A variable volume pump body and its application

Abstract

A variable volumetric pump body includes a stator housing and a rotor. The rotor and stator housing cooperate to form an annular sealed cavity. The rotor includes a rotor disk and a piston fixedly connected to the rotor disk. The piston is located within the annular sealed cavity, and the cross-sectional shape of the piston matches the cross-sectional shape of the annular sealed cavity, allowing it to slide within the cavity. A valve is also mounted on the stator housing. When closed, the valve isolates the annular sealed cavity; when open, it connects the annular sealed cavity. The invention also relates to an application of the variable volumetric pump body as a fluid pump, where a motor drives the rotor to rotate and compresses low-pressure fluid into high-pressure fluid for output. Furthermore, it relates to an application of the variable volumetric pump body as a motor, where high-pressure fluid drives a piston in a circular motion, which in turn drives the rotor to rotate. This invention features low energy consumption, stable output, and strong versatility, belonging to the field of fluid machinery equipment.

Description

Technical Field

[0001] The invention relates to fluid mechanical equipment, and in particular to a variable displacement pump body and application thereof. Background Art

[0002] There are many types of fluid displacement pumps and motors used in fluid transmission on the market. They are different in structure and working principle, energy efficiency, stability at different speeds, processing difficulty and cost. At the same time, the interchangeability between displacement pumps and motors is not flexible and is not suitable for all types. Different types of pumps or motors must be selected according to different application scenarios, which makes selection difficult. Therefore, in order to meet the needs of market production rules, there must be a large number of different types of inventory products at the same time, which wastes a lot of material resources and also causes cost increases.

[0003] The fluid displacement pumps and motors currently on the market are roughly divided into two categories according to their extrusion volume change movement mode: indirect linear reciprocating and direct rotary. Indirect linear reciprocating means that the rotational mechanical energy of the source motor is converted into the linear reciprocating motion of the piston in the cylinder through a conversion mechanism, thereby squeezing the fluid and generating the fluid pressure energy, or converting the generated fluid pressure energy into mechanical rotational energy through the linear reciprocating motion of the backlog piston or the fluid pressure through the linear reciprocating motion of the extruding piston, and through the conversion mechanism. Representative examples include plunger pumps and motors. Indirect linear reciprocating energy consumption is relatively large. In the process of converting rotational mechanical energy into linear reciprocating motion, energy consumption will be generated. At the same time, the reciprocating motion of the piston will generate secondary energy consumption under the action of inertia. The addition of the conversion mechanism makes the structure complex and increases the difficulty of processing. In addition, the processing accuracy requirements are also high, which increases the cost. Direct rotation type means that the rotational mechanical energy of the source motor is directly squeezed into the cylinder body to generate fluid pressure energy, or the fluid pressure energy is changed by changing the volume of the pump body to generate rotational mechanical energy. Representative types include screw pumps, diaphragm pumps, gear pumps, vane pumps, gear motors, vane motors, etc. The effect of screw pumps in converting into motors is not ideal, so there are few applications in this area. The screw machining accuracy requirements are high, which increases the cost. The possibility of diaphragm pumps in converting into motors is zero, and the output pulsation is large. The gear pump has large pulsation at low speed and small displacement. When used as a motor, the low-speed output is not stable and pulsating. The torque is small, and the gear machining accuracy requirements are also high. The vane pump has large output pulsation at low speed. At high speed, the expansion and contraction of the blades under the action of centrifugal force will generate energy consumption. When used as a motor, the low-speed output is not stable and pulsating, and the machining accuracy requirements of the blades and the blade expansion cavity are high.

[0004] To sum up the above, there is no positive displacement pump on the market that is freely interchangeable between pumps and motors, suitable for most application scenarios, has a relatively simple structure, is easy to process, has relatively low processing precision requirements, has stable output, is relatively energy efficient, and is reasonably priced. This is not conducive to reducing the types of application products, reducing inventory, facilitating mass production, improving productivity, reducing costs, and saving material resources. Summary of the invention

[0005] In view of the technical problems existing in the prior art, the purpose of the present invention is to provide a variable displacement pump body with high energy efficiency and stable output and application thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] A variable displacement pump body comprises a stator housing and a rotor. The rotor cooperates with the stator housing to form an annular sealed cavity. The rotor comprises a rotor disc and a piston fixedly connected to the rotor disc. The piston is located in the annular sealed cavity. The cross-sectional shape of the piston matches the cross-sectional shape of the annular sealed cavity and slides in the annular sealed cavity.

[0008] The stator housing is also provided with a valve, which isolates the annular sealing cavity when closed and connects the annular sealing cavity when opened.

[0009] Along the direction of piston movement, the annular sealing area between the piston and the valve closest to the rear side forms a first variable volume chamber, and the annular sealing area between the piston and the valve closest to the front side forms a second variable volume chamber.

[0010] The number of pistons is n, the number of valves is at least n+1, the pistons are evenly distributed along the ring on the rotor disk, and the valves are evenly distributed along the ring on the stator housing at positions corresponding to the annular sealing chamber, forming n first variable-volume chambers and n second variable-volume chambers, where n is an integer not less than 1.

[0011] The rotor is also provided with a first fluid inlet connected to the first variable volume cavity and external input fluid, and a first fluid outlet connected to the second variable volume cavity and external output fluid.

