A warm flow device used in hydraulic pump

Abstract

The present invention relates to a thermal flow device for use in a hydraulic pump, comprising a thermal flow valve mechanism, specifically a first valve core movable forward and backward within an inner cavity of a housing, a first elastic member elastically abutting the first valve core against the inner front face of the housing according to a preset elastic force, a first oil chamber and a second oil chamber being provided within the first valve core, a second oil hole being provided in the front face of the housing and communicating with the oil pressure chamber of the hydraulic pump, a third oil hole and a fourth oil hole being provided in the side wall of the housing and communicating with the oil return chamber of the hydraulic pump, respectively, a fifth oil hole and a sixth oil hole being provided in the front and rear portions of the side wall of the first valve core, respectively, and a third oil chamber being formed between the rear portion of the side wall of the first valve core and the inner cavity of the housing and communicating with the second oil chamber and the oil return chamber of the hydraulic pump via the sixth and fourth oil holes, respectively. This solves the problem of a hydraulic pump failing to start normally due to a significant increase in oil viscosity within the hydraulic pump caused by low temperatures, such as high altitude or extreme cold.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, and in particular to a warm flow device used in a hydraulic pump. Background Art

[0002] The hydraulic pump is the "heart" of the aircraft's hydraulic system. It is extremely important and widely used in the hydraulic system. In addition to long-term hydraulic pumps such as engine-driven pumps, aircraft hydraulic systems also include short-term hydraulic pumps such as emergency pumps, auxiliary pumps, and RAT pumps. The characteristics of this type of hydraulic pump are that it performs specific functions or serves as an emergency device for short-term use, but it is extremely important at critical moments. Take 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 has completely failed. If the RAT pump cannot be started normally, it is equivalent to the failure of the aircraft's last "safety" and will directly lead to serious accidents such as aircraft destruction and death.

[0003] Since this type of hydraulic pump is often in standby mode, its ability to start and execute properly is crucial to its reliability. Due to the extremely complex operating conditions onboard, especially in low-temperature environments like high altitude and extreme cold, the oil temperature within the hydraulic pump can drop, significantly increasing its viscosity and the starting torque, which can lead to a failure to start the pump properly. If a warm flow device could be used to direct the high-temperature hydraulic oil into the hydraulic pump and achieve a thermal cycle, keeping the pump relatively "warm," it would ensure proper startup and significantly improve mission reliability. Summary of the Invention

[0004] In order to solve the problem that the hydraulic pump cannot start normally due to low oil temperature and significant increase in oil viscosity in low temperature environments such as high altitude and extreme cold, the present invention provides a warm flow device for use in the hydraulic pump.

[0005] In a first aspect, the present invention provides a warm flow device for use in a hydraulic pump, comprising:

[0006] A temperature flow valve mechanism is fixedly arranged in a first volume chamber of a hydraulic pump, the temperature flow valve mechanism comprising a housing, a first valve core and a first elastic member, the first valve core being arranged in an inner chamber of the housing so as to be movable forward and backward, the first elastic member being used to elastically push the first valve core forward against the inner side of the front end surface of the housing according to a preset elastic force, a first oil chamber and a second oil chamber being sequentially arranged in the first valve core, the first oil chamber and the second oil chamber being connected via a first oil through hole, a second oil through hole being provided in the middle of the front end surface of the housing, the first oil chamber and the oil pressure chamber of the hydraulic pump being connected via the second oil through hole, The side wall of the housing is sequentially provided with a third oil hole and a fourth oil hole, both of which are connected to the oil return chamber of the hydraulic pump. At least two fifth oil holes are uniformly formed in the circumference of the side wall of the first valve core, which is located on the side where the first oil chamber is located. At least two sixth oil holes are uniformly formed in the circumference of the side wall of the first valve core, which is located on the side where the second oil chamber is located. A third oil chamber is formed between the rear portion of the side wall of the first valve core and the inner cavity of the housing. The third oil chamber is connected to the second oil chamber and the oil return chamber of the hydraulic pump through the sixth oil hole and the fourth oil hole, respectively.

[0007] Among them, when the outer wall of the first valve core is in a natural state, the fifth oil hole is connected to the third oil hole, and the sixth oil hole is connected to the fourth oil hole; or, when the outer wall of the first valve core is in a working state, the fifth oil hole is not connected to the third oil hole, and the sixth oil hole is connected to the fourth oil hole.

