Electromagnetic reciprocating pump and alcohol tester

Abstract

An electromagnetic reciprocating pump (1) and an alcohol tester. The electromagnetic reciprocating pump (1) comprises a driving device (10) and a pump body (20). The pump body (20) comprises a flexible housing (22), an accommodating cavity (C3), and a channel (213) in communication with the accommodating cavity (C3). The driving device (10) comprises a cylinder (111), a coil (112), a magnet (121), a first ferromagnetic element (113) and a second ferromagnetic element (114); the coil (112) generates magnetic fields in different directions by changing the current direction so as to drive the magnet (121) in the cylinder (111) to move back and forth in a motion direction; the first ferromagnetic element (113) and the second ferromagnetic element (114) are spaced apart at the front end and rear end in the motion direction of the magnet; the first ferromagnetic element (113) and the second ferromagnetic element (114) can attract the magnet (121), and when the magnet (121) moves to one end and is attracted by one of the first ferromagnetic element (113) and the second ferromagnetic element (114), the magnet (121) is kept at the position; the magnet (121) is used for driving the flexible housing (22) to deform so as to change the volume of the accommodating cavity (C3) to achieve fluid intake and discharge. According to the electromagnetic reciprocating pump (1) and the alcohol tester, different states of the pump body can be maintained, and the structure is simple.

Description

Electromagnetic reciprocating pump and alcohol detector

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 29, 2024, with application number 202410383115.7 and invention name “Electromagnetic Reciprocating Pump and Alcohol Detector”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of gas detection equipment, and in particular to an electromagnetic reciprocating pump and an alcohol detector. Background Art

[0003] Gas detection equipment such as an alcohol detector is a device used to investigate and punish drunk driving. It is mainly composed of an alcohol sensor and an air pump. When conducting an alcohol test, the mouthpiece introduces the gas exhaled by the subject into the instrument, and the air pump draws the required amount of gas from the mouthpiece into the alcohol sensor, which then performs analysis and detection.

[0004] The air pumps used in alcohol detectors include continuous air pumps and reciprocating air pumps. The continuous air pump continuously delivers the gas to be tested to the alcohol sensor, and the alcohol sensor detects the continuous airflow, such as the technical solution disclosed in the Chinese patent application number 201020194689.3 (prior technology 1). The reciprocating air pump extracts a certain volume of gas into the alcohol sensor, and the alcohol sensor detects a certain volume of gas. After the detection is completed, the reciprocating air pump discharges the reacted gas in the alcohol sensor, such as the technical solution disclosed in the Chinese patent application number 201520790016.7 (prior technology 2). Since the volume accuracy of the gas extracted by the reciprocating air pump is higher, the detection accuracy of the alcohol detector using a reciprocating air pump is higher than that of the alcohol detector using a continuous air pump.

[0005] The reciprocating air pump includes a pump body and a drive unit. A variable-volume accommodating chamber is formed in the pump body. The drive unit drives the pump body to perform reciprocating motion, thereby changing the volume of the accommodating chamber to achieve gas transportation.

[0006] According to the different pump body structures, reciprocating air pumps can be divided into piston type and diaphragm type.

[0007] A piston-type air pump, such as the prior art 2, includes a piston barrel (also known as an air cylinder) and a piston disposed in the piston barrel. A accommodating chamber is formed between the piston and the piston barrel. A coil is provided on the piston barrel, and the piston is a magnet. When the coil is energized, the piston can move in one direction. When the direction of the current is changed, the piston can move in the opposite direction, thereby changing the position of the piston. Changing the position of the piston can change the volume of the accommodating chamber. The piston and the piston barrel are both rigid structures and are not easily deformed. Therefore, the piston-type air pump has the advantage of high volumetric accuracy of extracted gas. However, the matching accuracy between the piston and the piston barrel is high, and a seal is required between the piston and the piston barrel to avoid air leakage. If the matching accuracy between the piston and the piston barrel is not sufficient, air leakage will occur, which makes the manufacturing of the piston-type air pump more difficult and more expensive. In addition, in order to ensure the sealing performance, a lubricating material needs to be provided on the surface of the piston, which results in a high manufacturing cost and a more complicated manufacturing process.

[0008] Diaphragm air pumps, such as Chinese Patent Application No. 200620122910.8 (Prior Art 3) and Chinese Patent Application No. 202020958164.6 (Prior Art 4), both include a flexible airbag, an electromagnet, a spring, a transmission rod, and a bracket. A variable-volume chamber is formed inside the airbag. By stretching or squeezing the airbag, the volume of the chamber can be changed to achieve the suction or discharge of external gas. The electromagnet is fixed to the bracket. When energized, it drives the transmission rod to move in one direction. After being energized for about 1 second, it is turned off and moves in the opposite direction due to the restoring force of the spring to prepare for the next action. This type of air pump needs to be continuously energized to maintain the suction or discharge state. When the power is maintained, the coil will heat up, so the gas suction state can only be maintained for a limited time. It is impossible to wait for the sensor to fully react before the power is turned off and the spring is restored to return to the gas discharge state. Therefore, the measurement accuracy is low. Diaphragm air pumps have lower manufacturing precision requirements and will not leak due to insufficient fitting accuracy. However, since the airbag is a flexible structure, unpredictable deformation will occur during use, resulting in insufficient volume accuracy and poor repeatability of the extracted gas.

[0009] According to the structure of the drive unit, the air pump can be divided into single-holding type and double-holding type.

[0010] The air pumps disclosed in prior art 3 and prior art 4 are both single-holding air pumps. The drive unit of the air pump includes a coil, an electromagnet, a connecting rod, and a spring. The coil is mounted on the electromagnet, and the two ends of the connecting rod are connected to the electromagnet and the pump body, respectively. The two ends of the spring are connected to the connecting rod and the coil, respectively. The spring exerts an extending force on the connecting rod. Therefore, when the power is off, the elastic force of the spring keeps the connecting rod in the extended state, generally in the gas discharge state. When the coil is energized, under the action of the magnetic field, the magnet is subjected to a magnetic force in the contraction direction, driving the connecting rod to move in the contraction direction and then remain in the contracted state, generally in the gas suction state. However, after the coil is de-energized, the magnetic force is lost, and under the action of the spring, the connecting rod returns to the extended state. When the connecting rod is in the contracted state, the coil needs to be continuously energized to maintain this holding state, which consumes a lot of energy and causes the coil to heat up. Therefore, this type of air pump generally only works in a single holding state, that is, it is powered only when the pump is pumped backward, and is generally not powered when returning forward but is restored and maintained in this state by spring force. In this way, the return is completed instantly after the pump is pumped, and the extracted gas does not have time to complete the reaction in the sensor and is discharged from the sensor by the return action of the air pump spring. The repeatability of this type of air pump is poor.

