A helical groove hydraulic diaphragm metering pump

Abstract

The utility model discloses a spiral groove hydraulic diaphragm metering pump, constitute by hydraulic unit and power unit, hydraulic unit includes: pump head, inside is equipped with medium cavity, still is equipped with with liquid inlet check valve and liquid discharge check valve, hydraulic cylinder body, inside is equipped with hydraulic chamber, its with pump head is connected, diaphragm, is located between pump head and cylinder body, is used for cutting off medium cavity with hydraulic chamber, release valve, its is located on the cylinder body, connecting body, inside is equipped with cavity, its with cylinder body is connected, is equipped with plunger hole on it, still is equipped with slide bar hole, hollow plunger, inside is equipped with hollow groove, and the outer wall circumferential is equipped with with hollow groove intercommunication's backflow hole, hollow plunger sliding is located in plunger hole, and hollow groove is linked with hydraulic chamber, the amount of regulation sliding sleeve, sliding sleeve is equipped on hollow plunger, the amount of regulation knob, rotation is equipped on connecting body, is used for adjusting the distance of the amount of regulation sliding sleeve and backflow hole, and the cavity is equipped with hydraulic oil, power unit is connected with connecting body, is used for driving hollow plunger reciprocating sliding in plunger hole.

Description

Technical Field

[0001] This utility model relates to the field of metering pump technology, specifically to a spiral groove hydraulic diaphragm metering pump. Background Technology

[0002] Metering pumps belong to the category of reciprocating positive displacement pumps. They are fluid devices used for precise delivery and flow regulation, and are widely used in energy, chemical, pharmaceutical, and water treatment fields. The main characteristics of metering pumps are: (1) the flow rate can be continuously and steplessly adjusted; (2) the flow rate is almost unaffected by the output pressure; and (3) the flow rate accuracy is high.

[0003] Currently, the reciprocating motion of existing metering pumps is generally achieved using a crankshaft (eccentric wheel), connecting rod, and slide bar structure. However, this structure has certain drawbacks, such as large size, many parts, complex structure, and large flow pulsation. Utility Model Content

[0004] The purpose of this invention is to provide a spiral groove hydraulic diaphragm metering pump, which aims to solve the above-mentioned problems existing in the reciprocating motion method of metering pumps using eccentric wheel, connecting rod and slide bar structure.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] This utility model designs a spiral groove hydraulic diaphragm metering pump, which consists of a hydraulic unit and a power unit.

[0007] The hydraulic unit includes the following structural configuration:

[0008] The pump head has a medium chamber inside, and is equipped with an inlet check valve and a outlet check valve that communicate with the medium chamber.

[0009] A hydraulic cylinder body, which has a hydraulic chamber inside, is connected to the pump head;

[0010] A diaphragm is disposed between the pump head and the hydraulic cylinder body to isolate the medium chamber from the hydraulic chamber;

[0011] A release valve is disposed on the hydraulic cylinder body and is also connected to the hydraulic chamber;

[0012] A connecting body with an internal cavity is provided. The connecting body is connected to a hydraulic cylinder body and has a plunger hole that connects the hydraulic cavity and the cavity. A slide rod hole is also provided at one end of the connecting body opposite to the plunger hole.

[0013] A hollow plunger is disposed within the cavity. The interior of the hollow plunger has a hollow groove with one end open. A plurality of reflux holes communicating with the hollow groove are arranged circumferentially around the outer wall of the hollow plunger. One end of the hollow plunger is also slidably disposed in the plunger hole and forms a precise clearance fit with it. The hollow groove is connected to the hydraulic chamber.

[0014] Adjustable sliding sleeve, which is slidably fitted onto the outer wall of the hollow plunger;

[0015] And an adjustment knob, which is rotatably mounted on the connecting body, for adjusting the distance between the adjustment sleeve and the return hole. The cavity is filled with hydraulic oil that submerges the hollow plunger (specifically, the adjustment knob can adjust the position of the adjustment sleeve on the outer wall of the hollow plunger, thereby adjusting the distance between the adjustment sleeve and the return hole).