[0008] In some embodiments, the diameter of the fifth oil hole is smaller than the diameter of the third oil hole, and the diameter of the first oil hole is smaller than the diameter of the fourth oil hole and the diameter of the sixth oil hole.

[0009] In some embodiments, the shell includes a first valve sleeve and a screw plug, the screw plug is threadedly arranged at the rear end of the first valve sleeve, the interior of the first valve sleeve and the screw plug together constitute the inner cavity of the shell, the second oil hole is arranged in the middle of the front end surface of the first valve sleeve, and a boss is formed at one end of the first valve core facing the first valve sleeve, and the first valve core slides in contact with the inner cavity of the shell through the boss, one end of the first elastic member abuts the end surface of the inner cavity of the shell where the bottom of the screw plug is located, and the other end of the first elastic member abuts the end surface of the boss facing the screw plug.

[0010] In some embodiments, the outer wall of the screw plug is provided with a connecting thread for threaded connection with the threaded hole of the first cavity of the hydraulic pump and a first sealing ring for sealing with the end surface of the first cavity;

[0011] The outer side wall of the first valve sleeve is provided with a second sealing ring and a protective ring for cooperating and sealing with the end face of the first cavity. The return oil chamber 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 return oil chamber of the hydraulic pump is located, and the second sealing ring is arranged away from the side where the return oil chamber of the hydraulic pump is located.

[0012] 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.

[0013] 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 face 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.

[0014] 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 contacts the conical spring and the oil filter plug respectively 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 uniformly opened in the circumference to at least two seventh oil holes, at least two eighth oil holes are uniformly 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 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 push the second valve core backward to contact 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;

[0015] A flow channel is formed between the oil filter plug and the filter element, and the third oil chamber and the seventh oil hole are communicated with each other through the flow channel.

[0016] In some embodiments, it also includes a temperature-flow pressure difference alarm mechanism fixedly arranged in the third chamber of the hydraulic pump, the temperature-flow pressure difference alarm mechanism includes an oil filter indicator, the outer wall of the oil filter indicator is provided with a connecting thread for threaded connection with the threaded hole of the third chamber and a fourth sealing ring and a fifth sealing ring for sealing with the end face of the third chamber, one end of the oil filter indicator and the outer wall of the third chamber form a fifth oil chamber, the fifth oil chamber is located between the fourth sealing ring and the fifth sealing ring, and the fifth oil chamber is connected to the return oil 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 chamber, the second chamber is located at the front end of the filter element to form a ninth oil hole, and the sixth oil chamber is connected to the fourth oil chamber through the ninth oil hole.

[0017] In some embodiments, the invention further includes a warm flow check mechanism fixedly arranged in the fourth chamber of the hydraulic pump, the warm flow check mechanism including a third valve sleeve, a steel ball, a second spring, a steel ball seat, a retaining ring and a second screw plug. The second screw plug is screwed to the rear end of the third valve sleeve, and the interiors of the third valve sleeve and the second screw plug together constitute a second inner chamber. A tenth oil hole is provided in the middle of the front end surface of the third valve sleeve, and the second inner chamber is connected to the ninth oil hole through the tenth oil hole. The second inner chamber is located in the third valve sleeve and has a second boss formed on one end facing the tenth oil hole. 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 circumferentially formed with an eleventh oil hole between the second boss and the steel ball seat. The eleventh oil hole is connected to the inlet of the hydraulic pump through the fourth chamber. A retaining ring groove is also provided on the inner side of the third valve sleeve. The retaining ring is accommodated in the retaining ring groove to limit the steel ball seat.

[0018] In some embodiments, the outer wall of the second screw plug is provided with a connecting thread for threaded connection with the threaded hole of the fourth cavity and a sixth sealing ring for sealing with the end surface of the fourth cavity;

[0019] The outer side wall of the third valve sleeve is provided with a seventh sealing ring for cooperating and sealing with the end surface of the fourth cavity, and the inlet of the hydraulic pump is located between the sixth sealing ring and the seventh sealing ring.

