A pump head and a pump valve integrated structure comprising the same

Abstract

The application relates to a pump head and a pump valve integrated structure comprising the pump head, and the pump head comprises an upper cover, a diaphragm seat and a double-function valve sheet, the upper cover is formed with an output flow path and a pressure relief flow path, the diaphragm seat is formed with a suction flow path, a discharge flow path and a stop relief flow path, the double-function valve sheet is arranged between the upper cover and the diaphragm seat, the double-function valve sheet is provided with a suction one-way valve sheet, a discharge check valve sheet and a valve function sheet, the functions of the pump valve integration are realized in the three-layer structure of the upper cover, the diaphragm seat and the diaphragm seat, the flow path structure is optimized, a new flow path is designed, the performance reliability of the pump valve integrated structure can be changed, the double-function valve sheet is closed when pumping fluid into a working cavity, the double-function valve sheet is opened when deflating, the pump valve double-function reliability is realized, and the required performance of products is met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pump valves, in particular to a pump head and a pump valve integrated structure comprising the pump head. BACKGROUND

[0002] In the application of fluid pumps, there is an application that needs to pump fluid into a sealed working cavity to make the working cavity have a certain internal pressure. After the pressure in the working cavity reaches the preset target and the corresponding action is completed, the working cavity needs to be depressurized. For example, in the common scene of a sphygmomanometer, the cuff needs to be inflated first, and after the cuff is inflated and reaches a certain air pressure, the sphygmomanometer measures blood pressure through the cuff. After the blood pressure measurement is completed, the cuff needs to be depressurized.

[0003] In related technical means, in order to ensure that the fluid pump has an automatic depressurization function, a depressurization valve is often integrated on the fluid pump. The flow path of the seen patents and current products is: three things are done on one flow path channel: pumping fluid into a sealed space, the fluid simultaneously pumps fluid into the valve in the forward direction to block the pressure relief port, and after the pump is powered off, the fluid pumps fluid into the valve in the reverse direction to open the pressure relief port; but because the fluid is on the same channel, the fluid can flow to the valve in the forward direction and can affect the valve in the reverse direction to open the pressure relief port; the closing and opening of the valve completely depend on the pressure difference of the fluid acting on the valve in the forward and reverse directions on the channel, but the pressure difference is formed on one flow path, so it is difficult to stabilize; the pump valve dual function requires the valve to be tightly closed when pumping fluid, otherwise it is impossible to pump out stable fluid when pumping fluid; the pump valve dual function requires the valve to be opened when the pressure is released, otherwise it is impossible to release stable fluid when the pressure is released.

[0004] However, this simple integration method, because the flow channels of the pump valve integrated dual function fluid pump are related to each other, it is difficult to achieve that the valve is closed when the pump is working and the valve is opened when the pump is depressurized, especially the reliability is not easy to achieve, so the performance reliability of the pump valve integrated dual function fluid pump is the current main technical problem. SUMMARY

[0005] In order to improve the performance reliability of the pump valve integrated dual function fluid pump, the present application provides a pump head and a pump valve integrated structure comprising the pump head.

[0006] The pump head and the pump valve integrated structure provided by the present application adopt the following technical solutions:

[0007] In a first aspect, the present application provides a pump head, which adopts the following technical solutions:

[0008] A pump head comprises:

[0009] An upper cover is formed with an output flow path for communicating with the working chamber and a pressure relief flow path in selective communication with the output flow path;

[0010] A diaphragm seat is formed with an intake flow path, an exhaust flow path, and a pressure relief flow path, the intake flow path, the exhaust flow path, and the output flow path are unidirectionally communicated along a working direction;

[0011] A dual-function valve disc is arranged between the upper cover and the diaphragm seat, and is provided with an intake check valve disc, an exhaust check valve disc, and a valve function disc; the intake check valve disc unidirectionally communicates the intake flow path and the exhaust flow path along the working direction, the direction of the intake flow path towards the pressure relief flow path is a pressure relief direction, and the intake check valve disc unidirectionally communicates the intake flow path and the pressure relief flow path along the pressure relief direction; the exhaust check valve disc unidirectionally communicates the exhaust flow path and the output flow path along the working direction; and the valve function disc selectively communicates the output flow path and the pressure relief flow path.

