A pressure pump structure

Abstract

The utility model relates to pump structure technical field, especially relate to a pressure pump structure, the inside of pump cover subassembly is provided with inner cavity and outer cavity, the outer cavity is communicated with the inner chamber of main cover body through the hole, the inside of main cover body is provided with umbrella nail, the rear cover water outlet hole that communicates with the inner cavity is provided on main cover body, the inlet pipe and outlet pipe are provided on pump cover subassembly, the outlet pipe is communicated with the inner cavity, the inlet pipe is communicated with the outer cavity, the inherent diaphragm positioning cover is provided on pump cover subassembly, main cover body is embedded into the positioning hole, the positioning convex strip that matches with positioning groove is provided on the surface of diaphragm positioning cover, positioning convex strip is embedded into the positioning groove. When using the utility model, positioning convex strip is embedded into the positioning groove after tower type diaphragm main part is clamped and fixed through pump cover subassembly and diaphragm positioning cover, make tower type diaphragm main part locate through pump cover subassembly and diaphragm positioning cover, reduce the risk of tower type diaphragm main part displacement, guarantee the stability of liquid supply.

Description

Technical Field

[0001] This utility model relates to the field of pump structure technology, and in particular to a pressure pump structure. Background Technology

[0002] As a miniaturized fluid control device with precise liquid delivery capabilities, micropumps have been widely used in fields with stringent requirements for liquid flow control precision, such as medical and health care (e.g., micro-drug infusion, in vitro diagnostic reagent delivery), electronic manufacturing (e.g., chip coolant circulation, electronic component cleaning fluid supply), and analytical instruments (e.g., chromatograph sample injection, environmental monitoring equipment reagent delivery), thanks to their core advantages of small size, low energy consumption, and high flow regulation accuracy.

[0003] The core operation of current mainstream micro pumps typically relies on the volume change of a tower-shaped diaphragm body to achieve liquid intake and discharge. Its typical working principle is as follows: The power mechanism (such as an electromagnetic drive assembly or a piezoelectric drive unit) acts on the tower-shaped diaphragm body through reciprocating driving force. When the power mechanism applies a pulling force to the tower-shaped diaphragm body, the internal volume of the diaphragm body increases, creating a negative pressure environment within the cavity. Under this negative pressure, the umbrella pin (one-way seal) at the inlet channel overcomes its own restoring elasticity or liquid resistance and leaves the inlet, opening the inlet channel. External liquid is then drawn into the internal cavity of the tower-shaped diaphragm body under the pressure difference. Subsequently, the power mechanism switches the direction of driving force, applying a squeezing force to the tower-shaped diaphragm body, reducing the internal volume of the diaphragm body and creating a positive pressure environment within the cavity. When the positive pressure in the cavity reaches a preset threshold, the central umbrella (one-way exhaust / venting) at the outlet channel... The liquid discharge seal is opened by the liquid pressure, the liquid outlet channel is opened, and the liquid in the inner cavity of the tower-shaped diaphragm body is discharged along the liquid outlet channel, completing one liquid transport cycle.

[0004] However, during the aforementioned operation, the pulling action of the power mechanism on the tower-shaped diaphragm body becomes a key weak link affecting the operational stability and liquid discharge accuracy of the micropump. In existing pump body structural designs, the connection between the tower-shaped diaphragm body and the pump body shell is usually achieved through edge bonding or simple snap-fit ​​limiting methods. The connection strength and positioning accuracy are difficult to match the pulling force requirements of the power mechanism: when the power mechanism applies a pulling force to the tower-shaped diaphragm body, the tower-shaped diaphragm body is prone to displacement along the direction of the pulling force, causing its fixed position relative to the shell to shift, that is, the tower-shaped diaphragm body is pulled away from the preset installation position on the shell.

[0005] The displacement of the tower-shaped diaphragm body will directly disrupt the preset movement trajectory of the tower-shaped bladder (i.e., the fluid-containing space formed by the inner cavity of the tower-shaped diaphragm body): the tower-shaped bladder, which should originally reciprocate along a fixed axis, will experience problems such as deviation in movement direction and uneven expansion and contraction amplitude due to the displacement of the diaphragm body; this deviation in movement trajectory will cause the actual volume change of the tower-shaped bladder to deviate from the design value (such as a decrease in the maximum intake volume and an increase in the minimum discharge volume), thereby causing fluctuations in the amount of liquid delivered in a single transaction. Utility Model Content

[0006] The purpose of this invention is to provide a pressure pump structure that addresses the shortcomings and deficiencies of existing technologies.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0008] The pressure pump structure described in this utility model includes a tower-shaped diaphragm body, a pump cover assembly, and an eccentric assembly for driving the tower-shaped diaphragm body to reciprocate; a main cover is provided on the tower-shaped diaphragm body;

[0009] The pump cover assembly has an inner cavity and an outer cavity. The outer cavity is connected to the inner cavity of the main cover through a small hole. An umbrella-shaped pin is located inside the main cover. A rear cover water outlet is located on the main cover and is connected to the inner cavity. The rear cover water outlet is directly opposite the umbrella-shaped pin. A central umbrella is located in the inner cavity opposite the rear cover water outlet. The pump cover assembly has an inlet pipe and an outlet pipe. The outlet pipe is connected to the inner cavity. The inlet pipe is connected to the outer cavity.