[0020] In order to solve the existing problem that the hydraulic pump cannot start normally due to the low oil temperature in the hydraulic pump and the significant increase in oil viscosity in low-temperature environments such as high altitude and extreme cold, the present invention has the following advantages:

[0021] Through the technical solution of the present invention, a temperature flow valve mechanism is designed in the first chamber of the hydraulic pump to adjust and control the flow rate of the high-pressure oil flowing from the hydraulic pump outlet to the oil return chamber of the hydraulic pump housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic structural diagram of a warm flow valve mechanism of a warm flow device used in a hydraulic pump is shown;

[0023] Figure 2 A schematic structural diagram of a warm flow device used in a hydraulic pump without a warm flow valve mechanism is shown;

[0024] Figure 3 Shown Figure 2 The structural diagram of the warm flow filtration mechanism is shown in FIG.

[0025] Figure 1: 1st valve sleeve; 2nd sealing ring; 3rd protection ring; 4th first valve core; 5th first elastic member; 6th first sealing ring; 7th screw plug; 8th oil filter indicator; 9th fourth sealing ring; 10th fifth sealing ring; 11th sealing ring; 12th filter element; 13th valve plug; 14th elastic cylindrical pin; 15th second valve sleeve; 16th spring; 17th second valve core; 18th eighth sealing ring; 19th conical spring; 20th oil filter screw plug; 21th third valve sleeve; 22th seventh sealing ring; 23th steel ball; 24th second spring; 25th steel Ball seat; 26- retaining ring; 27- sixth sealing ring; 28- second screw 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 hole; B2- second oil hole; B3- third oil hole; B4- fourth oil hole; B5- fifth oil hole; B6- sixth oil hole; B7- seventh oil hole; B8- eighth oil hole; B9- ninth oil hole; C- oil pressure chamber of hydraulic pump; D- oil return chamber of hydraulic pump; E- inlet of hydraulic pump. DETAILED DESCRIPTION

[0026] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and implement the present disclosure, rather than to imply any limitation on the scope of the present disclosure.

[0027] As used herein, the term "including" and its variations are to be interpreted as open-ended terms meaning "including, but not limited to." The term "based on" is to be interpreted as "based, at least in part, on." The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment." The term "another embodiment" is to be interpreted as "at least one other embodiment." Terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "vertical," "horizontal," "transverse," and "longitudinal" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. These terms are primarily intended to better describe the present application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationships. For example, the term "on" may, in certain circumstances, be used to indicate a dependency or connection relationship. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances. Furthermore, the terms "installed," "disposed," "provided with," "connected," and "connected" are to be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the 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 or quantity of the indicated devices, elements, or components. Unless otherwise specified, "plurality" means two or more.

[0028] This embodiment discloses a warm flow device used in a hydraulic pump, such as Figure 1 As shown, the warm flow device includes a warm flow valve mechanism fixedly arranged in the first volume chamber of the hydraulic pump.

[0029] 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 arranged in the inner cavity of the housing and can move forward and backward. The first elastic member 5 is used to elastically push the first valve core 4 forward to the inner side of the front end surface of the housing according to a preset elastic force. The first oil chamber A1 and the 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 connected through a first oil hole B1. A second oil hole B2 is opened in the middle of the front end surface of the housing. The first oil chamber A1 and the oil pressure chamber C of the hydraulic pump are connected through the second oil hole B2. The side walls of the housing are sequentially provided with There are a third oil hole B3 and a fourth oil hole B4, both of which are connected to the oil return chamber D of the hydraulic pump. At least two fifth oil holes B5 are evenly distributed in the circumference of the front portion of the side wall of the first valve core 4, located on the side where the first oil chamber A1 is located. At least two sixth oil holes B6 are evenly distributed in the circumference of the rear portion of the side wall of the first valve core 4, located on the side where the second oil chamber A2 is located. A third oil chamber A3 is formed between the rear portion of the side wall of the first valve core 4 and the inner cavity of the housing. The third oil chamber A3 is connected to the second oil chamber A2 and the oil return chamber D of the hydraulic pump through the sixth oil hole B6 and the fourth oil hole B4 respectively.