[0012] By adopting the above technical scheme, the fluid has two flow paths in the pump head, the first path is that the fluid enters the working chamber through the intake flow path, the exhaust flow path, and the output flow path, wherein the intake check valve disc unidirectionally communicates the intake flow path and the exhaust flow path along the working direction, and the working direction refers to that the fluid is unidirectionally transported along the intake flow path, the exhaust flow path, and the output flow path to the working chamber; the second path is that the fluid enters the pressure relief flow path from the intake flow path along the pressure relief direction, and when the fluid is continuously transported into the working chamber, the pressure in the working chamber gradually increases. In order to make the pressure in the working chamber reach a preset target, the pressure of the fluid transported by the pump head to the working chamber gradually increases, so that the pressure in the pressure relief flow path also gradually increases. The valve function disc selectively communicates the output flow path and the pressure relief flow path, and the selective communication refers to that when the pressure of the fluid transported by the pump head to the working chamber is greater than the pressure of the fluid in the working chamber, the valve function disc blocks the output flow path and the pressure relief flow path; and when the pressure of the fluid transported by the pump head to the working chamber is less than the pressure of the fluid in the working chamber, the valve function disc communicates the output flow path and the pressure relief flow path, thereby completing the pressure relief action. Compared with simply integrating a pressure relief valve on the fluid pump, the pump valve integrated function is realized in the three-layer structure of the upper cover, the diaphragm seat, and the diaphragm seat, the flow path structure is optimized, a new flow path is designed, the performance reliability of the pump valve integrated structure can be changed, the dual-function valve disc is closed when pumping the fluid into the working chamber, and the dual-function valve disc is opened when deflating, the pump valve dual-function reliability is realized, and the required performance of the product is met.

[0013] Optionally, the upper cover is provided with an output nozzle for inputting fluid to the working chamber and a pressure relief nozzle for discharging fluid from the working chamber, the output flow path is formed in the output nozzle, and the pressure relief flow path is formed in the pressure relief nozzle; when the fluid flows in the working direction, the valve function piece abuts against the pressure relief nozzle and blocks the output flow path from the pressure relief flow path; when the pump head stops conveying fluid, the fluid flows from the output flow path to the discharge check valve piece, the discharge check valve piece blocks the discharge flow path from the output flow path, the valve function piece is separated from the pressure relief nozzle, and the output flow path is communicated with the pressure relief flow path.

[0014] By adopting the technical scheme, in the process that the fluid is transported to the working chamber along the suction flow path, the discharge flow path and the output flow path in one direction, when the fluid flows in the working direction, the pressure of the fluid conveyed by the pump head to the working chamber is greater than the pressure of the fluid in the working chamber, so that the valve function piece abuts against the pressure relief nozzle, and the valve function piece blocks the output flow path from the pressure relief flow path; when the pump head stops conveying fluid, the pressure of the fluid conveyed by the pump head to the working chamber is less than the pressure of the fluid in the working chamber, the fluid flows from the output flow path to the discharge check valve piece, the discharge check valve piece blocks the discharge flow path, the fluid in the output flow path changes the valve function piece from the state of abutting against the pressure relief nozzle to the state of separating from the pressure relief nozzle, so that the valve function piece communicates the output flow path with the pressure relief flow path, thereby realizing the pump-valve integrated function.

[0015] Optionally, the pressure relief flow path comprises a pressure relief channel formed in the diaphragm seat, the pressure relief channel is provided with a valve function cavity towards the side where the double-function valve piece is located, the valve function piece seals the open end face of the valve function cavity towards the side where the double-function valve piece is located, the valve function piece is elastic, and the pressure of the fluid in the valve function cavity controls the abutment or separation of the valve function piece and the pressure relief nozzle.

[0016] By adopting the technical scheme, the pressure relief channel is provided with the valve function cavity towards the side where the double-function valve piece is located, the valve function piece seals the open end face of the valve function cavity towards the side where the double-function valve piece is located, compared with the volume of the pressure relief channel, the valve function cavity can increase the space between the valve function piece, so that more fluid can fill the valve function cavity, thereby the fluid has a more sufficient acting area on the valve function piece, and the opening and closing function of the valve function piece is more stable.

[0017] Optionally, the valve function cavity has the same outer shape as the valve function piece, and the valve function cavity is aligned with the valve function piece.

[0018] By adopting the technical scheme, the outer shape contour of the valve function cavity is the same as that of the valve function sheet, and the valve function cavity and the valve function sheet are aligned with each other, so that the fluid entering the valve function cavity is uniformly distributed on the side of the valve function sheet close to the pump body, when the pressure of the fluid delivered by the pump head to the working capsule cavity is greater than the pressure of the fluid in the working capsule cavity, the valve function sheet is subjected to more uniform fluid pressure, and the deformation of the valve function sheet is also more uniform, thereby ensuring that the state of the valve function sheet being pressed against the pressure relief nozzle is more stable.

