JP6602077B2 - Electromagnetic pump - Google Patents

Description

  The present invention relates to an electromagnetic pump.

  The electromagnetic pump is a pump configured to suck and discharge fluid in accordance with linear reciprocal vibration of a vibrator by an electromagnetic coil. 2. Description of the Related Art Conventionally, as this type of electromagnetic pump, one having a protection device that detects an abnormality of a vibrator and automatically stops the vibrator is known. For example, Patent Documents 1 and 2 disclose this type of electromagnetic pump.

  The protection device for an electromagnetic pump disclosed in Patent Document 1 includes a detection lever that operates in an abnormal state in which the amplitude of reciprocating vibration of the vibrator is larger than that in a normal state. This protection device is configured to switch a power supply switch to an OFF state when the detection lever is pressed by the claw of the vibrator and rotates when an abnormality occurs. Further, the protection device for an electromagnetic pump disclosed in Patent Document 2 includes a case where the vibrator is displaced in a reciprocating vibration direction (hereinafter also referred to as “first direction”) with a stroke larger than a normal stroke, and the vibrator Is provided with a rotating member that operates in any abnormality when the is displaced in a direction orthogonal to the reciprocating vibration direction (hereinafter also referred to as “second direction”). This protection device is configured to switch the power supply switch to the OFF state by rotating the rotating member pressed by the boss portion of the vibrator in an abnormal state. In the case of this configuration, the rotating member rotates along an intersecting surface with the first direction in which the vibrator reciprocates due to a load received from the boss portion of the vibrator.

JP 2005-155517 A JP 2008-280970 A

  The protection device disclosed in Patent Document 2 detects not only an abnormal displacement in the first direction of the vibrator but also an abnormal displacement in the second direction of the vibrator and automatically stops the vibrator. It is configured. Therefore, this protection device is effective in reliably detecting and dealing with the abnormality of the vibrator as compared with the case where only the abnormal displacement in the first direction of the vibrator is detected. However, the rotating member of the protection device has a rotating direction different from the linear reciprocating vibration direction of the vibrator, and is configured to rotate while moving relative to the vibrator. In the case of this configuration, the driving force of the vibrator is not easily transmitted to the rotating member, which is disadvantageous for improving the operability of the protection device.

  Accordingly, the present invention has been made in view of the above points, and one of its purposes is to provide protection in an electromagnetic pump provided with a protection device that automatically detects an abnormality of a vibrator and stops the vibrator. It is to provide an effective technique for improving the operability of the apparatus.

  In order to achieve the above object, an electromagnetic pump (100) according to the present invention includes a diaphragm (152), a vibrator (140), a pair of electromagnetic coils (121a, 131a), a protection device (200), . The diaphragm (152) is elastically deformable so as to perform a fluid suction operation and a discharge operation. The vibrator (140) has permanent magnets (141a, 141b) and is connected to the diaphragm (152). The pair of electromagnetic coils (121a, 131a) are arranged on both sides of the vibrator (140), and the vibrator (140) reciprocally vibrates while elastically deforming the diaphragm (152). ). The protection device (200) stops power supply to the pair of electromagnetic coils (121a, 131a) when the vibrator (140) is abnormal. The protection device (200) includes a striker (143) provided on the vibrator (140) and a movable member (220) disposed on the movement axis (L2) of the striker (143). The movable member (220) contacts the striker (143) in the first displacement state in which the displacement in the first direction (X1) during the reciprocating vibration of the vibrator (140) is equal to or greater than the first reference value (V1). The first direction (X1) is united with the vibrator (140) to the power cutoff position (P2) that is pressed in the first direction (X1) by contact to cut off the pair of electromagnetic coils (121a, 131a) and the power source. ), The vibrator (140) is displaced in the second direction (Y1) intersecting the first direction (X1), and the displacement in the first direction (X1) during the reciprocating vibration of the vibrator (140) is the first. In a second displacement state that is equal to or greater than a second reference value (V2) that is smaller than one reference value (V1), it is pressed in the first direction (X1) by contact with the striker (140), and the power cutoff position ( P2) and integrated with the vibrator (140) Configured to move to the direction (X1).

  The protection device of this configuration can detect not only an abnormal displacement in the first direction of the vibrator but also an abnormal displacement in the second direction of the vibrator and can automatically stop the vibrator. Therefore, it is effective in reliably detecting and dealing with the abnormality of the vibrator as compared with the case where only the abnormal displacement in the first direction of the vibrator is detected. In particular, the displacement in the first direction of the vibrator until the striker contacts the movable member in the second displacement state is lower than the displacement in the first displacement state. In short, in the second displacement state, the protection device operates even if the displacement in the first direction is smaller than in the first displacement state. Thereby, when the vibrator is displaced in the second direction in the second displacement state, the vibrator can be prevented from coming into contact with the electromagnetic coil, or even if the vibrator is brought into contact with the electromagnetic coil. The contact time can be kept short. Furthermore, the movable member is configured to move integrally with the vibrator in the same direction as the vibrator when pressed by the striker in both the first displacement state and the second displacement state. Thereby, the resultant force of the magnetic force received by the vibrator from the pair of electromagnetic coils and the inertial force of the vibrator is transmitted to the movable member as a driving force. As a result, the movable member can be reliably moved to the power cutoff position, and the operability of the protection device can be improved.

