JP2005171892A - Gear pump and liquid injection device - Google Patents

Gear pump and liquid injection device Download PDF

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Publication number
JP2005171892A
JP2005171892A JP2003413450A JP2003413450A JP2005171892A JP 2005171892 A JP2005171892 A JP 2005171892A JP 2003413450 A JP2003413450 A JP 2003413450A JP 2003413450 A JP2003413450 A JP 2003413450A JP 2005171892 A JP2005171892 A JP 2005171892A
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Japan
Prior art keywords
housing
gear pump
shaft
gear
storage chamber
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Pending
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JP2003413450A
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Japanese (ja)
Inventor
Mitsutaka Iwasaki
充孝 岩崎
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Seiko Epson Corp
セイコーエプソン株式会社
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Priority to JP2003413450A priority Critical patent/JP2005171892A/en
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Abstract

PROBLEM TO BE SOLVED: To provide a gear pump capable of preventing generation of noise due to gear vibration and a liquid ejecting apparatus using the gear pump.
A gear pump 20 includes a drive gear 26 and a driven gear 27 in a storage chamber 23 provided in a housing 21, and sends ink from a suction chamber to a discharge chamber. The housing 21 is fitted with a covered cylindrical shaft seal body 33 into which the drive shaft 22 is inserted. The shaft seal body 33 is made of an elastomer, and the opening 45 of the lid 43 is in contact with the outer periphery of the drive shaft 22. When a negative pressure is generated in the storage chamber 23, the opening 45 formed in the lid 43 is bent toward the storage chamber 23 and is separated from the drive shaft 22. Thereby, a gap is formed between the opening 45 and the drive shaft 22, and air flows into the housing chamber 23 from the outside through this gap.
[Selection] Figure 5

Description

  The present invention relates to a gear pump and a liquid ejecting apparatus using the gear pump.

Conventionally, the gear pump is superior in that the structure is simpler than other pumps. As this gear pump, there is a gear pump 100 as shown in FIG. The gear pump 100 includes a drive gear 103 and a driven gear 104 in a storage chamber 102 formed in a housing 101 (see, for example, Patent Document 1). The driving gear 103 and the driven gear 104 are rotatably supported by rotating shafts 105 and 106, respectively. A rotating shaft 105 connected to the drive gear 103 is inserted into a shaft hole (not shown) formed in the housing 101 and is inserted into the shaft hole 107 of the drive gear 103, and a part of the shaft protrudes to the outside. Yes. The driven gear 104 is rotatably supported by a rotating shaft 106 that passes through a shaft hole 108 provided in the center of the driven gear 104 and a shaft hole (not shown) of the housing 101. When the drive gear 103 and the driven gear 104 rotate, the liquid in the suction chamber 110 provided in the storage chamber 102 is in a space formed by the tooth grooves of the drive gear 103 and the driven gear 104 and the side surface 111 of the storage chamber 102. It is confined and delivered to the discharge chamber 112 side. Accordingly, the liquid is successively sent to the discharge chamber 112 of the storage chamber 102 according to the rotation of the gears 103 and 104, so that the discharge chamber 112 has a higher pressure than the suction chamber 110.
JP-A-8-093657

  By the way, in this gear pump, when the liquid is sucked at a high speed, the liquid in the space formed by the tooth grooves of the drive gear 103 and the driven gear 104 and the side surface 111 of the storage chamber 102 may be in a negative pressure state. In this case, the liquid in the negative pressure state is sent out to the discharge chamber 112. As described above, when the liquid in the negative pressure state is transferred to the discharge chamber 112, when the tooth tips of the drive gear 103 and the driven gear 104 near the discharge chamber 112 are separated from the side surface 111, the space and the discharge chamber 112 are separated from each other. There is a problem in that the liquid suddenly flows due to the pressure difference and the driving gear 103 and the driven gear 104 vibrate to generate noise.

  An object of the present invention is to provide a gear pump that can prevent generation of noise due to gear vibration and a liquid ejecting apparatus using the gear pump.

  The gear pump of the present invention accommodates a driving gear and a driven gear in a housing chamber provided in a housing, and the driving gear and the driven gear are rotated along with the rotation of the driving gear that passes through the housing and is drivingly connected to the driving gear. In the gear pump for feeding liquid from the suction chamber to the discharge chamber by rotating, a communication port that communicates from the outside of the housing to the storage chamber is provided, and the communication port is provided only outside the housing when the storage chamber is in a negative pressure state. A one-way valve that allows air to flow into the storage chamber is provided.

