A hydraulic pump control valve sleeve with optimized structure

Abstract

The present invention discloses a structurally optimized hydraulic pump control valve sleeve, comprising a pump body formed with a valve cavity, a pressure regulating mechanism installed in the cavity opening of the pump body valve cavity, a two-piece valve sleeve disposed in the valve cavity, the two-piece valve sleeve comprising a first valve sleeve that slides with the valve cavity and a second valve sleeve screwed onto the upper end of the first valve sleeve, the upper end of the second valve sleeve abutting the pressure regulating mechanism; a valve core disposed in the first valve sleeve, the upper end of the valve core abutting the bottom surface of the second valve sleeve; a push rod hole formed in the valve core, a push rod installed in the push rod hole, the upper end of the push rod abutting the bottom of the push rod hole, and the lower end of the push rod abutting the bottom surface of the pump body valve cavity. The present invention is easy to manufacture, has high machining precision, is convenient to install, and can effectively improve the performance of the entire pump.

Description

Technical Field

[0001] The present invention relates to the technical field of hydraulic pumps, in particular to a hydraulic pump control valve sleeve with an optimized structure. Background Art

[0002] Currently, some parts of the control valves within traditional hydraulic pumps are difficult to machine, making it difficult to meet the dimensional and geometric tolerances specified in the drawings, which in turn significantly impacts the performance of the entire pump. Therefore, it is necessary to optimize and improve the structure of the control valve sleeves within traditional hydraulic pumps to reduce machining difficulty, increase inspection efficiency, and enhance overall pump performance. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a hydraulic pump control valve sleeve with an optimized structure in response to the status quo of the above-mentioned prior art, which is conducive to improving the processing accuracy of the inner hole and reducing the difficulty of detection and internal deburring.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] A structurally optimized hydraulic pump control valve sleeve comprises a pump body with a valve cavity formed therein, a pressure regulating mechanism installed in the cavity opening of the valve cavity of the pump body, a double-body valve sleeve provided in the valve cavity, the double-body valve sleeve comprising a first valve sleeve slidingly engaged with the valve cavity and a second valve sleeve spirally mounted on the upper end of the first valve sleeve, the upper end of the second valve sleeve being in contact with the pressure regulating mechanism; a valve core is provided in the first valve sleeve, the upper end of the valve core being in contact with the bottom surface of the second valve sleeve; a push rod hole is formed in the valve core, a push rod is installed in the push rod hole, the upper end of the push rod is in contact with the bottom of the push rod hole, and the lower end of the push rod is in contact with the bottom surface of the valve cavity of the pump body.

[0006] To optimize the above technical solutions, specific measures taken also include:

[0007] The above-mentioned first valve sleeve is axially and transparently formed with a valve hole, which consists of a threaded hole with a thread at the upper end and a valve core hole connected to the threaded hole; a radial oil hole for connecting to the valve core hole is formed on the circumferential surface of the first valve sleeve, and an annular oil groove is formed by expanding the diameter of the upper end of the radial oil hole in the valve core hole.

[0008] An upper sealing boss for slidingly sealing with the valve cavity is formed on the outer peripheral surface of the upper end of the above-mentioned first valve sleeve, and a lower sealing boss for slidingly sealing with the valve cavity is formed on the outer peripheral surface of the lower end of the first valve sleeve, and two control edges for slidingly sealing with the valve cavity are formed on the outer peripheral surface of the middle part of the first valve sleeve; lubricating oil grooves for storing oil are formed on both the upper sealing boss and the lower sealing boss.

[0009] A lower annular concave area is formed between the above-mentioned control edge and the lower sealing boss. The lower annular concave area cooperates with the valve cavity to form a circular gap oil channel. The radial oil hole is located in the lower annular concave area, and a high-pressure oil port connected to the gap oil channel is formed in the valve cavity.

[0010] The above-mentioned second valve sleeve is spirally installed in the threaded hole of the first valve sleeve, and the valve core is slidably arranged in the valve core hole of the first valve sleeve; the second valve sleeve is processed with an external thread for spirally matching with the threaded hole of the first valve sleeve, and the second valve sleeve is formed with a positioning step for positioning and matching with the orifice of the threaded hole; an oil drain channel is axially passed through the second valve sleeve.

[0011] A limiting hole is formed on the bottom surface of the valve cavity, and the lower end of the push rod is inserted into the limiting hole.