  In the electromagnetic pump (100) configured as described above, the movable member (220) has an engagement arm (224) extending in the second direction (Y2) and an insertion space (227) in the second direction (Y2). Two engagement protrusions (225, 226) extending from the engagement arm (224) in a direction intersecting both the first direction (X1) and the second direction (Y1) in a state of being separated from each other. It is preferable to provide. The two engaging protrusions (225, 226) of the movable member (220) constitute a gate structure having an insertion space (227) in a region facing each other. The striker (143) includes a first engagement portion (143a) configured to face the engagement arm (224) and have a size in the second direction (Y1) less than the insertion space (227), It is preferable to include a second engagement portion (143b) that is further away from the engagement arm (224) than the first engagement portion (143a) in the direction (X1). In this case, in the first displacement state of the vibrator (140), the first engaging portion (143a) of the striker (143) enters the insertion space (227) of the movable member (220) and the first of the striker (143). The two engaging portions (143b) are preferably in contact with the engaging arms (224) of the movable member (220). Further, in the second displacement state of the vibrator (140), the first of the striker (143) when the vibrator (140) moves in the first direction (X1) with a displacement lower than that in the first displacement state. It is preferable that the engaging portion (143a) is in contact with one of the two engaging protrusions (225, 226) of the movable member (220). According to this configuration, the structure of the movable member can be simplified by using the movable member having the gate structure.

  In the electromagnetic pump (100) having the above-described configuration, the striker (143) is configured such that the first engagement portion (143a) and the second engagement portion (143b) are integrally formed, and the first engagement portion (143a). Of these, the first engagement surface (144) that contacts one of the two engagement protrusions (225, 226) of the movable member (220) and the movable member (220 of the second engagement portion (143b)). It is preferable that a step structure is formed by the second engagement surface (145) that abuts on the engagement arm (224). According to this configuration, the structure of the striker can be simplified.

  In the electromagnetic pump (100) configured as described above, the engagement arm (224) and the two engagement protrusions (225, 226) of the movable member (220) have a uniform plate thickness in the first direction (X1). It is preferable that it is constituted by a plate-shaped portion. According to this configuration, the structure of the movable member can be simplified.

  In the above description, in order to help the understanding of the invention, the reference numerals used in the embodiments are attached to the configuration of the invention corresponding to the embodiment in parentheses, but each constituent element of the invention is the reference numeral. It is not limited to the embodiment defined by.

  As described above, according to the present invention, it is possible to improve the operability of the protective device in the electromagnetic pump provided with the protective device that detects abnormality of the vibrator and stops the pump.

FIG. 1 is a plan view of the electromagnetic pump according to the present embodiment, and is a view showing a cross-sectional structure of a main part thereof. FIG. 2 is a side view of the vibrator in FIG. FIG. 3 is a view of the periphery of the protective device of the electromagnetic pump in FIG. 1 as viewed from the left side in the figure. FIG. 4 is a plan view of the holder of the protection device in FIG. FIG. 5 is a plan view of the protection device in FIG. 3, showing a part of the holder in a broken state. FIG. 6 is a perspective view of the striker and the movable member. FIG. 7 is a diagram showing a state of reciprocal vibration in the normal stroke of the vibrator in FIG. FIG. 8 is a diagram showing the relative positions of the striker and the movable member in FIG. FIG. 9 is a diagram illustrating a state immediately before the vibrator is displaced only in the first direction and the striker contacts the movable member in FIG. 5. FIG. 10 is a diagram showing the relative positions of the striker and the movable member in FIG. FIG. 11 is a diagram illustrating a state in which the vibrator is further displaced in the first direction in FIG. 9 and the protection device is activated. FIG. 12 is a diagram illustrating a state in which the protection device is activated in FIG. 3. FIG. 13 is a diagram illustrating a state immediately before the striker contacts the movable member when the vibrator is displaced in the second direction and the first direction in FIG. 5. FIG. 14 is a diagram showing the relative positions of the striker and the movable member in FIG. FIG. 15 is a diagram illustrating a state in which the vibrator is further displaced in the first direction in FIG. 13 and the protection device is activated. FIG. 16 is a perspective view showing a reference example of the striker and the movable member in FIG.

  Hereinafter, an embodiment of an electromagnetic pump according to the present invention will be described with reference to the drawings. This electromagnetic pump is typically used as an air pump for supplying air to the water to be treated in the septic tank, and an air pump for supplying driving air to an air lift pump for transferring the water to be treated in the septic tank. Is done.

  In the drawings for explaining the electromagnetic pump, the front-rear direction (first direction) of the electromagnetic pump is indicated by an arrow X, the left-right direction (second direction) is indicated by an arrow Y, and the up-down direction (third direction) is indicated. This is indicated by an arrow Z. The front-rear direction X can be referred to as the left-right direction, and the left-right direction Y can also be referred to as the front-rear direction. The front-rear direction X is a direction that intersects both the left-right direction Y and the up-down direction Z of the electromagnetic pump. The front-rear direction X substantially matches the direction in which a later-described vibrator constituting the electromagnetic pump linearly reciprocates. Among the longitudinal directions X, a predetermined displacement direction of the vibrator is indicated by an arrow X1, and a direction opposite to the displacement direction X1 is indicated by an arrow X2. The left-right direction Y is a direction that intersects both the front-rear direction X and the up-down direction Z of the electromagnetic pump. A predetermined displacement direction of the vibrator in the left-right direction Y is indicated by an arrow Y1.