[0012] With this structure, the piston does not perform conventional reciprocating motion but continuous circular motion. It has stable output, low energy consumption, and strong versatility. It can be used as a fluid pump as well as a motor.

[0013] As a preferred embodiment, the variable displacement pump further includes an annular inlet confluence chamber and an annular outlet confluence chamber, both of which are formed by the cooperation of the rotor disc and the stator housing; the inlet confluence chamber is connected to the first fluid inlet and is provided with a second fluid inlet connected to the external input fluid, and the second fluid inlet is provided on the stator housing; the outlet confluence chamber is connected to the first fluid outlet and is provided with a second fluid outlet connected to the external output fluid, and the second fluid outlet is provided on the stator housing. With this structure, fluid input or output passes through the confluence chamber, which reduces impact and runs more smoothly.

[0014] As a preferred embodiment, the stator housing includes a cylinder housing, a front cylinder head, a rear cylinder head, and bolts. The cylinder housing is annular and its inner diameter is larger than the outer diameter of the rotor disc. The cylinder housing is sleeved on the outer circumference of the rotor disc. The front cylinder head and the rear cylinder head are respectively installed on both sides of the rotor disc. The annular area between the rotor disc, the cylinder housing, the front cylinder head and the rear cylinder head forms an annular sealed cavity. The bolts penetrate and fix the cylinder housing, the front cylinder head and the rear cylinder head. The rear cylinder head is also provided with an axial hole. The center of the rotor disc is provided with an axis passing through the axial hole. Two annular first grooves are provided on both sides of the rotor disc, and a connecting hole is provided between the two first grooves. The front cylinder head, the rear cylinder head and the two second grooves cooperate to form an inlet confluence cavity. Two annular second grooves are provided on both sides of the rotor disc, and a connecting hole is provided between the two second grooves. The front cylinder head, the rear cylinder head and the two second grooves cooperate to form an outlet confluence cavity. After adopting this structure, the first groove and the second groove are both opened on both sides of the rotor disc, so that under the action of the fluid pressure, the two sides of the rotor are subjected to equal pressure from the fluid.

[0015] As a preferred embodiment, along the forward direction of the piston, the first fluid inlet is arranged on the rear side of the piston, connected to the inlet confluence chamber through the inlet flow channel, which is a channel that runs through the piston and connects to the inlet confluence chamber; the first fluid outlet is arranged on the front side of the piston, connected to the outlet confluence chamber through the outlet flow channel, which is a channel that runs through the piston and connects to the outlet confluence chamber. After adopting this structure, the area in front of the piston is always connected to the fluid outlet, and the area behind the piston is always connected to the fluid inlet, so that the piston can make continuous circular motion, and the inlet flow channel and outlet flow channel opened on the piston are conducive to the heat dissipation of the piston.

[0016] As a preferred embodiment, the rotor disc is provided with pressure relief grooves, which are two grooves located on the front and rear sides of the piston, and are located in the annular sealing cavity. With this structure, the fluid pressure in the two adjacent annular sealing cavities before and after the valve can be made consistent, reducing the friction between the valve and the cylinder housing when the valve is opened, while reducing the fluctuation of the fluid pressure in the annular sealing cavity, and the output is more stable.

[0017] As a preferred embodiment, the valve is a gate valve, including a shell, a valve plate, a reset spring, and a three-way ball valve. The valve plate is T-shaped, including a head and a protrusion. The shell is arranged on the stator shell, and a cavity opening toward the center of the stator shell is provided in the shell. The head of the valve plate can be slidably installed in the cavity up and down. A mounting port matching the protrusion is provided on the stator shell, and the protrusion is inserted into the annular sealing cavity from the mounting port, so that the opening below the cavity is closed by the stator shell and the protrusion of the valve plate. Through holes penetrating the head from top to bottom are provided at both ends of the head of the valve plate, and the reset spring is installed between the top of the cavity and the head of the valve plate. The three-way ball valve includes a valve body, which includes a front channel, an intermediate channel and a rear channel. A valve core that can block the front channel or the rear channel is also provided in the valve body. The intermediate channel is connected to the top of the cavity, and the front channel and the rear channel are respectively connected to the annular sealing cavity on the front and rear sides of the valve. The valve core is spherical, and the position of the valve core includes two positions, namely, a first position at the port of the front channel and a second position at the port of the rear channel. The position of the valve is controlled by the pressure difference between the front and rear sides of the annular sealing cavity and moved to a position with lower pressure. After adopting this structure, under the action of fluid pressure, the valve core in the three-way ball valve is pushed toward the low-pressure side of the front and rear sides of the annular sealing cavity, so that the two sides are separated, and the high-pressure fluid squeezes the upper section of the valve plate to prevent the lower section from leaking due to wear. The high-pressure fluid acts on the lower section of the valve plate and overcomes the pressure of the reset spring to cause the valve plate to open by mistake.

[0018] As a preferred embodiment, the above-mentioned variable displacement pump body also includes an intermittent motion mechanism that drives the valve to open and close. The intermittent motion mechanism includes a rotating wheel, on which a cam groove is provided. The cam groove is a cam-shaped groove. The intermittent motion mechanism is connected to the valve through an ejector pin. The ejector pin is a rod-shaped structure with a hook at one end. The hook is embedded in the cam groove. The other end of the ejector pin is connected to the valve, so that the rotation of the rotating wheel drives the ejector pin to push and pull along the radial direction of the rotor disc; the raised part of the cam groove corresponds to the position of the piston, so that when the piston passes through the valve, the ejector pin pushes outward along the radial direction of the rotor disc to drive the valve to open. After adopting this structure, the ejector pin and the cam groove are used in combination to avoid the contact between the valve plate and the piston, enhance the sealing performance of the valve plate to the annular sealing cavity, extend its service life, and facilitate the high-speed operation of the rotor.