[0030] Among them, when the outer wall of the first valve core 4 is in a natural state, the fifth oil hole B5 is connected to the third oil hole B3, and the sixth oil hole B6 is connected to the fourth oil hole B4; or, when the outer wall of the first valve core 4 is in a working state, the fifth oil hole B5 is not connected to the third oil hole B3, and the sixth oil hole B6 is connected to the fourth oil hole B4.

[0031] In this embodiment, a temperature flow device for use in a hydraulic pump is provided. The temperature flow device includes a temperature flow valve mechanism comprising a housing housed in a first chamber. The housing defines an inner chamber within which a first valve core 4 can move forward and backward within the inner chamber. A first elastic member 5, which may be a compression spring, elastically presses the first valve core 4 forward against the inner front face of the housing under a predetermined elastic force (the compression spring is compressed). Specifically, when the first valve core 4 is in its initial position (i.e., in its natural state), communication is established between the fifth oil hole B5 on the first valve core 4 and the third oil hole B3 on the housing, and between the sixth oil hole B6 on the first valve core 4 and the fourth oil hole B4 on the housing. This allows communication between the first oil chamber A1 and the hydraulic pump's outlet high pressure (i.e., communication with the hydraulic pump's oil pressure chamber C), with the pressure in the first oil chamber A1 being the same as the outlet high pressure. When the hydraulic pump's outlet high pressure is low, the hydraulic pressure generated by the high pressure fails to overcome the spring force of the elastic member. Consequently, the third oil hole B3 connects to the fifth oil hole B5, and the fourth oil hole B4 connects to the sixth oil hole B6. This creates two oil pathways: ① hydraulic pump outlet high pressure → first oil chamber A1 → fifth oil hole B5 → third oil hole B3 → hydraulic pump return chamber D; and ② hydraulic pump outlet high pressure → first oil chamber A1 → first oil hole B1 → second oil chamber A2 → sixth oil hole B6 → fourth oil hole B4 → hydraulic pump return chamber D. This maintains a relatively high warm flow rate even when the hydraulic pump's outlet high pressure is low.

[0032] When the hydraulic pump's high outlet pressure is high, the hydraulic pressure generated by the high outlet pressure overcomes the spring force of the elastic member. At this point, the first valve core 4 is in operation, the fifth oil hole B5 is disconnected from the third oil hole B3, and the sixth oil hole B6 remains connected to the fourth oil hole B4. This forms a single oil path: ① hydraulic pump's high outlet pressure → first oil chamber A1 → first oil hole B1 → second oil chamber A2 → sixth oil hole B6 → fourth oil hole B4 → hydraulic pump's return chamber D. This prevents excessive flow from occurring when the hydraulic pump's high outlet pressure is high, potentially placing excessive power load on the hydraulic system and affecting its efficiency. This could also prevent excessive internal temperature rise in the hydraulic pump due to excessive thermal flow, potentially leading to pump failure.

[0033] Therefore, the present application utilizes a temperature flow valve mechanism in the first chamber of the hydraulic pump for design, so as to adjust and control the flow rate of the high-pressure oil flowing from the hydraulic pump outlet to the oil return chamber D of the hydraulic pump.

[0034] Furthermore, the first valve core 4 includes a first oil hole B1, a fifth oil hole B5, a sixth oil hole B6, a first oil chamber A1, and a second oil chamber A2. To ensure the stability of the first valve core 4, the fifth oil hole B5 and the sixth oil hole B6 are radially spaced evenly, with at least two holes. The first oil hole B1 is axially centered and connects to the first oil chamber A1 and the second oil chamber A2.

[0035] Furthermore, a third oil chamber A3 is formed between the rear portion of the sidewall of the first valve core 4 and the inner cavity of the housing. This third oil chamber A3 communicates with the second oil chamber A2 and the hydraulic pump's oil return chamber D via the sixth oil hole B6 and the fourth oil hole B4, respectively, thereby establishing a second oil passage. In this application, the compression spring is housed in this third oil chamber A3, thereby providing elastic contact against the first valve core 4.

[0036] In some embodiments, the diameter of the fifth oil hole B5 is smaller than the diameter of the third oil hole B3 , and the diameter of the first oil hole B1 is smaller than the diameter of the fourth oil hole B4 and the diameter of the sixth oil hole B6 .