[0019] Optionally, the suction flow path includes a suction passage formed on the diaphragm seat away from the side where the double-function valve sheet is located and a suction hole penetrating through the diaphragm seat, the suction passage communicates with the suction hole; the discharge flow path includes a discharge passage formed on the diaphragm seat close to the side where the double-function valve sheet is located, and the suction hole unidirectionally communicates with the discharge passage and the pressure relief passage, respectively.

[0020] By adopting the technical scheme, the fluid enters the suction hole through the suction passage, the suction hole and the discharge passage and the pressure relief passage are unidirectionally communicated, and the pump body and the double-function valve sheet cooperate to form two functional flow channels. Compared with simply integrating a pressure relief valve on a fluid pump, the technical scheme greatly optimizes the flow path structure, thereby greatly reducing the volume and improving the applicability of the pump head, so that the pump head has more application scenarios.

[0021] Optionally, the double-function valve sheet is provided with a flow guide boss on the side facing the pump head, and the flow guide boss is provided with a flow guide channel for guiding the fluid in the output flow path to the pressure relief flow path.

[0022] By adopting the technical scheme, the flow guide boss is provided with the flow guide channel, which can guide the fluid in the output flow path to the pressure relief flow path during the pressure relief process of the working capsule cavity, thereby improving the situation that turbulence occurs at the junction position of the output flow path and the pressure relief flow path, and improving the running stability of the pump head.

[0023] In a second aspect, the application provides a pump valve integrated structure, which adopts the following technical scheme:

[0024] A pump valve integrated structure includes the above-mentioned pump head, and the pump valve integrated structure further includes:

[0025] The pump body comprises a diaphragm seat and a cup capsule, the diaphragm seat is installed on the side of the diaphragm seat away from the upper cover, the cup capsule is installed between the diaphragm seat and the diaphragm seat, and the diaphragm seat is formed with a fluid inlet channel for fluid entering the suction channel; the cup capsule has a movable capsule cavity and an inlet one-way valve piece, the movable capsule cavity is used for connecting the suction channel and the suction hole, the inlet one-way valve piece is attached to the opening end surface of the suction hole on the side facing the diaphragm seat, and the inlet one-way valve piece unidirectionally connects the fluid inlet channel and the suction channel along the working direction;

[0026] The driving mechanism is used for driving the movable capsule cavity to compress or expand.

[0027] By adopting the above technical scheme, the fluid enters the diaphragm seat from the fluid inlet channel, the movable capsule cavity connects the suction channel and the suction hole of the diaphragm seat, at the same time, the inlet one-way valve piece is attached to the opening end surface of the suction hole on the side facing the diaphragm seat, and the inlet one-way valve piece unidirectionally connects the fluid inlet channel and the suction channel along the working direction. The driving mechanism drives the movable capsule cavity to expand, and the movable capsule cavity can draw the fluid from the fluid inlet channel to the suction channel of the diaphragm seat; the driving mechanism drives the movable capsule cavity to contract, and since the inlet one-way valve piece unidirectionally connects the fluid inlet channel and the suction channel along the working direction, the movable capsule cavity can press the fluid in the suction channel into the suction hole, and then the fluid is transported to the working capsule cavity through the pump head, so that the function of the pump is realized. When the driving mechanism stops running, the movable capsule cavity cannot continuously supplement the fluid into the pump head, so that the pressure of the fluid delivered from the pump head to the working capsule cavity is less than the pressure of the fluid in the working capsule cavity, the fluid flows from the output flow path to the exhaust check valve piece, the exhaust check valve piece blocks the exhaust flow path, and the fluid in the output flow path changes the valve function piece from the state of abutting against the pressure relief nozzle to the state of separating from the pressure relief nozzle, so that the valve function piece connects the output flow path and the pressure relief flow path, thereby realizing the function of the pump valve.

[0028] Optionally, the driving mechanism comprises a base installed on the side of the diaphragm seat away from the diaphragm seat, the base is installed with a motor, an eccentric wheel is coaxially fixed on the output shaft of the motor, a steel shaft is obliquely installed on the eccentric wheel, and a crankshaft is installed on the end of the steel shaft away from the eccentric wheel, and the crankshaft drives the movable capsule cavity to compress or expand.

[0029] By adopting the above technical scheme, the motor installed on the base drives the eccentric wheel to rotate, the steel shaft obliquely arranged on the eccentric wheel swings when the eccentric wheel rotates, the crankshaft is installed on the end of the steel shaft away from the eccentric wheel, the steel shaft drives the crankshaft to swing back and forth, and the crankshaft drives the movable capsule cavity to compress or expand back and forth, thereby realizing the function of driving the movable capsule cavity to move back and forth.

