CN219558250U - Accurate liquid pump of joining in marriage of dialysis machine - Google Patents
Accurate liquid pump of joining in marriage of dialysis machine Download PDFInfo
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- CN219558250U CN219558250U CN202320753834.4U CN202320753834U CN219558250U CN 219558250 U CN219558250 U CN 219558250U CN 202320753834 U CN202320753834 U CN 202320753834U CN 219558250 U CN219558250 U CN 219558250U
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Abstract
An accurate liquid distribution pump of a dialysis machine belongs to the technical field of liquid distribution pumps of hemodialysis machines. The liquid dispensing pump in the prior art is extremely easy to be out of alignment, or the situation that liquid cannot be fed and pumped out occurs. The utility model comprises a pump body, a water inlet, a water outlet, a plunger body and a screw transmission system; a liquid inlet cavity for accommodating a plunger body is arranged in the pump body, the plunger body is arranged in the liquid inlet cavity in a sliding manner, and the plunger body is connected with a screw rod transmission system; one end of the liquid inlet cavity is communicated with the water inlet and the water outlet, the water inlet and the water outlet are respectively provided with a one-way valve, the passage direction of the water inlet faces the liquid inlet cavity, and the passage direction of the water outlet is far away from the liquid inlet cavity. The liquid preparation precision is high, the use is more convenient and reliable, the whole structure is simple, and the preparation cost is lower.
Description
Technical Field
An accurate liquid distribution pump of a dialysis machine belongs to the technical field of liquid distribution pumps of hemodialysis machines.
Background
The utility model relates to the technical field of hemodialysis, which is to draw out the blood of a patient to the outside of the body and remove pathogenic components in the blood so as to lead the blood of the patient to reach the standard of healthy blood. Dialysate is an important component of hemodialysis, which exchanges with substances of the blood system, and is used for improving the components of the blood system, eliminating toxins and other metabolites in the body, and correcting the water, electrolyte and acid-base balance in the body of a patient. The basic components of the dialysate are sodium, potassium, calcium, magnesium, chlorine, alkaline agent and glucose, and as sodium bicarbonate is in contact with calcium chloride and magnesium chloride to easily form calcium carbonate and magnesium carbonate precipitates, alkali liquor and acid liquor are required to be prepared for the dialysate respectively to prevent the formation of precipitates, and at present, independent finished products of solution A and solution B exist. When in use, accurate liquid preparation is needed to obtain proper dialysate.
Patent CN101439207B discloses a plunger metering pump for purifying blood, which supplies water into a horizontal through hole 13a by using a water inlet joint 9, then discharges water under pressure to the opposite end, the plunger body 12 supplies pressure to be extruded into a water channel (the horizontal through hole 13 a) in a manner perpendicular to the water channel, the actual output pressure direction provided by the plunger body 12 of the structure is perpendicular to the water flow output direction, thus leading to lower output pressure, and when the liquid amount supplied into the horizontal through hole 13a by the water inlet joint 9 is insufficient to fill the whole horizontal through hole 13a, the discharge end is possibly only the upper air, thus leading to liquid distribution misalignment and whole dialysate failure; and the continued air pressure in the horizontal through hole 13a further makes it difficult for the water inlet joint 9 to supply liquid into the horizontal through hole 13a, and the complete stop of the emptying and recycling is required.
Disclosure of Invention
The technical problems to be solved by the utility model are as follows: overcomes the defects of the prior art, and provides a dialysis machine accurate liquid distribution pump with accurate liquid distribution, convenient control, simple structure and low error rate.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides a accurate liquid pump of joining in marriage of dialysis machine which characterized in that: comprises a pump body, a water inlet, a water outlet, a plunger body and a screw transmission system; a liquid inlet cavity for accommodating a plunger body is arranged in the pump body, the plunger body is arranged in the liquid inlet cavity in a sliding manner, and the plunger body is connected with a screw rod transmission system; one end of the liquid inlet cavity is communicated with the water inlet and the water outlet, the water inlet and the water outlet are respectively provided with a one-way valve, the passage direction of the water inlet faces the liquid inlet cavity, and the passage direction of the water outlet is far away from the liquid inlet cavity.