  As shown in FIG. 1, the electromagnetic pump 100 includes a casing 101 that houses pump components. The pump components include a pump mechanism 110 and a protection device 200. The pump mechanism 110 generally performs the function of sucking air as a fluid, compressing it, increasing its pressure, and discharging it. The pump mechanism 110 is disposed on a pump base plate (not shown) via vibration isolation means (vibration isolation rubber or the like). The protection device 200 generally functions to stop the pump mechanism 110 by detecting an abnormality in the pump mechanism 110 (vibrator 140 described later) in order to protect the pump. The protection device 100 is also referred to as an auto stopper that automatically stops the pump mechanism 110.

  The pump mechanism 110 includes an electromagnet case 111 configured by two electromagnet case plates 111a and 111a each having a metal plate shape. In the electromagnet case 111, a pair of electromagnets (solenoids) 120 and 130 are accommodated in a facing space where the two electromagnet case plates 111a and 111a face each other. The electromagnet case 111 forms a magnetic path by the electromagnets 120 and 130 by contacting the electromagnets 120 and 130. One electromagnet 120 and the other electromagnet 130 are arranged with a gap 112 in the left-right direction Y. In the gap 112, the vibrator 140 is provided so as not to contact the electromagnets 120 and 130. Diaphragm mechanisms 150 are provided on both sides of the electromagnet case 111 in the front-rear direction X, respectively. The diaphragm mechanism 150 is connected to the main body 141 of the vibrator 140.

  The electromagnet 120 includes an electromagnet bobbin 121 and an electromagnet core 122. An electromagnetic coil (also referred to as “excitation coil”) 121 a is wound around the electromagnet bobbin 121. A part of the electromagnet core 122 is inserted into the insertion space of the electromagnet bobbin 121. Thereby, the electromagnetic coil 121a is held by the electromagnet core 122. Similar to the electromagnet 120, the electromagnet 130 includes an electromagnet bobbin 131 and an electromagnet core 132. An electromagnetic coil (also referred to as “excitation coil”) 131 a is wound around the electromagnet bobbin 131. A part of the electromagnet core 132 is inserted into the insertion space of the electromagnet bobbin 131. Thereby, the electromagnetic coil 131a is held by the electromagnet core 132. Driving force (also referred to as “magnetic force”) is applied to the vibrator 140 by the cooperation of the electromagnetic coil 121 a of the electromagnet 120 and the electromagnetic coil 131 a of the electromagnet 130. As a result, the vibrator 140 reciprocates in two directions X1 and X2. The electromagnetic coil 121a and the electromagnetic coil 131a are arranged on both sides of the vibrator 140, and apply a magnetic force to the vibrator 140 so that the vibrator 140 reciprocates while elastically deforming a diaphragm 152 described later. Yes, and corresponds to “a pair of electromagnetic coils” of the present invention.

  The electromagnet bobbin 121 includes a metal connection terminal 123 and a connection terminal 124. The connection terminal 123 functions to connect one coil end 121b of the electromagnetic coil 121a to the (+) side connection wiring 102 which is a positive electrode of an AC power supply (not shown). On the other hand, the connection terminal 124 functions to connect the other coil end 121c of the electromagnetic coil 121a to a terminal plate 215 of the protection device 200 described later. Similar to the electromagnet bobbin 121, the electromagnet bobbin 131 includes a metal connection terminal 133 and a connection terminal 134. The connection terminal 133 functions to connect one coil end 131b of the electromagnetic coil 131a to the (−) side connection wiring 103 which is a negative electrode of an AC power supply (not shown). On the other hand, the connection terminal 134 functions to connect the other coil end 131c of the electromagnetic coil 131a to a terminal plate 216 of the protection device 200 described later.

  In the power supply path through which power is supplied from the AC power supply, the connection wiring 102, the electromagnetic coil 121 a, the protection device 200 (the terminal plate 215 and the terminal plate 216), the electromagnetic wave, in order from the (+) side to the (−) side The coil 131a and the connection wiring 103 are arranged in series. Therefore, when power is supplied to the power supply path in a state where the terminal plate 215 and the terminal plate 216 of the protection device 200 are in contact, the magnetic coils 121a and 131a of the electromagnets 120 and 130 have the same number of magnetic poles as the frequency of the AC power supply. Change (polarity change) occurs. This change in the magnetic poles causes reciprocal vibration of the vibrator 140 in which the permanent magnets (N pole and S pole) 141 a and 141 b are embedded in the main body 141. Further, the diaphragm mechanisms 150 and 150 are operated in accordance with the reciprocating vibration of the vibrator 140.

  The diaphragm mechanism 150 includes a main body 151 and a diaphragm 152. The diaphragm 152 is a disk-shaped member extending on a plane defined by both the left-right direction Y and the up-down direction Z of the electromagnetic pump. The outer peripheral edge of the diaphragm 152 is fixed to the main body 151. The diaphragm 152 is formed of a rubber material that can be elastically deformed so as to perform an air suction operation and a discharge operation. The central portion of the diaphragm 152 is sandwiched from both sides by a first center plate 153 and a second center plate 154 that are both fixed to the connecting shaft 142 of the vibrator 140. Therefore, the diaphragm 152 is indirectly connected to the vibrator 140 via the first center plate 153 and the second center plate 154. This diaphragm 152 corresponds to the “diaphragm” of the present invention.