[0037] In this embodiment, since the first oil hole B1 and the fifth oil hole B5 are the main oil holes for controlling the temperature flow rate, the diameter of the fifth oil hole B5 should be smaller than the diameter of the third oil hole B3, and the diameter of the first oil hole B1 is smaller than the diameter of the fourth oil hole B4 and the diameter of the sixth oil hole B6. Through the above-mentioned size setting, the flow control effect of the oil of the temperature flow valve mechanism can be better.

[0038] In some embodiments, the shell includes a first valve sleeve 1 and a screw plug 7, the screw plug 7 is threadedly arranged at the rear end of the first valve sleeve 1, the interior of the first valve sleeve 1 and the screw plug 7 together constitute the inner cavity of the shell, the second oil hole B2 is arranged in the middle of the front end surface of the first valve sleeve 1, and a boss is formed at one end of the first valve core 4 facing the first valve sleeve 1, and the first valve core 4 slides in contact with the inner cavity of the shell through the boss, one end of the first elastic member 5 abuts against the end surface of the inner cavity of the shell where the bottom of the screw plug 7 is located, and the other end of the first elastic member 5 abuts against the end surface of the boss facing the screw plug 7.

[0039] In this embodiment, the housing can be a first valve sleeve 1 and a screw plug 7. The space between the first valve sleeve 1 and the left end of the first valve core 4 forms the hydraulic pump's oil pressure chamber C, while the space between the first valve sleeve 1 and the sidewall of the first chamber forms the hydraulic pump's oil return chamber D. A compression spring applies force to the right end of the first valve core 4. To position the compression spring, the first valve core 4 includes a boss at the center of the spring 16 to locate the compression spring's inner diameter. A spring mounting hole is also included between the first valve sleeve 1 and the screw plug 7 to locate the compression spring's outer diameter.

[0040] In some embodiments, the outer wall of the screw plug 7 is provided with a connecting thread for threaded connection with the threaded hole of the first cavity of the hydraulic pump and a first sealing ring 6 for sealing with the end surface of the first cavity;

[0041] The outer side wall of the first valve sleeve 1 is provided with a second sealing ring 2 and a protective ring 3 for sealing with the end face of the first cavity. The return oil chamber 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 toward the side where the return oil chamber D of the hydraulic pump is located, and the second sealing ring 2 is arranged away from the side where the return oil chamber D of the hydraulic pump is located.

[0042] In this embodiment, the above-described structure ensures that the first valve sleeve 1 is connected to the high-pressure outlet of the hydraulic pump (i.e., communicates with the hydraulic pump's oil pressure chamber C). To maintain tightness, a second sealing ring 2 and a protective ring 3 are provided. Protective ring 3 is located on the side facing away from the high-pressure outlet. In this application, protective ring 3 can be configured as a retaining spring to prevent loosening between the first valve sleeve 1 and the inner wall of the first chamber. A first sealing ring 6 is also provided to ensure low-pressure communication between the screw plug 7 and the hydraulic pump's oil return chamber D. In this application, the aforementioned sealing rings are preferably made of rubber.

[0043] In some embodiments, an annular oil groove is provided on the inner wall of the inner cavity of the housing, located inside the front end surface of the first valve sleeve 1. In this embodiment, through this arrangement, when the first valve core 4 moves rightward under the action of hydraulic pressure to overcome the spring force, the provision of the annular oil groove can increase the oil storage space of the hydraulic pump's oil pressure chamber C, thereby correspondingly reducing the impact force on the first valve core 4, thereby increasing the service life of the first valve core 4.

[0044] In some embodiments, as Figure 2 and Figure 3 As shown, 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 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 surface of the second cavity, and 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 connected to the return oil chamber D of the hydraulic pump, and a fourth oil chamber A4 is formed on the inner side of the filter element 12. The oil filter plug 20 is threadedly arranged at the rear end of the valve assembly, and 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, 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 12.

[0045] 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 resistance portion and a resistance portion. The second valve sleeve 15 contacts the conical spring 19 and the oil filter plug 20 respectively through the resistance portion. The second valve sleeve 15 is clamped with the filter element 12 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 15. The rear part of the side wall of the resistance portion is located on the side where the conical spring 19 is located and is uniformly opened in the circumferential direction with at least two seventh oil holes B7; at least two eighth oil holes B8 are uniformly formed on the side wall of the connecting portion along the circumferential direction; the through holes are respectively connected to the seventh oil hole B7 and the eighth oil hole B8; the eighth oil hole B8 is connected to 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 against the inner side wall of the through hole of the abutting portion according to a preset elastic force; the other end of the spring 16 abuts against the valve plug 13;

[0046] A flow passage is formed between the oil filter 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.