[0010] The tower-shaped diaphragm body is provided with a positioning groove; the pump cover assembly has a built-in diaphragm positioning cover; the diaphragm positioning cover is provided with a positioning hole; the main cover is embedded in the positioning hole; the surface of the diaphragm positioning cover is provided with a positioning protrusion that matches the positioning groove; the positioning protrusion is embedded in the positioning groove.

[0011] Furthermore, the number of main covers is three; the main covers are circumferentially distributed on the diaphragm positioning cover; and each main cover is connected to an eccentric assembly.

[0012] Furthermore, the pump cover assembly consists of a rear cover fixed to the diaphragm positioning cover and a front cover fixed to the rear cover; the inner cavity of the front cover is provided with a front cover ring; the inner cavity of the rear cover is provided with a rear cover ring; the front cover ring is pressed against the rear cover ring.

[0013] Furthermore, multiple rear cover strips are evenly distributed on the outer cavity.

[0014] Furthermore, a rear cover retaining ring is provided on the bottom surface of the rear cover; a connecting piece is provided on the tower-shaped diaphragm body; the main covers are all fixed on the connecting pieces; the rear cover retaining ring presses the connecting pieces against the surface of the diaphragm positioning cover; a rear cover spacer is provided between adjacent main covers; the rear cover spacer is fixed on the surface of the rear cover; the rear cover spacer presses the connecting pieces against the surface of the diaphragm positioning cover.

[0015] Furthermore, the positioning groove is arc-shaped.

[0016] With the above structure, the beneficial effects of this utility model are as follows: when positive pressure is generated inside the main cover, the umbrella nail seals on the fine hole, and the movable piece is pushed open. The liquid inside the main cover enters the inner cavity from the water outlet of the rear cover and is finally discharged through the liquid outlet pipe. After the tower-shaped diaphragm body is clamped and fixed by the pump cover assembly and the diaphragm positioning cover, the positioning protrusion is embedded in the positioning groove, so that the tower-shaped diaphragm body is positioned by the pump cover assembly and the diaphragm positioning cover, reducing the risk of displacement of the tower-shaped diaphragm body and ensuring the stability of liquid supply. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a structural diagram of the present invention after the protective cover has been removed;

[0019] Figure 3 This is a first-person perspective 3D view of the pump cover assembly;

[0020] Figure 4 This is a second-view perspective 3D view of the pump cover assembly;

[0021] Figure 5 This is a first-person perspective 3D view of the back cover;

[0022] Figure 6 This is a second-view 3D view of the back cover;

[0023] Figure 7 This is a first-person perspective 3D view of the main body of the tower-shaped diaphragm.

[0024] Figure 8 This is a second-view perspective stereoscopic view of the main body of the tower-shaped diaphragm.

[0025] Figure 9 This is a structural diagram of the diaphragm positioning cover;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Front cover; 101. Inlet pipe; 102. Outlet pipe; 103. Front cover ring; 2. Rear cover; 201. Fine hole; 202. Rear cover retaining strip; 203. Rear cover ring; 204. Rear cover cavity; 205. Rear cover retaining ring; 206. Rear cover spacer; 207. Rear cover water outlet; 3. Tower-shaped diaphragm body; 301. Main cover; 302. Positioning groove; 303. Connecting piece; 4. Diaphragm positioning cover; 401. Positioning hole; 402. Positioning protrusion; 5. Protective cover; 6. Motor; 7. Turntable; 8. Eccentric wheel; 9. Umbrella nail; 10. Central umbrella; 1001. Movable piece. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] like Figures 1 to 9 As shown, the pressure pump structure of this utility model includes a tower-shaped diaphragm body 3, a pump cover assembly, and an eccentric assembly for driving the tower-shaped diaphragm body 3 to reciprocate; a main cover 301 is provided on the tower-shaped diaphragm body 3;

[0030] The pump cover assembly has an inner cavity and an outer cavity. The outer cavity is connected to the inner cavity of the main cover 301 through a fine hole 201. An umbrella-shaped pin 9 is provided inside the main cover 301. A rear cover water outlet 207, connected to the inner cavity, is provided on the main cover 301. The rear cover water outlet 207 is directly opposite the umbrella-shaped pin 9. A central umbrella 10 is provided in the inner cavity at a position directly opposite the rear cover water outlet 207. The pump cover assembly has an inlet pipe 101 and an outlet pipe 102. The outlet pipe 102 is connected to the inner cavity. The inlet pipe 101 is connected to the outer cavity.