  A valve case body 113 is provided on the opposite side of the diaphragm mechanism 150 from the electromagnet case 111. The valve case body 113 includes a suction chamber 114, a discharge chamber 115 and a compression chamber 116. The suction chamber 114 is a space for sucking air outside the pump as suction air from a suction port (not shown). The compression chamber 116 is a space for compressing the intake air sucked from the suction chamber 114. The discharge chamber 115 is a space for discharging the compressed air compressed in the compression chamber 116 toward a discharge port (not shown). The valve case body 113 includes a partition wall 113 a that partitions the suction chamber 114 and the compression chamber 116. A suction valve 117 is provided in a part of the partition wall 113a on the compression chamber 116 side. The suction valve 117 is made of an elastic rubber material and has a suction valve body (suction valve mechanism) that opens and closes the communication hole 113b formed in the partition wall 113a. The valve case body 113 includes a partition wall 113 c that partitions the discharge chamber 115 and the compression chamber 116. A discharge valve 118 is provided in a part of the partition wall 113c on the discharge chamber 115 side. The discharge valve 118 is made of an elastic rubber material like the suction valve 117, and has a discharge valve body (discharge valve mechanism) that opens and closes the communication hole 113d formed in the partition wall 113c.

  When the valve body of the suction valve 117 is open, the suction chamber 114 and the compression chamber 116 communicate with each other. On the other hand, when the valve body of the suction valve 117 is closed, the communication between the suction chamber 114 and the compression chamber 116 is prevented. Accordingly, the intake air flows from the suction chamber 114 to the compression chamber 116 only when the valve body of the suction valve 117 is open. On the other hand, when the valve body of the discharge valve 118 is open, the discharge chamber 115 and the compression chamber 116 communicate with each other. On the other hand, when the valve body of the discharge valve 118 is closed, the communication between the discharge chamber 115 and the compression chamber 116 is prevented. Therefore, compressed air flows from the compression chamber 116 into the discharge chamber 115 only when the valve body of the suction valve 118 is open.

  As shown in FIG. 2, the vibrator 140 includes a main body 141 in which permanent magnets (N pole and S pole) 141a and 141b having a square shape in a lateral view in the left-right direction Y and different polarities are embedded. The main body 141 includes connecting shafts 142 at both ends in the front-rear direction X, and is connected to the diaphragm 152 via the connecting shaft 142. This vibrator 140 corresponds to the “vibrator” of the present invention. A pair of left and right strikers 143 and 143 for operating the protection device 200 are provided on the upper end surface of the main body 141. This striker 143 corresponds to the “striker” of the present invention.

  The pair of left and right strikers 143 and 143 are arranged so as to be symmetrical with respect to a center line L1 which is separated from each other in the front-rear direction X and extends along the vertical direction Z. The striker 143 is configured integrally with the main body 141 so as to protrude from the upper end surface of the main body 141 of the vibrator 140. The striker 143 has a shape in which a first engagement portion 143a and a second engagement portion 143b protruding to a higher position than the first engagement portion 143a are integrated. Thereby, as for striker 143, the planar shape at the time of seeing from the left-right direction Y has comprised the substantially L shape. The striker 143 has a flat plate shape with a uniform thickness in the left-right direction Y. Accordingly, the first engagement portion 143a and the second engagement portion 143b are configured by flat plate-shaped portions having a uniform plate thickness in the left-right direction Y. The first engagement portion 143a and the second engagement portion 143b correspond to the “first engagement portion” and the “second engagement portion” of the present invention, respectively. The striker 143 contacts the first engagement surface 144 that abuts one of the two engagement protrusions 225 and 226 of the first engagement portion 143a, and the engagement arm 224 of the second engagement portion 143b. A step structure is formed by the second engaging surface 145 in contact therewith. According to this configuration, the structure of the striker 143 can be simplified, and the inexpensive vibrator 140 can be realized.

  A pair of left and right strikers 146 and 146 are provided on the lower end surface of the main body 141 of the vibrator 140. The striker 146 is configured integrally with the main body 141 so as to protrude from the lower end surface of the main body 141 of the vibrator 140. Similar to the striker 143, the striker 146 has a flat plate shape with a uniform thickness in the left-right direction Y. The striker 146 is a part used in place of the striker 143 when the vibrator 140 is turned upside down and used in an electromagnetic pump of another specification. The striker 146 performs substantially the same function as the striker 143. Thereby, one vibrator 140 can be used as a common part for a plurality of electromagnetic pumps.

  In the pump mechanism 110 configured as described above, when the vibrator 140 reciprocates in two directions X1 and X2 in accordance with the change in polarity of the electromagnets 120 and 130 connected to the AC power source, the vibrator 140 is positioned on both sides in the front-rear direction X. The diaphragm 152 that is elastically deformed in synchronization with the reciprocating vibration of the vibrator 140. That is, the diaphragm 152 is pulled or pushed in the front-rear direction X by the vibrator 140 while the outer peripheral portion thereof is fixed to the main body 151 side. As a result, the diaphragm 152 is elastically deformed in the front-rear direction X with the same displacement amount as the stroke of the vibrator 140.

  As shown in FIG. 1, when the left diaphragm 152 is elastically deformed in the first direction X1 during the operation of the vibrator 140 in the first direction X1, the left compression chamber 116 is pressurized. Since the left suction valve 117 is closed and the left discharge valve 118 is opened by this pressurization, the compressed air is discharged from the left compression chamber 116 to the left discharge chamber 115 through the communication hole 113d. (Discharge operation). Further, when the right diaphragm 152 is elastically deformed in the first direction X1 during the operation of the vibrator 140 in the first direction X1, the right compression chamber 116 becomes negative pressure. This negative pressure closes the right discharge valve 118 and opens the right suction valve 117, so that air is sucked from the right suction chamber 114 into the right compression chamber 116 through the communication hole 113b (suction). Operation). On the other hand, when the right diaphragm 152 is elastically deformed in the opposite direction X2 when the vibrator 140 is operated in the opposite direction X2 to the first direction X1, the right compression chamber 116 is pressurized. This pressurization closes the right suction valve 117 and opens the right discharge valve 118, so that compressed air is discharged from the right compression chamber 116 to the right discharge chamber 115 through the communication hole 113d. (Discharge operation). Further, when the left diaphragm 152 is elastically deformed in the opposite direction X2 during operation of the vibrator 140 in the opposite direction X2, the left compression chamber 116 becomes negative pressure. This negative pressure closes the left discharge valve 118 and opens the left suction valve 117, so that air is sucked from the left suction chamber 114 into the left compression chamber 116 through the communication hole 113b (suction). Operation). As described above, the suction operation and the discharge operation as described above are alternately repeated in each of the front and rear diaphragms 152, 152, whereby compressed air having a predetermined pressure and flow rate is continuously discharged.