[0012] The above-mentioned pressure regulating mechanism consists of an adjusting seat, an adjusting screw, a preload spring, a spring seat and a locking nut; the adjusting seat is spirally installed on the cavity mouth of the valve cavity, and the spring seat and the preload spring are both arranged in the spring cavity processed by the adjusting seat, and the spring cavity of the adjusting seat cooperates with the upper end of the second valve sleeve to form a low-pressure oil drain cavity; the lower end of the preload spring presses on the upper end of the second valve sleeve, and the upper end of the preload spring presses on the spring seat, and the lower end of the adjusting screw spirally passes through the adjusting screw hole of the adjusting seat and extends into the spring cavity of the adjusting seat and contacts with the spring seat, and the locking nut is spirally installed on the adjusting screw, and the bottom surface of the locking nut cooperates with the top surface of the adjusting seat in pressure.

[0013] The upper end spiral of the adjusting screw is equipped with a protective cap; an oil drain channel connected to the low-pressure oil drain chamber is processed in the valve cavity.

[0014] Compared to the prior art, the present invention incorporates a two-piece valve housing within the valve cavity of the pump body. This housing, assembled from a first and second valve housing, effectively reduces the machining difficulty of traditional single-piece valve housings, allowing the valve hole in the first housing to be formed as a through hole. This improves machining accuracy and reduces inspection and deburring difficulties. The upper end of the second housing in the two-piece valve housing is abutted against a pressure regulating mechanism, which adjusts the operating pressure of the two-piece valve housing to meet the pressure control requirements of the hydraulic pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Figure 2 This is a schematic diagram of the assembly of the double-body valve sleeve of the present invention;

[0017] Figure 3 is a cross-sectional structural diagram of the first valve sleeve of the present invention;

[0018] Figure 4It is a cross-sectional structural diagram of the second valve sleeve of the present invention. DETAILED DESCRIPTION

[0019] The embodiments of the present invention are described in further detail below with reference to the accompanying drawings.

[0020] Figures 1 to 4 It is a structural schematic diagram of the present invention.

[0021] The accompanying drawings are marked as follows: lubricating oil groove C, clearance oil channel D, high-pressure oil port K, low-pressure oil drain chamber X, pump body 1, valve chamber 1a, limiting hole 1b, oil drain channel 1c, first valve sleeve 2, threaded hole 2a, valve core hole 2b, radial oil hole 2c, annular oil groove 2d, upper sealing boss 21, lower sealing boss 22, control edge 23, annular concave area 24, second valve sleeve 3, oil drain channel 3a, external thread 31, positioning step 32, valve core 4, push rod hole 4a, push rod 5, pressure regulating mechanism 6, adjusting seat 61, adjusting screw 62, preload spring 63, spring seat 64, locking nut 65, protective cap 7.

[0022] The present invention discloses a hydraulic pump control valve sleeve with optimized structure, comprising a pump body 1 with a valve cavity 1a formed therein. Figure 1 As shown, a pressure regulating mechanism 6 is spirally installed in the cavity of the valve cavity 1a. A two-body valve sleeve is provided in the valve cavity 1a, and the two-body valve sleeve is composed of a first valve sleeve 2 and a second valve sleeve 3. The traditional control valve sleeve is a single valve sleeve, which is too difficult to process. The size and shape tolerances are difficult to meet the requirements of the drawings, which easily affects the performance of the entire pump. The present invention changes the traditional single valve sleeve into a two-body valve sleeve, which can effectively reduce the processing difficulty of the product. Figure 3As shown, the first valve sleeve 2 is formed with a valve hole formed axially and transparently. The valve hole consists of a threaded hole 2a with a thread at the upper end and a valve core hole 2b connected to the threaded hole 2a. Designing the valve hole as a through hole improves machining accuracy and reduces the difficulty of inspection and deburring. A radial oil hole 2c is formed on the outer circumference of the first valve sleeve 2, connecting to the valve core hole 2b. An annular oil groove 2d is formed in the valve core hole 2b at the upper end of the radial oil hole 2c. An upper sealing boss 21 is formed on the outer circumference of the upper end of the first valve sleeve 2, which is designed to slide and seal with the inner wall of the valve cavity 1a. A lower sealing boss 22 is formed on the outer circumference of the lower end of the first valve sleeve 2, which is designed to slide and seal with the inner wall of the valve cavity 1a. Two control edges 23 are also formed on the outer circumference of the middle portion of the first valve sleeve 2, which are designed to slide and seal with the inner wall of the valve cavity 1a. The second valve sleeve 3 is screwed onto the upper end of the first valve sleeve 2, and its upper end abuts the pressure regulating mechanism 6. The pressure regulating mechanism 6 can helically adjust the preload pressure of the two-piece valve housing, thereby ensuring that the operating pressure of the two-piece valve housing meets the pump's operating requirements. A valve core 4 is provided within the first valve housing 2, the upper end of which abuts the bottom surface of the second valve housing 3. A push rod hole 4a is formed within the valve core 4, and a push rod 5 is mounted within this hole. The upper end of the push rod 5 abuts the bottom of the hole 4a, and the lower end of the push rod 5 abuts the bottom surface of the valve cavity of the pump body.