The plunger body is driven by the screw rod transmission system to realize reciprocating motion in the liquid inlet cavity. Compared with devices such as eccentric wheels, the screw transmission system is more accurate in control, and the screw is more convenient to control by rotating the screw through the power device. When the plunger body is drawn out from the liquid inlet cavity, internal negative pressure is generated, liquid is drawn into the liquid inlet cavity from the water inlet, the liquid outlet is sealed, and when the plunger body enters the liquid inlet cavity, internal positive pressure is generated, and the liquid is discharged from the water outlet, so that liquid is fed and discharged. The main pressure in each liquid inlet process comes from the negative pressure in the liquid inlet cavity, and the liquid inlet is simply supplied with pressure, so that the liquid outlet can be effectively sealed, the liquid can be pumped in from the liquid inlet, and the liquid at the liquid inlet can be prevented from being unable to enter the liquid inlet cavity; the plunger pump can completely squeeze the liquid inlet cavity in each liquid outlet process, so that the liquid in the liquid inlet cavity is completely discharged, the liquid outlet amount in each time can be ensured to be the squeeze space of the plunger body, the liquid inlet and outlet amount is accurately controlled, and the precision is higher; the movement distance of the plunger body is controlled to control the liquid inlet and outlet amount, so that the use is more convenient; the whole structure is simpler, and the preparation cost is lower.
Preferably, the water inlet comprises a water inlet shell, a water inlet plug and an elastic supporting device, a reducing structure for accommodating the water inlet plug is arranged between the water inlet shell and the pump body, the diameter of one side of the reducing structure, which is close to the liquid inlet cavity, is larger than that of the other side, the water inlet plug is arranged between a passage of the water inlet shell and the liquid inlet cavity in a sliding manner, the elastic supporting device is arranged between the water inlet plug and the pump body, and the water inlet plug is in clearance fit with the pump body.
The water inlet plug slides in the reducing structure and is matched with the elastic supporting device to form a one-way valve, and the one-way valve automatically resets and closes or opens the passage under the action of pressure.
Further preferably, the elastic supporting device is a spring, a spring groove is arranged on the pump body corresponding to the water inlet, the spring is arranged in the spring groove, and the spring groove is respectively communicated with the liquid inlet cavity and the water inlet shell.
Preferably, the water outlet comprises a water outlet shell, a water outlet plug and an elastic pressing device; the water outlet shell is communicated with the liquid inlet cavity, and a passage from the water outlet shell to the liquid inlet cavity is provided with a reducing structure, wherein the diameter of one side of the reducing structure far away from the liquid inlet cavity is larger than that of the other side; the water outlet plug and the elastic pressing device are arranged in the reducing structure, and the passage from the water outlet shell to the liquid inlet cavity is closed.
The diameter-variable structure, the water outlet plug and the elastic pressing device are matched to form an automatic closed passage or open the passage under the action of pressure.
Further preferably, a water outlet cavity is arranged on the pump body, one end of the water outlet cavity is opened and communicated with the water outlet shell, the other end of the water outlet cavity is communicated with the liquid inlet cavity, the water outlet plug and the elastic pressing device are arranged in the water outlet cavity, and the water outlet plug seals the through hole of the water outlet cavity and is communicated with the liquid inlet cavity.
Further preferably, the elastic pressing device is a spring, and two ends of the spring are respectively connected with the water outlet plug and the pump body.
Preferably, the reciprocating device comprises a screw and a motor, wherein two ends of the screw are respectively connected with the motor and the plunger body, and the screw is arranged at one end of the plunger body far away from the water inlet and the water outlet.
Further preferably, the motor is a stepper motor.
Preferably, the side surface of the plunger body is provided with a shading sheet, and the pump body is provided with a corresponding photoelectric limit switch.
Compared with the prior art, the utility model has the following beneficial effects: the main pressure in each liquid inlet process comes from the negative pressure in the liquid inlet cavity, and the liquid inlet is simply supplied with pressure, so that the liquid outlet can be effectively sealed, the liquid can be pumped in from the liquid inlet, and the liquid at the liquid inlet can be prevented from being unable to enter the liquid inlet cavity; the plunger pump can completely squeeze the liquid inlet cavity in each liquid outlet process, so that the liquid in the liquid inlet cavity is completely discharged, the liquid outlet amount in each time can be ensured to be the squeeze space of the plunger body, the liquid inlet and outlet amount is accurately controlled, and the precision is higher; the movement distance of the plunger body is controlled to control the liquid inlet and outlet amount, so that the use is more convenient; the whole structure is simpler, and the preparation cost is lower.