[0016] The power unit is connected to one end of the connector with a slide bar hole, and the power unit is also connected to the hollow plunger to drive the hollow plunger to slide back and forth in the plunger hole.

[0017] Furthermore, a spiral groove hydraulic diaphragm metering pump includes a buffer valve disposed in the hydraulic chamber to reduce the impact of the hydraulic oil on the diaphragm.

[0018] Specifically, during the reciprocating motion of the hollow plunger, hydraulic oil is pushed, which impacts the diaphragm. To prevent the diaphragm from being damaged by prolonged hydraulic oil impact, a buffer valve is installed. This reduces the impact of hydraulic oil on the diaphragm during the reciprocating motion of the hollow plunger and extends its service life.

[0019] Furthermore, in a spiral groove hydraulic diaphragm metering pump, a cover plate is also provided on the connecting body. Specifically, during the use of the metering pump, the hollow plunger needs to reciprocate within the plunger bore for a long time, and there is also prolonged sliding friction between the hollow plunger and the adjusting sleeve, which easily causes wear on the hollow plunger. To facilitate the replacement of the worn hollow plunger, a cover plate is provided on the connecting body, allowing the hollow plunger to be removed from the cavity of the connecting body by opening the cover plate. If the adjusting knob causes interference during the removal of the hollow plunger, the adjusting knob can be removed from the connecting body first, and then the hollow plunger can be removed.

[0020] Furthermore, a spiral groove hydraulic diaphragm metering pump: the reflux hole is located close to the bottom of the hollow groove.

[0021] Furthermore, a spiral groove hydraulic diaphragm metering pump is provided with a rack on the adjusting sleeve, a gear meshing with the rack on the adjusting knob, and an adjusting scale on the adjusting knob.

[0022] Furthermore, in a spiral groove hydraulic diaphragm metering pump, a locking handle is also provided on the connecting body, which is used to lock the adjustment knob on the connecting body and restrict its rotation.

[0023] Specifically, the position of the adjusting sleeve is prone to movement due to vibration during the operation of the metering pump after adjustment. Therefore, a locking handle is designed to lock the adjusting knob in place. The adjusting knob and the adjusting sleeve mesh with each other. After the adjusting knob is fixed by the locking handle, the position of the adjusting sleeve is also relatively fixed. The locking handle can be threaded onto the connecting body. After tightening, it can abut against the side of the adjusting knob, thereby securing the adjusting knob and preventing it from continuing to rotate after adjustment.

[0024] Furthermore, a spiral groove hydraulic diaphragm metering pump: the power unit includes the following structural configuration:

[0025] The housing has an assembly cavity inside. The housing is connected to the connecting body. After the housing and the connecting body are assembled, the slide rod hole can communicate with the cavity and the assembly cavity.

[0026] A slide rod, one end of which passes through the slide rod hole and connects to the end of the hollow plunger, and a precise clearance fit is formed between the slide rod and the slide rod hole; the other end of the slide rod extends into the assembly cavity and is also provided with an open slot.

[0027] Several pins are respectively disposed on the slide bar and one end extends into the slot;

[0028] The main shaft is rotatably mounted in the housing, and a closed spiral groove is obliquely arranged around its surface. One end of the main shaft is inserted into the slot and has the freedom of rotation. The pin is slidably engaged with the spiral groove. After the main shaft rotates, it drives the slide rod to slide back and forth in the slide rod hole (specifically, the main shaft cannot move axially back and forth, but can only rotate. Because the main shaft surface has a spiral groove structure, the sliding engagement between the pin and the spiral groove allows the slide rod to slide back and forth after the main shaft rotates).

[0029] And a motor, which is connected to the other end of the main shaft, for driving the main shaft to rotate.

[0030] Furthermore, in a spiral groove hydraulic diaphragm metering pump: a guide groove is provided on the outer wall of the slide rod end, and a guide pin is provided on the housing. The guide pin slides in conjunction with the guide groove to restrict the slide rod from rotating with the main shaft. That is, the guide groove and guide pin ensure that the slide rod can only slide back and forth in a straight line.