[0019] As a preferred embodiment, the valve is a butterfly valve, including a housing and a butterfly-shaped valve plate. The housing is mounted on the stator housing, the valve plate is mounted in the housing, the middle of the valve plate is rotatably connected to the housing, one end of the valve plate is connected to the housing through a reset spring, and the other end of the valve plate is stuck in the annular sealing cavity under the tension of the reset spring; when the piston passes, the valve plate is pushed open, and after the piston passes, the valve plate is closed under the action of the reset spring. With this structure, the valve plate is opened by the driving force of the piston itself during movement, which can effectively simplify the overall structure of the pump body.

[0020] An application of a variable volume pump body, using the above variable volume pump body as a fluid pump, the input fluid is a low-pressure fluid, the output fluid is a high-pressure fluid, the rotor disc is connected to the motor input shaft, the motor drives the rotor disc to rotate and compresses the low-pressure fluid into a high-pressure fluid for output.

[0021] An application of a variable displacement pump body, using the above variable displacement pump body as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, the high-pressure fluid pushes the piston to make a circular motion and drives the rotor to rotate.

[0022] In general, the present invention has the following advantages: the present invention is mainly completed by the cooperation of a piston and an intermittently opened and closed valve, the overall structure is relatively simple, and its output is extremely stable regardless of high or low speed operation. At the same time, no conversion mechanism is required from input to output, energy consumption is lower, the pump and the motor can be freely interchangeable, the versatility is stronger, and it supports large and small power outputs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a stereoscopic diagram of a variable displacement pump body in the first embodiment.

[0024] Figure 2 This is a schematic diagram of the internal structure of a variable displacement pump body in Example 1.

[0025] Figure 3 It is a three-dimensional diagram of the rotor in the first embodiment.

[0026] Figure 4 It is a side view of the rotor in the first embodiment.

[0027] Figure 5 It is a three-dimensional diagram of the cylinder housing in the first embodiment.

[0028] Figure 6 It is a front view of the cylinder housing in the first embodiment.

[0029] Figure 7 It is a three-dimensional view of the front cylinder head in the first embodiment.

[0030] Figure 8 It is a side view of the front cylinder head in the first embodiment.

[0031] Fig. 9 It is a three-dimensional view of the rear cylinder cover in the first embodiment.

[0032] Fig.10 It is a side view of the rear cylinder cover in the first embodiment.

[0033] Fig.11 It is a three-dimensional diagram of a gate valve.

[0034] Fig.12 The side view of the gate valve.

[0035] Fig.13 It is a schematic diagram of the structure of the gate valve.

[0036] Fig.14 This is a schematic diagram of the structure of a butterfly valve.

[0037] Fig.15 It is a front view of the intermittent motion mechanism in the first embodiment.

[0038] Fig.16 It is a side view of the intermittent motion mechanism in the first embodiment.

[0039] Fig.17 It is a stereoscopic diagram of a variable displacement pump body in the second embodiment.

[0040] Fig.18 This is a schematic diagram of the internal structure of a variable displacement pump body in Example 2.

[0041] Fig.19 It is a three-dimensional diagram of the rotor in the second embodiment.

[0042] Fig. 20 It is a side view of the rotor in the second embodiment.

[0043] Fig.21 It is a front view of the intermittent motion mechanism in the second embodiment.

[0044] Fig. 22 It is a schematic structural diagram of a variable displacement pump body in Example 4.

[0045] Fig.23 It is a stereoscopic diagram of the rotor in the ninth embodiment.

[0046] Fig.24 It is a three-dimensional diagram of the cylinder housing in the ninth embodiment.

[0047] Fig.25 It is a three-dimensional view of the front cylinder head in the ninth embodiment.

[0048] Fig.26 It is a three-dimensional diagram of the rear cylinder head in the ninth embodiment.

[0049] Fig. 27 It is a side view of the rear cylinder head in the ninth embodiment.

[0050] Fig.28 Schematic diagram of the internal structure of a variable displacement pump body in Example 9.

[0051] Among them, 1 is the rotor disc, 2 is the piston, 3 is the cylinder housing, 4 is the front cylinder head, 5 is the rear cylinder head, 6 is the gate valve, 7 is the butterfly valve, and 8 is the cam mechanism

[0052] 101 is the first fluid inlet, 102 is the first fluid outlet, 103 is the inlet flow channel, 104 is the outlet flow channel, 105 is the first groove, 106 is the second groove, and 107 is the pressure relief groove

[0053] 301 is the installation port.

[0054] 401 is a second fluid inlet, and 402 is a second fluid outlet.

[0055] 501 is the shaft hole.

[0056] 601 is a housing, 602 is a valve plate, 603 is a three-way ball valve, 604 is a return spring, 605 is a ejector pin, and 606 is a valve core.

[0057] 701 is a housing, 702 is a valve plate, and 703 is a return spring.