[0011] In an existing technology, the driving unit of a dual-holding air pump (its working principle can be referred to CN101771329A) includes a double coil + middle magnet structure. By changing the direction of the current, one of the front and rear coils can be operated, thereby generating a two-way airflow action of suction and exhaust and maintaining a certain state when not working without rapid recovery due to springs, etc. The advantage is two-way maintenance, the suction and exhaust states can be maintained at all times, and there is no spring recovery action. The disadvantage is that the structure is complex and the volume is large. Technical issues:

[0012] The embodiment of the present application provides an electromagnetic reciprocating pump and an alcohol detector. The electromagnetic reciprocating pump can achieve two-way maintenance of suction and exhaust without the need to design a multi-coil structure on the basis of eliminating the spring, making the electromagnetic reciprocating pump simple in structure. Technical solutions:

[0013] In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

[0014] In a first aspect, an embodiment of the present application provides an electromagnetic reciprocating pump, comprising a drive device and a pump body, wherein the pump body comprises a flexible shell, a receiving cavity, and a channel communicating with the receiving cavity, wherein the channel is used to connect the receiving cavity with the outside world;

[0015] The driving device includes: a cylinder, a coil and a magnet. The coil generates magnetic fields in different directions by changing the direction of the current to drive the magnet in the cylinder to move forward and backward along the direction of movement.

[0016] The driving device further includes: a first ferromagnetic element and a second ferromagnetic element, wherein the first ferromagnetic element and the second ferromagnetic element are spaced apart at front and rear ends along the direction of movement of the magnet, the first ferromagnetic element and the second ferromagnetic element are both capable of attracting the magnet, and after the magnet moves to one end, it is attracted to one of the first ferromagnetic element and the second ferromagnetic element and is held in that position;

[0017] The magnet is connected to the flexible shell, and is used to drive the flexible shell to deform and change the volume of the accommodating cavity to achieve fluid suction and discharge.

[0018] In a second aspect, an embodiment of the present application provides an alcohol detector, which includes the electromagnetic reciprocating pump as described above. Beneficial effects:

[0019] The driving device of the embodiment of the present application not only drives the pump body to produce deformation, but the driving device can also maintain the attraction relationship between the first ferromagnetic element and the second ferromagnetic element and the magnet in different states to achieve the maintenance of the pump body in different states. Therefore, the driving device of the embodiment of the present application can drive the pump body to achieve two-way maintenance of suction and exhaust, so that the driving device drives the pump body to enable the pump body to perform quantitative gas delivery. The electromagnetic reciprocating pump of the embodiment of the present application can achieve two-way maintenance of suction and exhaust without designing a multi-coil structure on the basis of eliminating the spring, making the electromagnetic reciprocating pump simple in structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] FIG1 is a front view of the electromagnetic reciprocating pump provided in an embodiment of the present application.

[0021] FIG2 is a three-dimensional diagram of the electromagnetic reciprocating pump provided in an embodiment of the present application.

[0022] FIG3 is a three-dimensional diagram of the electromagnetic reciprocating pump provided in an embodiment of the present application.

[0023] FIG4 is a perspective view of an electromagnetic reciprocating pump provided in an embodiment of the present application.

[0024] FIG5 is a cross-sectional view of the electromagnetic reciprocating pump shown in FIG4 along the AA direction in one state.

[0025] FIG6 is a cross-sectional view of the electromagnetic reciprocating pump shown in FIG4 along the AA direction in another state.

[0026] FIG7 is a schematic block diagram of an alcohol detector provided in an embodiment of the present application.

[0027] FIG8 is a schematic diagram of the connection of an electromagnetic reciprocating pump provided in an embodiment of the present application. Modes for Carrying Out the Invention

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. All other embodiments obtained by those skilled in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0029] References herein to "embodiments" or "implementations" mean that a particular feature, structure, or characteristic described in connection with the embodiments or implementations may be included in at least one embodiment of the present application. The appearance of such phrases in various places in the specification does not necessarily refer to the same embodiment, nor do they constitute independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0030] To solve the above technical problems, referring to Figures 1 to 4, an embodiment of the present application provides an electromagnetic reciprocating pump 1, which includes a drive device 10 and a pump body 20. The drive device 10 and the pump body 20 are connected, and the drive device 10 can drive the pump body 20 to deform to extract and discharge fluid, or in other words, the drive device 10 can drive the pump body 20 to deform to suck in and discharge fluid. The electromagnetic reciprocating pump 1 in the embodiment of the present application takes the transportation of gas as an example, but is not only applicable to gas, but also to liquid.

[0031] As shown in Figures 5 and 6 , the pump body 20 has a variable-volume accommodating chamber C3 that can accommodate gas. The pump body 20 also has a channel 213 that communicates with the accommodating chamber C3 and is also connected to the outside world. Channel 213 is used to connect the accommodating chamber C3 with the outside world.

[0032] For example, channel 213 can be connected to a gas detector, such as an alcohol sensor and mouthpiece of a breathalyzer, and chamber C3 can be connected to the alcohol sensor via channel 213. Thus, when driven by the driving device 10, pump body 20 can draw gas from the mouthpiece through chamber C3 and channel 213 into the alcohol sensor for reaction. After the reaction is complete, pump body 20, still driven by the driving device 10, can discharge the gas in chamber C3 through channel 213 out of pump body 20, thereby completing the sampling and reaction of exhaled gas.

[0033] Continuing to refer to Figures 5 and 6, the drive device 10 may include a first ferromagnetic element 113, a second ferromagnetic element 114, and a movable magnet 121. The magnet 121 can move in a predetermined direction. For example, the magnet 121 can move in a predetermined direction D1. If the channel 213 is considered to be the front end of the electromagnetic reciprocating pump and the direction of the second air outlet T2 is the rear end, the predetermined direction D1 can be understood as the direction of movement of the magnet 121 along the front-to-back direction of the electromagnetic reciprocating pump. The magnet 121 is connected to the pump body 20, and when the magnet 121 moves in the predetermined direction D1, it can drive the pump body 20 to deform.

[0034] Illustratively, the first ferromagnetic element 113 and the second ferromagnetic element 114 are spaced apart at the front and rear ends along the movement direction D1 of the magnet 121, and both the first ferromagnetic element 113 and the second ferromagnetic element 114 are capable of attracting the magnet 121. Illustratively, when the magnet 121 moves to one end in the front-to-back direction of the electromagnetic reciprocating pump 1 and is in a non-moving state, it is attracted to one of the first ferromagnetic element 113 and the second ferromagnetic element 114 and remains in that position.

[0035] As shown in Figure 5, the magnet 121 and the first ferromagnetic element 113 attract each other. When there is no external force acting on the magnet 121, the attraction force between the first ferromagnetic element 113 and the magnet 121 can keep the magnet 121 in the front end state of the electromagnetic reciprocating pump. In this embodiment of the application, the drive device 10 is referred to as being in the first state.

[0036] As shown in Figure 6, the magnet 121 and the second ferromagnetic element 114 attract each other. In the absence of external force, the attraction force between the second ferromagnetic element 114 and the magnet 121 can keep the magnet 121 in the rear end state of the electromagnetic reciprocating pump. In this embodiment of the application, the drive device 10 is said to be in the second state.

[0037] Please continue to refer to Figures 5 and 6. The shapes of the pump body 20 shown in Figure 5 and the pump body 20 shown in Figure 6 are different. As shown in Figure 5, the pump body 20 is in a compressed state. The embodiment of the present application refers to the pump body 20 as being in the first state. At this time, the volume of the accommodating chamber C3 of the pump body 20 is the smallest, almost zero, which can be understood as the pump body 20 has completed exhaust.

[0038] As shown in FIG6 , the pump body 20 is in the expanded state. In this embodiment of the application, the pump body 20 is referred to as being in the second state. At this time, the volume of the accommodating cavity C3 of the pump body 20 is the largest, which can be understood as the pump body 20 has completed air intake.