[0023] In the embodiment, in order to ensure smooth sliding of the first valve sleeve 2 , a lubricating oil groove C for storing oil is formed on both the upper sealing boss 21 and the lower sealing boss 22 of the first valve sleeve 2 .

[0024] In the embodiment Figure 2 As shown, a lower annular concave area 24 is formed between the lower of the two control edges 23 and the lower sealing boss 22. An upper annular concave area is formed between the upper of the two control edges 23 and the upper sealing boss 21. An intermediate annular concave area is formed between the two control edges 23. The lower annular concave area 24 cooperates with the valve cavity 1a to form a circular gap oil passage D. The radial oil hole 2c is located in the lower annular concave area 24. A high-pressure oil port K is formed in the valve cavity 1a and communicates with the gap oil passage D.

[0025] In the embodiment Figure 4 As shown, the second valve sleeve 3 is threadedly mounted in the threaded hole 2a of the first valve sleeve 2, and the valve core 4 is slidably disposed in the valve core hole 2b of the first valve sleeve 2. The second valve sleeve 3 is machined with external threads 31 for threaded engagement with the threaded hole 2a of the first valve sleeve 2, and is also formed with a positioning step 32 for alignment with the opening of the threaded hole 2a. An oil drain channel 3a is machined axially through the second valve sleeve 3. The oil drain channel 3a guides oil leaking from the valve core 4.

[0026] In the embodiment, in order to prevent the push rod 5 from deflecting, the present invention further forms a limiting hole 1b on the bottom surface of the valve cavity 1a, and the lower end of the push rod 5 is inserted into the limiting hole 1b.

[0027] In the embodiment, the pressure regulating mechanism 6 of the present invention comprises an adjusting seat 61, an adjusting screw 62, a preload spring 63, a spring seat 64, and a locking nut 65. The adjusting seat 61 is processed with an external thread and is screwed onto the cavity opening of the valve cavity 1a via its external thread. To prevent oil leakage, a sealing ring is press-fitted between the adjusting seat 61 and the cavity opening of the valve cavity 1a. The adjusting seat 61 is also coaxially processed with an adjusting screw hole and a spring cavity. The spring seat 64 and the preload spring 63 are both disposed in the spring cavity processed by the adjusting seat 61. The upper end of the second valve sleeve 3 extends into the spring cavity. The spring cavity cooperates with the upper end of the second valve sleeve 3 to form a low-pressure oil drain chamber X. The oil drain channel 3a is connected to the low-pressure oil drain chamber X. The lower end of the preload spring 63 presses against the upper end of the second valve sleeve 3, and the upper end of the preload spring 63 presses against the spring seat 64. The lower end of the adjusting screw 62 is threaded through the adjusting screw hole of the adjusting seat 61 and extends into the spring cavity of the adjusting seat 61, where it contacts the top surface of the spring seat 64. The locking nut 65 is screwed onto the adjusting screw 62, and the bottom surface of the locking nut 65 presses against the top surface of the adjusting seat 61, locking the adjusting screw 62 to prevent it from loosening.

[0028] In this embodiment, a protective cap 7 is screwed onto the upper end of the adjusting screw 62. An oil drain channel 1c is formed in the valve chamber 1a, connecting to the low-pressure oil drain chamber X. The protective cap 7 prevents damage to the adjusting screw 62, and the oil drain channel 1c directs any oil that leaks into the low-pressure oil drain chamber X to the oil return line.