[0058] 801 is a rotating wheel, and 802 is a cam groove. DETAILED DESCRIPTION

[0059] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0060] Embodiment 1

[0061] A variable displacement pump body comprises a stator housing and a rotor. The rotor cooperates with the stator housing to form an annular sealed cavity. The rotor comprises a rotor disc 1 and a piston 2 fixedly connected to the rotor disc. The piston is located in the annular sealed cavity. The cross-sectional shape of the piston matches the cross-sectional shape of the annular sealed cavity and slides in the annular sealed cavity.

[0062] The stator housing includes a cylinder housing 3, a front cylinder head 4, a rear cylinder head 5, and bolts. The cylinder housing is annular and its inner diameter is larger than the outer diameter of the rotor disc. The front cylinder head and the rear cylinder head are both circular cover plates with a hole in the middle. The cylinder housing is sleeved on the outer circumference of the rotor disc. The front cylinder head and the rear cylinder head are respectively installed on both sides of the rotor disc. The annular area between the rotor disc, the cylinder housing, the front cylinder head and the rear cylinder head forms an annular sealing chamber.

[0063] Bolts penetrate and fix the cylinder body shell, the front cylinder head and the rear cylinder head. The rear cylinder head is also provided with an axial hole, and the center of the rotor disc is equipped with an axis passing through the axial hole.

[0064] A valve is arranged on the stator housing, and the valve isolates the annular sealing cavity when it is closed, and connects the annular sealing cavity when it is opened.

[0065] The number of pistons is 1, the number of valves is 2, and the valves are evenly distributed along the ring at positions corresponding to the annular sealing chamber on the stator housing.

[0066] The valve is a gate valve 6, including a shell 601, a valve plate 602, a reset spring 604, and a three-way ball valve 603. The valve plate is T-shaped, including a head and a protrusion. The shell is arranged on the stator shell, and a cavity opening toward the center of the stator shell is arranged in the shell. The head of the valve plate can be slidably installed in the cavity up and down. A mounting port 301 matching the protrusion is opened on the stator shell, and the protrusion is inserted into the annular sealing cavity from the mounting port, so that the opening below the cavity is closed by the stator shell and the protrusion of the valve plate. Through holes penetrating the head from top to bottom are opened at both ends of the head of the valve plate, and the reset spring is installed between the top of the cavity and the head of the valve plate.

[0067] The three-way ball valve includes a valve body, which includes a front channel, a middle channel and a rear channel. A valve core 606 that can block the front channel or the rear channel is also provided in the valve body. The middle channel is connected to the top of the cavity, and the front channel and the rear channel are respectively connected to the annular sealing cavity on the front and rear sides of the valve. The valve core is spherical, and the position of the valve core includes two positions, namely a first position at the port of the front channel and a second position at the port of the rear channel. The position of the valve is controlled by the pressure difference between the front and rear sides of the annular sealing cavity and moved to a position with lower pressure.

[0068] Along the direction of piston movement, the annular sealing area between the piston and the valve closest to the rear side forms a first variable volume chamber, and the annular sealing area between the piston and the valve closest to the front side forms a second variable volume chamber, so that the annular sealing chamber includes a first variable volume chamber and a second variable volume chamber.

[0069] The rotor is also provided with a first fluid inlet 101 connecting the first variable volume chamber and the external input fluid, and a first fluid outlet 102 connecting the second variable volume chamber and the external output fluid. Along the forward direction of the piston, the first fluid inlet is arranged on the rear side of the piston, and the first fluid outlet is arranged on the front side of the piston.

[0070] Two annular first grooves 105 are provided on both sides of the rotor disc, a connecting hole is provided between the two first grooves, and the front cylinder head, the rear cylinder head and the two first grooves cooperate to form an inlet confluence chamber; two annular second grooves 106 are provided on both sides of the rotor disc, a connecting hole is provided between the two second grooves, and the front cylinder head, the rear cylinder head and the two second grooves cooperate to form an outlet confluence chamber.

[0071] The first fluid inlet is connected to the inlet confluence chamber through the inlet channel 103, which is a channel that passes through the piston and connects to the inlet confluence chamber; the first fluid outlet is connected to the outlet confluence chamber through the outlet channel 104, which is a channel that passes through the piston and connects to the outlet confluence chamber.

[0072] The inlet confluence chamber is connected to the first fluid inlet and is provided with a second fluid inlet 401 connected to the external input fluid, and the second fluid inlet is provided on the stator housing; the outlet confluence chamber is connected to the first fluid outlet and is provided with a second fluid outlet 402 connected to the external output fluid, and the second fluid outlet is provided on the stator housing.

[0073] The rotor disc is provided with a pressure relief groove 107, which is two grooves located at the front and rear sides of the piston, and is located in the annular sealing cavity.

[0074] It also includes an intermittent motion mechanism that drives the valve to open and close. The intermittent motion mechanism includes a rotating wheel, on which a cam groove 801 is opened. The cam groove is a cam-shaped groove. The intermittent motion mechanism is connected to the valve through an ejector pin 605. The ejector pin is a rod-shaped structure with a hook at one end. The hook is embedded in the cam groove. The other end of the ejector pin is connected to the valve, so that the rotation of the rotating wheel drives the ejector pin to push and pull along the radial direction of the rotor disk; the raised part of the cam groove corresponds to the position of the piston, so that when the piston passes through the valve, the ejector pin is pushed outward along the radial direction of the rotor disk to drive the valve to open.