[0030] Optionally, the crankshaft is provided with a driving mounting hole, and the capsule is provided with a driving mounting column on the side close to the crankshaft, the driving mounting column is in clamping connection with the driving mounting hole.

[0031] By using the above technical scheme, the driving mounting hole on the crankshaft is in clamping connection with the driving mounting column on the capsule, so that the driving mounting column installed on the crankshaft drives the capsule to move periodically, thereby realizing the periodic power output of the crankshaft to the capsule.

[0032] Optionally, the pump-valve integrated structure further comprises a fixed clamping hook, the base is provided with a second fixed clamping groove, the upper cover is provided with a first fixed clamping groove, one end of the fixed clamping hook is in clamping connection with the first fixed clamping groove, and the other end of the fixed clamping hook is in clamping connection with the second fixed clamping groove.

[0033] By using the above technical scheme, one end of the fixed clamping hook is in clamping connection with the first fixed clamping groove, and the other end of the fixed clamping hook is in clamping connection with the second fixed clamping groove, so that the fixed clamping hook detachably fixes the pump head, the pump body and the driving mechanism, thereby enabling the driving mechanism, the pump body and the pump head to be maintained and replaced separately, and improving the maintenance convenience of the pump-valve integrated structure.

[0034] In summary, the present application has at least one of the following beneficial technical effects:

[0035] 1. In order to make the pressure in the working capsule chamber reach the preset target, the pressure of the pump head conveying fluid to the working capsule chamber gradually increases, thereby causing the pressure in the unloading flow path to also gradually increase. The valve function piece selectively connects the output flow path and the pressure relief flow path, the suction check valve piece and the discharge check valve piece are designed on the double-function valve piece, the function of the valve body is integrated on the basis of improving the pump structure, the system configuration is simplified, the pump-valve integrated function is realized only in the three-layer structure of the upper cover, the diaphragm seat and the membrane seat, the flow path structure is optimized, a new flow path is designed, the performance reliability of the pump-valve integrated structure can be changed, the double-function valve piece is closed when pumping fluid into the working capsule chamber, and the double-function valve piece is opened when deflating, the pump-valve double-function reliability is realized, and the required performance of the product is met.

[0036] 2. When the fluid flows in the working direction, the pressure of the pump head conveying fluid to the working capsule chamber is greater than the pressure of the fluid in the working capsule chamber, so that the valve function piece abuts against the pressure relief nozzle, so that the valve function piece blocks the output flow path and the pressure relief flow path; when the pump head stops conveying fluid, the pressure of the pump head conveying fluid to the working capsule chamber is less than the pressure of the fluid in the working capsule chamber, the fluid flows from the output flow path to the discharge check valve piece, the discharge check valve piece blocks the discharge flow path, the fluid in the output flow path separates the valve function piece and the pressure relief nozzle, so that the valve function piece connects the output flow path and the pressure relief flow path, thereby realizing the pump-valve integrated function.

[0037] 3. When the driving mechanism is running, the active capsule cavity is driven to contract, and the active capsule cavity can press the fluid in the suction channel to the suction hole, and the fluid is transported to the working capsule cavity through the pump head, so as to realize the function of the pump. When the driving mechanism stops running, the active capsule cavity cannot continuously supplement the fluid into the pump head, so that the pressure of the fluid delivered by the pump head to the working capsule cavity is less than the pressure of the fluid in the working capsule cavity, and the fluid in the output flow channel separates the valve function piece from the pressure relief nozzle, so that the pump valve integrated structure integrates double functions. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the pump valve integrated structure in the embodiment of the present application;

[0039] Figure 2 FIG. 3 is a schematic diagram of the structure of the pump head in the embodiment of the present application, which shows a bottom view of the pump head from the oblique lower side;

[0040] Figure 3 FIG. 4 is a schematic diagram of the structure of the pump head in the embodiment of the present application, which shows a top view of the pump head from the oblique upper side;

[0041] Figure 4 FIG. 5 is a schematic diagram of the structure of the pump body and the driving mechanism in the embodiment of the present application.