  According to this, the gear pump includes a one-way valve that allows air to flow from the outside of the housing to the housing chamber only when the housing port is in a negative pressure state and the communication port that communicates from the outside of the housing to the housing chamber. Yes. Therefore, when a negative pressure is generated in the storage chamber, the rapid flow of the liquid based on the pressure difference can be reduced by flowing air into the storage chamber through the communication port and the one-way valve. For this reason, generation | occurrence | production of the vibration of a drive gear and a driven gear by the rapid flow of a liquid, and generation | occurrence | production of the noise by vibration can be prevented.

In this gear pump, the one-way valve opens only when the pressure in the storage chamber becomes a low pressure lower than a predetermined value, and allows air to flow into the storage chamber from the outside of the housing.
According to this, the one-way valve opens only when the pressure in the accommodation chamber is less than a predetermined value. Therefore, when the gear pump rotates at a low speed and the negative pressure in the accommodation chamber is small and noise is not easily generated, air does not flow from the outside of the housing, and the reduction in the performance of the gear pump can be prevented. . On the other hand, when the pressure in the storage chamber is equal to or higher than a predetermined value, such as when the gear pump rotates at a high speed, it is possible to allow the inflow of air from the outside of the housing and prevent the generation of noise due to gear vibration.

In this gear pump, the one-way valve is a shaft seal member disposed between the housing and the drive shaft passing through the housing.
According to this, the one-way valve is a shaft seal portion disposed between the housing and the drive shaft, and the shaft seal member is moved from the outside of the housing to the housing chamber only when the housing chamber is in a negative pressure state. Allow inflow of air. Therefore, when a negative pressure is generated in the storage chamber, the rapid flow of the liquid based on the pressure difference can be mitigated by flowing air into the storage chamber via the shaft seal member. For this reason, generation | occurrence | production of the vibration of a drive gear or a driven gear by the rapid flow of a liquid, and generation | occurrence | production of the noise by vibration can be prevented.

  In this gear pump, the shaft seal member has a covered cylindrical elastic seal body whose inner diameter is larger than the diameter of the drive shaft, and the cover portion of the elastic seal body is arranged to face the housing chamber side. At the same time, the lid is formed with an opening through which the drive shaft passes and is in sliding contact. The opening expands when the accommodation chamber side is under negative pressure in the cylinder of the elastic seal body. The air is allowed to flow into the storage chamber, and when the storage chamber side becomes positive pressure from the inside of the cylinder of the elastic seal body, the diameter is reduced and the air from the storage chamber to the inside of the cylinder of the elastic seal body The inflow was blocked.

  According to this, the shaft seal member has a covered cylindrical elastic seal body, and an opening portion through which the drive shaft passes and is in sliding contact is formed in the lid portion. The opening portion expands to allow the inflow of air when the storage chamber side becomes negative pressure, and reduces the diameter to block the inflow of air when the storage chamber side becomes positive pressure. Therefore, the shaft seal member can have a function of allowing the inflow of air only in the direction from the outside toward the storage chamber when the storage chamber has a negative pressure, and the structure can be simplified.

In this gear pump, the shaft seal member is disposed in a housing recess formed by expanding the housing chamber side of a bearing portion that rotatably supports the drive shaft formed in the housing.
According to this, the shaft seal member is disposed in the housing recess formed by expanding the housing chamber side of the bearing portion formed in the housing. For this reason, a shaft seal member can be accommodated compactly.

  In this gear pump, the distance between the drive shaft and the bearing portion that rotatably supports the drive shaft is such that air flow from the outside of the housing to the housing recess is allowed when air flows into the housing chamber. This is the interval that limits inflow.

  According to this, the interval between the drive shaft and the bearing portion is an interval that restricts the inflow of air when the air flows into the storage chamber. For this reason, since air does not flow excessively into the storage chamber, it is possible to prevent the pump discharge rate and the like from being reduced by excessive supply of air.

In this gear pump, a shaft pressing member having a bearing portion rotatably supporting the drive shaft protruding from the housing is fixed to one side of the housing, and the shaft seal member is a base end of the elastic seal body. The portion is fixed by being sandwiched between the housing and the shaft pressing member.