[0039] The magnet 121 and the first ferromagnetic element 113 attract each other, the pump body 20 is in a compressed state, and the drive device 10 and the pump body 20 are both in a first state. In this embodiment of the application, the electromagnetic reciprocating pump 1 is referred to as being in the first state. The magnet 121 and the second ferromagnetic element 114 attract each other, the pump body 20 is in an expanded state, and the drive device 10 and the pump body 20 are both in a second state. In this embodiment of the application, the electromagnetic reciprocating pump 1 is referred to as being in the second state.

[0040] The accommodating chamber C3 can be maintained in either a maximum or minimum volume state. Therefore, the volume of gas drawn into the accommodating chamber C3 when it transitions from its minimum volume state to its maximum volume state is fixed, and the volume of gas discharged from the accommodating chamber C3 when it transitions from its maximum volume state to its minimum volume state is also fixed. Thus, the drive device 10 drives the pump body 20 to transition the accommodating chamber C3 between its maximum and minimum volume states, enabling accurate sampling of gas volumes.

[0041] The driving device 10 of the embodiment of the present application not only drives the pump body 20 to produce deformation, but the driving device 10 can also maintain the required time in different states to achieve long-term maintenance of the different states of the pump body 20. Therefore, the driving device 10 of the embodiment of the present application can drive the pump body 20 to achieve two-way maintenance of suction and exhaust, and the embodiment of the present application is referred to as double maintenance, so that the driving device 10 drives the pump body 20 so that the pump body 20 performs quantitative sampling of gas. The electromagnetic reciprocating pump 1 of the embodiment of the present application is a quantitative pump. Since the double maintenance is maintained by the mutual attraction of magnetic parts, rather than by energizing the coil, there is no power loss during the maintenance process and no heat is generated.

[0042] Compared with the piston air pump in the prior art 2, the embodiment of the present application does not need to design a sealing structure in the driving device 10, thereby avoiding the disadvantage of the piston air pump being prone to air leakage. At the same time, it can reduce the precision requirements for the mutual cooperation between the driving device 10 and the pump body 20, reducing the manufacturing difficulty and cost.

[0043] Compared with the prior art 3 and the prior art 4 which use a spring to achieve unidirectional retention of the pump body, the embodiment of the present application can not only eliminate the spring, thus avoiding the problem of poor consistency in mass production of such air pumps caused by the difficulty in controlling the elastic restoring force due to poor spring consistency, but also compared with the disadvantage of the spring's shortcoming of a short unidirectional retention time, the embodiment of the present application can achieve bidirectional retention of the pump body 20, and the retention time can be arbitrarily controlled.

[0044] Compared with the prior art 5 which uses a complex structure to achieve bidirectional retention of the pump body, the first ferromagnetic element 113 and the second ferromagnetic element 114 of the driving device 10 of the embodiment of the present application can achieve bidirectional retention of the pump body 20. The driving device 10 of the embodiment of the present application has a simple structure and a small size, which can reduce costs.

[0045] Exemplarily, the first ferromagnetic element 113 is a magnet, such as a neodymium iron boron magnet. Alternatively, the first ferromagnetic element 113 is a magnetically attracted ferromagnetic material, such as iron, nickel, or cobalt. It will be appreciated that when the first ferromagnetic element 113 is a magnet, the magnetic poles of the opposing surfaces of the first ferromagnetic element 113 and the magnet 121 are opposite, thereby achieving mutual attraction.

[0046] Exemplarily, the second ferromagnetic element 114 is a magnet, such as a neodymium iron boron magnet. Alternatively, the second ferromagnetic element 114 is a magnetically attracted ferromagnetic material, such as iron, nickel, or cobalt. It will be appreciated that when the second ferromagnetic element 114 is a magnet, the magnetic poles of the opposing surfaces of the second ferromagnetic element 114 and the magnet 121 are opposite, thereby achieving mutual attraction.

[0047] Exemplarily, the driving device 10 further includes a cylinder 111 and a coil 112. The cylinder 111 serves as a carrier of the driving device 10, and is used to carry the coil 112, the first ferromagnetic element 113, the second ferromagnetic element 114, and the magnet 121. The magnet 121 can move within the cylinder 111 under the drive of the coil 112. When the direction of the current in the coil 112 is changed, the direction of movement of the magnet 121 can be changed. Therefore, bidirectional movement can be achieved by simply setting a single coil. Furthermore, when the magnet 121 moves to one end of the air pump, the first ferromagnetic element 113 or the second ferromagnetic element 114 attracts each other, and the electromagnetic reciprocating pump 1 is in the first state or the second state. Thus, compared to the prior art 5 in which multiple coils, such as a double coil, are used to achieve bidirectional retention of the pump body, the driving device 10 of the present embodiment uses a single coil 112 to achieve bidirectional retention. Therefore, compared to the related art, the present embodiment has a simpler structure and can reduce costs.

[0048] In addition, an air pump that uses a spring to achieve unidirectional retention of the pump body, such as a single-retention type air pump, needs to continuously supply current to the coil to maintain its pumping state if dual retention is to be achieved, resulting in high power consumption and heat generation of the single-retention type air pump. In the embodiment of the present application, current only needs to be supplied to the coil 112 when the state of the drive device 10 is switched, or when the state of the pump body 20 is switched. After the pump body 20 completes intake or exhaust, there is no need to supply current to the coil 112. This can greatly reduce the time for supplying current to the coil 112, thereby reducing the power consumption and heat generation of the coil 112.

[0049] The coil 112 is provided on the outer wall of the cylinder 111, and the first ferromagnetic element 113 and the second ferromagnetic element 114 are respectively provided at the front and rear ends of the cylinder 111. One end of the cylinder 111 is close to the pump body 20, and the other end of the cylinder 111 is away from the pump body 20. For example, the cylinder 111 has a front and a rear end, and the end of the cylinder 111 close to the pump body 20 is defined as the front end, and the end of the cylinder 111 away from the pump body 20 is defined as the rear end. Exemplarily, the first ferromagnetic element 113 and the second ferromagnetic element 114 are provided at the front and rear ends of the cylinder 111, such as the first ferromagnetic element 113 is provided at the front end of the cylinder 111, and the second ferromagnetic element 114 is provided at the rear end of the cylinder 111. That is, the first ferromagnetic element 113 is closer to the pump body 20 than the second ferromagnetic element 114, and the second ferromagnetic element 114 is away from the pump body 20 than the first ferromagnetic element 113.

[0050] Exemplarily, the cylinder 111 includes a first ferromagnetic element mounting groove 1116 located at the front end of the cylinder 111 and a second ferromagnetic element mounting groove 1117 located at the rear end of the cylinder 111, the first ferromagnetic element 113 is installed in the first ferromagnetic element mounting groove 1116, and the second ferromagnetic element 114 is installed in the second ferromagnetic element mounting groove 1117. Exemplarily, the first ferromagnetic element mounting groove 1116 and the second ferromagnetic element mounting groove 1117 are both annular grooves. It should be understood that the first ferromagnetic element mounting groove 1116 and the second ferromagnetic element mounting groove 1117 can be groove structures of other shapes, and the embodiments of the present application are not limited thereto. It should be noted that the installation method of the first ferromagnetic element 113 is not limited thereto, such as the first ferromagnetic element 113 is installed on the pump body 20, and it can also be understood that one of the first ferromagnetic element 113 and the second ferromagnetic element 114 is arranged at one end of the cylinder 111 away from the pump body 20, and the other is arranged on the pump body 20. The following is an exemplary description in conjunction with other drawings. It should be understood that no matter which method is used to install the first ferromagnetic element 113 and the second ferromagnetic element 114 in the embodiment of the present application, and no matter where they are installed, when the magnet 121 in the embodiment of the present application moves to one end of the front-to-back direction of the electromagnetic reciprocating pump 1 and is in a non-moving state, it is attracted to one of the first ferromagnetic element 113 and the second ferromagnetic element 114 and remains in that position.

