A bimetallic side plate sealing structure for a high-pressure gear pump

Abstract

The utility model relates to a bimetallic side plate sealing structure for a high-pressure gear pump. Through holes are provided on both sides of the center of the "8"-shaped side plate. A low-pressure unloading groove, a high-pressure unloading groove and a high-pressure area oil guide groove are provided on the front of the side plate. The low-pressure unloading groove connects the two through holes. The high-pressure unloading groove is a square structure and communicates with the oil outlet chamber of the rear cover body shell. A "3"-shaped back pressure groove is provided on the back of the side plate. The back pressure groove is a strip groove. An ear-shaped baffle and an ear-shaped sealing ring are provided in the groove to form a closed cavity, which divides the oil pump into two areas of high pressure and low pressure. The side plate of the utility model designs the oil outlet high-pressure chamber into a structure that matches the oil outlet chamber of the rear cover body shell, so as to avoid the situation that the hydraulic oil is easy to form a vortex and damage the side plate due to the low structural matching rate, thereby improving the service life of the gear pump. The device adopts a 3-shaped strip back pressure groove, which has a simple structure and is easy to process, low cost and high production efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of gear pump accessories, in particular to a bimetallic side plate sealing structure for a high-pressure gear pump. Background Art

[0002] In the existing structure of the gear pump, the driving gear and the driven gear are meshed with each other, and there is a pump body seal in the radial direction. Two "8"-shaped side plate seals are installed on the two end faces of the gear, which together with the shell form an independent oil inlet low-pressure chamber and oil outlet high-pressure chamber. The high-pressure chamber side of the "8"-shaped side plate is connected to the shell oil outlet chamber, and the low-pressure chamber of the side plate is connected to the shell oil inlet chamber. The front of the side plate is provided with a cat-ear-shaped high-pressure unloading groove and a square-groove-shaped low-pressure unloading groove, and the back of the side plate is provided with a "3"-shaped oil groove, which is covered with a rubber sealing ring and a sealing retaining ring of the same shape to form an axial floating compensation area, which is balanced with the high-pressure area on the front of the side plate. In the past, due to the limitation of equipment capacity, the shape of the side plate high-pressure chamber was usually designed to be very simple, without considering the impact on hydraulic flow, resulting in the local oil being prone to form vortex resistance when the gear pump is working, increasing the precipitation of gas mixed in the oil, and then causing the occurrence of oil pump cavitation.

[0003] To this end, the present application designs a bimetallic side plate sealing structure for a high-pressure gear pump to solve the above problems. Summary of the invention

[0004] In order to make up for the deficiencies in the prior art, the utility model provides a bimetallic side plate sealing structure for a high-pressure gear pump.

[0005] A bimetallic side plate sealing structure for a high-pressure gear pump, comprising an "8"-shaped side plate, characterized in that:

[0006] The center of the "8"-shaped side plate is provided with through holes on both sides, and a low-pressure unloading groove, a high-pressure unloading groove and a high-pressure area oil guide groove are opened on the front of the side plate. The low-pressure unloading groove connects the two through holes, and the high-pressure unloading groove is a square structure and communicates with the oil outlet cavity of the rear cover body shell. A "3"-shaped back-pressure groove is provided on the back of the side plate. The back-pressure groove is a strip-shaped groove, and an ear-shaped baffle and an ear-shaped sealing ring are provided in the groove to form a closed cavity, which divides the oil pump into two areas of high pressure and low pressure.

[0007] Furthermore, in order to better realize the utility model, the through hole is used for the gear shaft to pass through the side plate, the diameter of the through hole is 1.5 to 5 mm larger than the outer diameter of the gear shaft, and the two through holes are designed as a concentric structure with the outer circle of the "8"-shaped side plate.

[0008] Furthermore, in order to better implement the present utility model, the low-pressure unloading groove may also be connected to the oil inlet chamber of the housing.

[0009] Furthermore, in order to better realize the utility model, the back pressure groove and the outer circle of the "8"-shaped side plate are designed as a concentric structure.

[0010] Furthermore, in order to better realize the utility model, the ear-shaped baffle is installed between the back pressure groove and the middle support rib of the ear-shaped sealing ring, and its cross-section is a right-angled trapezoidal cross-section. The end of the ear-shaped baffle facing the outer side of the side plate is a right angle, and the end facing the ear-shaped sealing ring is an acute angle. Its trapezoidal bevel cooperates with the bevel of the baffle support of the ear-shaped sealing ring.

[0011] Furthermore, in order to better implement the present invention, the ear-shaped baffle is made of nylon, plastic, polytetrafluoroethylene or similar plastic.

[0012] Furthermore, in order to better realize the utility model, the ear-shaped sealing ring includes a trapezoidal sealing head, a middle support rib, an inner support rib and a retaining ring support rib. The middle cross-section of the ear-shaped sealing ring is in an "⊥" shape as a whole. When installed, the upper end of the middle support rib of the ear-shaped sealing ring faces the side away from the side plate, and the transverse "I"-shaped cross-section formed by the lower ends of the inner support rib, the retaining ring support rib and the middle support rib faces the bottom surface of the back pressure groove, forming an interference fit with the back pressure groove.