According to this, since the shaft seal portion is sandwiched between the housing and the shaft pressing member, the shaft seal portion can be firmly fixed.
In this gear pump, the shaft pressing member is formed with an introduction path for allowing air to flow into the cylinder of the elastic seal body from a position separated from the bearing portion.

  According to this, since the introduction path for allowing air to flow into the cylinder of the elastic seal body is formed in the shaft pressing member, air does not flow directly from the bearing portion. For this reason, air can be stably supplied into the cylinder of the elastic seal body.

In this gear pump, a suction resistor that restricts the inflow of air into the cylinder is disposed in the introduction path formed in the shaft pressing member.
According to this, the suction resistor for restricting the inflow of air is disposed in the introduction path of the shaft pressing member. For this reason, since air does not flow excessively into the storage chamber, it is possible to prevent the pump discharge rate and the like from being reduced by excessive supply of air.

In this gear pump, the suction resistor is attached to an inlet portion of the introduction path formed in the shaft pressing member.
According to this, the suction resistor is attached to the entrance portion of the introduction path. For this reason, air can be stably flowed into the introduction path.

The liquid ejecting apparatus of the present invention includes the gear pump described above.
According to this, since the above-described gear pump is provided in the liquid ejecting apparatus, it is possible to reduce the size and thickness, and to prevent vibration of the pump and noise due to vibration.

In this liquid ejecting apparatus, the gear pump is a suction pump that sucks waste liquid of a liquid ejecting head that ejects liquid.
According to this, since the gear pump is a suction pump that sucks the waste liquid of the liquid ejecting head, even when the waste liquid of the liquid ejecting head is sucked, vibration of the gear pump and noise due to vibration can be prevented.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the printer 1 includes a frame 2 having a substantially rectangular parallelepiped shape. A platen 3 is disposed on the frame 2, and a recording sheet (not shown) as a target is fed onto the platen 3 by a paper feed mechanism (not shown).

  A guide member 4 is installed on the frame 2 so as to be parallel to the longitudinal direction of the platen 3. A carriage 5 that is movable along the guide member 4 is inserted into and supported by the guide member 4. A carriage motor 6 is attached to the frame 2, and the carriage motor 6 drives the carriage 5 via a timing belt 7 hung on a pair of pulleys P1 and P2. With this configuration, when the carriage motor 6 is driven, the driving force is transmitted to the carriage 5 via the timing belt 7, and the carriage 5 is supported by the guide member 4 and parallel to the longitudinal direction of the platen 3. It is designed to reciprocate.

  On the other hand, a recording head 8 as a liquid ejecting head is provided on the lower surface of the carriage 5 (the surface facing the platen 3). Although not shown, the recording head 8 has a nozzle forming surface on the lower surface facing the platen 3.

  As shown in FIG. 1, the frame 2 includes a cartridge case 9. In the cartridge case 9, an ink cartridge 10 as a liquid storage unit is loaded. In this embodiment, six ink cartridges 10 are provided, and each ink cartridge 10 stores various inks. The ink stored in these ink cartridges 10 is supplied to the recording head 8 via each tube T by being pressurized by a pressure pump (not shown).

  The ink that has flowed into the recording head 8 is pressurized by a piezoelectric element (not shown) provided in the recording head 8 and is ejected from the nozzles of the recording head 8 toward the recording paper as ink droplets.

  As shown on the right side in FIG. 1, a cap holder 11 for sealing the nozzles of the recording head 8 when the printer 1 is in a non-printing state is provided in the non-printing area in the frame 2. . The cap holder 11 is provided with a box-shaped cap member 12 made of a flexible member, and is arranged so that the opening side thereof faces the nozzle forming surface of the recording head 8. The cap holder 11 is driven by a driving mechanism (not shown) to bring the cap member 12 into close contact with the nozzle forming surface in order to prevent the vicinity of the nozzle opening.

  The cap holder 11 is formed with a suction port (not shown) that allows the inside of the cap member 12 to communicate with the outside, and one end of a tube 13 is connected to the suction port. The other end of the tube 13 is connected to a pump unit 14 provided in the frame 2. Further, a waste ink tank 16 is connected to the pump unit 14 via a tube 15. Therefore, when the pump unit 14 is driven when the cap member 12 seals the nozzle forming surface, negative pressure is generated in the space formed by the cap member 12 and the nozzle forming surface. Yes. As a result, so-called cleaning is performed in which ink and bubbles having increased viscosity in the nozzles of the recording head 8 and ink and dust adhering to the nozzle forming surface are sucked out. Ink or the like sucked from the recording head 8 is sent to the waste ink tank 16 via the pump unit 14.