[0075] There are two running wheels, which are located on both sides of the rotor disc, and there are two corresponding ejector pins.

[0076] An application of a variable volume pump body, using the above variable volume pump body as a fluid pump, the input fluid is a low-pressure fluid, the output fluid is a high-pressure fluid, the rotor disc is connected to the motor input shaft, the motor drives the rotor disc to rotate and compresses the low-pressure fluid into a high-pressure fluid for output.

[0077] When in use, the source motor drives the rotor piston to make circular motion along the ring through the motor input shaft, and the piston squeezes the fluid in the second variable volume chamber in front. Under the action of this pressure, the volume of the second variable volume chamber is reduced, the pressure increases, and the fluid flows out to the outside through the outlet confluence chamber along the first fluid outlet. At the same time, due to the increase in the volume of the first variable volume chamber behind the piston and the decrease in pressure, the low-pressure fluid outside is sucked into the first variable volume chamber through the inlet confluence chamber. When the piston continues to move forward and approaches the valve in front, the valve opens with the cooperation of the intermittent motion mechanism, and the valve closes after the piston passes. At this time, the valve originally located in front of the piston is behind the piston, and the piston and another valve in front form a second variable volume chamber. The piston continues to move forward to squeeze the second variable volume chamber, so that the annular sealing chamber is like a chamber that continues to extend forward infinitely. The piston repeatedly moves in a circle along the annular sealing chamber, and the extrusion and suction actions are repeated.

[0078] Embodiment 2

[0079] In this embodiment, the number of pistons is 2, the number of valves is 3, the pistons are evenly distributed along the ring on the rotor disc, and the valves are evenly distributed along the ring on the stator housing at positions corresponding to the annular sealed chamber. The annular sealed chamber includes 2 first variable volume chambers and 2 second variable volume chambers.

[0080] The parts not mentioned in this embodiment are the same as those in the first embodiment.

[0081] Embodiment 3

[0082] The valve is a butterfly valve, including a shell 701 and a butterfly-shaped valve plate 702. The shell is installed on the stator housing, and the valve plate is installed in the shell. The middle part of the valve plate is rotatably connected to the shell. One end of the valve plate is connected to the shell through a reset spring 703. Under the tension of the reset spring, the other end of the valve plate is stuck in the annular sealing cavity; when the piston passes, the valve plate is pushed open, and after the piston passes, the valve plate is closed under the action of the reset spring.

[0083] When in use, the source motor drives the rotor piston to make circular motion along the ring through the motor input shaft, and the piston squeezes the fluid in the second variable volume chamber in front. Under the action of this pressure, the volume of the second variable volume chamber is reduced, the pressure increases, and the fluid flows out to the outside through the outlet confluence chamber along the first fluid outlet. At the same time, due to the increase in the volume of the first variable volume chamber behind the piston and the decrease in pressure, the low-pressure fluid outside is sucked into the second variable volume chamber through the inlet confluence chamber. When the piston continues to move forward to the valve in front, the valve plate opens under the push of the piston. When the piston passes, the valve plate closes under the action of the reset spring. At this time, the valve originally located in front of the piston is behind the piston. The piston and another valve in front form a second variable volume chamber. The piston continues to move forward to squeeze the second variable volume chamber, so that the annular sealing chamber is like a chamber that continues to extend forward infinitely. The piston repeatedly moves in a circle along the annular sealing chamber, and constantly repeats the extrusion and suction actions.

[0084] The parts not mentioned in this embodiment are the same as those in the first embodiment.

[0085] Embodiment 4

[0086] A first annular groove is provided on the front side of the rotor disc, and a second annular groove is provided at a corresponding position on the rear side of the rotor disc. The front cylinder cover and the first groove cooperate to form an inlet confluence chamber, and the rear cylinder cover and the second groove cooperate to form an outlet confluence chamber.

[0087] The parts not mentioned in this embodiment are the same as those in the third embodiment.

[0088] Embodiment 5

[0089] An application of a variable displacement pump body, using the above variable displacement pump body as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, the high-pressure fluid pushes the piston to make a circular motion and drives the rotor to rotate.

[0090] When in use, the first fluid outlet in front of the piston is connected to the low-pressure fluid through the outlet confluence chamber, and the first fluid inlet behind the piston is connected to the high-pressure fluid through the inlet confluence chamber, so that the piston moves forward under the action of the front and rear pressure difference. When the piston moves forward to the valve in front, the valve opens with the cooperation of the intermittent motion mechanism. After the piston passes, the valve closes. At this time, the valve originally located in front of the piston is behind the piston, and the piston continues to move forward, so that the annular sealing chamber is like a cavity that continues to extend forward infinitely. The high-pressure fluid pushes the piston to perform circular motion along the annular sealing chamber over and over again, and drives the output shaft on the rotor disc to rotate.

[0091] The parts not mentioned in this embodiment are the same as those in the first embodiment.

[0092] Embodiment 6

[0093] An application of a variable displacement pump body, using the above variable displacement pump body as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, the high-pressure fluid pushes the piston to make a circular motion and drives the rotor to rotate.