[0051] Exemplarily, the cylinder 111 includes a cylinder body 1111, a front flange 1112, and a rear flange 1113. The front flange 1112 and the rear flange 1113 are disposed on the outside of the cylinder body 1111, and the front flange 1112 and the rear flange 1113 are respectively located at the front end and the rear end of the cylinder body 1111. That is, the front flange 1112 is closer to the pump body 20 than the rear flange 1113, and the rear flange 1113 is farther away from the pump body 20 than the front flange 1112.

[0052] The front flange 1112 and the rear flange 1113 form an installation space 1115 on the outside of the cylindrical body 1111. Alternatively, the cylindrical body 1111, the front flange 1112, and the rear flange 1113 collectively define the installation space 1115. At least a portion of the coil 112 is mounted within the installation space 1115, with both ends of the coil 112 restrained by the front flange 1112 and the rear flange 1113, effectively securing the coil 112 and preventing it from falling off. Exemplarily, the coil 112 does not protrude beyond the front flange 1112 and / or the rear flange 1113 within the installation space 1115. Preferably, the coil 112 is sleeved within the installation space 1115 and is coaxial with the cylindrical body 1111. This creates a more uniform magnetic field within the cylindrical body 1111, thereby stabilizing the movement of the magnet 121.

[0053] Exemplarily, the first ferromagnetic element 113 is closer to the pump body 20 than the coil 112 . The first ferromagnetic element mounting groove 1116 is located on the front flange 1112 .

[0054] Exemplarily, the coil 112 is located outside the second ferromagnetic element 114. In other optional embodiments, the second ferromagnetic element 114 is farther away from the pump body 20 than the coil 112.

[0055] Exemplarily, a partition 115 is provided at the rear end of the cylinder 111, and the partition 115 is disposed in the cylinder 111, and the partition 115 serves as a portion that limits the movement of the magnet 121. Exemplarily, the partition 115 and the magnet 121 are both disposed in the cavity of the cylinder 111, and the partition 115 is fixed to the inner surface of the cylinder 111. Exemplarily, the partition 115 and the cylinder 111 are integrally provided, and the partition 115 can be understood as a part of the cylinder 111. In other optional embodiments, the partition 115 and the cylinder 111 are fixed in other ways, and this application does not limit the connection method of the partition 115 and the cylinder 111.

[0056] The partition 115 within the barrel 111 serves to limit the movement of the magnet 121. For example, when the magnet 121 moves to the position of the partition 115, such as when the end of the magnet 121 away from the pump body 20 abuts the partition 115, the drive device 10 drives the pump body 20 to complete the suction operation. At this time, the magnet 121 can be attracted to the second ferromagnetic element 114, and the accommodating chamber C3 of the pump body 20 is in a state of maximum volume. Alternatively, it can be understood that both the drive device 10 and the pump body 20 are in the second state.

[0057] For example, the second ferromagnetic element 114 can be disposed on the outside of the partition 115, such as on the side of the partition 115 away from the pump body 20. For example, the second ferromagnetic element mounting groove 1117 is formed by the cylinder body 1111 and the partition 115. In other optional embodiments, the second ferromagnetic element mounting groove 1117 is located on the rear flange 1113. In other optional embodiments, the second ferromagnetic element mounting groove 1117 is located on the partition 115.

[0058] In order to prevent foreign matter from entering the cylinder 111 and affecting the operation of the magnet 121, in this embodiment, the front end of the cylinder 111 is tightly connected to the pump body 20, and the cylinder 111, the pump body 20 and the magnet 121 form a front cavity C1 to prevent external foreign matter from entering.

[0059] Illustratively, the cylinder 111 further includes a second connecting portion 1114 disposed on the front side of the front flange 1112 , and the second connecting portion 1114 is connected to a portion of the pump body 20 .

[0060] If the front chamber C1 is a completely sealed structure, when the magnet 121 moves, the gas in the front chamber C1 will be stretched or compressed, and the gas in the front chamber C1 will apply a large resistance to the movement of the magnet 121, which will require a larger current to be input into the coil 112 to obtain sufficient driving force, resulting in increased power consumption and heat generation. Therefore, in this embodiment, the electromagnetic reciprocating pump 1 also includes a first air hole T1 for connecting the front chamber C1 to the outside. When the gas in the front chamber C1 is compressed, it is exhausted through the first air hole T1, and when it is stretched, it is inhaled through the first air hole T1, thereby reducing the resistance applied to the movement of the magnet 121. Exemplarily, the first air hole T1 is provided on the cylinder 111. Specifically, the first air hole T1 is provided on the first connecting portion 1114; in other embodiments, the first air hole T1 can also be provided on the front flange 1113.

[0061] The cylinder 111, the partition 115 and the magnet 121 together form a rear cavity C2. The partition 115 is provided with a second air hole T2 for connecting the rear cavity C2 with the outside.

[0062] At the rear end of the cylinder 111, there is a problem that foreign matter may enter the cylinder 111 and affect the operation of the magnet 121. Therefore, in this embodiment, a partition 115 is provided inside the rear side of the cylinder 111, thereby forming a rear cavity C2 between the cylinder 111, the partition 115 and the magnet 121 to prevent foreign matter from entering.

[0063] If the rear chamber C2 is a sealed structure, when the magnet 121 moves, the magnet 121 will stretch or compress the gas in the rear chamber C2. The gas in the rear chamber C2 will exert a greater resistance to the movement of the magnet 121. This will require a larger current to be input into the coil 112 to obtain sufficient driving force, resulting in increased power consumption and heat generation. Therefore, in this embodiment, the driving device 10 also includes a second air hole T2 provided on the partition 115, and the rear chamber C2 is connected to the outside through the second air hole T2.

[0064] In this embodiment, a gap exists between the magnet 121 and the cylinder 111, which is equivalent to connecting the front chamber C1 and the rear chamber C2 when the magnet 121 moves. This reduces the rate of change of the pressure of the gas in the front chamber C1 or the rear chamber C2 during the movement of the magnet 121, thereby reducing the resistance encountered by the magnet 121 during movement. In other embodiments, a channel connecting the front chamber C1 and the rear chamber C2 can also be provided in other components and / or locations of the drive device 10 to reduce the resistance encountered by the magnet 121 at the start of movement and during movement.

[0065] Exemplarily, the front end of the cylinder 111 is tightly connected to the pump body 20, and the cylinder 111, the pump body 20 and the magnet 121 enclose a front chamber C1, and a gap is formed between the magnet 121 and the cylinder 111, thereby forming a channel connecting the front chamber C1 and the rear chamber C2, so that gas can flow between the front chamber C1 and the rear chamber C2, so as to reduce the gas resistance encountered by the magnet 121 during movement.