  The pump unit 14 includes a drive motor, a drive mechanism, and a gear pump 20 (see FIG. 2) (not shown). When the drive motor is driven, the gear pump 20 is driven via the drive mechanism.

(Gear pump 20)
Next, the gear pump 20 provided in the pump unit 14 will be described with reference to FIGS. FIG. 2 is a perspective view showing the entire gear pump 20, and FIG. 3 is an exploded perspective view of the gear pump 20. FIG. 4 is a plan view for explaining the inside of the gear pump 20, and FIGS. 5 and 6 are cross-sectional views of the gear pump 20.

  As shown in FIG. 2, the gear pump 20 includes a housing 21, and a drive shaft 22 protrudes rotatably from a bearing portion 21 b formed on the lower side surface 21 c of the housing 21. The drive shaft 22 is connected to the drive mechanism, and is rotated in the r1 direction by driving of the drive motor to rotate a drive gear 26 (see FIG. 3) in the housing 21.

As shown in FIGS. 3 and 4, the housing 21 is formed in a substantially rectangular parallelepiped shape, and the accommodation chamber 23 is recessed in the upper side surface 21 a. The storage chamber 23 includes a first storage part 24 and a second storage part 25. The first and second storage portions 24 and 25 are each formed in a substantially columnar shape, and overlap each other to form a storage chamber 23. Further, a suction part 23 a and a discharge part 23 b are recessed in the side surface of the storage chamber 23 (inner side surface of the housing 21) so as to be sandwiched between the first storage part 24 and the second storage part 25. .

  As shown in FIG. 5, the bearing portion 21 b is formed with a housing recess 21 e that constitutes a communication port that expands the housing 21 side (the housing chamber 23 side). And the shaft hole 28 which comprises a communicating port is penetrated and formed in the bottom face of the accommodation recessed part 21e. The shaft hole 28 has an inner diameter larger than the outer diameter of the drive shaft 22. For this reason, when the drive shaft 22 passes through the shaft hole 28, a gap C is provided between the shaft hole 28 and the drive shaft 22. In FIG. 5, the gap C is greatly illustrated in order to emphasize it, but in actuality, the size is about several tens of μm. A shaft support portion 29 is recessed on the bottom surface of the second housing portion 25.

  In addition, as shown in FIG. 3, screw fitting insertion holes 21 d are formed through the four corners of the housing 21. These screw fitting insertion holes 21d can be fitted with four screws P, respectively.

  Further, as shown in FIG. 5, a shaft seal member 31 is disposed in the housing recess 21 e of the bearing portion 21 b of the housing 21. As shown in FIG. 3, the shaft seal member 31 includes a shaft seal body 33 as an elastic seal body. The shaft seal body 33 is made of a flexible material such as an elastomer, and is formed in a covered cylindrical shape. The inner diameter of the cylinder 36 is larger than the outer diameter of the drive shaft 22. The shaft seal member 31 is disposed in the housing recess 21e so that the lid portion 43 of the shaft seal body 33 faces the first housing portion 24 side. The shaft seal body 33 has a thick portion 34 formed on the outer peripheral surface of the base end thereof, and the portion excluding the thick portion 34 is easily bent. When the shaft seal member 31 is disposed in the receiving recess 21e, the thick portion 34 is in pressure contact with the inner peripheral surface of the receiving recess 21e, so that the inner peripheral surface of the receiving recess 21e and the outer peripheral surface of the thick portion 34 are provided. Maintains airtightness between. Further, the shaft seal body 33 has an opening 45 formed through the lid portion 43 thereof. Then, the drive shaft 22 is inserted through the opening 45 of the lid 43 so as to be in sliding contact with the inner peripheral surface thereof. As shown in FIG. 7, both opening edges of the opening 45 are trimmed to ensure a contact surface pressure with the drive shaft 22 and to maintain airtightness.