  As shown in FIGS. 3 to 5, the protection device 200 includes a holder 210 and a movable member 220. Both the holder 210 and the movable member 220 are made of a resin material. The holder 210 extends along a plane defined by both the front-rear direction X and the left-right direction Y. The holder 210 includes a slide groove (slit) 211 that allows the slide movement in the front-rear direction X while holding the movable member 220. Although details will be described later, the movable member 220 includes a first protrusion 228 at one end in the left-right direction Y of the engagement arm 224 of the arm portion 222, and a second protrusion at the other end in the left-right direction Y of the engagement arm 224. 229. This movable member 220 corresponds to the “movable member” of the present invention.

  As shown in FIG. 3, the holder 210 is attached with a terminal plate 215 and a terminal plate 216, both of which are made of a flexible and conductive metal plate. The terminal plate 215 is electrically connected to the coil end 121c of the electromagnetic coil 121a via the connection terminal 124. The terminal plate 216 is electrically connected to the coil end 131c of the electromagnetic coil 131a via the connection terminal 134. Therefore, when the contact 215a of the terminal plate 215 and the contact 216a of the terminal plate 216 contact each other, power is supplied to the power supply path from the connection wiring 102 to the connection wiring 103, and the pump mechanism 110 is driven.

  As shown in FIG. 4, the slide groove 211 of the holder 210 extends in the left-right direction Y while intersecting the first groove portion 212 extending in the front-rear direction X and the center portion of the first groove portion 212 in the front-rear direction X. The second groove portion 213 is configured. The first groove 212 serves to guide the movable member 220 in the front-rear direction X. The second groove portion 213 is a region where the arm portion 222 of the movable member 220 is inserted in the slide groove 211. On the holder surface of the holder 210, a positioning display 210 a is provided on an extension line in the left-right direction Y of the second groove portion 213. The holder 210 also includes a locking piece 214 that extends downward from the back surface of the holder. The locking piece 214 is provided in the vicinity of the second groove 213. When the arm portion 222 of the movable member 220 is inserted into the second groove portion 213, the positioning display 221a provided on the operation portion 221 of the movable member 220 is aligned with the positioning display 210a, and the arm portion 222 of the movable member 220 is aligned. Are aligned along the second groove 213. Thereby, the movable member 220 can be reliably guided to the initial position. The movable member 220 is mounted at a predetermined initial position in the holder 210 by inserting the arm portion 222 into the second groove portion 213. When the movable member 220 is in the initial position, the first protrusion 228 and the second protrusion 229 are disposed along the second groove portion 213.

  As shown in FIG. 5, when the movable member 220 is at the initial position P1, the contact 216a of the terminal plate 216 is pressed by the first protrusion 228 of the movable member 220 so as to contact the contact 215a of the terminal plate 215. Further, when the movable member 220 is set to the initial position P1, the second protrusion 229 engages with the locking piece 214. At this time, the second protrusion 229 of the movable member 220 is strongly pressed against the locking piece 214 by the elastic recovery force that the engagement arm 224 receives from the contact point 216a. Therefore, the arm portion 222 of the movable member 220 is sandwiched between the contact point 216 a of the terminal plate 216 and the locking piece 214 in the left-right direction Y. As a result, the movable member 220 can be reliably locked at the initial position P1.

  As shown in FIG. 6, the striker 143 of the vibrator 140 is configured in a flat plate shape having a predetermined plate width D1 in the left-right direction Y. In the striker 143, the height in the vertical direction Z of the first engagement surface 144 is H1, and the height in the vertical direction Z of the second engagement surface 145 is H2. Therefore, the value obtained by adding the height H1 and the height H2 is the height (maximum height) of the striker 143 in the vertical direction Z.

  The movable member 220 includes an operation unit 221 and an arm unit 222. The operation unit 221 is operated by an operator's fingers when the movable member 220 is assembled to the holder 210. The positioning display 221 a is provided on the upper surface of the operation unit 221. The arm part 222 extends from the lower surface of the operation part 221. The arm portion 222 includes an integral extending arm 223 and an engaging arm 224.

  The extension arm 223 extends downward from the lower surface of the operation unit 221. The second protrusion 229 is provided in a region 223 a on the extension tip side of the extension arm 223. The engagement arm 224 extends in the left-right direction Y. The engagement arm 224 is on the movement axis L2 of the strikers 143 and 143 of the vibrator 140, and has a height corresponding to the second engagement surface 145 positioned higher than the first engagement surface 144 of the striker 143. Is arranged. This engagement arm 224 corresponds to the “engagement arm” of the present invention. The first protrusion 228 is provided in a region 224a of the engagement arm 224 opposite to the region 223a. The extension arm 223 and the engagement arm 224 have a substantially L-shaped planar shape when viewed from the front-rear direction X.