[0066] For example, in order to increase the stability and accuracy of the driving device 10 driving the pump body 20 to perform quantitative gas sampling, the material constituting the pump body 20 in the embodiment of the present application includes at least a flexible material portion and a hard material portion, wherein the flexible material portion is conducive to the deformation of the pump body, and the hard material portion can serve as a carrier of the pump body 20 and an object against which the flexible material portion is abutted when it is deformed. It should be noted that if the pump body 20 is made entirely of flexible materials, such as a flexible airbag, in actual application, the flexible airbag will undergo unpredictable deformation and movement, resulting in insufficient volume accuracy and poor repeatability of the gas extracted and discharged by the airbag. Therefore, the material of the pump body 20 in the embodiment of the present application includes at least a flexible material portion and a hard material portion, and the flexible material portion can be deformed relative to the hard material portion, so that the pump body 20 can achieve a predetermined deformation, which can improve the volume accuracy and repeatability of the gas extracted and discharged by the pump body.

[0067] Exemplarily, the pump body 20 includes at least one flexible shell 22 and at least one rigid shell 21. The flexible shell 22 and the rigid shell 21 are hermetically connected to define an accommodating chamber C3. A magnet 121 is connected to the flexible shell 22 and is used to drive the flexible shell 22 to deform relative to the rigid shell 21, thereby changing the volume of the accommodating chamber C3. In the present embodiment, the flexible shell 22 and the rigid shell 21 are each described as an example. It should be understood that the present embodiment does not limit the number of flexible shells 22 and rigid shells 21.

[0068] For example, the hard shell 21 can be made of a rigid material such as hard plastic or metal.

[0069] For example, the flexible shell 22 can be made of flexible materials such as silicone, rubber, and polyurethane (PU).

[0070] The pump body 20 of the embodiment of the present application is a non-full airbag structure such as a semi-airbag structure formed by combining a rigid material and a flexible material. Compared with the piston-type air pump of the prior art, the embodiment of the present application does not require high matching accuracy. Compared with the full airbag type, the non-full airbag structure (semi-airbag structure) has limited mobility, increased controllability, and improved accuracy and repeatability. During operation, the coil 112 is energized with current, and the magnet 121 moves along the cylinder 111 under the action of the magnetic field generated by the coil 112, thereby driving the pump body 20 to work. The direction of movement of the magnet 121 is related to the direction of the current passed into the coil 112. Therefore, the direction of movement of the magnet 121 can be changed by changing the current passed into the coil 112.

[0071] Exemplarily, the edge of the flexible shell 22 is connected to the edge of the hard shell 21. Specifically, the flexible shell 22 includes a flexible shell body 222 and a flexible edge 221. The flexible edge 221 is connected to the edge of the flexible shell body 222, or in other words, the flexible edge 221 is arranged along the edge of the flexible shell body 222. To improve the strength and sealing of the flexible shell 22, the flexible edge 221 and the flexible shell body 222 can be integrally formed. The hard shell 21 includes a hard shell body 211 and a first connecting portion 212. The first connecting portion 212 is connected to the edge of the hard shell body 211, or in other words, the first connecting portion 212 is arranged along the edge of the hard shell body 211. To improve the strength and sealing of the hard shell 21, the hard shell body 211 and the first connecting portion 212 can be integrally formed. The flexible edge 221 and the first connecting portion 212 are connected. Exemplarily, the flexible edge 221 and the first connecting portion 212 are sealed to achieve sealing of the pump body 20 and prevent air leakage in the accommodating chamber C3.

[0072] Exemplarily, the magnet 121 is connected to the flexible shell 222. The magnet 121 and the flexible shell 222 can be directly physically connected or connected using an additional component. Exemplarily, the drive device 10 further includes a connecting rod 122, one end of which is connected to the magnet 121, and the other end of the connecting rod 122 is connected to the flexible shell 222.

[0073] To ensure more uniform force on the flexible shell body 222, in this embodiment, the other end of the connecting rod 122 is connected to the middle of a surface of the flexible shell body 222 that is away from the rigid shell body 211. For example, the flexible shell body 222 is a deformable cup structure, and the other end of the connecting rod 122 is connected to the center of the flexible shell body 222. Driven by the magnet 121, the connecting rod 122 applies thrust and pull to the middle of the flexible shell body 222, resulting in more uniform force on the flexible shell body 222 and, as a result, even more uniform deformation of the flexible shell body 222, thereby improving the volumetric accuracy and repeatability of gas delivery.

[0074] In order to increase the stability of the connection between the connecting rod 122 and the flexible shell body 222, the flexible shell 22 further includes a drive connection portion 223. The drive connection portion 223 is disposed in the middle of a surface of the flexible shell body 222 away from the rigid shell body 211. Exemplarily, the drive connection portion 223 is disposed at the center of the flexible shell body 222. Exemplarily, the drive connection portion 223 and the flexible shell body 222 are integrally provided.

[0075] The other end of the connecting rod 122 is connected to the driving connection part 223. Exemplarily, the driving connection part 223 has an inlet 225 at one end away from the flexible shell body 222, and a connecting groove 224 is formed in communication with the inlet 225. The connecting groove 224 is larger than the inlet 225.

[0076] The connecting rod 122 includes a first rod portion 1221, a second rod portion 1222, and a third rod portion 1223 connected in sequence, such as being integrally formed with the first rod portion 1221, the second rod portion 1222, and the third rod portion 1223. The first rod portion 1221 is connected to the magnet 121, such as being hollow and having the first rod portion 1221 inserted into the magnet 121.

[0077] Exemplarily, the magnet 121 includes a first magnet portion 1211 and a second magnet portion 1212 connected in sequence, and the first magnet portion 1211 and the second magnet portion 1212 together enclose a cavity forming the magnet 121. The magnet 121 also includes an intermediate magnet portion 1213 connected between the first magnet portion 1211 and the second magnet portion 1212, and the intermediate magnet portion 1213 is hollow.

[0078] The first rod portion 1221 is connected to the first magnet portion 1211, and the end of the first rod portion 1221 away from the second rod portion 1222 can abut against the intermediate magnet portion 1213. The second rod portion 1222 is located outside the first magnet portion 1211 and can abut against the end surface of the first magnet portion 1211. The third rod portion 1223 can pass through the inlet 225 and be inserted into the connecting groove 224. The drive connecting portion 223 can cover the third rod portion 1223 to achieve the connection between the connecting rod 122 and the flexible shell body 222.

[0079] Exemplarily, the magnet 121 and the connecting rod 122 can be connected by screws. For example, the cavity of the magnet 121 can accommodate a screw, and the screw can extend from one side of the second magnet portion 1212 into the cavity of the magnet 121 and then be connected to the connecting rod 122. It should be understood that in the process of connecting the magnet 121 and the connecting rod 122, the screw also needs to pass through the intermediate magnet portion 1213. In an optional embodiment of the present application, the screw can connect the intermediate magnet portion 1213 and the first rod portion 1221 together to achieve the connection between the magnet 121 and the connecting rod 122.

