second cavity. A third oil chamber A3 is formed between the outer side of the filter element 12 and the second cavity. The third oil chamber A3 is communicated with the oil return cavity D of the hydraulic pump. A fourth oil chamber A4 is formed inside the filter element 12. The oil filter plug 20 is screwed and arranged at the rear end of the valve assembly. The valve assembly abuts against the rear end of the filter element 12 through the conical spring 19. The valve assembly partially extends into the fourth oil chamber A4. A third sealing ring for mating and sealing with the end face inside the filter element 12 is provided on the outer side wall of the valve assembly.

[0035] Furthermore, the valve assembly includes a valve plug 13, an elastic cylindrical pin 14, a second valve sleeve 15, a spring 16 and a second valve core 17, the second valve sleeve 15 is integrally arranged with a sleeve portion, a connecting portion, a contact portion and an abutment portion, the second valve sleeve 15 is respectively in contact with the conical spring 19 and the oil filter screw plug 20 through the abutment portion, the second valve sleeve 15 is clamped with the filter element 12 through the abutment portion, the outer surface of the abutment portion is concavely provided with a groove for accommodating the third sealing ring, a through hole is formed inside the second valve sleeve 15, and the rear part of the side wall of the abutment portion is located on the side where the conical spring 19 is located, and at least Two seventh oil holes B7, at least two eighth oil holes B8 are evenly opened on the side wall of the connecting portion along the circumferential direction, the through holes are respectively communicated with the seventh oil hole B7 and the eighth oil hole B8, the eighth oil hole B8 is communicated with the fourth oil chamber A4, the valve plug 13 is fixedly located in the through hole of the sleeve portion, the elastic cylindrical pin 14 extends through the valve plug 13 and abuts against the inner side wall of the through hole, the spring 16 is used to elastically abut the second valve core 17 backward on the inner side wall of the through hole of the abutting portion according to a preset elastic force, and the other end of the spring 16 abuts against the valve plug 13; A flow passage is formed between the oil filter screw plug 20 and the filter element 12 , and the third oil chamber A3 and the seventh oil hole B7 are connected through the flow passage.

[0036] In this embodiment, the warm flow filter mechanism includes a third sealing ring, a filter element 12, a valve plug 13, an elastic cylindrical pin 14, a second valve sleeve 15, a spring 16, a second valve core 17, a conical spring 19 and an oil filter screw plug 20. Among them, a third oil chamber A3 is formed between the outer side of the filter element 12 and the side wall of the second chamber, and the third oil chamber A3 communicates with the return oil chamber D of the hydraulic pump, and a fourth oil chamber A4 is formed inside the filter element 12. The oil entering the return oil chamber D of the hydraulic pump from the warm flow valve mechanism passes through the third oil chamber A3 and is filtered by the filter element 12 into the fourth oil chamber A4 to achieve clean filtration of the oil.

[0037] Furthermore, in order to prevent the oil filter from being used to the end of its service life or from failing and becoming clogged due to other reasons, resulting in the failure of the warm flow function, a valve assembly is arranged inside the filter element 12, whose main function is that when the pressure in the third oil chamber A3 is greater than the pressure in the fourth oil chamber A4 and is sufficient to overcome the spring force of the spring 16, the sealing cone surface of the second valve sleeve 15 and the second valve core 17 opens, and the oil in the third oil chamber A3 is connected with the fourth oil chamber A4 through the flow channel formed between the oil filter plug 20 and the filter element 12, the seventh oil hole B7 on the side of the second valve sleeve 15, the through hole in the second valve sleeve 15 and the sealing cone surface of the second valve core 17, and the eighth oil hole B8 on the side of the second valve sleeve 15, so as to continue to realize the warm flow function.

[0038] Further, in order to position the spring 16, a boss is provided at one end of the valve plug 13 and the second valve core 17 close to the spring 16 to achieve the inner diameter positioning of the spring 16.

[0039] Further, in order to prevent the valve plug 13 from loosening from the second valve sleeve 15, an elastic dowel pin 14 is provided to achieve the fastening between the two.