[0031] Furthermore, a spiral groove hydraulic diaphragm metering pump includes a power unit that further includes a speed reducer, through which the motor and the main shaft are connected.

[0032] Furthermore, in a spiral groove hydraulic diaphragm metering pump, the hollow plunger and the slide rod are respectively provided with a first chuck and a second chuck. After the first chuck and the second chuck are mated, they are connected by a retaining ring to achieve a clamping connection between the hollow plunger and the slide rod. The first chuck and the second chuck are also respectively provided with a first inclined surface, and the retaining ring is provided with a second inclined surface that cooperates with the first inclined surface to achieve precise mating of the first chuck and the second chuck, thereby ensuring that the axes of the hollow plunger and the slide rod are on the same straight line after they are connected.

[0033] The beneficial effects of this utility model are:

[0034] The spiral groove hydraulic diaphragm metering pump designed in this utility model has a simple structure, good manufacturability, and low cost. Moreover, the spiral groove structure set on the main shaft and the cooperation of the pin can enable the slide rod to drive the hollow plunger to make uniform linear motion. This can ensure the stable flow of the diaphragm metering pump. In contrast, the flow curve of the traditional crankshaft connecting rod structure metering pump is an approximately sinusoidal waveform with large flow pulsation.

[0035] This utility model designs a spiral groove hydraulic diaphragm metering pump, which is composed of a main shaft with spiral grooves, a slide rod, and a pin. When the main shaft rotates, it drives the slide rod to perform reciprocating linear motion. Compared with the traditional structure that uses a crankshaft, connecting rod, and slide rod to achieve the reciprocating motion of the metering pump, this structure has a small size, fewer parts, and lower cost.

[0036] This utility model designs a spiral groove hydraulic diaphragm metering pump. Its metering adjustment mechanism consists of a hollow plunger, an adjusting sleeve, and an adjusting knob. Rotating the adjusting knob causes a gear on the knob to mesh with a rack on the adjusting sleeve, moving the adjusting sleeve forward and backward along the circumference of the hollow plunger. This controls the return flow of hydraulic oil, changing the flow rate of the metering pump and achieving the metering adjustment function. Its advantages include a very simple structural design, reliable performance, low production and operating costs, and convenient installation. Furthermore, the hydraulic oil bypass flow adjustment structure experiences minimal wear, stable performance, and a long service life. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of the structure of the spiral groove hydraulic diaphragm metering pump designed for Example 1;

[0039] Figure 2 for Figure 1 Cross-sectional view along the AA direction;

[0040] Figure 3 This is a schematic diagram of the reciprocating motion mechanism of the metering pump, which consists of a main shaft, a slide bar, and a pin, in Example 1.

[0041] Figure 4 This is a schematic diagram of the metering pump adjustment mechanism in Example 1, which consists of a hollow plunger, an adjustment sleeve, and an adjustment knob.

[0042] Figure 5 This is a schematic diagram of the connector structure in Example 1.

[0043] The markings in the image are as follows:

[0044] 1-Pump head, 2-Hydraulic cylinder body, 3-Diaphragm, 4-Release valve, 5-Connector, 6-Hollow plunger, 7-Adjusting sleeve, 8-Adjusting knob, 9-Hydraulic oil, 10-Buffer valve, 11-Media chamber, 12-Inlet check valve, 13-Drain check valve, 20-Housing, 21-Hydraulic chamber, 30-Slide rod, 40-Pin, 50-Spindle, 51-Cavity, 52-Plunger hole, 53-Slide rod hole, 54-Cover plate, 55-Locking handle, 60-Motor, 61-Hollow groove, 62-Return hole, 63-First chuck, 70-Guide pin, 71-Rack, 80-Reducer, 81-Gear, 82-Adjusting scale, 100-Snap ring, 201-Assembly cavity, 301-Slot, 302-Guide groove, 303-Second chuck, 501-Helical groove. Detailed Implementation

[0045] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0046] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," and "bottom," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0047] Example 1

[0048] like Figures 1-5 As shown, this embodiment 1 designs a spiral groove hydraulic diaphragm metering pump, which consists of a hydraulic unit and a power unit;

[0049] The hydraulic unit includes the following structural configuration:

[0050] Pump head 1, which has a medium chamber 11 inside, and is also provided with an inlet check valve 12 and a drain check valve 13 that are connected to the medium chamber 11;

[0051] The hydraulic cylinder body 2 has a hydraulic chamber 21 inside. The hydraulic cylinder body 2 is connected to the pump head 1. The hydraulic chamber 21 is also equipped with a buffer valve 10.