  The engagement arm 224 includes a first engagement protrusion 225 and a second engagement protrusion 226. The first engagement protrusion 225 and the second engagement protrusion 226 are directed downward from the engagement arm 224 in a state in which the insertion space 227 is spaced apart from each other in the left-right direction Y (both in the front-rear direction X and the left-right direction Y). (Crossing direction). That is, the first engagement protrusion 225 and the second engagement protrusion 226 form a structure (hereinafter also referred to as “gate structure”) having an insertion space 227 that opens downward in a region facing each other. According to this configuration, the structure of the movable member 220 can be simplified by using the movable member 220 having a gate structure. The first engagement protrusion 225 and the second engagement protrusion 226 correspond to “two engagement protrusions” of the present invention. Further, the extending arm 223, the engaging arm 224, and the two engaging protrusions 225 and 226 of the movable member 220 are configured by flat plate-shaped portions having a uniform plate thickness in the front-rear direction X. According to this configuration, the structure of the movable member 220 can be further simplified, and an inexpensive movable member 220 can be realized.

  The first engaging portion 143a of the striker 143 is configured such that the width D1 facing the engaging arm 224 and having the size in the left-right direction Y is less than the space width D2 of the insertion space 227. Therefore, when the insertion space 227 of the movable member 220 is positioned on the movement axis L2 of the strikers 143 and 143, the first engaging portion 143a (first) of the striker 143 is caused by the operation of the vibrator 140 with respect to the movable member 220 in the front-rear direction X. A portion having one engagement surface 144) can enter the insertion space 227 (become below the engagement arm 224). The second engaging portion 143b of the striker 143 has the same width D1 as the first engaging portion 143a, and is more distant from the engaging arm 224 in the front-rear direction X than the first engaging portion 143a.

  Hereinafter, the operation of the protection device 200 having the above configuration will be described with reference to FIGS. The protection device 200 operates to stop power supply to the pair of electromagnetic coils 121a and 131a when the vibrator 140 is abnormal (hereinafter also referred to as “pump abnormality”). This protection device 200 corresponds to the “protection device” of the present invention. In this embodiment, “when the pump is abnormal” is different from a state in which the pump mechanism 110 is operating normally (hereinafter also referred to as “when the pump is normal”) due to causes such as damage to the diaphragm 152. In this state, the vibrator 140 reciprocates.

  The vibrator 140 reciprocates in the front-rear direction X with a predetermined normal stroke when the pump is normal. On the other hand, when the pump is abnormal, the vibrator 140 reciprocally vibrates while being largely displaced in the front-rear direction X than when the pump is normal (hereinafter also referred to as “first displacement state”), and when the pump is normal. There is a case where reciprocal vibration occurs in the front-rear direction X (hereinafter also referred to as “second displacement state”) in a state biased in the left-right direction Y with respect to time. In the first displacement state, a problem may occur in which the vibrator 140 is greatly displaced in the front-rear direction X and contacts other components. In the second displacement state, the vibrator 140 may be biased in any one of the left and right directions Y, thereby causing a problem that the vibrator 140 contacts the electromagnetic coil 121a or the electromagnetic coil 131a. Therefore, the protection device 200 of the present embodiment is characterized by having a function capable of dealing with both the first displacement state and the second displacement state.

(When pump is normal)
As shown in FIG. 7, when the pump is normal, the insertion space 227 of the movable member 220 is located on the movement axis L2 of the strikers 143 and 143 of the vibrator 140 in the front-rear direction X. At this time, the displacement (also referred to as “stroke”) of the vibrator 140 in the first direction X <b> 1 is less than the displacement when the second engagement surface 145 of the vibrator 140 contacts the engagement arm 224 of the movable member 220. Therefore, none of the strikers 143 and 143 before and after the vibrator 140 enter the insertion space 227 of the movable member 220 or the first engagement portion 143a (first engagement) of the striker 143 as shown in FIG. The part having the surface 144 enters the insertion space 227 of the movable member 220. In this case, since the strikers 143 and 143 before and after the vibrator 140 do not interfere with the engaging arm 224 of the movable member 220, the protection device 200 does not operate and the movable member 220 is maintained at the initial position P1. When the movable member 220 is located at the initial position P1, the contact between the contact 216a and the contact 215a is maintained, so that the pair of electromagnetic coils 121a and 131a and the AC power supply are not interrupted. As a result, the reciprocating vibration of the vibrator 140 is continued, so that the above suction operation and discharge operation by the front and rear diaphragms 152 and 152 are normally performed.

(First displacement state)
As shown in FIG. 9, the vibrator 140 moves in the first direction X <b> 1 with a displacement that exceeds the displacement when the pump is normal in the first displacement state. At this time, since the vibrator 140 is not displaced in the second direction Y1, the state where the strikers 143 and 143 are located on the movement axis L2 of the insertion space 227 of the movable member 220 is maintained. Therefore, when the vibrator 140 moves in the first direction X1, as shown in FIG. 10, the first engaging portion 143a of one striker 143 enters the insertion space 227 of the movable member 220, and the striker 143 The second engaging portion 143b contacts the engaging arm 224 of the movable member 220 at the second engaging surface 145 and presses the engaging arm 224 in the first direction X1. The other striker 143 contacts the engagement arm 224 of the movable member 220 when displaced in the direction X2 opposite to the first direction X1. Then, as shown in FIG. 11, in the first displacement state where the displacement in the first direction X1 during the reciprocating vibration of the vibrator 140 is equal to or greater than the first reference value V1, the movable member 220 contacts the striker 143. The contact is pressed in the first direction X1, and moves in the first direction X1 from the initial position P1 to the power cutoff position P2 together with the vibrator 140. In the process in which the movable member 220 moves to the power cutoff position P2, as shown in FIG. 12, the contact point 216a of the terminal plate 216 rotates in the direction of arrow R to the position before being deformed according to its elastic force. Accordingly, at the power cutoff position P2 of the movable member 220, the contact between the contact 216a and the contact 215a is released, so that the pair of electromagnetic coils 121a and 131a and the AC power supply are shut off. As a result, when the reciprocating vibration of the vibrator 140 stops, the above-described suction operation and discharge operation by the front and rear diaphragms 152 and 152 are stopped.