[0040] Further, in order to prevent oil from flowing in series, a sealing ring 11 is included between the filter element 12 and the side wall of the second cavity. In order to prevent oil from leaking, an eighth sealing ring 18 is provided between the oil filter plug 20 and the side wall of the second accommodating cavity. In order to prevent oil from leaking through the flow path formed between the oil filter plug 20 and the filter element 12 into the fourth oil cavity A4, a groove for accommodating the third sealing ring is recessed on the outer surface of the abutting portion of the second valve sleeve 15, so that a third sealing ring for sealingly cooperating with the end face inside the filter element 12 is provided on the outer side wall of the second valve sleeve 15.

[0041] Further, in order to prevent the filter element 12 from moving around in a vibrating environment and to enhance positioning, a conical spring 19 is provided between the right end of the filter element 12 and the oil filter plug 20.

[0042] In some embodiments, as Figure 2 shown, it further includes a temperature-flow pressure difference warning mechanism fixedly arranged in the third cavity of the hydraulic pump. The temperature-flow pressure difference warning mechanism includes an oil filter indicator 8. A connecting thread for screw-threading cooperation with the threaded hole of the third cavity and a fourth sealing ring 9 and a fifth sealing ring 10 for sealingly cooperating with the end face of the third cavity are provided on the outer side wall of the oil filter indicator 8. One end of the oil filter indicator 8 forms a fifth oil cavity A5 with the outer side wall of the third cavity. The fifth oil cavity A5 is located between the fourth sealing ring 9 and the fifth sealing ring 10, and the fifth oil cavity A5 communicates with the oil return cavity D of the hydraulic pump. A sixth oil cavity A6 is formed between the right end of the oil filter indicator 8 and the side wall of the third cavity. A ninth oil passage hole B9 is formed at the front end of the second cavity where the filter element 12 is located. The sixth oil cavity A6 communicates with the fourth oil cavity A4 through the ninth oil passage hole B9.

[0043] In this embodiment, the temperature flow pressure difference alarm mechanism includes an oil filter indicator 8, a fourth sealing ring 9 and a fifth sealing ring 10. Among them, a sixth oil liquid chamber A6 is formed between the right end of the oil filter indicator 8 and the side wall of the third cavity, and the sixth oil liquid chamber A6 is connected to the fourth oil liquid chamber A4 through the ninth oil hole B9. A fifth oil liquid chamber A5 is formed between one end of the oil filter indicator 8 and the outer wall of the third cavity, and the fifth oil liquid chamber A5 is located between the fourth sealing ring 9 and the fifth sealing ring 10, and the fifth oil liquid chamber A5 is connected to the return oil chamber D of the hydraulic pump. Among them, if the filter resistance of the filter element 12 is too large, it will cause a pressure difference alarm between the return oil chamber D of the hydraulic pump and the fourth oil liquid chamber A4, thereby realizing an alarm of the status of the oil filter element 12. The form of the oil filter indicator 8 can be selected as mechanical, magnetic, electrical signal or composite.

[0044] Furthermore, in order to accurately realize the function of the temperature flow pressure difference alarm mechanism and accurately reflect whether the oil filter is working normally, the alarm value of the temperature flow pressure difference alarm mechanism should be lower than the opening pressure of the valve assembly set inside the filter element 12.

[0045] Furthermore, in order to prevent false alarms from the temperature flow pressure difference alarm mechanism, the flow capacity and filter resistance of the filter element 12 should be reasonably set in combination with the flow of the temperature flow valve mechanism to avoid false alarms.