Drawings
Fig. 1 is a schematic diagram of the internal structure of a precise liquid dispensing pump of a dialysis machine.
FIG. 2 is a schematic view of a water inlet structure.
Fig. 3 is a schematic view of the structure of the water outlet.
1, a water inlet; 2. a water outlet; 3. a plunger body; 4. a pump body; 5. a photoelectric limit switch; 6. a light shielding sheet; 7. a screw rod 8 and a stepping motor; 9. a liquid inlet cavity; 101. a water inlet housing; 102. a water inlet plug; 103. a water inlet spring; 201. a water outlet housing; 202. a water outlet plug; 203. a water outlet spring; 204. and a water outlet cavity.
Detailed Description
The utility model is further described below with reference to fig. 1 to 3.
Referring to fig. 1 to 3: the accurate liquid distribution pump of the dialysis machine comprises a water inlet 1, a water outlet 2, a plunger body 3, a pump body 4, a photoelectric limit switch 5, a shading sheet 6, a lead screw 7 and a stepping motor 8, wherein the water inlet 1 and the water outlet 2 are arranged at the same end of the pump body 4; a liquid inlet cavity 9 corresponding to the plunger body 3 is arranged in the pump body 4; the plunger body 3 is arranged in the liquid inlet cavity in a sliding way, one end of the plunger body 3 seals the liquid inlet cavity 9, the other end of the plunger body is connected with one end of the screw rod 7, and the other end of the screw rod 7 is connected with the stepping motor 8; one side of the plunger body 3 is provided with a shading sheet 6, and a photoelectric limit switch 5 is arranged on the pump body 4 corresponding to the shading sheet 6.
The water inlet 1 comprises a water inlet shell 101, a water inlet plug 102 and a water inlet spring 103, wherein the water inlet shell 101 is fixedly connected to the pump body 4, the water inlet plug 102 is arranged in the water inlet shell 101, and the water inlet plug 102 can completely seal the water inlet shell 101; a spring groove is formed in the pump body 4, which is close to one side of the liquid inlet cavity 9, of the water inlet plug 102, and the water inlet plug 102 is in clearance fit with the spring groove, so that the water inlet plug 102 can move to open a water inlet channel to a certain extent; the spring groove is communicated with the liquid inlet cavity 9; the water inlet spring 103 is arranged in the spring groove; the water inlet 1 is externally connected with a water inlet pipeline.
The water outlet 2 comprises a water outlet shell 201, a water outlet plug 202 and a water outlet spring 203, and the water outlet shell 201 is fixedly connected to the pump body 4; a water outlet cavity 204 is arranged on the pump body 4 at a position corresponding to the water outlet shell 201, one end of the water outlet cavity 204, which is close to the water outlet shell 201, is opened and communicated with the water outlet shell 201, and a water outlet plug 202 is arranged at the bottom in the water outlet cavity 204; the bottom of the water outlet cavity 204 is provided with a through hole communicated with the liquid inlet cavity 9; a water outlet spring 203 is arranged in the water outlet cavity 204, and two ends of the water outlet spring 203 are respectively connected with the water outlet plug 202 and the pump body 4; the water outlet spring 203 enables the water outlet plug 202 to close a through hole communicated with the liquid inlet cavity 9 at the bottom of the water outlet cavity 204.
The stepping motor 8 drives the plunger body 3 to reciprocate, when the plunger body 3 is pulled out of the liquid inlet cavity 9, the water inlet 1 moves to the liquid inlet cavity 9 by the water inlet plug 102 under suction pressure against the supporting force of the water inlet spring 103, and the liquid is supplied to the liquid inlet cavity by the water inlet 1 passage; while the water outlet 2 is blocked by the water outlet plug 202. When the plunger body 3 enters the liquid inlet cavity 9, the water outlet 2 overcomes the pressure of the water outlet spring 203 by the water outlet plug 202 under the action of the discharge pressure, and the liquid is output outwards through the water outlet 2 passage; while the water inlet 1 is plugged by a water inlet plug 102. The photoelectric limit switch 5 changes the forward and backward rotation of the stepping motor and accurately feeds back the in-out displacement of the plunger body 3 after the return signal is identified by the CPU through the shading sheet 6, so that the in-out liquid amount is accurately fed back, and the accurate control is realized.