  More specifically, as shown in FIG. 7A, when the lid portion 43 (opening 45) is not bent, the shaft seal member 31 includes the inner peripheral surface of the opening 45 and the outer peripheral surface of the drive shaft 22. Keeps the airtightness between. Further, as shown in FIG. 7B, when the lid portion 43 (opening portion 45) is bent toward the first accommodating portion 24, the opening portion 45 is in an expanded state, and the opening portion 45. Between the inner peripheral surface and the outer peripheral surface of the drive shaft 22 is not airtight. On the other hand, as shown in FIG. 7C, when the lid portion 43 (opening 45) bends toward the inside 36 of the shaft seal body 33, the shaft seal body 33 is wound around the inside 36 and bent. Therefore, the opening 45 is in a reduced diameter state, and the airtightness between the inner peripheral surface of the opening 45 and the outer peripheral surface of the drive shaft 22 becomes stronger.

As shown in FIG. 7B, when the lid portion 43 (opening 45) bends toward the first housing portion 24, the first housing portion 24 side of the shaft seal body 33 is connected to the shaft seal body 33. There is a case where the pressure is lower than the in-cylinder 36 side and less than a predetermined value (negative pressure state). In this case, the air in the cylinder 36 of the shaft seal body 33 flows between the inner peripheral surface of the opening 45 and the outer peripheral surface of the drive shaft 22 and flows into the first accommodating portion 24 side. . Further, the pressure on the first housing portion 24 side of the shaft seal main body 33 is lower than that in the cylinder 36 side of the shaft seal main body 33, but when the pressure is equal to or higher than the predetermined value, the lid portion 43. Is not bent. The predetermined value is a pressure value on the storage chamber 23 side. When the pressure on the storage chamber 23 side is lower than the predetermined value, the drive gear 26 and the driven gear 27 are vibrated by the negative pressure, and noise is generated. To do.

  Moreover, as shown in FIG.7 (c), when the cover part 43 (opening part 45) bends inside the cylinder of the shaft seal main body 33, the 1st accommodating part 24 side of the shaft seal main body 33 will be in a positive pressure state. In some cases, the pressure is higher than that in the cylinder 36 of the shaft seal body 33. Therefore, in this case, the fluid on the first housing portion 24 side of the shaft seal body 33 does not flow into the cylinder 36 of the shaft seal body 33.

  Next, the drive gear 26 and the driven gear 27 will be described. As shown in FIGS. 3 and 4, the drive gear 26 is formed with a shaft hole 35 penetrating substantially at the center thereof. The shaft hole 35 is formed so that its inner diameter is slightly larger than the outer diameter of the tip 22 a of the drive shaft 22. As shown in FIG. 4, the driven gear 27 has a shaft hole 38 formed substantially at the center thereof. A cylindrical driven shaft 30 is rotatably inserted into the shaft hole 38.

  As shown in FIG. 4, the drive gear 26 and the driven gear 27 are housed in the first housing portion 24 and the second housing portion 25 in a state of being engaged with each other. A suction chamber 39 and a discharge chamber 40 defined by the drive gear 26 and the driven gear 27 are formed in the storage chamber 23. A space surrounded by the drive gear 26, the driven gear 27, and the suction portion 23a is a suction chamber 39, and ink that flows from the outside of the gear pump 20 is temporarily stored. A space surrounded by the drive gear 26 and the driven gear 27 and the discharge portion 23 b is a discharge chamber 40, and the ink sent from the suction chamber 39 by the rotation of the drive gear 26 and the driven gear 27 is temporarily stored. .

  The accommodation chamber 23 is sealed by a cover 32 shown in FIG. The cover 32 includes a suction port 41 and a discharge port 42 protruding to the side surface 32 a thereof. The suction port 41 and the discharge port 42 are formed in the suction chamber 39 when the cover 32 seals the housing 21. And the position corresponding to the position of the discharge chamber 40. The tube 13 communicated with the cap member 12 is connected to the suction port 41, and the ink discharged from the cap member 12 flows into the suction chamber 39 in the gear pump 20 through the suction port 41. The discharge port 42 is connected to the tube 15 communicating with the waste ink tank 16, and the ink in the discharge chamber 40 is sent out to the waste ink tank 16 through the discharge port 42.

  As shown in FIG. 5, a press-fit groove 32 c is formed on the other side surface 32 b of the cover 32. An annular packing 48 is press-fitted into the press-fit groove 32c. The packing 48 is made of a flexible member such as an elastomer, and closes the housing chamber 21 when the cover 32 is attached to the housing 21 to seal the housing chamber 23.

  Further, as shown in FIG. 5, a shaft support portion 44 is formed through the other side surface 32 b of the cover 32. The shaft support portion 44 supports the driven shaft 30 in a rotatable manner. Furthermore, fitting insertion holes H <b> 1 (see FIG. 3) are formed at the four corners of the cover 32. Four screws P inserted into the housing 21 are inserted into the insertion hole H1.