[0052] The diaphragm 3 is disposed between the pump head 1 and the hydraulic cylinder 2 to isolate the medium chamber 11 and the hydraulic chamber 21, so that the medium chamber 11 and the hydraulic chamber 21 are not connected to each other.

[0053] Release valve 4 is disposed on the hydraulic cylinder body 2 and is also connected to the hydraulic chamber 21;

[0054] The connecting body 5 has a cavity 51 inside. The connecting body 5 is connected to the hydraulic cylinder body 2. It has a plunger hole 52 that connects the hydraulic cavity 21 and the cavity 51. The connecting body 5 also has a slide rod hole 53 at one end opposite to the plunger hole 52. The connecting body 5 also has a cover plate 54 and a locking handle 55.

[0055] A hollow plunger 6 is disposed within the cavity 51. The hollow plunger 6 has a hollow groove 61 with one end open inside. A plurality of return holes 62 communicating with the hollow groove 61 are arranged circumferentially around the outer wall of the hollow plunger 6. The return holes 62 are also disposed close to the bottom of the hollow groove 61. One end of the hollow plunger 6 is also slidably disposed in the plunger hole 52 and forms a precise clearance fit with it. The hollow groove 61 communicates with the hydraulic cavity 21. A first chuck 63 is also disposed at the end of the hollow plunger 6 away from the opening of the hollow groove 61. The edge of the first chuck 63 is provided with a first inclined surface.

[0056] Adjustable sliding sleeve 7 is slidably sleeved on the outer wall of the hollow plunger 6, and the adjustable sliding sleeve 7 is also provided with a rack 71 extending along the length direction of the hollow plunger 6.

[0057] The metering knob 8 is rotatably mounted on the connecting body 5. It is also equipped with a gear 81 that meshes with the rack 71 and an adjustment scale 82. The metering knob 8 is used to adjust the position of the metering sleeve 7 on the outer wall of the hollow plunger 6 (i.e., adjusting the distance between the metering sleeve 7 and the return hole 62). The cavity 51 contains hydraulic oil 9 that submerges the hollow plunger 6. The buffer valve 10 in the hydraulic chamber 21 can be used to reduce the impact of the hydraulic oil 9 on the diaphragm 3. The locking handle 55 on the connecting body 5 can be used to lock the metering knob 8 onto the connecting body 5, thereby limiting the rotation of the metering knob 8 and fixing the position of the metering sleeve 7 on the hollow plunger 6. This prevents the metering sleeve 7 from shifting due to vibration during the operation of the metering pump, ensuring the metering effect.

[0058] The power unit is connected to one end of the connecting body 5 that has a slide bar hole 53, and is used to drive the hollow plunger 6 to reciprocate in the plunger hole 52. The power unit includes the following structural configuration:

[0059] The housing 20 has an assembly cavity 201 inside, which is connected to the connecting body 5 by bolts. The slide hole 53 connects the cavity 51 and the assembly cavity 201. The housing 20 is also provided with a guide pin 70 that extends into the assembly cavity 201.