[0046] In some embodiments, Figure 2 As shown, it also includes a warm flow check mechanism fixedly arranged in the fourth volume chamber of the hydraulic pump, the warm flow check mechanism includes a third valve sleeve 21, a steel ball 23, a second spring 24, a steel ball 23 seat, a retaining ring 26 and a second screw plug 28, the second screw plug 28 is screwed and arranged at the rear end of the third valve sleeve 21, the interior of the third valve sleeve 21 and the second screw plug 28 together constitute a second inner cavity, the middle part of the front end surface of the third valve sleeve 21 is provided with a tenth oil hole, the second inner cavity is connected with the ninth oil hole B9 through the tenth oil hole, and the second inner cavity is located in the third valve sleeve 21 and a second boss is formed at one end facing the side where the tenth oil hole is located, the second spring 24 is used to elastically push the steel ball 23 forward onto the second boss according to a preset elastic force, the other end of the second spring 24 abuts against the steel ball 23 seat, the third valve sleeve 21 is located between the second boss and the steel ball 23 seat and is provided with an eleventh oil hole along the circumferential direction, the eleventh oil hole is connected with the inlet of the hydraulic pump through the fourth cavity, and a retaining ring 26 groove is further provided on the inner side of the third valve sleeve 21, the retaining ring 26 is accommodated in the retaining ring 26 groove to limit the steel ball 23 seat.

[0047] Furthermore, the outer side wall of the second screw plug 28 is provided with a connecting thread for threaded connection with the threaded hole of the fourth cavity and a sixth sealing ring 27 for sealing with the end surface of the fourth cavity; The outer side wall of the third valve sleeve 21 is provided with a seventh sealing ring 22 for sealing with the end surface of the fourth cavity, and the inlet of the hydraulic pump is located between the sixth sealing ring 27 and the seventh sealing ring 22 .

[0048] In this embodiment, the warm flow check mechanism comprises a third valve sleeve 21, a steel ball 23, a second spring 24, a seat of the steel ball 23, a retaining ring 26, and a second screw plug 28. The third valve sleeve 21 and the steel ball 23 form a sealing surface, and the sealing surface is compressed by the second spring 24. If the oil pressure of the ninth oil hole B9 is sufficient to overcome the elastic force of the second spring 24, the sealing surface is opened, and the ninth oil hole B9 communicates with the hydraulic pump inlet E to achieve the final warm flow circulation.

[0049] Furthermore, in order to maintain the stability of the steel ball 23 and the second spring 24, a steel ball 23 seat is provided on the side of the second spring 24 away from the steel ball 23 to achieve outer diameter positioning of the second spring 24 and stability of the steel ball 23 after opening.

[0050] Furthermore, in order to fix the steel ball 23 seat and adjust the elastic force of the second spring 24 , a retaining ring 26 groove and a retaining ring 26 are provided in the third valve sleeve 21 to achieve axial positioning of the steel ball 23 seat along the second spring 24 .

[0051] Furthermore, in order to achieve oil sealing between the ninth oil hole B9 and the hydraulic pump inlet E, a seventh sealing ring 22 is provided on the three-valve sleeve. In order to prevent oil leakage, a sixth sealing ring 27 is provided.

[0052] In summary, the present invention realizes the warm flow function of the hydraulic pump through the warm flow valve mechanism, warm flow filtering mechanism, warm flow pressure difference alarm mechanism and warm flow check mechanism. The warm flow device realizes the warm flow circulation of oil from the high pressure outlet of the hydraulic pump (hydraulic oil pressure chamber) → hydraulic oil return chamber → hydraulic pump inlet, and realizes the functions of oil filtration, pollution alarm and anti-backflow, which improves the ability of aviation airborne hydraulic pump equipment to cope with low temperature conditions such as high altitude and extreme cold, and greatly improves the mission reliability. In addition, the device is compactly designed, fully adapting to the design trend of small size and lightweight of hydraulic pumps, and the integrated constant power regulation is manually adjustable through a small number of parts, which reduces the processing accuracy requirements for parts, has strong applicability, good economy and broad market prospects.