[0013] Furthermore, in order to better realize the present utility model, the material of the ear-shaped sealing ring is rubber or rubber-like; the inner supporting rib is a continuous strip structure or a circular boss structure; trapezoidal sealing heads are arranged at the high and low pressure sealing matching positions of the two ends of the ear-shaped sealing ring and the rear cover body shell and the side plate, and the trapezoidal sealing heads can also be designed as a square structure.

[0014] The beneficial effects of the utility model are:

[0015] The side plate of the utility model is designed to have a structure that matches the oil outlet cavity of the rear cover body shell, so as to avoid the situation that the hydraulic oil is easy to form a vortex and damage the side plate due to the low structural matching rate, thereby improving the service life of the gear pump. The device adopts a 3-shaped strip back pressure groove, which has a simple structure, is easy to process, has low cost and high production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is the main view of the existing side panel;

[0017] Figure 2 It is a rear view of the existing side panel;

[0018] Figure 3 It is a structural diagram of the existing rear cover shell;

[0019] Figure 4 It is a schematic diagram of assembling the existing side panel and the rear cover shell;

[0020] Figure 5It is a front view of the side panel of the utility model;

[0021] Figure 6 It is a rear view of the side panel of the utility model;

[0022] Figure 7 It is a schematic diagram of the assembly of the side plate and the rear cover shell of the utility model;

[0023] Figure 8 This is a schematic diagram of the ear-shaped baffle structure of the utility model;

[0024] Fig. 9 for Figure 8 AA section view;

[0025] Fig.10 This is a schematic diagram of the ear-shaped sealing ring structure of the utility model;

[0026] Fig.11 for Fig.10 BB section view;

[0027] Fig.12 It is a schematic diagram of the installation combination of the ear-shaped sealing ring and the ear-shaped baffle of the utility model;

[0028] Fig.13 It is a schematic diagram of another ear-shaped sealing ring structure.

[0029] In the figure,

[0030] 1: oil inlet low-pressure chamber, 2: low-pressure unloading groove, 3: high-pressure unloading groove, 4: oil outlet high-pressure chamber, 5: high-pressure area oil guide groove, 6: through hole, 7: back pressure groove, 8: ear-shaped baffle, 801: trapezoidal bevel, 802: right-angled trapezoidal section, 9: ear-shaped sealing ring, 901: trapezoidal sealing head, 902: middle support rib, 903: inner support rib, 904: retaining ring support rib, 905: retaining ring support bevel, 10: rear cover shell, 11: shell oil outlet chamber. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only some embodiments of the utility model, not all embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the utility model provided in the accompanying drawings is not intended to limit the scope of the utility model claimed for protection, but merely represents selected embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0033] Figure 1-Figure 4 For the existing side plate structure, the shape of the side plate oil outlet high-pressure chamber is usually designed to be very simple, without considering the impact on the hydraulic flow. Since the side plate oil outlet high-pressure chamber structure does not match the shell oil outlet chamber structure of the rear cover body, when the gear pump is working, local oil is prone to form vortex resistance, which increases the precipitation of gas mixed in the oil, and further causes cavitation of the oil pump.

[0034] Figure 5-Figure 12 A specific embodiment of the utility model is a bimetallic side plate sealing structure for a high-pressure gear pump, such as Figure 5 Figure 6 Figure 7 As shown, the side plate is in an "8-shaped" structure as a whole, with two through holes 6 in the middle. The two through holes 6 are used for the gear shaft to pass through the side plate. The diameter of the two through holes 6 is generally 1.5 to 5 mm larger than the outer circle of the gear shaft. The two through holes 6 and the "8"-shaped outer circle of the side plate are designed as a concentric structure; the front of the side plate is provided with a high-pressure unloading groove 3, a low-pressure unloading groove 2, and a high-pressure area oil guide groove 5, wherein the high-pressure unloading groove 3 can be designed as a square structure and communicated with the oil outlet chamber 11 of the housing, and the low-pressure unloading groove 2 can be connected to the two through holes 6 at the same time, and can also be connected to the oil inlet chamber of the housing when necessary. On the back of the side plate, a "3"-shaped back-pressure groove 7 is provided. The "3"-shaped back-pressure groove 7 and the "8"-shaped outer circle are designed as a concentric structure. The back-pressure groove 7 is a strip structure. An ear-shaped baffle 8 and an ear-shaped sealing ring 9 are provided in the groove to form a closed cavity, which divides the oil pump into two areas of high pressure and low pressure. One side of the high-pressure area is a sealing boundary composed of a sealing ring and a baffle, and the other side is a shell, which together constitute a high-pressure compensation area.

[0035] like Figure 8 Fig. 9 Fig.12 As shown, the ear-shaped baffle 8 can be made of nylon, plastic, polytetrafluoroethylene or similar plastics. The ear-shaped baffle 8 is installed between the "3"-shaped back pressure groove 7 of the side plate and the middle support rib 902 of the ear-shaped sealing ring 9, and its cross section is a right-angle trapezoidal structure design. Among them, the end facing the outer side of the side plate is a right angle, and the end facing the ear-shaped seal is an acute angle. The trapezoidal bevel 801 cooperates with the bevel 905 of the baffle support of the ear-shaped sealing ring 9, which ensures that the ear-shaped baffle 8 has excellent assembly and disassembly process characteristics.