As shown in FIGS. 5 and 6, each screw P is inserted into the insertion hole H1 of the cover 32 and the screw insertion hole 21d of the housing 21, and fastening means (not shown) such as a nut is attached to these screws P. When attached, the housing 21 housing the drive gear 26 and the driven gear 27 and the cover 32 are fixed to each other. At this time, the drive shaft 22 inserted and inserted into the drive gear 26 is connected to the drive gear 26 so that it cannot be pulled out by attaching a drop prevention ring R to the groove 22b of the tip 22a. Further, the drive shaft 22 passes through the opening 45 of the shaft seal member 31 and the in-cylinder 36 and protrudes from the shaft hole 28 of the housing 21 to the outside. At this time, since a gap C is provided between the shaft hole 28 of the housing 21 and the drive shaft 22, the cylinder 36 of the shaft seal member 31 is always open to the atmosphere through the gap C. Yes.

  In addition, the driving gear 26 and the driven gear 27 have their tooth tips in contact with the side surface S1 of the first housing portion 24 and the side surface S2 of the second housing portion 25, respectively, or with a minute gap. It is accommodated in the housing 21. Further, the drive shaft 22 of the drive gear 26 is inserted into the shaft hole 35 with some play. Further, the driven shaft 30 penetrating the driven gear 27 is fitted and inserted between the shaft support portion 29 of the housing 21 and the shaft support portion 44 of the cover 32 with some play.

  Next, the operation of the gear pump 20 will be described by taking as an example the case where the recording head 8 is cleaned. During head cleaning, the cap holder 11 is driven to seal the nozzle forming surface of the recording head 8 with the cap member 12. When a drive command is sent at a predetermined timing from a control unit (not shown) of the printer 1, the drive motor is driven and the drive shaft 22 rotates in the r1 direction. When the drive shaft 22 rotates in the r1 direction, the drive gear 26 rotates in the r1 direction. The driven gear 27 rotates in the r2 direction by meshing with the drive gear 26.

  When the drive gear 26 and the driven gear 27 are rotated, the ink stored in the suction chamber 39 is confined in a space formed by the tooth grooves and the side surfaces S1 and S2 of the storage chamber 23, and sequentially toward the discharge chamber 40 side. Sent out. Therefore, the suction chamber 39 is in a low pressure state, and ink and air in the cap member 12 flow into the suction chamber 39 through the tube 13 due to a pressure difference from the cap member 12. Then, since the ink that has flowed in is sequentially sent out by the drive gear 26 and the driven gear 27, the suction chamber 39 is always at a lower pressure than the discharge chamber 40.

  Since the drive gear 26 and the driven gear 27 take in the ink in the suction chamber 39, the ink having a relatively small pressure in the suction chamber 39 is confined in the tooth grooves. For this reason, the pressure (atmospheric pressure) in the cylinder 36 of the shaft seal member 31 is larger than the pressure in the suction chamber 39 and the tooth gap, that is, the pressure on the first housing portion 24 side of the shaft seal member 31. . That is, the first accommodating portion 24 side of the shaft seal member 31 is in a negative pressure state.

  Furthermore, when the pressure on the first housing portion 24 side becomes less than the predetermined value due to high-speed rotation of the drive gear 26 and the driven gear 27, relatively large noise is likely to be generated due to vibration of the drive gear 26 and the driven gear 27. It becomes a state. At this time, the lid 43 of the shaft seal member 31 bends toward the drive gear 26 (accommodating chamber 23) due to the pressure difference. As a result, the opening 45 of the shaft seal member 31 expands away from the side surface of the drive shaft 22, and air flows toward the drive gear 26 through the generated gap. On the other hand, when the first accommodating portion 24 side has a negative pressure, when the pressure is equal to or higher than a predetermined value, the drive gear 26 and the driven gear 27 do not vibrate or the drive gear 26 and the driven gear 27 Even if it vibrates slightly, no loud noise is generated. In this case, the lid 43 does not bend toward the drive gear 26 side (accommodating chamber 23 side).