The plunger body 3 is made of ceramic wear-resistant materials.
The above description is only a preferred embodiment of the present utility model, and is not intended to limit the utility model in any way, and any person skilled in the art may make modifications or alterations to the disclosed technical content to the equivalent embodiments. However, any simple modification, equivalent variation and variation of the above embodiments according to the technical substance of the present utility model still fall within the protection scope of the technical solution of the present utility model.
Claims (8)
1. The utility model provides a accurate liquid pump of joining in marriage of dialysis machine which characterized in that: comprises a pump body (4), a water inlet (1), a water outlet (2), a plunger body (3) and a screw transmission system; a liquid inlet cavity (9) for accommodating the plunger body (3) is arranged in the pump body (4), the plunger body (3) is arranged in the liquid inlet cavity (9) in a sliding manner, and the plunger body (3) is connected with a screw transmission system; one end of the liquid inlet cavity (9) is communicated with the water inlet (1) and the water outlet (2), and the water inlet (1) and the water outlet (2) are respectively provided with one-way valves;
the water inlet (1) include shell (101), water inlet stopper (102) and elastic support device, be equipped with the reducing structure that holds water inlet stopper (102) between shell (101) and the pump body (4), one side diameter that the reducing structure is close to feed liquor chamber (9) is greater than the opposite side, water inlet stopper (102) slide and set up between the passageway of shell (101) and feed liquor chamber (9), elastic support device sets up between water inlet stopper (102) and pump body (4), water inlet stopper (102) and pump body (4) clearance fit.
2. The dialysis machine precision liquid dispensing pump of claim 1, wherein: the elastic supporting device is a spring, a spring groove is formed in the pump body (4) corresponding to the water inlet (1), and the spring is arranged in the spring groove.
3. The dialysis machine precision liquid dispensing pump of claim 1, wherein: the water outlet (2) comprises a water outlet shell (201), a water outlet plug (202) and an elastic pressing device; the water outlet shell (201) is communicated with the liquid inlet cavity (9), and a passage from the water outlet shell (201) to the liquid inlet cavity (9) is provided with a reducing structure, wherein the diameter of one side of the reducing structure far away from the liquid inlet cavity (9) is larger than that of the other side; the water outlet plug (202) and the elastic pressing device are arranged in the reducing structure, and a passage from the water outlet shell (201) to the liquid inlet cavity (9) is closed.
4. The dialysis machine precision liquid dispensing pump of claim 3, wherein: be equipped with water outlet cavity (204) on pump body (4), water outlet cavity (204) one end opening and intercommunication play water casing (201), water outlet cavity (204) other end intercommunication feed liquor chamber (9), play water plug (202) and elasticity closing device set up in water outlet cavity (204) to water outlet plug (202) seal water outlet cavity (204) communicate to the through-hole of feed liquor chamber (9).
5. The dialysis machine precision liquid dispensing pump of claim 3, wherein: the elastic pressing device is a spring, and two ends of the spring are respectively connected with the water outlet plug (202) and the pump body (4).
6. The dialysis machine precision liquid dispensing pump of claim 1, wherein: the screw transmission system comprises a screw (7) and a motor, wherein two ends of the screw (7) are respectively connected with the motor and the plunger body (3), and the screw (7) is arranged at one end, far away from the water inlet (1) and the water outlet (2), of the plunger body (3).
7. The dialysis machine precision liquid dispensing pump of claim 6, wherein: the motor is a stepping motor.
8. The dialysis machine precision liquid dispensing pump of claim 1, wherein: the side of the plunger body (3) is provided with a shading sheet (6), and the pump body (4) is provided with a corresponding photoelectric limit switch (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320753834.4U CN219558250U (en) | 2023-04-07 | 2023-04-07 | Accurate liquid pump of joining in marriage of dialysis machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320753834.4U CN219558250U (en) | 2023-04-07 | 2023-04-07 | Accurate liquid pump of joining in marriage of dialysis machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219558250U true CN219558250U (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320753834.4U Active CN219558250U (en) | 2023-04-07 | 2023-04-07 | Accurate liquid pump of joining in marriage of dialysis machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219558250U (en) |
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2023
- 2023-04-07 CN CN202320753834.4U patent/CN219558250U/en active Active
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