[0042] BRIEF DESCRIPTION OF DRAWINGS

[0043] 100, pump head;

[0044] 110, upper cover; 111, output nozzle; 112, pressure relief nozzle; 113, first fixed clamping groove; 114, communication groove;

[0045] 120, diaphragm seat; 121, pressure relief channel; 122, valve function cavity; 123, suction channel; 124, suction hole; 125, discharge channel;

[0046] 130, double-function valve piece; 131, suction check valve piece; 132, discharge check valve piece; 133, valve function piece; 134, flow guide boss; 1341, flow guide channel;

[0047] 200, pump body;

[0048] 210, diaphragm seat; 211, fluid inlet channel;

[0049] 220, cup capsule; 221, active capsule cavity; 222, inlet check valve piece; 223, driving mounting column;

[0050] 300, driving mechanism;

[0051] 310, base; 311, second fixed clamping groove;

[0052] 320, motor;

[0053] 330, eccentric; 331, eccentric hole;

[0054] 340, steel shaft;

[0055] 350, crankshaft; 351, driving mounting hole;

[0056] 400, fixed clasp. DETAILED DESCRIPTION

[0057] The following description will be made in conjunction with the accompanying drawings Figures 1-4 The application is further described in detail.

[0058] The embodiment of the application discloses a pump valve integrated structure. Referring to Figure 1 The pump valve integrated structure comprises, from top to bottom, a pump head 100, a pump body 200 and a driving mechanism 300, wherein the pump head 100, the pump body 200 and the driving mechanism 300 are fixed by a fixed clasp 400, so that the driving mechanism 300, the pump body 200 and the pump head 100 can be maintained and replaced separately, and the maintenance convenience of the pump valve integrated structure is improved. In the embodiment, two fluid channels are arranged in the pump valve integrated structure, and the two fluid channels are arranged in a central symmetry along the central axis of the pump valve integrated structure in the height direction. For convenience of description, all the fluid channels described below are one of the fluid channels in the pump valve integrated structure.

[0059] Referring to Figure 1 and Figure 2 The pump head 100 comprises an upper cover 110, a double-function valve sheet 130 and a diaphragm seat 120, and the double-function valve sheet 130 is installed between the upper cover 110 and the diaphragm seat 120. The upper cover 110 is generally in the shape of a cuboid, and an output nozzle 111 is arranged on the upper end surface of the upper cover 110. The output nozzle 111 is used for communicating with a working cavity. The output nozzle 111 is provided with a through hole penetrating the output nozzle 111 from top to bottom, and an output flow path is formed in the through hole of the output nozzle 111. A communication groove 114 is arranged on the lower end surface of the upper cover 110, and the communication groove 114 communicates with the output flow path. The groove bottom of the communication groove 114 is provided with a pressure relief nozzle 112, and the height of the pressure relief nozzle 112 is lower than the depth of the communication groove 114. The pressure relief nozzle 112 is provided with a through hole penetrating the pressure relief nozzle 112 from top to bottom, and a pressure relief flow path is formed in the through hole of the pressure relief nozzle 112.

[0060] Referring to Figure 2 and Figure 3The double-function valve piece 130 is generally in the shape of a rectangular plate, and the suction one-way valve piece 131, the discharge check valve piece 132 and the valve function piece 133 are integrally formed on the double-function valve piece 130. The suction one-way valve piece 131 is generally in the shape of a disc, and the connecting edge of the suction one-way valve piece 131 is connected to the double-function valve piece 130, while the other edges of the suction one-way valve piece 131 are separated from the double-function valve piece 130, so that the suction one-way valve piece 131 can rotate along the connecting edge of the suction one-way valve piece 131. Similarly, the discharge check valve piece 132 has the same structure as the suction one-way valve piece 131. The valve function piece 133 is generally in the shape of a thin disc, and the outer circumferential surface of the valve function piece 133 is connected to the double-function valve piece 130, while the center of the valve function piece 133 is raised, and the center of the valve function piece 133 is higher than the edges. In addition, the valve function piece 133 has elasticity, and the center of the valve function piece 133 can move up and down under the action of fluid pressure.

[0061] With reference to Figure 2 and Figure 3 , the double-function valve piece 130 is provided with a flow guide boss 134 on the side facing the pump head 100, and the flow guide boss 134 is provided with a flow guide channel 1341 for guiding the fluid in the output flow path to the pressure relief flow path. During the pressure relief process of the working capsule cavity, the flow guide channel 1341 can guide the fluid in the output flow path to the pressure relief flow path, improve the turbulence of the fluid at the junction of the output flow path and the pressure relief flow path, and thus improve the running stability of the pump head 100.

