CN212003467U - Water medium swash plate axial piston pump with pressure protection - Google Patents

Abstract

The utility model belongs to the technical field of fluid transmission and control equipment, and relates to a water medium swash plate type axial piston pump with pressure protection. The outer end face of the blue is fastened to the front cover plate, and the other end of the casing is fixed to the rear end cover; the main shaft is rotatably arranged on the water inlet and outlet flanges and the front cover plate, and the shaft diameter of the main shaft extending into the casing is matched to the cylinder block. In the inner hole of the cylinder body, the inner hole of the cylinder body is provided with a main spring corresponding to the end of the main shaft, the end face of the inner hole of the cylinder body is matched with a ball hinge, the main spring is pressed on the ball hinge, and the ball hinge is matched to connect the return disc, A plunger is arranged on the outer ring of the cylinder body corresponding to the inner hole, and the return plate and the plunger press the sliding shoe against the first inclined surface of the swash plate. The plunger pump can reduce the output flow of the pump when the pressure is too high, and play a protective role in the various parts of the pump body.

Description

Water medium swash plate axial piston pump with pressure protection

technical field

The utility model belongs to the technical field of fluid transmission and control equipment, and relates to a water medium swash plate type axial plunger pump with pressure protection.

Background technique

In the 20th century, a green transmission technology that uses water (including seawater and fresh water) as the working medium is a cutting-edge research direction in the field of fluid transmission and control in the world. The seawater hydraulic transmission technology directly using seawater as the working medium has become the development direction of the power drive system of the underwater operation equipment in the world today, and has been proved as the best power drive method by the practical application of the western developed countries for many years. The inevitable choice of equipment power drive mode.

The water hydraulic pump is the core power component of the hydraulic transmission system. For many years, Western countries have listed it as a high-tech project with important engineering application value, and developed a series of mature water hydraulic pump products. And the products currently put into the market are mainly based on the axial plunger structure. In recent years, major universities such as Huazhong University of Science and Technology and Zhejiang University in China have gradually carried out research work on hydraulic transmission and control, and gradually developed several prototypes of hydraulic axial piston pumps.

At present, the water medium axial piston pump on the market is mainly a quantitative pump. The system is generally equipped with a safety valve. When the system pressure is too high, the safety valve is opened to overflow, so as to realize the control of the system pressure. The following disadvantages exist:

1) During the operation of the safety valve, the pump is still running at full power;

2) The power consumption is very large, and the system heats up quickly;

3) Increase unnecessary wear of the pump;

4) If the safety valve is stuck, it will cause damage to the water pump and other parts.

SUMMARY OF THE INVENTION

In view of the above problems, the utility model provides a swash plate axial piston pump with pressure protection water medium, which can reduce the output flow of the pump when the pressure is too high, and play the role of the various parts of the pump body. to protection.

According to the technical scheme of the present utility model: a water medium swash plate axial piston pump with pressure protection, which is characterized in that it comprises a casing, and one axial end of the casing is sealed and connected to the inlet and outlet flanges, and the inlet and outlet flanges The outer end face is fastened to the front cover, and the other end of the housing is fixed to the rear cover;

The main shaft is rotatably arranged on the water inlet and outlet flanges and the front cover. The shaft diameter of the main shaft extending into the casing is matched and connected to the inner hole of the cylinder body. The inner hole of the cylinder body is provided with a main spring corresponding to the end of the main shaft. The end face of the inner hole of the cylinder body is matched with a spherical hinge, the main spring is pressed on the spherical hinge, and the spherical hinge is matched to connect the return disc. The outer ring of the cylinder body corresponding to the inner hole is provided with a plunger. The plug presses the sliding shoe against the first inclined surface of the swash plate, a rotating steel ball is arranged between the second inclined surface of the swash plate and the contact surface of the rear end cover, and the swash plate is also provided with a third inclined surface, and the third inclined surface extends to The outer end of the second inclined plane forms an obtuse angle with the second inclined plane;

A control valve assembly is arranged on the water inlet and outlet flanges, and the control valve assembly includes a valve housing. The valve housing is provided with a high-pressure water port and a control water port. The valve housing is provided with a control mechanism to control the connection or disconnection between the high-pressure water port and the control water port. , the control nozzle is communicated with one end of the flow channel on the casing, and the other end of the flow channel extends to the position of the support on the rear end cover, the support can move axially relative to the rear end cover, and the support is connected to the rear end cover. A support spring is arranged between the end covers; the high-pressure water port is communicated with the water pump outlet provided on the inlet and outlet flanges.