(Second displacement state)
As shown in FIG. 13, the vibrator 140 is in a biased state in which the vibrator 140 is displaced by a displacement amount ΔY in one of the left and right directions Y1 in the second displacement state. At this time, the insertion space 227 of the movable member 220 is at a position deviating in the left-right direction Y from the movement axis L2 of the strikers 143, 143. Therefore, when the vibrator 140 is displaced in the second direction Y1 by the displacement amount ΔY and displaced in the first direction X1 with a displacement lower than that in the first displacement state, as shown in FIG. 14, one striker 143 The first engagement portion 143a contacts the second engagement projection 226 of the movable member 220 at the first engagement surface 144 and presses the second engagement projection 226 in the first direction X1. When the vibrator 140 is displaced in the direction opposite to the second direction Y1, the first engagement portion 143a of the striker 143 contacts the first engagement protrusion 225 of the movable member 220 and this first engagement. The mating protrusion 225 is pressed in the first direction X1. Then, as shown in FIG. 15, the vibrator 140 is displaced in the second direction Y1 by the displacement amount ΔY, and the displacement in the first direction X1 when the vibrator 140 is reciprocated is smaller than the first reference value V1. In the second displacement state, which is equal to or greater than 2 reference value V2, the movable member 220 is pressed in the first direction X1 by contact with the striker 143 and integrated with the vibrator 140 from the initial position P1 to the power cutoff position P2. And moves in the first direction X1. As a result, as in the case of the first displacement state shown in FIG. 12, the contact between the contact 216a and the contact 215a is released, and the pair of electromagnetic coils 121a and 131a and the AC power supply are cut off.

  As described above, the protection device 200 according to the present embodiment detects not only the abnormal displacement of the vibrator 140 in the first direction X1 but also the abnormal displacement of the vibrator in the second direction Y1 to thereby detect the vibrator 140. To stop automatically. Therefore, it is effective for reliably detecting and dealing with the abnormality of the vibrator 140 as compared with the case where only the abnormal displacement of the vibrator 140 in the first direction X1 is detected. In particular, the displacement of the vibrator in the first direction X1 until the striker 143 contacts the movable member 220 in the second displacement state is lower than the displacement in the first displacement state. In short, in the second displacement state, the protection device 200 operates even if the displacement in the first direction X1 is smaller than in the first displacement state. Thereby, when the vibrator 140 is displaced in the second direction Y1 in the second displacement state, the vibrator 140 can be prevented from contacting the electromagnetic coils 121a and 131a, or the vibrator 140 can be Even if it contacts the electromagnetic coils 121a and 131a, the contact time can be kept short. Further, the movable member 220 is configured to move integrally with the vibrator 140 in the same direction as the vibrator 140 when pressed by the striker 143 in both the first displacement state and the second displacement state. Has been. As a result, the resultant force of the magnetic force received by the vibrator 140 from the pair of electromagnetic coils and the inertial force of the vibrator 140 is efficiently transmitted to the movable member 220 as a driving force. As a result, the movable member 220 can be reliably moved to the power cutoff position P2, and the operability of the protection device 200 can be improved.

  Further, in this protective device 200, the striker 143 contacts the movable member 220 in the second displacement state by combining the vibrator 140 having the step structure and the movable member 220 having the gate structure. The displacement of the vibrator 140 in the first direction X1 is configured to be lower than the displacement in the first displacement state. This configuration can also be realized by a structure other than the protection device 200 of the present embodiment. For example, a structure similar to the step structure of the vibrator 140 can be provided on the movable member 220 side, and a structure similar to the gate structure of the movable member 220 can be provided on the vibrator 140 side.

Further , as a reference example, a striker 343 and a movable member 420 having the configuration shown in FIG. 16 can be employed. In this drawing, the same elements as those shown in FIG. 6 are denoted by the same reference numerals, and description of the elements is omitted. Unlike the striker 143 having the above-described step structure, the striker 343 is formed in a flat plate shape having a square side view in the left-right direction Y and a predetermined plate width D1 in the left-right direction Y. The engagement arm 224 of the movable member 420 includes a first engagement protrusion 425 and a second engagement protrusion 426. The first engagement protrusion 425 and the second engagement protrusion 426 extend in the front-rear direction X from the engagement arm 224 with the insertion space 427 having a space width D2 in the left-right direction Y and spaced apart from each other. . According to this configuration, when the vibrator 140 is displaced in the first direction X1 in the first displacement state, the striker 343 indicated by the solid line enters the insertion space 427 of the movable member 420 and Abutting on the engagement arm 224, the engagement arm 224 is pressed in the first direction X1. On the other hand, when the vibrator 140 is displaced in the second direction Y1 in the second displacement state and is displaced in the first direction X1 with a displacement lower than that in the first displacement state, the striker indicated by a two-dot chain line 343 contacts the second engagement protrusion 426 of the movable member 220 and presses the second engagement protrusion 426 in the first direction X1. Therefore , according to the reference example, even when the striker 343 and the movable member 420 are employed, the same operational effects as when the striker 143 and the movable member 220 are employed can be obtained.