[0062] With reference to Figure 2 and Figure 3 , the diaphragm seat 120 is generally in the shape of a rectangular plate. The upper end surface of the diaphragm seat 120 is provided with a receiving groove, and the double-function valve piece 130 is installed in the receiving groove. The bottom of the receiving groove is provided with a discharge channel 125 and a pressure relief channel 121, and the bottom of the receiving groove is also provided with a suction hole 124 which penetrates the receiving groove up and down. The lower end surface of the diaphragm seat 120 is provided with a suction channel 123, and the suction hole 124 communicates with the suction channel 123. The discharge channel 125 forms a discharge flow path, the pressure relief channel 121 forms a pressure relief flow path, and the suction channel 123 and the suction hole 124 together form a suction flow path.

[0063] With reference to Figure 2 and Figure 3, the bottom end surface of the double-function valve piece 130 abuts against the groove bottom of the accommodating groove, and the suction one-way valve piece 131 unidirectionally connects the suction flow path and the discharge flow path along the working direction. The direction of the suction flow path towards the unloading flow path is the unloading direction, and the suction one-way valve piece 131 unidirectionally connects the suction flow path and the unloading flow path along the unloading direction. The discharge check valve piece 132 unidirectionally connects the discharge flow path and the output flow path along the working direction. The valve function piece 133 moves up and down, and the valve function piece 133 is elastic. By abutting against or separating from the unloading pressure nozzle 112, the valve function piece 133 selectively connects the output flow path and the unloading pressure flow path.

[0064] With reference to Figure 2 and Figure 3 , there are two flow paths of fluid in the pump head 100. The first path is that the fluid enters the working chamber through the suction flow path, the discharge flow path and the output flow path. The second path is that the fluid enters the unloading flow path from the suction flow path along the unloading direction. When the fluid is continuously delivered into the working chamber, the pressure in the working chamber gradually increases. In order to make the pressure in the working chamber reach the preset target, the pressure of the fluid delivered by the pump head 100 to the working chamber gradually increases, so that the pressure in the unloading flow path also gradually increases. When the pressure of the fluid delivered by the pump head 100 to the working chamber is greater than the pressure of the fluid in the working chamber, the pressure of the fluid in the unloading flow path is greater than the pressure of the fluid in the output flow path. At this time, the valve function piece 133 blocks the output flow path and the unloading pressure flow path, and the unloading pressure flow path is in a closed state. When the pressure of the fluid delivered by the pump head 100 to the working chamber is less than the pressure of the fluid in the working chamber, the pressure of the fluid in the unloading flow path is less than the pressure of the fluid in the output flow path. The valve function piece 133 connects the output flow path and the unloading pressure flow path, so as to complete the unloading action.

[0065] With reference to Figure 2 and Figure 3 , the state that the valve function piece 133 is pressed against the unloading pressure nozzle 112 is more stable. The unloading passage 121 is provided with a valve function cavity 122. The outline of the valve function cavity 122 is the same as the outline of the valve function piece 133, and the valve function cavity 122 is aligned with the valve function piece 133. Therefore, the fluid entering the valve function cavity 122 is uniformly distributed on the side of the valve function piece 133 close to the pump body 200. When the pressure of the fluid delivered by the pump head 100 to the working chamber is greater than the pressure of the fluid in the working chamber, the valve function piece 133 is subjected to more uniform fluid pressure, the deformation of the valve function piece 133 is more uniform, and the sealing effect of the valve function piece 133 is better.

[0066] With reference to Figure 2 and Figure 3, the pump body 200 includes a diaphragm seat 210 and a cup capsule 220, the diaphragm seat 210 is installed on the lower end face of the diaphragm seat 120. The cup capsule 220 is installed between the diaphragm seat 210 and the diaphragm seat 120, the diaphragm seat 210 is formed with a fluid inlet channel 211, the fluid inlet channel 211 is used for the fluid to enter the suction channel 123 of the bottom end face of the diaphragm seat 120. In this embodiment, the fluid inlet channel 211 is an air inlet hole. In another embodiment, the fluid inlet channel 211 can also be provided as a liquid delivery pipe; the cup capsule 220 has a movable capsule cavity 221 and an inlet one-way valve piece 222, the movable capsule cavity 221 is arranged in a bell shape, and the movable capsule cavity 221 is used to communicate the suction channel 123 and the suction hole 124. The inlet one-way valve piece 222 is attached to the opening end face of the suction hole 124 on the side facing the diaphragm seat 120, so that the inlet one-way valve piece 222 unidirectionally communicates the fluid inlet channel 211 and the suction channel 123 along the working direction.