[0094] When in use, the first fluid outlet in front of the piston is connected to the low-pressure fluid through the outlet confluence chamber, and the first fluid inlet behind the piston is connected to the high-pressure fluid through the inlet confluence chamber, so that the piston moves forward under the action of the front and rear pressure difference. When the piston moves forward to the valve in front, the valve opens with the cooperation of the intermittent motion mechanism. After the piston passes, the valve closes. At this time, the valve originally located in front of the piston is behind the piston, and the piston continues to move forward, so that the annular sealing chamber is like a cavity that continues to extend forward infinitely. The high-pressure fluid pushes the piston to perform circular motion along the annular sealing chamber over and over again, and drives the output shaft on the rotor disc to rotate.

[0095] The parts not mentioned in this embodiment are the same as those in the second embodiment.

[0096] Embodiment 7

[0097] An application of a variable displacement pump body, using the above variable displacement pump body as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, the high-pressure fluid pushes the piston to make a circular motion and drives the rotor to rotate.

[0098] When in use, the first fluid outlet in front of the piston is connected to the low-pressure fluid through the outlet confluence chamber, and the first fluid inlet behind the piston is connected to the high-pressure fluid through the inlet confluence chamber, so that the piston moves forward under the action of the front and rear pressure difference. When the piston moves to the valve in front, the valve plate opens under the push of the piston. When the piston passes, the valve plate closes under the action of the return spring. At this time, the valve originally located in front of the piston is behind the piston, and the piston continues to move forward, so that the annular sealing chamber is like a cavity that continues to extend forward infinitely. The high-pressure fluid pushes the piston to perform circular motion along the annular sealing chamber over and over again, and drives the output shaft on the rotor disc to rotate.

[0099] The parts not mentioned in this embodiment are the same as those in the third embodiment.

[0100] Embodiment 8

[0101] An application of a variable displacement pump body, using the above variable displacement pump body as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, the high-pressure fluid pushes the piston to make a circular motion and drives the rotor to rotate.

[0102] When in use, the first fluid outlet in front of the piston is connected to the low-pressure fluid through the outlet confluence chamber, and the first fluid inlet behind the piston is connected to the high-pressure fluid through the inlet confluence chamber, so that the piston moves forward under the action of the front and rear pressure difference. When the piston moves forward to the valve in front, the valve opens with the cooperation of the intermittent motion mechanism. After the piston passes, the valve closes. At this time, the valve originally located in front of the piston is behind the piston, and the piston continues to move forward, so that the annular sealing chamber is like a cavity that continues to extend forward infinitely. The high-pressure fluid pushes the piston to perform circular motion along the annular sealing chamber over and over again, and drives the output shaft on the rotor disc to rotate.

[0103] The parts not mentioned in this embodiment are the same as those in the fourth embodiment.

[0104] Embodiment 9

[0105] A variable displacement pump body comprises a stator housing and a rotor. The rotor cooperates with the stator housing to form an annular sealed cavity. The rotor comprises a rotor disc 1 and a piston 2 fixedly connected to the rotor disc. The piston is located in the annular sealed cavity. The cross-sectional shape of the piston matches the cross-sectional shape of the annular sealed cavity and slides in the annular sealed cavity.

[0106] The rotor disc is a disc-shaped structure with annular ribs. There are two annular ribs, which are respectively located at the outer edges of both sides of the rotor disc, so that an annular groove is formed between the two annular ribs, and the piston is fixed in the annular groove.

[0107] The stator housing includes a cylinder housing 3, a front cylinder head 4, a rear cylinder head 5, and bolts. The cylinder housing is an annular structure and its inner diameter matches the outer diameter of the two annular ribs on the rotor disc. The cylinder housing is sleeved on the outer circumference of the rotor disc to form an annular sealing area between the cylinder housing and the rotor disc. The front cylinder head and the rear cylinder head are both annular cover plates with a recessed cavity in the middle. The front cylinder head and the rear cylinder head are respectively installed on both sides of the rotor disc. The bolts penetrate and fix the cylinder housing, the front cylinder head and the rear cylinder head. An axial hole is provided at the bottom of the recessed cavity, and an axis passing through the axial hole is installed at the center of the rotor disc.

[0108] A valve is arranged on the stator housing, and the valve isolates the annular sealing cavity when it is closed, and connects the annular sealing cavity when it is opened.

[0109] The number of pistons is 1, the number of valves is 2, and the valves are evenly distributed along the ring at positions corresponding to the annular sealing chamber on the stator housing.

[0110] The valve is a gate valve 6, including a shell 601, a valve plate 602, a reset spring 604, and a three-way ball valve 603. The valve plate is T-shaped, including a head and a protrusion. The shell is arranged on the stator shell, and a cavity opening toward the center of the stator shell is arranged in the shell. The head of the valve plate can be slidably installed in the cavity up and down. A mounting port 301 matching the protrusion is opened on the stator shell, and the protrusion is inserted into the annular sealing cavity from the mounting port, so that the opening below the cavity is closed by the stator shell and the protrusion of the valve plate. Through holes penetrating the head from top to bottom are opened at both ends of the head of the valve plate, and the reset spring is installed between the top of the cavity and the head of the valve plate.

[0111] The three-way ball valve includes a valve body, which includes a front channel, a middle channel and a rear channel. A valve core 606 that can block the front channel or the rear channel is also provided in the valve body. The middle channel is connected to the top of the cavity, and the front channel and the rear channel are respectively connected to the annular sealing cavity on the front and rear sides of the valve. The valve core is spherical, and the position of the valve core includes two positions, namely a first position at the port of the front channel and a second position at the port of the rear channel. The position of the valve is controlled by the pressure difference between the front and rear sides of the annular sealing cavity and moved to a position with lower pressure.