[0060] The slide rod 30 has a second chuck 303 at one end, and the edge of the second chuck 303 has a first inclined surface. This end passes through the slide rod hole 53 and then mates with the first chuck 63 on the hollow plunger 6 through the second chuck 303. After mating, the first chuck 63 and the second chuck 303 are clamped together by a retaining ring 100 to achieve a fixed connection between the hollow plunger 6 and the slide rod 30. (The retaining ring 100 has a second inclined surface that mates with the first inclined surface. Through the mutual cooperation of the first and second inclined surfaces in the chuck and the retaining ring, the precise mating of the first chuck 63 and the second chuck 303 can be achieved, thereby improving the connection between the slide rod 30 and the hollow plunger.) 6. The alignment accuracy ensures that the axes of both are aligned, which facilitates the reciprocating motion of the hollow plunger 6 along a straight line driven by the slide rod 30, reducing contact wear between the hollow plunger 6 and the plunger hole 52. A precise clearance fit is formed between the slide rod 30 and the slide rod hole 53. The other end of the slide rod 30 extends into the assembly cavity 201 and is provided with an open slot 301. An axially extending guide groove 302 is also provided on the outer wall of the slide rod 30 at this end. The guide pin 70 slides in conjunction with the guide groove 302 to limit the slide rod 30 from rotating with the main shaft 50, ensuring that the slide rod 30 can only reciprocate along a straight line.

[0061] Two pins 40 are provided, which are radially symmetrically arranged on the slide bar 30 and one end extends into the slot 301;

[0062] The main shaft 50 is rotatably mounted in the housing 20, and a closed spiral groove 501 with a spiral-like structure is obliquely arranged around its surface. One end of the main shaft 50 is inserted into the slot 301 and has the freedom of rotation. The pin 40 is slidably engaged with the spiral groove 501. After the main shaft 50 rotates, it can drive the slide rod 30 to slide back and forth in a straight line in the slide rod hole 53.

[0063] And a motor 60, which is connected to the other end of the main shaft 50 via a reducer 80, for driving the main shaft 50 to rotate.

[0064] Specifically, the spiral groove hydraulic diaphragm metering pump designed in Embodiment 1 above comprises a reciprocating motion mechanism consisting of a main shaft 50 with a spiral groove 501, a slide rod 30, and pins 40. The surface of the end of the main shaft 50 is provided with a spiral groove 501 and is inserted into the slot 301 of the slide rod 30. Two pins 40 are provided on the slide rod 30 and are movably connected to the spiral groove 501. When the rotation angle of the main shaft 50 is between 0 and 180°, the slide rod 30 performs a lifting (forward) motion. When the rotation angle of the main shaft 50 is between 180 and 360°, the slide rod performs a lowering (backward) motion. When the main shaft 50 rotates one revolution, the slide rod 30 completes one reciprocating motion.

[0065] The stroke of the hollow plunger 6 driven by the slide bar 30 in a uniform reciprocating motion is constant, so the flow rate of the metering pump is constant. Therefore, a metering pump adjustment mechanism is set up, consisting of the hollow plunger 6, the adjustment sleeve 7, and the adjustment knob 8. After rotating the adjustment knob 8, the gear 81 on the knob meshes with the rack 71 on the adjustment sleeve 7, which drives the adjustment sleeve 7 to move forward and backward on the hollow plunger 6, thereby controlling the return flow of the hydraulic oil 9 and thus changing the pump flow rate.

[0066] Specifically, the working principle of the spiral groove hydraulic diaphragm metering pump designed in Embodiment 1 above is as follows: After the motor 60 is reduced in speed by the reducer 80, the output torque drives the main shaft 50 to rotate in the housing 20. The spiral groove 501 on the main shaft 50 can push the pin 40 (slide rod 30) forward. When the rotation angle of the main shaft 50 is between 0 and 180°, the slide rod 30 can perform a lifting motion (forward movement). When the rotation angle of the main shaft 50 is between 180 and 360°, the slide rod 30 performs a lowering motion (backward movement). When the main shaft 50 rotates one revolution (0 to 360°), the slide rod 30 reciprocates once. During the forward and backward reciprocating motion of the slide rod 30, due to the restriction effect of the guide pin 70 and the guide groove 302, the slide rod 30 can be prevented from rotating and swaying with the main shaft 50, thus maintaining that it can only perform forward and backward linear reciprocating motion.