[0067] Referring to Figure 1 , the driving mechanism 300 includes a base 310 installed on the bottom end of the diaphragm seat 210, the bottom end face of the base 310 is fixedly installed with a motor 320 by bolts, the output shaft of the motor 320 is coaxially fixed with an eccentric wheel 330, the upper end face of the eccentric wheel 330 is provided with an eccentric hole 331, the eccentric hole 331 is obliquely installed with a steel shaft 340, the end of the steel shaft 340 away from the eccentric wheel 330 is installed with a crankshaft 350, and the crankshaft 350 drives the movable capsule cavity 221 to compress or expand. In order to improve the wear resistance of the eccentric wheel 330 and the steel shaft 340, a steel column is installed in the eccentric hole 331, and the steel shaft 340 abuts against the steel column. The crankshaft 350 is provided with a driving installation hole 351, and the side of the cup capsule 220 close to the crankshaft 350 is provided with a driving installation column 223, and the driving installation column 223 is clamped and matched with the driving installation hole 351. The motor 320 drives the eccentric wheel 330 to rotate, the steel shaft 340 obliquely arranged on the eccentric wheel 330 swings, and the steel shaft 340 drives the crankshaft 350 to reciprocatingly swing. Since the driving installation hole 351 on the crankshaft 350 is clamped and matched with the driving installation column 223 on the cup capsule 220, the driving installation column 223 installed on the crankshaft 350 drives the cup capsule 220 to move periodically, so as to realize the periodic power output of the crankshaft 350 to the cup capsule 220, and realize the function of driving the movable capsule cavity 221 to reciprocate.

[0068] Referring to Figure 4 Figure 4 Figure 1, in order to improve the maintenance convenience of the pump-valve integrated structure, the base 310 is provided with a second fixed clamping groove 311, the upper cover 110 is provided with a first fixed clamping groove 113, one end of the fixed clamping hook 400 is in clamping cooperation with the first fixed clamping groove 113, and the other end of the fixed clamping hook 400 is in clamping cooperation with the second fixed clamping groove 311. The fixed clamping hook 400 detachably fixes the pump head 100, the pump body 200 and the driving mechanism 300, so that the driving mechanism 300, the pump body 200 and the pump head 100 can be maintained and replaced separately.

[0069] The implementation principle of the pump-valve integrated structure in the embodiment of the application is as follows: the motor 320 drives the eccentric wheel 330 to rotate, the eccentric wheel 330 drives the cup capsule 220 to move through the steel shaft 340 and the crankshaft 350, the pumped fluid reaches the designated closed space on one hand and positively pressurizes the valve function piece 133 to close the pressure relief channel on the other hand, after the motor 320 is powered off, the closed space fluid backflows, reversely pressurizes the valve capsule to open the pressure relief, and the check valve piece 132 ensures that the closed space fluid will not backflow to the valve function piece 133 positively, so that the desired pump-valve dual function is stably and reliably realized.

[0070] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Among them, the same parts are indicated by the same reference numerals. It should be noted that the words "front", "back", "left", "right", "up" and "down" used in the above description refer to the directions in the drawings, and the words "inner" and "outer" respectively refer to the directions towards or away from the geometric center of a specific part. Therefore: any equivalent changes made according to the structure, shape, principle of the application shall be covered within the protection scope of the application.

Claims

1. A pump head, characterized by The utility model relates to a kind of pump head, including: Upper cover (110), the upper cover (110) is formed with for communicating work capsule's output flow path and with the output flow path selectively communicating pressure relief flow path; Diaphragm seat (120), the diaphragm seat (120) is formed with suction flow path, discharge flow path and stop unloading flow path, the suction flow path, the discharge flow path and the output flow path are unidirectionally communicated along working direction; Dual-function valve sheet (130), the dual-function valve sheet (130) is arranged between the upper cover (110) and the diaphragm seat (120), the dual-function valve sheet (130) is provided with suction check valve sheet (131), discharge check valve sheet (132) and valve function sheet (133);The suction check valve sheet (131) is unidirectionally communicated along working direction with the suction flow path and the discharge flow path, the direction of the suction flow path towards the stop unloading flow path is stop unloading direction, the suction check valve sheet (131) is unidirectionally communicated along the stop unloading direction with the suction flow path and the stop unloading flow path;The discharge check valve sheet (132) is unidirectionally communicated along working direction with the discharge flow path and the output flow path;The valve function sheet (133) selectively communicates the output flow path with the pressure relief flow path; Wherein, the upper cover (110) is provided with for inputting fluid to work capsule's output nozzle (111) and for work capsule's discharge fluid pressure relief nozzle (112), the output flow path is formed in the output nozzle (111), the pressure relief flow path is formed in the pressure relief nozzle (112);When fluid flows along working direction, the valve function sheet (133) is tightly closed to the pressure relief nozzle (112) and blocks the output flow path with the pressure relief flow path;When pump head stops conveying fluid, fluid flows from the output flow path to the discharge check valve sheet (132), the discharge check valve sheet (132) blocks the discharge flow path with the output flow path, the valve function sheet (133) is separated from the pressure relief nozzle (112), and the output flow path is communicated with the pressure relief flow path; The stop unloading flow path includes stop unloading passage (121) formed in the diaphragm seat (120), the stop unloading passage (121) is provided with valve function cavity (122) towards the side where the dual-function valve sheet (130) is located, the valve function sheet (133) seals the opening end face of the valve function cavity (122) towards the side where the dual-function valve sheet (130) is located, the valve function sheet (133) has elasticity, and the pressure of fluid in the valve function cavity (122) controls the valve function sheet (133) tightly closed to the pressure relief nozzle (112) or separation; Wherein, the valve function sheet (133) is arranged in the form of thin disc, the outer circumferential surface of the valve function sheet (133) is connected to dual-function valve sheet (130), the valve function sheet (133) is centrally raised, and the central position of the valve function sheet (133) is higher than the side position.