[0112] Along the direction of piston movement, the annular sealing area between the piston and the valve closest to the rear side forms a first variable volume chamber, and the annular sealing area between the piston and the valve closest to the front side forms a second variable volume chamber, so that the annular sealing chamber includes a first variable volume chamber and a second variable volume chamber.

[0113] The rotor is also provided with a first fluid inlet 101 connecting the first variable volume chamber and the external input fluid, and a first fluid outlet 102 connecting the second variable volume chamber and the external output fluid. Along the forward direction of the piston, the first fluid outlet is arranged at a position in front of the piston on an annular rib, and the first fluid inlet is arranged at a position behind the piston on another annular rib. Both the first fluid outlet and the first fluid inlet are through holes that penetrate the annular rib.

[0114] The front cylinder cover is provided with an annular second groove 106, and the rear cylinder cover is provided with an annular first groove 105. The first groove cooperates with the rotor disc to form an inlet confluence chamber, and the second groove cooperates with the rotor disc to form an outlet confluence chamber.

[0115] The first fluid outlet is opened on the annular rib close to the side of the front cylinder head, and the first fluid inlet is opened on the annular rib close to the side of the rear cylinder head. The opening position of the first groove corresponds to the position of the first fluid inlet, so that the inlet confluence chamber is connected to the first variable volume chamber through the first fluid inlet, and the opening position of the second groove corresponds to the position of the first fluid outlet, so that the outlet confluence chamber is connected to the second variable volume chamber through the first fluid outlet.

[0116] The rear cylinder cover is provided with a second fluid inlet 401 communicating with the inlet merging chamber and the external input fluid, and the front cylinder cover is provided with a second fluid outlet 402 communicating with the outlet merging chamber and the external input fluid.

[0117] The rotor disc is provided with a pressure relief groove 107, which is two grooves located at the front and rear sides of the piston, and is located in the annular sealing cavity.

[0118] It also includes an intermittent motion mechanism that drives the valve to open and close. The intermittent motion mechanism includes a rotating wheel, on which a cam groove 801 is opened. The cam groove is a cam-shaped groove. The intermittent motion mechanism is connected to the valve through an ejector pin 605. The ejector pin is a rod-shaped structure with a hook at one end. The hook is embedded in the cam groove. The other end of the ejector pin is connected to the valve, so that the rotation of the rotating wheel drives the ejector pin to push and pull along the radial direction of the rotor disk; the raised part of the cam groove corresponds to the position of the piston, so that when the piston passes through the valve, the ejector pin is pushed outward along the radial direction of the rotor disk to drive the valve to open.

[0119] There are two running wheels, which are located on both sides of the rotor disc, and there are two corresponding ejector pins.

[0120] An application of a variable volume pump body, using the above variable volume pump body as a fluid pump, the input fluid is a low-pressure fluid, the output fluid is a high-pressure fluid, the rotor disc is connected to the motor input shaft, the motor drives the rotor disc to rotate and compresses the low-pressure fluid into a high-pressure fluid for output.

[0121] When in use, the source motor drives the rotor piston to make circular motion along the ring through the motor input shaft, and the piston squeezes the fluid in the second variable volume chamber in front. Under the action of this pressure, the volume of the second variable volume chamber is reduced, the pressure increases, and the fluid flows out to the outside through the outlet confluence chamber along the first fluid outlet. At the same time, due to the increase in the volume of the first variable volume chamber behind the piston and the decrease in pressure, the low-pressure fluid outside is sucked into the first variable volume chamber through the inlet confluence chamber. When the piston continues to move forward and approaches the valve in front, the valve opens with the cooperation of the intermittent motion mechanism, and the valve closes after the piston passes. At this time, the valve originally located in front of the piston is behind the piston, and the piston and another valve in front form a second variable volume chamber. The piston continues to move forward to squeeze the second variable volume chamber, so that the annular sealing chamber is like a chamber that continues to extend forward infinitely. The piston repeatedly moves in a circle along the annular sealing chamber, and the extrusion and suction actions are repeated.