[0047] In this embodiment, the warm flow filtration 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 plug 20. A third oil chamber A3 is formed between the outer side of the filter element 12 and the sidewall of the second chamber. This third oil chamber A3 communicates with the hydraulic pump's return oil chamber D. A fourth oil chamber A4 is formed within the filter element 12. Oil entering the hydraulic pump's return oil chamber D from the warm flow valve mechanism passes through the third oil chamber A3, is filtered by the filter element 12, and then enters the fourth oil chamber A4, achieving clean filtration of the oil.

[0048] Furthermore, in order to prevent the oil filter from being used up or becoming blocked due to other reasons, resulting in the failure of the warm flow function, a valve assembly is provided inside the filter element 12. Its 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 conical 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 to 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 conical surface of the second valve core 17, and the eighth oil hole B8 on the side of the second valve sleeve 15, thereby continuing to realize the warm flow function.

[0049] Furthermore, in order to achieve the positioning of the spring 16 , a boss is provided on the valve plug 13 and the second valve core 17 at one end close to the spring 16 to achieve the inner diameter positioning of the spring 16 .

[0050] Furthermore, in order to prevent the valve plug 13 and the second valve sleeve 15 from loosening, an elastic cylindrical pin 14 is provided to achieve fastening between the two.

[0051] Furthermore, to prevent oil cross-flow, a sealing ring 11 is included between the filter element 12 and the sidewall of the second chamber. To prevent oil leakage, an eighth sealing ring 18 is provided between the oil filter plug 20 and the sidewall of the second chamber to prevent oil from leaking into the fourth oil chamber A4 through the flow channel formed between the oil filter plug 20 and the filter element 12. A groove for accommodating the third sealing ring is recessed on the outer surface of the contact portion of the second valve sleeve 15, so that the outer wall of the second valve sleeve 15 is provided with a third sealing ring for sealing with the inner end face of the filter element 12.

[0052] Furthermore, in order to prevent the filter element 12 from moving under a vibration 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 .

[0053] In some embodiments, as Figure 2 As shown, it also includes a temperature-flow pressure difference alarm mechanism fixedly arranged in the third chamber of the hydraulic pump, and the temperature-flow pressure difference alarm mechanism includes an oil filter indicator 8. The outer wall of the oil filter indicator 8 is provided with a connecting thread for threaded connection with the threaded hole of the third chamber and a fourth sealing ring 9 and a fifth sealing ring 10 for sealing with the end face of the third chamber. One end of the oil filter indicator 8 and the outer wall of the third chamber form a fifth oil chamber A5. The fifth oil chamber A5 is located between the fourth sealing ring 9 and the fifth sealing ring 10, and the fifth oil chamber A5 is connected to the return oil chamber D of the hydraulic pump. A sixth oil chamber A6 is formed between the right end of the oil filter indicator 8 and the side wall of the third chamber. The second chamber is located at the front end of the filter element 12 and is formed with a ninth oil hole B9. The sixth oil chamber A6 is connected to the fourth oil chamber A4 through the ninth oil hole B9.

[0054] 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. A sixth oil chamber A6 is formed between the right end of the oil filter indicator 8 and the side wall of the third chamber, and the sixth oil chamber A6 is connected to the fourth oil chamber A4 via the ninth oil hole B9. A fifth oil chamber A5 is formed between one end of the oil filter indicator 8 and the outer wall of the third chamber, and the fifth oil chamber A5 is located between the fourth sealing ring 9 and the fifth sealing ring 10, and the fifth oil chamber A5 is connected to the return oil chamber D of the hydraulic pump. If the filter element 12 has too much filter resistance, it will cause a pressure difference alarm between the return oil chamber D of the hydraulic pump and the fourth oil chamber A4, thereby alarming the status of the oil filter element 12. The oil filter indicator 8 can be mechanical, magnetic, electrical, or composite.

[0055] 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.