2. A pump head as claimed in claim 1, wherein The contour of the valve function cavity (122) is same with the contour of the valve function sheet (133), and the valve function cavity (122) is aligned with the valve function sheet (133).

3. A pump head as claimed in claim 2, wherein The suction flow path comprises a suction passage (123) formed on the diaphragm seat (120) away from the side where the double-function valve sheet (130) is located and a suction hole (124) penetrating through the diaphragm seat (120), and the suction passage (123) communicates with the suction hole (124); the discharge flow path comprises a discharge passage (125) formed on the diaphragm seat (120) close to the side where the double-function valve sheet (130) is located, and the suction hole (124) respectively unidirectionally communicates with the discharge passage (125) and the pressure relief passage (121).

4. A pump head (100) according to claim 1, characterized in that The double-function valve sheet (130) is provided with a flow guide boss (134) on the side facing the pump head (100), and the flow guide boss (134) is provided with a flow guide channel (1341) for guiding the fluid in the output flow path to the pressure relief flow path.

5. A pump-valve integrated structure comprising the pump head according to claim 3, characterized in that, The pump valve integrated structure further comprises: A pump body (200) comprising a diaphragm seat (210) and a cup capsule (220), the diaphragm seat (210) is installed on the side of the diaphragm seat (120) away from the upper cover (110), the cup capsule (220) is installed between the diaphragm seat (210) and the diaphragm seat (120), and the diaphragm seat (210) is formed with a fluid inlet channel (211) for fluid entering the suction passage (123); the cup capsule (220) has a movable capsule cavity (221) and an inlet one-way valve sheet (222), the movable capsule cavity (221) is used for communicating the suction passage (123) and the suction hole (124), and the inlet one-way valve sheet (222) is attached to the opening end face of the suction hole (124) on the side facing the diaphragm seat (120), and the inlet one-way valve sheet (222) unidirectionally communicates the fluid inlet channel (211) and the suction passage (123) along the working direction; A driving mechanism (300) for driving the movable capsule cavity (221) to compress or expand.

6. The pump-valve integrated structure according to claim 5, wherein The driving mechanism (300) comprises a base (310) installed on the side of the diaphragm seat (210) away from the diaphragm seat (120), the base (310) is installed with a motor (320), an eccentric wheel (330) is coaxially fixed on the output shaft of the motor (320), a steel shaft (340) is obliquely installed on the eccentric wheel (330), a crankshaft (350) is installed on the end of the steel shaft (340) away from the eccentric wheel (330), and the crankshaft (350) drives the movable capsule cavity (221) to compress or expand.

7. The pump-valve integrated structure according to claim 6, wherein The crankshaft (350) is provided with a driving mounting hole (351), and the cup capsule (220) is provided with a driving mounting column (223) on the side close to the crankshaft (350), and the driving mounting column (223) is in clamping fit with the driving mounting hole (351).

8. The pump-valve integrated structure according to claim 7, wherein The pump-valve integrated structure further comprises a fixed clamping hook (400), the base (310) is provided with a second fixed clamping groove (311), the upper cover (110) is provided with a first fixed clamping groove (113), one end of the fixed clamping hook (400) is matched with the first fixed clamping groove (113) in clamping, and the other end of the fixed clamping hook (400) is matched with the second fixed clamping groove (311) in clamping.

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