[0122] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A variable volume pump body, characterized in that: It includes a stator housing and a rotor, wherein the rotor cooperates with the stator housing to form an annular sealed cavity, and the rotor includes a rotor disc and a piston fixedly connected to the outer edge of the rotor disc, wherein the cross-sectional shape of the piston matches the cross-sectional shape of the annular sealed cavity and slides in the annular sealed cavity; The stator housing is also provided with a valve, which isolates the annular sealing cavity when closed and connects the annular sealing cavity when opened; Along the direction of piston movement, the annular sealing area between the piston and the valve closest to the rear side forms a first variable volume chamber, and the annular sealing area between the piston and the valve closest to the front side forms a second variable volume chamber; The number of pistons is n, the number of valves is at least n+1, the pistons are evenly distributed along the ring at the outer edge of the rotor disk, and the valves are evenly distributed along the ring at positions corresponding to the annular sealed cavities on the stator housing, forming n first variable-volume cavities and n second variable-volume cavities, where n is an integer not less than 1; The rotor is also provided with a first fluid inlet connected to the first variable volume cavity and external input fluid, and a first fluid outlet connected to the second variable volume cavity and external output fluid; A variable displacement pump body also includes an annular inlet confluence chamber and an annular outlet confluence chamber, both of which are formed by the cooperation of a rotor disc and a stator housing; The inlet manifold is connected to the first fluid inlet and is provided with a second fluid inlet connected to the external input fluid, and the second fluid inlet is provided on the stator housing; The outlet confluence cavity is connected to the first fluid outlet and is provided with a second fluid outlet connected to the external output fluid, and the second fluid outlet is provided on the stator housing; The stator housing includes a cylinder housing, a front cylinder cover, a rear cylinder cover, and bolts. The cylinder housing is annular and its inner diameter is larger than the outer diameter of the rotor disc. The cylinder housing is sleeved on the outer circumference of the rotor disc. The front cylinder cover and the rear cylinder cover are respectively installed on both sides of the rotor disc. The annular area between the rotor disc, the cylinder housing, the front cylinder cover and the rear cylinder cover forms an annular sealing chamber. Bolts penetrate and securely connect the cylinder housing, the front cylinder head and the rear cylinder head. The rear cylinder head is also provided with an axial hole, and a shaft passing through the axial hole is installed at the center of the rotor disc. Two annular first grooves are provided on both sides of the rotor disc, a connecting hole is provided between the two first grooves, and the front cylinder cover, the rear cylinder cover and the two first grooves cooperate to form an inlet confluence chamber; Two annular second grooves are provided on both sides of the rotor disc, a connecting hole is provided between the two second grooves, and the front cylinder cover, the rear cylinder cover and the two second grooves cooperate to form an outlet confluence chamber; Along the forward direction of the piston, the first fluid inlet is arranged on the rear side of the piston, and is connected to the inlet confluence chamber through an inlet flow channel, and the inlet flow channel is a channel that passes through the piston and connects to the inlet confluence chamber; the first fluid outlet is arranged on the front side of the piston, and is connected to the outlet confluence chamber through an outlet flow channel, and the outlet flow channel is a channel that passes through the piston and connects to the outlet confluence chamber.

2. A variable displacement pump body according to claim 1, characterized in that: The rotor disc is provided with a pressure relief groove, which is two grooves located on the front and rear sides of the piston, and the pressure relief groove is located in the annular sealing cavity.

3. A variable displacement pump body according to claim 1, characterized in that: The valve is a gate valve, including a shell, a valve plate, a return spring, and a three-way ball valve. The valve plate is T-shaped, including a head and a protrusion. The shell is arranged on the stator shell. A cavity opening toward the center of the stator shell is arranged in the shell. The head of the valve plate can be slidably installed in the cavity. A mounting opening matching with the protrusion is arranged on the stator shell. The protrusion is inserted into the annular sealing cavity from the mounting opening, so that the opening below the cavity is closed by the stator shell and the protrusion of the valve plate. Through holes penetrating the head from top to bottom are arranged at both ends of the head of the valve plate. The return spring is installed between the top of the cavity and the head of the valve plate. The three-way ball valve includes a valve body, which includes a front channel, an intermediate channel and a rear channel. A valve core that can block the front channel or the rear channel is also provided in the valve body. The intermediate channel is connected to the top of the cavity, and the front channel and the rear channel are respectively connected to the annular sealing cavity on the front and rear sides of the valve. The valve core is spherical, and the position of the valve core includes 2 positions, namely a first position at the port of the front channel and a second position at the port of the rear channel. The position of the valve is controlled by the pressure difference between the front and rear sides of the annular sealing cavity and moved to a position with lower pressure.

4. A variable displacement pump body according to claim 3, characterized in that: It also includes an intermittent motion mechanism that drives the valve to open and close. The intermittent motion mechanism includes a rotating wheel, on which a cam groove is provided. The cam groove is a cam-shaped groove. The intermittent motion mechanism is connected to the valve through a pin. The pin is a rod-shaped structure with a hook at one end. The hook is embedded in the cam groove. The other end of the pin is connected to the valve, so that the rotation of the rotating wheel drives the pin to push and pull along the radial direction of the rotor disc; the raised part of the cam groove corresponds to the position of the piston, so that when the piston passes through the valve, the pin is pushed outward along the radial direction of the rotor disc to drive the valve to open.

5. A variable displacement pump body according to claim 1, characterized in that: The valve is a butterfly valve, including a shell and a butterfly-shaped valve plate. The shell is installed on the stator housing, and the valve plate is installed in the shell. The middle part of the valve plate is rotatably connected to the shell. One end of the valve plate is connected to the shell through a reset spring. Under the tension of the reset spring, the other end of the valve plate is stuck in the annular sealing cavity; when the piston passes, the valve plate is pushed open, and after the piston passes, the valve plate is closed under the action of the reset spring.

6. An application of a variable volume pump body, characterized in that: A variable displacement pump body as described in any one of claims 1 to 5 is used as a fluid pump, the input fluid is a low-pressure fluid, the output fluid is a high-pressure fluid, the rotor disc is connected to the motor input shaft, the motor drives the rotor disc to rotate and compresses the low-pressure fluid into a high-pressure fluid for output.

7. An application of a variable volume pump body, characterized in that: A variable displacement pump body as described in any one of claims 1 to 5 is used as a motor, the input fluid is a high-pressure fluid, the output fluid is a low-pressure fluid, an output shaft is provided on the rotor disc, and the high-pressure fluid pushes the piston to perform circular motion and drives the rotor to rotate.

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