[0053] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0054] In addition, it should be understood that although this specification is described by way of examples, not every example only contains an independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each example can also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A temperature flow device applied to a hydraulic pump, characterized in that Comprising: A temperature flow valve mechanism fixedly arranged in the first cavity of a hydraulic pump. The temperature flow valve mechanism includes a housing, a first valve core, and a first elastic member. The first valve core is arranged to be movable back and forth in the inner cavity of the housing. The first elastic member is used to elastically abut the first valve core forward against the inner side of the front end face of the housing according to a preset elastic force. A first oil cavity and a second oil cavity are sequentially arranged in the first valve core. The first oil cavity and the second oil cavity are communicated through a first oil passage hole. A second oil passage hole is opened in the middle of the front end face of the housing. The first oil cavity and the oil pressure cavity of the hydraulic pump are communicated through the second oil passage hole. A third oil passage hole and a fourth oil passage hole are sequentially arranged on the side wall of the housing. Both the third oil passage hole and the fourth oil passage hole are communicated with the oil return cavity of the hydraulic pump. At least two fifth oil passage holes are evenly arranged in the circumferential direction on the front part of the side wall of the first valve core on the side where the first oil cavity is located. At least two sixth oil passage holes are evenly arranged in the circumferential direction on the rear part of the side wall of the first valve core on the side where the second oil cavity is located. A third oil cavity is formed between the rear part of the side wall of the first valve core and the inner cavity of the housing. The third oil cavity is communicated with the second oil cavity and the oil return cavity of the hydraulic pump respectively through the sixth oil passage hole and the fourth oil passage hole. Wherein, in the natural state of the outer side wall of the first valve core, the fifth oil passage hole is communicated with the third oil passage hole, and the sixth oil passage hole is communicated with the fourth oil passage hole; or, in the working state of the outer side wall of the first valve core, the fifth oil passage hole is not communicated with the third oil passage hole, and the sixth oil passage hole is communicated with the fourth oil passage hole.

2. The temperature and flow device applied to a hydraulic pump according to claim 1, characterized in that, The diameter of the fifth oil passage hole is smaller than the diameter of the third oil passage hole, and the diameter of the first oil passage hole is smaller than the diameter of the fourth oil passage hole and the diameter of the sixth oil passage hole.

3. The temperature and flow device applied to a hydraulic pump according to claim 1, characterized in that, The housing includes a first valve sleeve and a plug. The plug is screwed on the rear end of the first valve sleeve. The inner parts of the first valve sleeve and the plug together form the inner cavity of the housing. The second oil passage hole is arranged in the middle of the front end face of the first valve sleeve. One end of the first valve core facing the side where the first valve sleeve is located forms a convex platform. The first valve core is in sliding contact with the inner cavity of the housing through the convex platform. One end of the first elastic member abuts against the end face located at the bottom of the plug in the inner cavity of the housing, and the other end of the first elastic member abuts against the end face of the convex platform facing the side where the plug is located.

4. The temperature and flow device applied to a hydraulic pump according to claim 3, characterized in that, The outer side wall of the plug is provided with a connection thread for screw-threading cooperation with the threaded hole of the first cavity of the hydraulic pump and a first sealing ring for sealing cooperation with the end face of the first cavity. The outer side wall of the first valve sleeve is provided with a second sealing ring and a protective ring for sealing cooperation with the end face of the first cavity. The oil return cavity of the hydraulic pump is located between the first sealing ring and the second sealing ring. The protective ring is arranged facing the side where the oil return cavity of the hydraulic pump is located, and the second sealing ring is arranged away from the side where the oil return cavity of the hydraulic pump is located.

5. The temperature and flow device applied to a hydraulic pump as claimed in claim 3, wherein, An annular oil passage groove is arranged on the inner wall of the inner cavity of the housing on the inner side of the front end face of the first valve sleeve.

6. The temperature flow device applied to a hydraulic pump according to claim 1, characterized in that, It further includes a warm flow filtering mechanism fixedly arranged in the second cavity of the hydraulic pump. The warm flow filtering mechanism includes a filter element, a valve assembly, a conical spring, and an oil filter plug. The front end of the filter element abuts against the inner side of the front end face of the second cavity. A third oil chamber is formed between the outer side of the filter element and the second cavity. The third oil chamber is communicated with the oil return chamber of the hydraulic pump. A fourth oil chamber is formed inside the filter element. The oil filter plug is screwed at the rear end of the valve assembly. The valve assembly abuts against the rear end of the filter element through the conical spring. A part of the valve assembly extends into the fourth oil chamber. A third sealing ring for cooperating with the inner end face of the filter element for sealing is arranged on the outer side wall of the valve assembly.