[0067] During the operation of the metering pump, when the hollow plunger 6 moves backward under the drive of the slide rod 30, the volume of the medium chamber 11 and the hydraulic chamber 21 increases, forming a negative pressure. This causes the discharge check valve 13 to close and the suction check valve 12 to open, allowing the fluid medium to be drawn into the medium chamber 11. When the hollow plunger 6 reaches the rear dead center, the suction process ends. When the hollow plunger 6 moves forward, the volume of the hydraulic chamber 21 and the medium chamber 11 decreases, forming a positive pressure. This causes the discharge check valve 13 to open and the suction check valve 12 to close, allowing the medium to be discharged through the discharge check valve 13. When the hollow plunger 6 reaches the front dead center, the discharge process ends. This cycle repeats continuously, and the medium is continuously discharged.

[0068] Flow regulation principle: When the adjustment knob 8 is rotated, the adjustment sleeve 7 can move forward under the action of gear 82 and rack 71. At this time, the distance between the adjustment sleeve 7 and the return hole 62 increases. During the forward movement of the hollow plunger 6, more hydraulic oil in the hydraulic chamber 21 will enter the cavity 51 through the return hole 62. This is equivalent to an increase in the bypass flow of hydraulic oil 9, so the flow rate of the discharged medium will decrease accordingly. When the adjustment knob 8 is rotated in the opposite direction, the adjustment sleeve 7 moves backward. At this time, the distance between the adjustment sleeve 7 and the return hole 62 decreases. Therefore, during the forward movement of the hollow plunger 6, the amount of hydraulic oil 9 entering the cavity 51 through the return hole 62 in the hydraulic chamber 21 decreases. This is equivalent to a decrease in the bypass flow of hydraulic oil 9, so the flow rate of the discharged medium will increase accordingly. When the adjusting sleeve 7 is adjusted to the front dead center, the distance is at its maximum. When the hollow plunger 6 moves forward, the hydraulic oil 9 in the hydraulic chamber 21 returns to the hollow chamber 51 through the return hole 62. At this time, the bypass circulation of the hydraulic oil 9 is fully open, and the flow rate of the discharged medium is zero. When the adjusting sleeve 7 is adjusted to the rear dead center, the distance is zero, that is, the return hole 62 is blocked by the adjusting sleeve 7. When the hollow plunger 6 moves forward, all the hydraulic oil 9 enters the hydraulic chamber 21, and the flow rate of the discharged medium can reach its maximum value. The forward and backward movement of the adjusting sleeve 7 is stepless and continuous. Therefore, the metering pump of this invention can steplessly adjust the flow rate within the rated flow range.

[0069] The flow rate adjustment structure of the hollow plunger 6 and the flow adjustment sleeve 7 can be adjusted by rotating the flow adjustment knob 8 and using the transmission of gear 81 and rack 71 to move the flow adjustment sleeve 71 forward and backward, thereby changing the effective stroke of the hollow plunger 6 and achieving the purpose of flow adjustment.

[0070] The above-described preferred embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of this utility model. Any obvious variations or modifications derived from the technical solutions of this utility model are still within the protection scope of this utility model.

Claims

1. A spiral groove hydraulic diaphragm metering pump, characterized in that, The metering pump consists of a hydraulic unit and a power unit; The hydraulic unit includes the following structural configuration: The pump head (1) has a medium chamber (11) inside, and is also provided with an inlet check valve (12) and a drain check valve (13) communicating with the medium chamber (11); A hydraulic cylinder body (2) is provided inside, and the hydraulic cylinder body (2) is connected to the pump head (1); A diaphragm (3) is disposed between the pump head (1) and the hydraulic cylinder (2) to separate the medium chamber (11) from the hydraulic chamber (21); A release valve (4) is provided on the hydraulic cylinder body (2) and is also connected to the hydraulic chamber (21); A connecting body (5) has a cavity (51) inside. The connecting body (5) is connected to the hydraulic cylinder body (2). A plunger hole (52) is provided on it to connect the hydraulic cavity (21) and the cavity (51). A slide rod hole (53) is also provided on one end of the connecting body (5) opposite to the plunger hole (52). A hollow plunger (6) is disposed in the cavity (51). The hollow plunger (6) has a hollow groove (61) with one end open inside. A plurality of reflux holes (62) communicating with the hollow groove (61) are arranged around the outer wall of the hollow plunger (6). One end of the hollow plunger (6) is also slidably disposed in the plunger hole (52) and forms a precise clearance fit with it. The hollow groove (61) is connected to the hydraulic cavity (21). Adjustable sliding sleeve (7) is slidably sleeved on the outer wall of the hollow plunger (6); And a volume adjustment knob (8), which is rotatably mounted on the connecting body (5) to adjust the distance between the volume adjustment sleeve (7) and the return hole (62), and the cavity (51) is filled with hydraulic oil (9) that submerges the hollow plunger (6); The power unit is connected to one end of the connector (5) having a slide hole (53), and is also connected to the hollow plunger (6) to drive the hollow plunger (6) to slide back and forth in the plunger hole (52).