[0080] As shown in Figure 5, when the magnet 121 moves to the front end of the cylinder 111, the magnet 121 and the first ferromagnetic element 113 are attracted, and the magnet 121 pushes the flexible shell 22 to the position where the volume of the accommodating chamber C3 is minimized. Due to the attractive force between the magnet 121 and the first ferromagnetic element 113, the magnet 121 and the flexible shell 22 can remain in their current position even if the current to the coil 112 is stopped. If it is necessary to move the flexible shell 22 toward the maximum volume of the accommodating chamber C3 to absorb gas, the direction of the current flowing into the coil 112 can be changed to move the magnet 121 toward the rear end of the cylinder 111.

[0081] As shown in Figure 6, when the magnet 121 moves to the rear end of the cylinder 111, the magnet 121 and the second ferromagnetic element 114 are attracted. At this time, the magnet 121, through the connecting rod 122, stretches the flexible shell 22 to the position where the volume of the accommodating chamber C3 is maximized. Due to the attractive force between the magnet 121 and the second ferromagnetic element 114, the magnet 121 and the flexible shell 22 can remain in their current position even if the current flowing into the coil 112 is stopped. If it is necessary to move the flexible shell 22 toward the direction where the volume of the accommodating chamber C3 is minimized to expel gas, the direction of the current flowing into the coil 112 is changed to move the magnet 121 toward the front end of the cylinder 111.

[0082] When the magnet 121 and the first ferromagnetic element 113 are attracted to each other, the driving device 10 is in the first state. Magnet 121 and connecting rod 122 drive the flexible shell 222 and the rigid shell 211 to fit together. At this point, the volume of the accommodating cavity C3 is minimal, approximately zero. This means that the pump body 20 is in the first state.

[0083] When the magnet 121 and the second ferromagnetic element 114 are attracted to each other, the driving device 10 is in the second state, the flexible shell 222 and the rigid shell 211 are separated, and the volume of the accommodating cavity C3 is at its maximum.

[0084] It should be noted that the overall deformation of the pump body 20 in this embodiment of the application is caused by the flexible shell body 222. Therefore, when the pump body 20 is in the first state, it can also be understood that the flexible shell body 222 is in the first state. When the pump body 20 is in the second state, it can also be understood that the flexible shell body 222 is in the second state. In other words, the drive device 10 can drive the pump body 20 to deform and switch between the first state and the second state, or in other words, the drive device 10 can drive the flexible shell body 222 to deform and switch between the first state and the second state.

[0085] Exemplarily, the pump body 20 further includes a plug-in portion 214 for connecting to a gas detector such as an alcohol detector 2 of an alcohol detector. The channel 213 passes through the rigid shell body 211 and the plug-in portion 214.

[0086] Exemplarily, the rigid shell body 211 is bowl-shaped, and the side of the rigid shell body 211 that can fit with the flexible shell body 222 is a concave surface. When the side of the flexible shell body 222 that is close to the rigid shell body 211 fits with the rigid shell body 211, the side of the flexible shell body 222 that is close to the rigid shell body 211 is convex. Exemplarily, when the pump body 20 is in the first state, that is, when the accommodating chamber C3 is in the smallest volume state, the flexible shell body 222 and the rigid shell body 211 can completely fit together, so that the gas in the accommodating chamber C3 is fully discharged to reduce residual gas. When the flexible shell body 222 is away from the rigid shell body 211, such as when the pump body 20 is in the second state, the side of the flexible shell body 222 that is close to the rigid shell body 211 is concave.

[0087] Exemplarily, the thickness of the flexible edge 221 is greater than the thickness of the flexible shell body 222 to enhance the sealing effect between the flexible edge 221 and the first connecting portion 212. Exemplarily, the first connecting portion 212 is provided with a first sealing groove G1 for accommodating at least a portion of the flexible edge 221. At least a portion of the flexible edge 221 is placed in the first sealing groove G1 to achieve a sealed connection between the flexible edge 221 and the first connecting portion 212.

[0088] Exemplarily, the first sealing groove G1 is an annular groove. It should be understood that the embodiment of the present application does not limit the type or shape of the first sealing groove G1.

[0089] In other optional embodiments, the first sealing groove G1 may be provided on the inner side of the connection between the rigid shell body 211 and the first connecting portion 212 .

[0090] In order to further enhance the sealing effect of the first connecting portion 212 and the flexible edge 221, the barrel 111 of the embodiment of the present application is further connected to the flexible edge 221 and the first connecting portion 212. Exemplarily, the flexible edge 221 includes a first sealing portion 2211 and a second sealing portion 2212 connected to each other, the first sealing portion 2211 being installed in the first sealing groove G1, and the second sealing portion 2212 being connected to the barrel 111. Exemplarily, the second sealing portion 2212 is connected to the second connecting portion 1114, and the second connecting portion 1114 is located on the side of the front flange 1112 away from the rear flange 1113, or in other words, the second connecting portion 1114 is closer to the pump body 20 than the front flange 1112.

[0091] Illustratively, the second connecting portion 1114 is provided with a second sealing groove G2 for accommodating the second sealing portion 2212. The second sealing groove G2 is located at the end of the second connecting portion 1114 away from the front flange 1112. The second sealing portion 2212 is installed in the second sealing groove G2, and the second sealing portion 2212 is sealedly connected to the second connecting portion 1114. It will be appreciated that the first sealing portion 2211 is disposed in the first sealing groove G1 to form a seal with the first connecting portion 212, and the second sealing portion 2212 is disposed in the second sealing groove G2 to form a seal with the second connecting portion 1114. This results in a joint, sealed connection between the cylindrical body 111 and the rigid shell 21 and the flexible shell 22, significantly enhancing the stability and sealing properties of the connection between the flexible shell 22 and the rigid shell 21.

[0092] Exemplarily, the first sealing portion 2211 and the second sealing portion 2212 are respectively located on opposite sides of the edge of the flexible shell body 222, and the first sealing portion 2211 and the second sealing portion 2212 of the flexible edge 221 can be sunk into the first sealing groove G1 and the second sealing groove G2 by deformation, and the first connecting portion 212 and the second connecting portion 1114 jointly press the flexible edge 221 from both sides of the flexible edge 221 to achieve sealing of the flexible edge 221.

[0093] Exemplarily, the first connecting portion 212 and the second connecting portion 1114 are connected to confine the flexible shell 22 within the barrel 111 and the rigid shell 21. Both the first connecting portion 212 and the second connecting portion 1114 are annular, and the inner sidewall of the first connecting portion 212 matches the outer sidewall of the second connecting portion 1114. The first connecting portion 212 is sleeved onto the second connecting portion 1114, thereby covering the flexible edge 221. Therefore, in the embodiment of the present application, the flexible shell 22 is enclosed by the barrel 111 and the rigid shell 21 and is not exposed. This not only greatly improves the sealing performance of the flexible shell 22, but also prevents the flexible shell 22 from being exposed and easily damaged. It also prevents the flexible shell 22 from being exposed and causing unstable deformation. The second connecting portion 1114 is provided with a groove G3 that communicates with the second sealing groove G2, and the first connecting portion 212 is mounted in the groove G3. Exemplarily, the groove G3 is an annular groove.

[0094] It should be noted that the connection relationship between the first connection portion 212 and the second connection portion 1114 is not limited to the first connection portion 212 being sleeved on the second connection portion 1114. In other optional embodiments, the second connection portion 1114 is sleeved on the first connection portion 212.