  The inflowing air flows through the clearance between the shaft hole 35 of the drive gear 26 and the drive shaft 22, the clearance between the drive gear 26 and the housing 21, etc., and the suction chamber 39, the drive gear 26 and the driven gear 27. It flows into the space in the tooth gap. At this time, the air flowing into the cylinder 36 of the shaft seal member 31 flows from the outside through the gap C between the shaft hole 28 of the bearing portion 21b and the drive shaft 22, but the size of the gap C is large. The amount of inflow is limited by the cross-sectional area. As a result, it is possible to prevent the air from flowing excessively into the storage chamber 23 and the ink discharge amount from being lowered.

When the air flows into the suction chamber 39 or the space in the tooth gap by a predetermined range amount, the drive gear 26 and the driven gear 27 are prevented from vibrating. This factor is considered to be the following phenomenon. The air mixed in the ink in the suction chamber 39 or each tooth space expands because the space in the space is in a negative pressure state. For this reason, even when the mixed air is sent to the discharge chamber 40 side by the drive gear 26 and the driven gear 27, the air expands in the space formed by the tooth grooves and the side surfaces S1 and S2, thereby eliminating the negative pressure state. Will be in the direction. At the moment when the ink in each tooth gap is discharged to the discharge chamber 40 side, the space formed by the tooth groove and the side surface S1 is connected to the discharge chamber 40 having a relatively high pressure. At this time, as the space is gradually opened to the discharge chamber 40 side, the expanded bubbles are gradually contracted by the pressure of the discharge chamber 40. As a result, the bubbles buffer the pressure difference between the space and the discharge chamber 40. This is considered to prevent the rapid flow of ink due to the pressure difference. For this reason, when the tooth tips of the drive gear 26 and the driven gear 27 are separated from the side surfaces S1 and S2, it is possible to prevent the drive gear 26 from vibrating due to a pressure difference between the space and the discharge chamber 40.

According to the first embodiment, the following effects can be obtained.
(1) In the present embodiment, the shaft seal member 31 that flows air into the housing chamber 23 of the housing 21 is provided in the housing recess 21e formed in the bearing portion 21b. The shaft seal member 31 is formed so that the portion excluding the thick portion 34 of the covered cylindrical shaft seal main body 33 is bent, and an opening 45 is formed in the cover portion 43 of the shaft seal main body 33 so that the drive shaft 22 is formed. It was designed to support through so as to be slidable.

  And when a negative pressure arises in the storage chamber 23, the opening part 45 expands toward the storage chamber 23 side, and as shown in FIG.7 (b), the inner peripheral surface of the opening part 45 and A space between the outer peripheral surface of the drive shaft 22 and the outer peripheral surface of the drive shaft 22 is not airtight.

  Therefore, the air in the cylinder 36 of the shaft seal body 33 flows between the inner peripheral surface of the opening 45 and the outer peripheral surface of the drive shaft 22 and flows into the first housing portion 24 side. As a result, air is mixed into the ink accommodated in the space formed by the tooth grooves of the drive gear 26 and the driven gear 27 and the side surfaces S1 and S2, and the pressure difference between the ink in the space and the ink in the discharge chamber 40 is alleviated. Is done. For this reason, the rapid flow of ink caused by the pressure difference can be eliminated, and vibration of the drive gear 26 and the driven gear 27 due to the flow of ink can be prevented.

  (2) In the present embodiment, when the housing 23 side (first housing portion 24 side) of the shaft seal body 33 is at a pressure lower than the in-cylinder 36 side of the shaft seal body 33 and a pressure less than a predetermined value. Only in the negative pressure state, the air in the cylinder 36 of the shaft seal body 33 flows between the inner peripheral surface of the opening 45 and the outer peripheral surface of the drive shaft 22 and flows into the first housing portion 24 side. I did it. For this reason, air can flow in only when the pressure in the storage chamber 23 is lower than a predetermined value and noise is likely to occur due to vibrations of the drive gear 26 and the driven gear 27. In addition, even when negative pressure is generated in the storage chamber 23, when it is difficult for noise to be generated due to vibrations of the drive gear 26 and the driven gear 27, that is, when the storage chamber 23 is at a pressure higher than a predetermined value, the lid 43 is It is possible to prevent air from flowing into the storage chamber 23 without bending. For this reason, it is possible to prevent a decrease in the ink discharge amount of the gear pump 20 and to maintain the pump capacity.