2. The spiral groove hydraulic diaphragm metering pump according to claim 1, characterized in that, The hydraulic unit also includes a buffer valve (10), which is disposed in the hydraulic chamber (21) to reduce the impact of the hydraulic oil (9) on the diaphragm (3).

3. The spiral groove hydraulic diaphragm metering pump according to claim 1, characterized in that, The connector (5) is also provided with a cover plate (54).

4. The spiral groove hydraulic diaphragm metering pump according to claim 1, characterized in that, The reflux hole (62) is located close to the bottom of the hollow groove (61).

5. A spiral groove hydraulic diaphragm metering pump according to claim 1, characterized in that, The adjustable sliding sleeve (7) is provided with a rack (71), the adjustable knob (8) is provided with a gear (81) that meshes with the rack (71), and the adjustable knob (8) is also provided with an adjustment scale (82).

6. A spiral groove hydraulic diaphragm metering pump according to claim 1 or 5, characterized in that, The connector (5) is also provided with a locking handle (55), which is used to lock the adjustment knob (8) onto the connector (5) and restrict its rotation.

7. A spiral groove hydraulic diaphragm metering pump according to claim 1, characterized in that, The power unit includes the following structural configuration: The housing (20) has an assembly cavity (201) inside, which is connected to the connector (5), and the slide hole (53) connects the cavity (51) and the assembly cavity (201); A slide rod (30) has one end passing through the slide rod hole (53) and connected to the end of the hollow plunger (6), and a precise clearance fit is formed between the slide rod (30) and the slide rod hole (53). The other end extends into the assembly cavity (201) and is also provided with an open slot (301). Several pins (40) are respectively disposed on the slide bar (30) and one end extends into the slot (301); A main shaft (50) is rotatably disposed in the housing (20), and a closed spiral groove (501) is obliquely disposed around its surface. One end of the main shaft (50) is inserted into the slot (301). The pin (40) is slidably engaged with the spiral groove (501). After the main shaft (50) rotates, it drives the slide rod (30) to slide back and forth in the slide rod hole (53). And a motor (60), which is connected to the other end of the main shaft (50) for driving the main shaft (50) to rotate.

8. A spiral groove hydraulic diaphragm metering pump according to claim 7, characterized in that, A guide groove (302) is provided on the outer wall of the end of the slide rod (30), and a guide pin (70) is provided on the housing (20). The guide pin (70) slides in cooperation with the guide groove (302) to limit the slide rod (30) from rotating with the main shaft (50).

9. A spiral groove hydraulic diaphragm metering pump according to claim 7, characterized in that, The power unit also includes a speed reducer (80), and the motor (60) is connected to the main shaft (50) through the speed reducer (80).

10. A spiral groove hydraulic diaphragm metering pump according to claim 7, characterized in that, The hollow plunger (6) and the slide rod (30) are respectively provided with a first chuck (63) and a second chuck (303). After the first chuck (63) and the second chuck (303) are connected, they are clamped by a retaining ring (100) to realize the connection and fixation between the hollow plunger (6) and the slide rod (30). The first chuck (63) and the second chuck (303) are respectively provided with a first inclined surface, and the retaining ring (100) is provided with a second inclined surface that cooperates with the first inclined surface, so as to achieve precise docking of the first chuck (63) and the second chuck (303).

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