[0095] The first connecting portion 212 and the second connecting portion 1114 are further provided with corresponding screw holes, which are secured to the first connecting portion 212 and the second connecting portion 1114 by screws 30. Thus, the front cavity C1 is formed by the barrel body 1111, the front flange 1112, the second connecting portion 1114, the flexible shell 22, and the magnet 121. In other embodiments, the first connecting portion 212 and the second connecting portion 1114 may also be secured to each other by other means, such as threaded engagement or interference fit.

[0096] In the embodiment of the present application, the cylinder 111, the coil 112, the first ferromagnetic element 113, and the second ferromagnetic element 114 are combined to form a stator 11. The magnet 121 and the connecting rod 122 are combined to form a mover 12. That is, the driving device 10 includes the stator 11 and the mover 12.

[0097] In this embodiment, the electromagnetic reciprocating pump 1 of the present invention is used for gas transportation as an example, but the electromagnetic reciprocating pump 1 of the present invention is not limited to the use in gas transportation, and can also be used for the transportation of various fluids such as liquids. The principles of application to other types of fluid transportation are basically the same as those of application to gas transportation.

[0098] As shown in FIG7 , an embodiment of the present application provides an alcohol detector 1000 comprising an electromagnetic reciprocating pump 1. The alcohol detector 1000 of the present invention further comprises a mouthpiece 3 and an alcohol detection device 2, wherein the mouthpiece 3, the alcohol detection device 2, and the electromagnetic reciprocating pump 1 are sequentially connected. In the initial state, the magnet 121 is attracted to the first ferromagnetic element 113, and the accommodating chamber C3 is at its minimum volume. When an alcohol test is required and the subject blows into the mouthpiece 3, the following steps are performed:

[0099] S1: A positive current is passed through the coil 112. The magnetic field generated by the coil 112 applies a driving force on the magnet 121 in a direction away from the pump body 20. The magnet 121 breaks away from the attracted state with the first ferromagnetic element 113, moves to the rear end of the cylinder 111 and is attracted by the second ferromagnetic element 114. During this process, the magnet 121 drives the flexible shell 22 to deform through the connecting rod 122, so that the accommodating chamber C3 is converted from the smallest volume state to the largest volume state. The accommodating chamber C3 draws the gas to be tested into the alcohol detection device 2.

[0100] S2: Stop supplying current to the coil 112 and detect the concentration of the gas to be tested through the alcohol detection device 2.

[0101] S3: After the set time interval has elapsed and the alcohol detection device 2 has completed detection, a reverse current is applied to the coil 112. The magnetic field generated by the coil 112 exerts a driving force on the magnet 121 in the direction toward the pump body 20. The magnet 121 breaks away from the attraction with the second ferromagnetic element 114, moves to the front side of the cylinder 111, and is attracted by the first ferromagnetic element 113. During this process, the magnet 121 causes the flexible shell 22 to deform via the connecting rod 122, causing the accommodating chamber C3 to change from a maximum volume state to a minimum volume state. The accommodating chamber C3 then discharges the gas to be tested from the alcohol detection device 2.

[0102] S4: Stop supplying current to the coil 112, and the alcohol detection process is completed.

[0103] Wherein, the alcohol detection device 2 is, for example, an alcohol sensor.

[0104] In another embodiment, as shown in FIG8 , the electromagnetic reciprocating pump 1a shown in FIG8 differs from the electromagnetic reciprocating pump 1 in that the first ferromagnetic element 113a in the electromagnetic reciprocating pump 1a is disposed on the side of the rigid shell 21a away from the barrel 111a. It should be understood that, compared to the electromagnetic reciprocating pump 1 , the end of the barrel 111a closer to the rigid shell 21a does not require a structure for mounting the first ferromagnetic element 113a, such as a first ferromagnetic element mounting slot.

[0105] Illustratively, a first ferromagnetic element installation groove 215 a is defined on a side of the hard shell 21 a away from the cylinder 111 , and the first ferromagnetic element 113 a is installed in the first ferromagnetic element installation groove 215 a .

[0106] In other optional embodiments, the first ferromagnetic element 113 a is directly mounted on a surface of the hard shell 21 a away from the cylinder 111 .

[0107] It should be understood that other structures of the hard shell 21 a and the cylinder 111 a may refer to the hard shell 21 and the cylinder 111 a .

[0108] Among them, the flexible shell 22a, magnet 121a, connecting rod 122a, coil 112a and second ferromagnetic element 114a in the electromagnetic reciprocating pump 1a can all refer to the flexible shell 22, magnet 121, connecting rod 122, coil 112, and second ferromagnetic element 114 in the electromagnetic reciprocating pump 1, and will not be repeated here.

[0109] It should be understood that the electromagnetic reciprocating pump 1a shown in FIG. 8 can be applied to the alcohol detector 1000 shown in FIG. 7 .

[0110] The electromagnetic reciprocating pump and alcohol detector provided in the embodiments of the present application are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for those skilled in the art, according to the ideas of the present application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. An electromagnetic reciprocating pump, wherein: It comprises a driving device (10) and a pump body (20): The pump body (20) comprises a flexible shell (22), a receiving chamber (C3), and a channel (213) communicating with the receiving chamber (C3), wherein the channel (213) is used to connect the receiving chamber (C3) with the outside world; The driving device (10) comprises: a cylinder (111), a coil (112) and a magnet (121); the coil (112) generates magnetic fields in different directions by changing the direction of current to drive the magnet (121) in the cylinder (111) to move forward and backward along a movement direction (D1); The driving device (10) further comprises: a first ferromagnetic element (113) and a second ferromagnetic element (114), wherein the first ferromagnetic element (113) and the second ferromagnetic element (114) are spaced apart at the front and rear ends along the moving direction (D1) of the magnet (121), the first ferromagnetic element (113) and the second ferromagnetic element (114) are both capable of attracting the magnet (121), and after the magnet (121) moves to one end, it is attracted to one of the first ferromagnetic element (113) and the second ferromagnetic element (114) and is maintained at the position; The magnet (121) is connected to the flexible shell (22) of the pump body (20). When the magnet (121) moves forward and backward, it drives the flexible shell (22) to deform and change the volume of the accommodating chamber (C3) to achieve fluid suction and discharge.

2. The electromagnetic reciprocating pump according to claim 1, wherein: The pump body (20) further includes a hard shell (21), the flexible shell (22) and the hard shell (21) are sealed and connected to define the accommodating chamber (C3), the magnet (121) is connected to the flexible shell (22), and the magnet (121) is used to drive the flexible shell (22) to deform relative to the hard shell (21) to change the volume of the accommodating chamber (C3).

3. The electromagnetic reciprocating pump according to claim 2, wherein: The flexible shell (22) includes a flexible shell body (222) and a flexible edge (221) arranged along the edge of the flexible shell body (222); the hard shell (21) includes a hard shell body (211) and a first connecting portion (212) arranged along the edge of the hard shell body (211); the flexible edge (221) and the first connecting portion (212) are sealed and connected; When the magnet (121) and the first ferromagnetic element (113) are attracted to each other, the flexible shell body (222) and the rigid shell body (211) are fitted together, and the volume of the accommodating cavity (C3) is minimized; When the magnet (121) and the second ferromagnetic element (114) are attracted to each other, the flexible shell body (222) and the rigid shell body (211) are separated, and the volume of the accommodating cavity (C3) is maximized.