7. The temperature flow device applied to a hydraulic pump according to claim 6, wherein The valve assembly includes a valve plug, an elastic cylindrical pin, a second valve sleeve, a spring, and a second valve core. The second valve sleeve is integrally provided with a fitting portion, a connecting portion, a resisting portion, and an abutting portion. The second valve sleeve contacts the conical spring and the oil filter plug respectively through the abutting portion. The second valve sleeve is clamped with the filter element through the resisting portion. A groove for accommodating the third sealing ring is concavely arranged on the outer surface of the resisting portion. A through hole is formed inside the second valve sleeve. At least two seventh oil through holes are evenly arranged in the circumferential direction on the rear part of the side wall of the resisting portion on the side where the conical spring is located. At least two eighth oil through holes are evenly arranged in the circumferential direction on the side wall of the connecting portion. The through hole is communicated with the seventh oil through hole and the eighth oil through hole respectively. The eighth oil through hole is communicated with the fourth oil chamber. The valve plug is fixedly located in the through hole of the fitting portion. The elastic cylindrical pin penetrates through the valve plug and abuts against the inner side wall of the through hole. The spring is used to elastically push the second valve core backward against the inner side wall of the through hole of the resisting portion according to a preset elastic force. The other end of the spring abuts against the valve plug. A flow channel is formed between the oil filter plug and the filter element. The third oil chamber is communicated with the seventh oil through hole through the flow channel.

8. The temperature and flow device applied to a hydraulic pump according to claim 6, characterized in that, It further includes a warm flow pressure difference warning mechanism fixedly arranged in the third cavity of the hydraulic pump. The warm flow pressure difference warning mechanism includes an oil filter indicator. The outer side wall of the oil filter indicator is provided with a connecting thread for cooperating with the threaded hole of the third cavity for screwing, a fourth sealing ring and a fifth sealing ring for cooperating with the end face of the third cavity for sealing. A fifth oil chamber is formed between one end of the oil filter indicator and the outer side wall of the third cavity. The fifth oil chamber is located between the fourth sealing ring and the fifth sealing ring, and the fifth oil chamber is communicated with the oil return chamber of the hydraulic pump. A sixth oil chamber is formed between the right end of the oil filter indicator and the side wall of the third cavity. A ninth oil through hole is formed at the front end of the second cavity where the filter element is located. The sixth oil chamber is communicated with the fourth oil chamber through the ninth oil through hole.

9. The temperature and flow device applied to a hydraulic pump as claimed in claim 8, characterized in that, It further includes a temperature flow check mechanism fixedly arranged in the fourth cavity of the hydraulic pump. The temperature flow check mechanism includes a third valve sleeve, a steel ball, a second spring, a steel ball seat, a retaining ring and a second plug. The second plug is screwed at the rear end of the third valve sleeve. The interior of the third valve sleeve and the second plug together form a second inner cavity. A tenth oil passage hole is arranged in the middle of the front end face of the third valve sleeve. The second inner cavity communicates with the ninth oil passage hole through the tenth oil passage hole. A second boss is formed at one end of the second inner cavity located in the third valve sleeve and facing the side where the tenth oil passage hole is located. The second spring is used to elastically push the steel ball forward against the second boss according to a preset elastic force. The other end of the second spring abuts against the steel ball seat. The third valve sleeve is provided with an eleventh oil passage hole circumferentially between the second boss and the steel ball seat. The eleventh oil passage hole communicates with the inlet of the hydraulic pump through the fourth cavity. A retaining ring groove is further arranged inside the third valve sleeve. The retaining ring is accommodated in the retaining ring groove to limit the steel ball seat.

10. The temperature and flow device applied to a hydraulic pump according to claim 9, characterized in that, The outer side wall of the second plug is provided with a connection thread for screwing and matching with the threaded hole of the fourth cavity and a sixth sealing ring for sealing and matching with the end face of the fourth cavity; The outer side wall of the third valve sleeve is provided with a seventh sealing ring for sealing and matching with the end face of the fourth cavity. The inlet of the hydraulic pump is located between the sixth sealing ring and the seventh sealing ring.

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