As a further improvement of the present invention, the control mechanism includes a nut connected to the axial hole of the valve housing, a screw plug is also arranged in the axial hole of the valve housing, and a variable valve is arranged between the screw plug and the nut The core, the inner hole of the nut is provided with a spring seat and a spring, the spring and the spring seat are tightly connected, the other end of the spring is pressed against the axial end of the variable valve core, and the other axial end of the variable valve core passes through the end of the screw plug The through hole is pressed against the control steel ball arranged outside the screw plug, the steel ball is used to adjust the opening and closing of the control nozzle, and there is a moving gap between the variable valve core and the axial end of the nut.

As a further improvement of the present invention, the core body of the variable valve core is provided with a limit flange, the core body of the variable valve core corresponding to the side of the limit flange extends into the nut, and the variable valve core corresponds to the limiter flange. The end of the core body on the other side of the flange is provided with an axially extending portion, and the axially extending portion passes through the end through hole of the screw plug.

As a further improvement of the present invention, the water inlet and outlet flanges are fixed to the distribution plate corresponding to one end face of the casing, and the cylinder body is provided with a floating plate corresponding to one end face of the distribution plate.

As a further improvement of the present utility model, semicircular ball sockets are respectively provided on the second inclined surface of the rear end cover and the swash plate, and rotating steel balls are arranged in the ball sockets on which the rear end cover and the second inclined surface of the swash plate cooperate with each other. .

The technical effect of the utility model is: when the utility model is in operation, when the system pressure is too high, the water pump first changes its own swash plate angle, reduces the output flow of the pump, protects the various parts of the system, and at the same time cooperates with the system safety valve. double protection. It is embodied in the following aspects: 1. The pump body is provided with a control valve assembly, which can respectively control the opening of high pressure/low pressure at the bottom of the support according to the pump outlet pressure; This controls the swing speed of the swash plate and avoids the impact during the swing of the variable-angle swash plate; 3. The bottom of the variable-angle swash plate is supported by two steel balls and a support, and can move along the two sides under the action of the support. The axis of the steel ball swings.

Description of drawings

Figure 1 is a cross-sectional view of the utility model.

FIG. 2 is a schematic structural diagram of a pressure control valve assembly.

FIG. 3 is a schematic diagram of the structure of the swash plate.

Fig. 4 is a bottom view of the swash plate.

Figure 5 is a side view of the swash plate.

FIG. 6 is a schematic diagram of the utility model.

Detailed ways

The specific embodiments of the present utility model will be further described below with reference to the accompanying drawings.

In Figures 1 to 6, it includes the main shaft 1, the front cover 2, the inlet and outlet flanges 3, the high pressure nozzle 3-1, the control nozzle 3-2, the shell 4, the distribution plate 5, the floating plate 6, the cylinder block 7, the column Plug 8, sliding shoe 9, return disc 10, ball hinge 11, rear end cover 12, bearing spring 13, bearing 14, swash plate 15, first slope 15-1, second slope 15-2, third slope 15-3, ball socket 15-4, swash plate variable axis 15-5, pressure control valve assembly 16, valve housing 17, control steel ball 18, screw plug 19, variable valve core 20, spring 21, spring seat 22, Nut 23, locking nut 24, adjusting screw 25, etc.

As shown in Figures 1 to 6, the present utility model is a water medium swash plate axial piston pump with pressure protection, comprising a casing 4, and one axial end of the casing 4 is sealed and connected to the inlet and outlet flanges 3, and the inlet and outlet The outer end surface of the water flange 3 is fastened to the front cover plate 2 , and the rear end cover 12 is fixed to the other end of the housing 4 in the axial direction.