[0031] The tower-shaped diaphragm body 3 is provided with a positioning groove 302; the pump cover assembly has a built-in diaphragm positioning cover 4; the diaphragm positioning cover 4 is provided with a positioning hole 401; the main cover 301 is embedded in the positioning hole 401; the surface of the diaphragm positioning cover 4 is provided with a positioning protrusion 402 that matches the positioning groove 302; the positioning protrusion 402 is embedded in the positioning groove 302;

[0032] The tower-shaped diaphragm body 3 is not fundamentally different from the existing cup-shaped structure, so it will not be described in detail here;

[0033] The eccentric assembly is not fundamentally different from existing technologies, so it will not be described in detail. The eccentric assembly includes a motor 6, a turntable 7, and an eccentric wheel 8 fixed to the output end of the motor 6. The turntable 7 is connected to the eccentric position of the eccentric wheel 8. After the motor 6 drives the eccentric wheel 8 to rotate, the turntable 7 drives the main cover 301 to perform compression or stretching motion, thereby reducing or increasing the size of the inner cavity of the main cover 301. When the inner cavity of the main cover 301 increases, a negative pressure is generated inside the main cover 301. When the volume of the inner cavity of the main cover 301 decreases, the pressure inside the main cover 301 increases. A protective cover 5 is provided between the diaphragm positioning cover 4 and the motor 6 to protect the turntable 7 and the eccentric wheel 8.

[0034] The structure of the umbrella nail 9 is not fundamentally different from the existing technology, so it will not be described in detail. The umbrella head of the umbrella nail 9 is set inside the main cover 301. The umbrella head of the umbrella nail 9 can undergo elastic deformation. The main body of the central umbrella 10 is fixed on the pump cover assembly, and the movable piece 1001 of the central umbrella 10 is attached to the water outlet 207 of the rear cover. Both the umbrella nail 9 and the movable piece 1001 are made of rubber material. The umbrella rod of the umbrella nail 9 is fixed on the pump cover assembly. A negative pressure is generated in the volume inside the main cover 301, and the umbrella nail 9 leaves from the end face of the fine hole 201. The central umbrella 10 is attached to the water outlet 207 of the rear cover. The liquid enters the inner cavity of the main cover 301 in sequence from the liquid inlet pipe, the outer cavity and the fine hole 201.

[0035] When positive pressure is generated inside the main cover 301, the umbrella nail 9 seals the fine hole 201, and the movable piece 1001 is pushed open. The liquid inside the main cover 301 enters the inner cavity from the rear cover water outlet 207 and is finally discharged through the liquid outlet pipe 102.

[0036] After the tower-shaped diaphragm body 3 is clamped and fixed by the pump cover assembly and the diaphragm positioning cover 4, the positioning protrusion 402 is embedded in the positioning groove 302, so that the tower-shaped diaphragm body 3 is positioned by the pump cover assembly and the diaphragm positioning cover 4, reducing the risk of displacement of the tower-shaped diaphragm body 3 and ensuring the stability of liquid supply.

[0037] In a preferred embodiment of this utility model, the number of main cover bodies 301 is three; the main cover bodies 301 are circumferentially distributed on the diaphragm positioning cover 4; each main cover body 301 is connected to an eccentric assembly; when the same eccentric assembly rotates, it drives the three main cover bodies 301 to move sequentially. One rotation of the eccentric assembly completes one volume increase and one volume decrease process for each of the three main cover bodies 301, thereby improving the efficiency of the pressure pump; the number of cover outlet holes 207 and movable plates 1001 is also three.

[0038] In a preferred embodiment of this utility model, the pump cover assembly comprises a rear cover 2 fixed to the diaphragm positioning cover 4 and a front cover 1 fixed to the rear cover 2; the inner cavity of the front cover 1 is provided with a front cover ring 103; the inner cavity of the rear cover 2 is provided with a rear cover ring 203; the front cover ring 103 is pressed against the rear cover ring 203; through the cooperation of the front cover ring 103 and the rear cover ring 203, a sealing line is formed, so that the pump cover assembly forms an inner cavity and an outer cavity; the outer side of the front cover ring 103 is the outer cavity, and the inner side of the front cover ring 103 is the inner cavity; the pump cover assembly is assembled by bolts to combine the rear cover 2 and the front cover 1 into one piece, which is convenient for assembly.