[0036] like Fig.10 Fig.11As shown, the ear-shaped sealing ring 9 is installed in the "3"-shaped back pressure groove 7 of the side plate, and is made of rubber or rubber-like material, has certain elasticity, strength and compression deformation characteristics, and its cross-section is a special-shaped structure design, and its structure includes inner support ribs 903, middle support ribs 902, retaining ring support ribs 904 and trapezoidal sealing head 901, and the middle cross-section is in a "⊥" shape as a whole. When installed, the upper end of the middle support rib 902 of the ear-shaped retaining ring 9 faces away from the side plate, and the inner support ribs 903, the retaining ring support ribs 904 and the middle support ribs 90 The transverse "I"-shaped cross section formed at the lower end of the side plate faces the bottom surface of the "3"-shaped back pressure groove 7 of the side plate, and forms an interference fit with the "3"-shaped back pressure groove 7 of the side plate to ensure that it will not fall off when the side plate is installed after assembly. The internal support rib 902 can be a continuous strip structure or a circular boss structure; the two ends of the ear-shaped sealing ring 9 are provided with a trapezoidal sealing head 901 with a reinforced structure at the position of the high and low pressure sealing of the side plate, which increases the sealing length in both the axial and radial directions, so that the sealing in the middle of the side plate is more reliable.

[0037] like Fig.13 As shown, the trapezoidal sealing heads 901 at both ends of the ear-shaped sealing ring 9 can also be designed as a square structure.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the utility model by ordinary technicians in this field should be included in the scope of the claims of the utility model as long as they do not depart from the spirit and scope of the technical solution of the utility model.

Claims

1. A bimetallic side plate sealing structure for a high-pressure gear pump, comprising an "8"-shaped side plate, characterized in that: Through holes (6) are provided on both sides of the center of the "8"-shaped side plate. A low-pressure unloading groove (2), a high-pressure unloading groove (3) and a high-pressure area oil guide groove (5) are provided on the front side of the side plate. The low-pressure unloading groove (2) is connected to the two through holes (6). The high-pressure unloading groove (3) is a square structure and is connected to the shell oil outlet cavity (11) of the rear cover shell (10). A "3"-shaped back pressure groove (7) is provided on the back side of the side plate. The back pressure groove (7) is a strip-shaped groove. An ear-shaped baffle (8) and an ear-shaped sealing ring (9) are provided in the groove to form a closed cavity, which divides the oil pump into two areas of high pressure and low pressure.

2. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 1, characterized in that: The through hole (6) is used for the gear shaft to pass through the side plate. The diameter of the through hole (6) is 1.5 to 5 mm larger than the outer diameter of the gear shaft. The two through holes (6) are designed to be concentric with the outer circle of the "8"-shaped side plate.

3. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 1, characterized in that: The low-pressure unloading groove (2) may also be in communication with the oil inlet chamber of the housing.

4. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 1, characterized in that: The back pressure groove (7) and the outer circle of the "8"-shaped side plate are designed to be concentric in structure.

5. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 1, characterized in that: The ear-shaped baffle (8) is installed between the back pressure groove (7) and the middle support rib (902) of the ear-shaped sealing ring (9), and its cross section is a right-angled trapezoidal cross section (802). The end of the ear-shaped baffle (8) facing the outer side of the side plate is a right angle, and the end facing the ear-shaped sealing ring (9) is an acute angle. The trapezoidal bevel (801) of the ear-shaped baffle (8) matches the bevel (905) of the baffle support of the ear-shaped sealing ring (9).

6. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 5, characterized in that: The ear-shaped baffle (8) is made of nylon, plastic, polytetrafluoroethylene or a similar plastic.

7. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 1, characterized in that: The ear-shaped sealing ring (9) comprises a trapezoidal sealing head (901), a middle supporting rib (902), an inner supporting rib (903) and a retaining ring supporting rib (904); the middle cross section of the ear-shaped sealing ring (9) is in an overall "⊥" shape; when installed, the upper end of the middle supporting rib (902) of the ear-shaped sealing ring (9) faces the side away from the side plate; the transverse "I"-shaped cross section formed by the lower ends of the inner supporting rib (903), the retaining ring supporting rib (904) and the middle supporting rib (902) faces the bottom surface of the back pressure groove (7) and forms an interference fit with the back pressure groove (7).

8. The bimetallic side plate sealing structure for a high-pressure gear pump according to claim 7, characterized in that: The material of the ear-shaped sealing ring (9) is rubber or rubber-like; the inner supporting rib (903) is a continuous strip structure or a circular boss structure; trapezoidal sealing heads (901) are arranged at the high and low pressure sealing matching positions of the two ends of the ear-shaped sealing ring (9) and the rear cover shell (10) and the side plate; the trapezoidal sealing heads (901) can also be designed as a square structure.

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