[0056] Furthermore, in order to prevent false alarms from the temperature flow pressure difference alarm mechanism, the flow capacity and filtration resistance of the filter element 12 should be reasonably set in combination with the flow rate of the temperature flow valve mechanism to avoid false alarms.

[0057] In some embodiments, as 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 to 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 to 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 circumferentially provided with an eleventh oil hole. The eleventh oil hole is connected to the inlet of the hydraulic pump through the fourth cavity. 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.

[0058] Furthermore, the outer 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;

[0059] 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. The inlet of the hydraulic pump is located between the sixth sealing ring 27 and the seventh sealing ring 22 .

[0060] In this embodiment, the warm-flow check mechanism comprises a third valve sleeve 21, a steel ball 23, a second spring 24, a seat for the steel ball 23, a retaining ring 26, and a second plug 28. The third valve sleeve 21 and the steel ball 23 form a sealing surface, which is compressed by the second spring 24. If the oil pressure in the ninth oil hole B9 is sufficient to overcome the elastic force of the second spring 24, the sealing surface opens, and the ninth oil hole B9 communicates with the hydraulic pump inlet E, achieving the final warm-flow circulation.

[0061] 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.

[0062] 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 .

[0063] 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.

[0064] In summary, the present invention achieves a warm flow function for a hydraulic pump through a warm flow valve mechanism, a warm flow filter mechanism, a warm flow differential pressure alarm mechanism, and a warm flow check mechanism. This warm flow device circulates oil from the hydraulic pump's high-pressure outlet (the hydraulic oil pressure chamber) to the hydraulic return chamber to the hydraulic pump's inlet, while also providing functions such as oil filtration, contamination warning, and backflow prevention. This enhances the ability of aircraft-borne hydraulic pump equipment to cope with low-temperature operating conditions, such as high altitude and extreme cold, significantly improving mission reliability. Furthermore, the device boasts a compact design, fully adapting to the trend toward smaller and lighter hydraulic pumps. Furthermore, the integrated constant power regulation system allows for manual adjustment using a small number of parts, reducing the machining precision requirements. This device offers strong applicability, excellent economical efficiency, and broad market prospects.

[0065] 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 invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0066] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A warm flow device used in a hydraulic pump, characterized in that: include: A temperature flow valve mechanism is fixedly arranged in a first volume chamber of a hydraulic pump, the temperature flow valve mechanism comprising a housing, a first valve core and a first elastic member, the first valve core being arranged in an inner chamber of the housing so as to be movable forward and backward, the first elastic member being used to elastically push the first valve core forward against the inner side of the front end surface of the housing according to a preset elastic force, a first oil chamber and a second oil chamber being sequentially arranged in the first valve core, the first oil chamber and the second oil chamber being connected via a first oil through hole, a second oil through hole being provided in the middle of the front end surface of the housing, the first oil chamber and the oil pressure chamber of the hydraulic pump being connected via the second oil through hole, The side wall of the housing is sequentially provided with a third oil hole and a fourth oil hole, both of which are connected to the oil return chamber of the hydraulic pump. At least two fifth oil holes are uniformly formed in the circumference of the side wall of the first valve core, which is located on the side where the first oil chamber is located. At least two sixth oil holes are uniformly formed in the circumference of the side wall of the first valve core, which is located on the side where the second oil chamber is located. A third oil chamber is formed between the rear portion of the side wall of the first valve core and the inner cavity of the housing. The third oil chamber is connected to the second oil chamber and the oil return chamber of the hydraulic pump through the sixth oil hole and the fourth oil hole, respectively. Among them, when the outer wall of the first valve core is in a natural state, the fifth oil hole is connected to the third oil hole, and the sixth oil hole is connected to the fourth oil hole; or, when the outer wall of the first valve core is in a working state, the fifth oil hole is not connected to the third oil hole, and the sixth oil hole is connected to the fourth oil hole.

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

3. The warm flow device used in a hydraulic pump according to claim 1, characterized in that: The housing includes a first valve sleeve and a screw plug, the screw plug is threadedly arranged at the rear end of the first valve sleeve, the interior of the first valve sleeve and the screw plug together constitute the inner cavity of the housing, the second oil hole is arranged in the middle of the front end surface of the first valve sleeve, a boss is formed at one end of the first valve core facing the first valve sleeve, the first valve core slides in contact with the inner cavity of the housing through the boss, one end of the first elastic member abuts against the end surface of the inner cavity of the housing where the bottom of the screw plug is located, and the other end of the first elastic member abuts against the end surface of the boss facing the screw plug.