The main shaft 1 is rotatably arranged on the water inlet and outlet flanges 3 and the front cover plate 2. The shaft diameter of the main shaft 1 extending into the casing 4 is matched and connected to the inner hole of the cylinder block 7. The inner hole of the cylinder block 7 corresponds to The end of the main shaft 1 is provided with a main spring, and the end face of the inner hole of the cylinder block 7 is matched with a ball hinge 11. The main spring is pressed against the ball hinge 11, and the ball hinge 11 is matched with the return plate 10. The outer ring of the hole is provided with a plunger 8. The return plate 10 and the plunger 8 press the sliding shoe 9 against the first slope 15-1 of the swash plate 15, and the second slope 15-2 of the swash plate 15 and A rotating steel ball is arranged between the contact surfaces of the rear end cover 12, and the swash plate 15 is also provided with a third inclined surface 15-3. The third inclined surface 15-3 extends from the outer end of the second inclined surface 15-2 and is connected to the second inclined surface. An obtuse angle is formed between 15-2, and a swash plate changing axis 15-5 is formed between the third inclined surface 15-3 and the second inclined surface 15-2.

The water inlet and outlet flanges 3 are provided with a control valve assembly 16. The control valve assembly 16 includes a valve housing 17. The valve housing 17 is provided with a high pressure water port 3-1 and a control water port 3-2. The valve housing 17 is provided with a control mechanism In order to control the connection or disconnection of the high-pressure water port 3-1 and the control water port 3-2, the control water port 3-2 is communicated with one end of the flow channel on the housing 4, and the other end of the flow channel extends to the rear end cover 12. At the position of the support 14, the support 14 can move axially relative to the rear end cover 12, and a support spring 13 is arranged between the support 14 and the rear end cover 12; The set pump outlet is connected.

The control mechanism includes a nut 23 connected to the axial hole of the valve housing 17 , a screw plug 19 is also arranged in the axial hole of the valve housing 17 , and a variable valve core 20 is arranged between the screw plug 19 and the nut 23 . A spring seat 22 and a spring 21 are arranged in the inner hole of the cap 23. The spring 21 and the spring seat 22 are tightly connected. The through hole at the end of the screw plug 19 is pressed against the control steel ball 18 provided outside the screw plug 19. The steel ball 18 is used to adjust the opening and closing of the control nozzle 3-2. The variable valve core 20 and the nut 23 There is a moving gap between the axial ends of the .

The core body of the variable valve core 20 is provided with a limit flange, the core body of the variable valve core 20 corresponding to one side of the limit flange extends into the nut 23, and the variable valve core 20 corresponds to the other side of the limit flange The end of the core body is provided with an axial extension, and the axial extension passes through the end through hole of the screw plug 19 .

The inlet and outlet flanges 3 are fixed to the distribution plate 5 corresponding to one end face of the casing 4 , and the cylinder block 7 is provided with a floating plate 6 corresponding to the end face of the distribution plate 5 .

The rear end cover 12 and the second inclined surface 15-2 of the swash plate 15 are respectively provided with semicircular ball sockets 15-4. 4. Set the rotating steel ball.

The working process of the product of the utility model is as follows: the main shaft 1 is driven to rotate, thereby driving the cylinder block 7 to rotate, the cylinder block 7 drives the plunger 8, the sliding shoe 9, the return disk 10, and the floating disk 6 to rotate, and the sliding shoe 9 is in the center spring. Under the joint action of the ball hinge 11 and the return plate 10, it is in close contact with the variable displacement swash plate 15 to make a rotary motion, thereby realizing the reciprocating motion of the plunger 8 relative to the cylinder body 7, and realizing the suction and drainage process of the water pump.

When the outlet pressure of the water pump is lower than the set pressure of the control valve assembly 16, the control steel ball 18 in the control valve assembly 16 is pressed against the left conical surface of the valve housing 17 under the action of the spring 21. The control oil port is connected with the low pressure chamber 3-3, that is, the bottom of the support 14 is low pressure, the angle of the swash plate of the water pump is α, and the water pump works normally.

When the outlet pressure of the water pump is higher than the set pressure of the control valve assembly 16, the control steel ball 18 in the control valve assembly 16 overcomes the action of the spring 21 under the action of high pressure water, so that the control steel ball is pressed against the conical surface of the screw plug 19, At this time, the control nozzle is closed with the low-pressure chamber 3-3 and communicated with the high-pressure nozzle, that is, the bottom of the support 14 is under high pressure. The steel ball in -4 is the fulcrum, swinging along the axis of the swash plate movement to the position where the small plane and the back end cover 12 of the water pump fit together. At this time, the angle of the water pump swash plate becomes (α-β), and the water pump switches to a small displacement. The output flow of the pump at this displacement is only used to make up for system leakage to maintain the pressure required by the pump variable, and the output power is almost zero. In this way, the protection of the pump and other parts of the system is achieved.