  The present invention is not limited to the above-described exemplary embodiments, and various applications and modifications can be considered without departing from the object of the present invention. For example, each of the following embodiments to which the above embodiment is applied can be implemented.

  In the above embodiment, the striker 143 in which the first engagement portion 143a and the second engagement portion 143b are integrally formed has been described. However, in the present invention, the first engagement portion and the second engagement portion in the striker. It is also possible to adopt a structure in which the first engaging portion and the second engaging portion are separated from each other in the first direction.

  In the above embodiment, a case has been described in which a pair of strikers 143 and 143 are provided on the upper end surface of the main body 141 of the vibrator 140 and a pair of strikers 146 and 146 are provided on the lower end face of the main body 141 of the vibrator 140. However, in the present invention, the pair of strikers 146 and 146 may be omitted. Furthermore, any one of the pair of strikers 143 and 143 may be omitted. Further, as the shapes of the striker 143 and the striker 146, a flat plate shape having a uniform plate thickness is adopted, but in the present invention, various shapes other than the flat plate shape can be adopted as necessary.

  In the above-described embodiment, the magnetic pump 100 in which the diaphragm 152 is connected to each of both ends of the vibrator 140 has been described. However, the electromagnetic pump in which the diaphragm 152 is connected to only one end of the vibrator 140 is described. The present invention can also be applied.

  In the above-described embodiment, the extension arm 223, the engagement arm 224, and the two engagement protrusions 225, 226 of the movable member 220 are configured by flat plate-shaped portions having a uniform thickness in the front-rear direction X. However, in the present invention, the shape of each part of the movable member 220 can be changed as necessary.

  In the above embodiment, the electromagnetic pump 100 that performs the suction operation and the discharge operation of air, which is one of the fluids, has been described. However, the present invention is applied to an electromagnetic pump that handles gases and liquids other than air. You can also.

  DESCRIPTION OF SYMBOLS 100 ... Electromagnetic pump, 110 ... Pump mechanism, 120, 130 ... Electromagnet, 121a, 131a ... Electromagnetic coil, 140 ... Vibrator, 143, 146 ... Striker, 143a ... 1st engaging part, 143b ... 2nd engaging part DESCRIPTION OF SYMBOLS 144 ... 1st engagement surface, 145 ... 2nd engagement surface, 150 ... Diaphragm mechanism, 152 ... Diaphragm, 200 ... Protection device, 210 ... Holder, 214 ... Locking piece, 215, 216 ... Terminal board, 215a, 216a ... contact point, 220 ... movable member, 221 ... operation part, 222 ... arm part, 223 ... extension arm, 224 ... engagement arm, 225 ... first engagement protrusion, 226 ... first engagement protrusion, 227 ... insertion space, 228 ... first protrusion, 229 ... second protrusion

Claims (3)

A diaphragm that can be elastically deformed to perform a fluid suction operation and a fluid discharge operation;
A vibrator having a permanent magnet and connected to the diaphragm;
A pair of electromagnetic coils that are disposed on both sides of the vibrator, and the vibrator applies a magnetic force to the vibrator so as to reciprocally vibrate while elastically deforming the diaphragm;
A protection device for stopping power supply to the pair of electromagnetic coils when the vibrator is abnormal;
With
The protective device is
A striker provided on the vibrator;
A movable member disposed on the movement axis of the striker;
With
The movable member is pressed in the first direction by contact with the striker in a first displacement state in which the displacement in the first direction during reciprocating vibration of the vibrator is equal to or greater than a first reference value. The electromagnetic coil and the power source are cut off to move to the first direction together with the vibrator, and the vibrator is displaced in the second direction intersecting the first direction and the vibration. In a second displacement state in which the displacement in the first direction during reciprocal vibration of the child is equal to or greater than a second reference value that is smaller than the first reference value, it is pressed in the first direction by contact with the striker. wherein and been configured to move in the first direction the transducer and together with the power-off position,
The movable member includes an engagement arm extending in the second direction and both the first direction and the second direction from the engagement arm in a state of being spaced apart from each other with an insertion space in the second direction. Two engaging projections extending in the intersecting direction,
The striker has a first engagement portion configured to face the engagement arm and have a size in the second direction that is less than the insertion space, and to be more than the first engagement portion in the first direction. A second engagement portion spaced from the engagement arm,
In the first displacement state of the vibrator, the first engagement portion of the striker enters the insertion space of the movable member, and the second engagement portion of the striker is the engagement arm of the movable member. The first engaging portion of the striker when the vibrator moves in the first direction with a displacement lower than that in the first displacement state in the second displacement state of the vibrator. An electromagnetic pump in which abuts against one of the two engaging protrusions of the movable member . The electromagnetic pump according to claim 1 ,
In the striker, the first engaging portion and the second engaging portion are integrally formed, and one of the two engaging protrusions of the movable member is contacted with the first engaging portion. The electromagnetic pump which comprises the level | step difference structure by the 1st engagement surface which contact | connects, and the 2nd engagement surface which contact | abuts the said engagement arm of the said movable member among the said 2nd engagement parts. The electromagnetic pump according to claim 1 or 2 ,
The electromagnetic pump, wherein the engagement arm and the two engagement protrusions of the movable member are configured by flat plate-like portions having a uniform plate thickness in the first direction.

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