4. The electromagnetic reciprocating pump according to claim 3, wherein: The flexible edge (221) includes a first sealing portion (2211) and a second sealing portion (2212); The first connecting portion (212) is provided with a first sealing groove (G1) for accommodating the first sealing portion (2211); the cylinder (111) comprises a cylinder body (1111) and a second connecting portion (1114) connected to the cylinder body (1111); the second connecting portion (1114) is provided with a second sealing groove (G2) for accommodating the second sealing portion (2212); The second connecting portion (1114) is connected to the first connecting portion (212), the first sealing portion (2211) is arranged in the first sealing groove (G1) to form a seal with the first connecting portion (212), and the second sealing portion (2212) is arranged in the second sealing groove (G2) to form a seal with the second connecting portion (1114).

5. The electromagnetic reciprocating pump according to claim 4, wherein: The thickness of the flexible edge (221) is greater than the thickness of the flexible shell body (222).

6. The electromagnetic reciprocating pump according to claim 3, wherein: The flexible shell (22) further includes a drive connection portion (223), and the drive connection portion (223) is arranged in the middle of the outer surface of the flexible shell body (222); The driving device (10) further comprises a connecting rod (122), one end of the connecting rod (122) being connected to the driving connection portion (223), and the other end of the connecting rod (122) being connected to the magnet (121).

7. The electromagnetic reciprocating pump according to claim 3, wherein: The hard shell body (211) is bowl-shaped, and the side of the hard shell body (211) that can fit with the flexible shell body (222) is an inner concave surface.

8. The electromagnetic reciprocating pump according to claim 2, wherein: The cylinder (111) and the hard shell (21) are jointly and sealedly connected to the flexible shell (22); The cylinder (111) and the hard shell (21) are connected to cover the flexible shell (22) to prevent the flexible shell (22) from being exposed.

9. The electromagnetic reciprocating pump according to claim 2, wherein: The first ferromagnetic element (113) is arranged at one end of the cylinder (111) close to the pump body (20), or the first ferromagnetic element (113) is arranged at a side of the hard shell (21) away from the cylinder (111); The second ferromagnetic element (114) is arranged at an end of the cylinder (111) away from the pump body (20).

10. The electromagnetic reciprocating pump according to claim 1, wherein: The front end of the cylinder (111) is tightly connected to the pump body (20), and the cylinder (111), the pump body (20) and the magnet (121) enclose a front cavity (C1).

11. The electromagnetic reciprocating pump according to claim 10, wherein: The cylinder (111) is provided with a first air hole (T1) for connecting the front cavity (C1) with the outside.

12. The electromagnetic reciprocating pump according to claim 1, wherein: A partition plate (115) is provided at the rear end of the cylinder (111), and a rear cavity (C2) is formed between the cylinder (111), the partition plate (115) and the magnet (121).

13. The electromagnetic reciprocating pump according to claim 12, wherein: The partition (115) is provided with a second air hole (T2) for connecting the rear cavity (C2) with the outside.

14. The electromagnetic reciprocating pump according to claim 12, wherein: The front end of the cylinder (111) is tightly connected to the pump body (20), and the cylinder (111), the pump body (20) and the magnet (121) enclose a front cavity (C1); A gap is formed between the magnet (121) and the cylinder (111), thereby forming a channel connecting the front cavity (C1) and the rear cavity (C2).

15. The electromagnetic reciprocating pump according to claim 1, wherein The cylinder (111) comprises a cylinder body (1111), a front flange (1112) and a rear flange (1113), wherein the front flange (1112) and the rear flange (1113) are both arranged on the outside of the cylinder body (1111), and the front flange (1113) and the rear flange (1114) are respectively located at the front end and the rear end of the cylinder body (1111); The front flange (1112) and the rear flange (1113) form an installation space (1115) on the outside of the cylinder body (1111), and the coil (112) is installed in the installation space (1115).

16. An alcohol detector, wherein: The alcohol detector includes an electromagnetic reciprocating pump, which includes: Driving device (10) and pump body (20): The pump body (20) comprises a flexible shell (22), a receiving chamber (C3), and a channel (213) communicating with the receiving chamber (C3), wherein the channel (213) is used to connect the receiving chamber (C3) with the outside world; The driving device (10) comprises: a cylinder (111), a coil (112) and a magnet (121); the coil (112) generates magnetic fields in different directions by changing the direction of current to drive the magnet (121) in the cylinder (111) to move forward and backward along a movement direction (D1); The driving device (10) further comprises: a first ferromagnetic element (113) and a second ferromagnetic element (114), wherein the first ferromagnetic element (113) and the second ferromagnetic element (114) are spaced apart at the front and rear ends along the moving direction (D1) of the magnet (121), the first ferromagnetic element (113) and the second ferromagnetic element (114) are both capable of attracting the magnet (121), and after the magnet (121) moves to one end, it is attracted to one of the first ferromagnetic element (113) and the second ferromagnetic element (114) and is maintained at the position; The magnet (121) is connected to the flexible shell (22) of the pump body (20). When the magnet (121) moves forward and backward, it drives the flexible shell (22) to deform and change the volume of the accommodating chamber (C3) to achieve fluid suction and discharge.

17. The alcohol detector according to claim 1, wherein: The pump body (20) further includes a hard shell (21), the flexible shell (22) and the hard shell (21) are sealed and connected to define the accommodating chamber (C3), the magnet (121) is connected to the flexible shell (22), and the magnet (121) is used to drive the flexible shell (22) to deform relative to the hard shell (21) to change the volume of the accommodating chamber (C3).

18. The alcohol detector according to claim 17, wherein: The flexible shell (22) includes a flexible shell body (222) and a flexible edge (221) arranged along the edge of the flexible shell body (222); the hard shell (21) includes a hard shell body (211) and a first connecting portion (212) arranged along the edge of the hard shell body (211); the flexible edge (221) and the first connecting portion (212) are sealed and connected; When the magnet (121) and the first ferromagnetic element (113) are attracted to each other, the flexible shell body (222) and the rigid shell body (211) are fitted together, and the volume of the accommodating cavity (C3) is minimized; When the magnet (121) and the second ferromagnetic element (114) are attracted to each other, the flexible shell body (222) and the rigid shell body (211) are separated, and the volume of the accommodating cavity (C3) is maximized.

19. The alcohol detector according to claim 18, wherein: The flexible edge (221) includes a first sealing portion (2211) and a second sealing portion (2212); The first connecting portion (212) is provided with a first sealing groove (G1) for accommodating the first sealing portion (2211); the cylinder (111) comprises a cylinder body (1111) and a second connecting portion (1114) connected to the cylinder body (1111); the second connecting portion (1114) is provided with a second sealing groove (G2) for accommodating the second sealing portion (2212); The second connecting portion (1114) is connected to the first connecting portion (212), the first sealing portion (2211) is arranged in the first sealing groove (G1) to form a seal with the first connecting portion (212), and the second sealing portion (2212) is arranged in the second sealing groove (G2) to form a seal with the second connecting portion (1114).

20. The alcohol detector according to claim 18, wherein: The flexible shell (22) further includes a drive connection portion (223), and the drive connection portion (223) is arranged in the middle of the outer surface of the flexible shell body (222); The driving device (10) further comprises a connecting rod (122), one end of the connecting rod (122) being connected to the driving connection portion (223), and the other end of the connecting rod (122) being connected to the magnet (121).

Images