[0039] As a preferred embodiment of this utility model, multiple back cover baffles 202 are evenly distributed on the outer cavity; the two ends of the back cover baffles 202 extend to the outer side wall of the back cover 2 and the outer side wall of the back cover ring 203 respectively; by setting multiple back cover baffles 202, the strength of the back cover 2 is enhanced.

[0040] In a preferred embodiment of this utility model, a rear cover retaining ring 205 is provided on the bottom surface of the rear cover 2; a connecting piece 303 is provided on the tower-shaped diaphragm body 3; the main cover bodies 301 are all fixed on the connecting pieces 303; the rear cover retaining ring 205 presses the connecting pieces 303 tightly onto the surface of the diaphragm positioning cover 4; a rear cover spacer 206 is provided between adjacent main cover bodies 301; the rear cover spacer 206 is fixed on the surface of the rear cover 2; the rear cover spacer 206 presses the connecting pieces 303 tightly onto the surface of the diaphragm positioning cover 4;

[0041] The two adjacent rear cover spacers 206 and the rear cover retaining ring 205 form a rear cover cavity 204; the rear cover cavity 204 is connected to the inner cavity of the main cover 301;

[0042] The main cover 301 is pressed onto the diaphragm positioning cover 4 by the rear cover retaining ring 205 and the rear cover spacer 206, thereby achieving the clamping and fixing of the tower-shaped diaphragm body 3 between the rear cover 2 and the diaphragm positioning cover 4, and further reducing the risk of deformation of the tower-shaped diaphragm body 3.

[0043] In a preferred embodiment of this utility model, the positioning groove 302 is in the shape of an arc.

[0044] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made to the structure, features and principles described in the claims of the present utility model patent application are included in the scope of the present utility model patent application.

Claims

1. A pressure pump structure, comprising a tower-shaped diaphragm body (3), a pump cover assembly, and an eccentric assembly for driving the tower-shaped diaphragm body (3) to reciprocate; a main cover (301) is provided on the tower-shaped diaphragm body (3). The pump cover assembly has an inner cavity and an outer cavity. The outer cavity is connected to the inner cavity of the main cover (301) through a small hole (201). The main cover (301) has an umbrella nail (9) inside. The main cover (301) has a rear cover water outlet (207) that is connected to the inner cavity. The rear cover water outlet (207) is directly opposite to the umbrella nail (9). The inner cavity has a central umbrella (10) at a position directly opposite the rear cover water outlet (207). The pump cover assembly has an inlet pipe (101) and an outlet pipe (102). The outlet pipe (102) is connected to the inner cavity. The inlet pipe (101) is connected to the outer cavity. Its features are: The tower-shaped diaphragm body (3) is provided with a positioning groove (302); the pump cover assembly has a built-in diaphragm positioning cover (4); the diaphragm positioning cover (4) is provided with a positioning hole (401); the main cover (301) is embedded in the positioning hole (401); the surface of the diaphragm positioning cover (4) is provided with a positioning protrusion (402) that matches the positioning groove (302); the positioning protrusion (402) is embedded in the positioning groove (302).

2. The pressure pump structure according to claim 1, characterized in that: The number of main covers (301) is three; the main covers (301) are distributed circumferentially on the diaphragm positioning cover (4); the main covers (301) are all connected to the eccentric assembly.

3. The pressure pump structure according to claim 1, characterized in that: The pump cover assembly consists of a rear cover (2) fixed on the diaphragm positioning cover (4) and a front cover (1) fixed on the rear cover (2); the inner cavity of the front cover (1) is provided with a front cover ring (103); the inner cavity of the rear cover (2) is provided with a rear cover ring (203); the front cover ring (103) is pressed against the rear cover ring (203).

4. The pressure pump structure according to claim 3, characterized in that: Multiple rear cover strips (202) are evenly distributed on the outer cavity.

5. The pressure pump structure according to claim 3, characterized in that: The bottom surface of the rear cover (2) is provided with a rear cover retaining ring (205); the tower-shaped diaphragm body (3) is provided with a connecting piece (303); the main cover (301) is fixed on the connecting piece (303); the rear cover retaining ring (205) presses the connecting piece (303) against the surface of the diaphragm positioning cover (4); a rear cover spacer (206) is provided between adjacent main cover bodies (301); the rear cover spacer (206) is fixed on the surface of the rear cover (2); the rear cover spacer (206) presses the connecting piece (303) against the surface of the diaphragm positioning cover (4).

6. The pressure pump structure according to claim 1, characterized in that: The positioning groove (302) is arc-shaped.

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