[0029] This invention improves the traditional single-piece valve sleeve by replacing it with a two-piece sleeve. This reduces the machining difficulty of the sleeve, allowing the valve hole in the sleeve to be formed as a through hole. This improves the machining accuracy of the valve hole and reduces the difficulty of inspection and internal deburring. This invention facilitates installation, saves time, improves work efficiency, and significantly increases the qualification rate of the entire pump.

[0030] The best embodiment of the present invention has been described, and various changes or modifications can be made by those skilled in the art without departing from the scope of the present invention.

Claims

1. A hydraulic pump control valve sleeve with an optimized structure, comprising a pump body (1) having a valve cavity (1a) formed therein, wherein a pressure regulating mechanism (6) is installed in the cavity opening of the valve cavity (1a), and wherein: The valve cavity (1a) is provided with a double-body valve sleeve, and the double-body valve sleeve comprises a first valve sleeve (2) that is slidably matched with the valve cavity (1a) and a second valve sleeve (3) that is screwed on the upper end of the first valve sleeve (2), and the upper end of the second valve sleeve (3) is in contact with the pressure regulating mechanism (6); the first valve sleeve (2) is provided with a valve core (4), and the upper end of the valve core (4) is in contact with the bottom surface of the second valve sleeve (3); the valve core (4) is formed with a push rod hole (4a), and a push rod (5) is installed in the push rod hole (4a), the upper end of the push rod (5) is in contact with the bottom of the push rod hole (4a), and the lower end of the push rod (5) is in contact with the bottom surface of the valve cavity of the pump body; The first valve sleeve (2) is formed with a valve hole in an axially transparent manner, and the valve hole is composed of a threaded hole (2a) with a thread at the upper end and a valve core hole (2b) connected to the threaded hole (2a); a radial oil hole (2c) for communicating with the valve core hole (2b) is formed on the circumferential surface of the first valve sleeve (2); and an annular oil groove (2d) is formed in the valve core hole (2b) at the upper end of the radial oil hole (2c) by expanding the diameter; An upper sealing boss (21) for slidingly sealingly cooperating with the valve cavity (1a) is formed on the outer peripheral surface of the upper end of the first valve sleeve (2), a lower sealing boss (22) for slidingly sealingly cooperating with the valve cavity (1a) is formed on the outer peripheral surface of the lower end of the first valve sleeve (2), and two control edges (23) for slidingly sealingly cooperating with the valve cavity (1a) are formed on the outer peripheral surface of the middle portion of the first valve sleeve (2); a lubricating oil groove (C) for storing oil is formed on both the upper sealing boss (21) and the lower sealing boss (22); A lower annular concave area (24) is formed between the control edge (23) and the lower sealing boss (22), and the lower annular concave area (24) cooperates with the valve cavity (1a) to form a circular gap oil passage (D). The radial oil hole (2c) is located in the lower annular concave area (24), and a high-pressure oil port (K) connected to the gap oil passage (D) is formed in the valve cavity (1a); A limiting hole (1b) is formed on the bottom surface of the valve cavity (1a), and the lower end of the push rod (5) is inserted into the limiting hole (1b).

2. The structurally optimized hydraulic pump control valve sleeve according to claim 1, characterized in that: The pressure regulating mechanism (6) is composed of an adjusting seat (61), an adjusting screw (62), a preload spring (63), a spring seat (64) and a locking nut (65); the adjusting seat (61) is screw-mounted on the cavity opening of the valve cavity (1a); the spring seat (64) and the preload spring (63) are both arranged in a spring cavity machined in the adjusting seat (61); the spring cavity of the adjusting seat (61) cooperates with the upper end of the second valve sleeve (3) to form a low-pressure oil drain cavity (X) The lower end of the preload spring (63) is pressed against the upper end of the second valve sleeve (3), and the upper end of the preload spring (63) is pressed against the spring seat (64). The lower end of the adjusting screw (62) is spirally passed through the adjusting screw hole of the adjusting seat (61) and extends into the spring cavity of the adjusting seat (61) and contacts the spring seat (64). The locking nut (65) is spirally installed on the adjusting screw (62), and the bottom surface of the locking nut (65) is pressed against the top surface of the adjusting seat (61).

3. The structurally optimized hydraulic pump control valve sleeve according to claim 2, characterized in that: The upper end of the adjusting screw (62) is spirally provided with a protective cap (7); and an oil drain channel (1c) communicating with the low-pressure oil drain chamber (X) is machined in the valve cavity (1a).

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