4. The warm flow device used in a hydraulic pump according to claim 3, characterized in that: The outer side wall of the screw plug is provided with a connecting thread for threaded connection with the threaded hole of the first cavity of the hydraulic pump and a first sealing ring for sealing with the end surface 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 cooperating and sealing with the end face of the first cavity. The return oil chamber 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 return oil chamber of the hydraulic pump is located, and the second sealing ring is arranged away from the side where the return oil chamber of the hydraulic pump is located.

5. The warm flow device used in a hydraulic pump according to claim 3, characterized in that: 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.

6. The warm flow device used in a hydraulic pump according to claim 1, characterized in that: It also includes a warm flow filtering mechanism fixedly arranged in the second volume chamber 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 volume chamber, a third oil chamber is formed between the outer side of the filter element and the second volume chamber, the third oil chamber is connected to the return oil chamber of the hydraulic pump, a fourth oil chamber 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 chamber, 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.

7. The warm flow device used in a hydraulic pump according to claim 6, characterized in that: 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 contacts the conical spring and the oil filter plug respectively 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. 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 circumference of at least two third sealing rings. Seven oil holes, at least two eighth oil holes are evenly opened on the side wall of the connecting portion along the circumferential direction, the through holes are respectively connected to the seventh oil hole and the eighth oil hole, and the eighth oil hole is connected to the fourth oil chamber, the valve plug is fixedly located in the through hole of the sleeve 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 push the second valve core backward to 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 plug and the filter element, and the third oil chamber and the seventh oil hole are communicated with each other through the flow channel.

8. The warm flow device used in a hydraulic pump according to claim 6, characterized in that: It also includes a temperature-flow pressure difference alarm mechanism fixedly arranged in the third chamber of the hydraulic pump, the temperature-flow pressure difference alarm mechanism includes an oil filter indicator, the outer wall of the oil filter indicator is provided with a connecting thread for threaded connection with the threaded hole of the third chamber and a fourth sealing ring and a fifth sealing ring for sealing with the end face of the third chamber, one end of the oil filter indicator and the outer wall of the third chamber form a fifth oil chamber, the fifth oil chamber is located between the fourth sealing ring and the fifth sealing ring, and the fifth oil chamber is connected to the return oil 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 chamber, the second chamber is located at the front end of the filter element and is formed with a ninth oil hole, the sixth oil chamber is connected with the fourth oil chamber through the ninth oil hole.

9. The warm flow device used in a hydraulic pump according to claim 8, characterized in that: The hydraulic pump further includes a warm flow check mechanism fixedly disposed in a fourth chamber of the hydraulic pump. The warm flow check mechanism includes a third valve sleeve, a steel ball, a second spring, a steel ball seat, a retaining ring, and a second screw plug. The second screw plug is screwed to the rear end of the third valve sleeve. The interiors of the third valve sleeve and the second screw plug together form a second inner chamber. A tenth oil hole is provided in the middle portion of the front end surface of the third valve sleeve. The second inner chamber communicates with the ninth oil hole via the tenth oil hole. The second inner chamber is located in the third valve sleeve and has a second boss formed at one end thereof facing the tenth oil hole. The second spring is configured 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 circumferentially formed with an eleventh oil hole between the second boss and the steel ball seat. The eleventh oil hole communicates with the inlet of the hydraulic pump via the fourth chamber. The third valve sleeve is further provided with a retaining ring groove on the inner side. The retaining ring is accommodated in the retaining ring groove to limit the steel ball seat.

10. The warm flow device used in a hydraulic pump according to claim 9, characterized in that: The outer wall of the second screw plug is provided with a connecting thread for threaded connection with the threaded hole of the fourth cavity and a sixth sealing ring for sealing with the end surface of the fourth cavity; The outer side wall of the third valve sleeve is provided with a seventh sealing ring for cooperating and sealing with the end surface of the fourth cavity, and the inlet of the hydraulic pump is located between the sixth sealing ring and the seventh sealing ring.

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