Claims (5)

1. The utility model provides a take pressure protection aqueous medium swash plate formula axial plunger pump which characterized in that: the water inlet and outlet device comprises a shell (4), wherein one axial end of the shell (4) is hermetically connected with a water inlet and outlet flange (3), the outer end face of the water inlet and outlet flange (3) is fixedly connected with a front cover plate (2), and the other axial end of the shell (4) is fixedly provided with a rear end cover (12);

the main shaft (1) is rotatably arranged on the water inlet and outlet flange (3) and the front cover plate (2), the main shaft (1) extends into a shell (4) and is connected with an inner hole of a cylinder body (7) in a shaft diameter matching way, a main spring is arranged in the inner hole of the cylinder body (7) corresponding to the end part of the main shaft (1), a spherical hinge (11) is arranged on the end surface of the inner hole of the cylinder body (7) in a matching way, the main spring is tightly pressed on the spherical hinge (11), the spherical hinge (11) is connected with a return disc (10) in a matching way, a plunger (8) is arranged on the cylinder body (7) corresponding to the outer ring of the inner hole, the return disc (10) and the plunger (8) tightly press a sliding shoe (9) on a first inclined plane (15-1) of a swash plate (15), a rotary steel ball is arranged between a second inclined plane (15-2) of the swash plate (15) and a contact surface of a, the third inclined plane (15-3) extends to the outer end of the second inclined plane (15-2) and forms an obtuse angle with the second inclined plane (15-2);

the water inlet and outlet flange (3) is provided with a control valve assembly (16), the control valve assembly (16) comprises a valve shell (17), the valve shell (17) is provided with a high-pressure water port (3-1) and a control water port (3-2), the valve shell (17) is provided with a control mechanism for controlling the connection or disconnection of the high-pressure water port (3-1) and the control water port (3-2), the control water port (3-2) is communicated with one end of a flow channel on the shell (4), the other end of the flow channel extends to the position of a support (14) on the rear end cover (12), the support (14) can axially move relative to the rear end cover (12), and a support spring (13) is arranged between the support (14) and the rear end cover (12); the high-pressure water port (3-1) is communicated with a water pump outlet arranged on the water inlet and outlet flange (3).

2. The pressure protected aqueous medium swash plate axial piston pump of claim 1, wherein: the control mechanism comprises a nut (23) connected in an axial hole of the valve shell (17), a plug (19) is further arranged in the axial hole of the valve shell (17), a variable valve core (20) is arranged between the plug (19) and the nut (23), a spring seat (22) and a spring (21) are arranged in the inner hole of the nut (23), the spring (21) is fixedly connected with the spring seat (22), the other end of the spring (21) is tightly propped against one axial end of the variable valve core (20), the other axial end of the variable valve core (20) penetrates through a through hole at the end part of the plug (19) and is tightly propped against a control steel ball (18) arranged on the outer side of the plug (19), the steel ball (18) is used for adjusting the opening and closing of the control water gap (3-2), and a moving gap is formed between the axial end parts of the variable valve.

3. The pressure protected aqueous medium swash plate axial piston pump of claim 2, wherein: the variable valve core (20) is characterized in that a limiting flange is arranged on a core body of the variable valve core (20), the core body of one side, corresponding to the limiting flange, of the variable valve core (20) extends into the nut (23), an axial extending portion is arranged at the end portion, corresponding to the core body of the other side of the limiting flange, of the variable valve core (20), and the axial extending portion penetrates through a through hole in the end portion of the plug (19).

4. The pressure protected aqueous medium swash plate axial piston pump of claim 1, wherein: the water inlet and outlet flange (3) is corresponding to one side end face of the shell (4) and is fixedly provided with a flow distribution plate (5), and the cylinder body (7) is corresponding to one side end face of the flow distribution plate (5) and is provided with a floating plate (6).

5. The pressure protected aqueous medium swash plate axial piston pump of claim 1, wherein: the rear end cover (12) and the second inclined plane (15-2) of the swash plate (15) are respectively provided with a semicircular ball socket (15-4), and a rotary steel ball is arranged in the ball socket (15-4) in which the rear end cover (12) and the second inclined plane (15-2) of the swash plate (15) are mutually matched.

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