  (3) In the present embodiment, the inner diameter of the shaft hole 28 provided in the housing 21 and penetrating the drive shaft 22 is set to such an extent that external air is restricted and can flow into the cylinder 36 of the shaft seal member 31. It was formed so as to be larger than the outer diameter of the drive shaft 22. Therefore, the cylinder interior 36 of the shaft seal member 31 is not directly opened to the atmosphere, and the amount of air flowing into the cylinder 36 is between the inner circumferential surface of the shaft hole 28 and the outer circumferential surface of the drive shaft 22. It is limited by the gap C generated in For this reason, it is possible to prevent the air from flowing excessively into the storage chamber 23 to reduce the ink discharge amount or the like of the gear pump 20.

(4) In the present embodiment, the cylinder interior 36 into which the drive shaft 22 is fitted and inserted is formed in the shaft seal body 33 of the shaft seal member 31, and the opening 45 is formed in the lid portion 43. For this reason, when negative pressure is generated in the storage chamber 23, air can be introduced from the cylinder 36 side, so that the air can be easily distributed around the drive gear 26.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Since the second embodiment has a configuration in which only a part of the gear pump of the first embodiment is changed, detailed description of the same parts is omitted.

  As shown in FIG. 8, the gear pump 50 includes a housing 21 having a substantially rectangular parallelepiped shape. A through hole 51 a is formed in the bottom surface of the first housing portion 24 of the housing 21. The inner diameter of the through hole 51a is formed such that the drive shaft 22 penetrates with a sufficient margin. A shaft hole 51 b is formed through the bottom surface of the second housing portion 25. The shaft hole 51b penetrates the driven shaft 30 and rotatably supports the driven shaft 30.

  The shaft seal body 53 of the shaft seal member 52 is disposed in the through hole 51a. As shown in FIG. 8, the shaft seal member 52 includes a covered cylindrical shaft seal body 53 as an elastic seal body, a disc-shaped restriction piece 54, and a connecting piece 52 a, and the shaft seal body 53 and the restriction piece 54. Are connected by a connecting piece 52a. The shaft seal member 52 is made of a flexible material such as an elastomer.

  The inner diameter of the inside 55 of the shaft seal member 52 is larger than that of the drive shaft 22. And the cover part 57 of the shaft seal main body 53 is arrange | positioned in the through-hole 51a so that it may face the said 1st accommodating part 24 side. The shaft seal body 53 has a thick portion 53a formed on the lower outer peripheral surface thereof, and the portion excluding the thick portion 53a is easily bent. When the shaft seal body 53 is disposed in the through hole 51a, the thick portion 53a is pressed against the inner peripheral surface of the through hole 51a, and the inner peripheral surface of the through hole 51a and the outer peripheral surface of the thick portion 53a. Maintains airtightness between. The shaft seal body 53 has an opening 56 formed through the lid 57. The drive shaft 22 is inserted into the opening 56 of the lid portion 57 so as to be in sliding contact with the inner peripheral surface thereof. Both opening edges of the opening 56 are trimmed to increase the contact surface pressure with respect to the drive shaft 22 and ensure airtightness.

  The disc-shaped restricting piece 54 is disposed so as to come into contact with the shaft hole 51 b including the driven shaft 30 penetrating the shaft hole 51 b from the lower side surface 21 c of the housing 21. The restricting piece 54 is formed with an annular seal protrusion 54 a so that air does not flow between the shaft hole 51 b and the driven shaft 30 and flow into the second housing portion 25. The connecting piece 52 a that connects the shaft seal body 53 and the regulating piece 54 is formed in a plate shape and is disposed so as to contact the lower side surface 21 c of the housing 21. Further, the connecting piece 52a surrounds the shaft seal body 53 so that air does not flow into the second accommodating portion 25 through the space between the outer peripheral surface of the thick portion 53a and the inner peripheral surface of the through hole 51a. An annular seal protrusion 52b is formed.

  A lower cover 60 as a shaft pressing portion shown in FIG. 9 is attached to the lower surface 21c of the housing 21 in a state where the shaft seal member 52 is disposed. As shown in FIG. 9, the lower cover 60 includes a recess 61 on the upper surface 60 a side, and the restriction piece 54 of the shaft seal member 52 is accommodated in the recess 61. Further, the lower cover 60 is formed with a cylindrical bearing portion 62 at a position corresponding to the drive shaft 22 of the drive gear 26 accommodated in the housing 21, and the drive shaft is inserted into the shaft hole 62 a of the bearing portion 62. 22 is rotatably supported.

Further, holes H <b> 2 for inserting the screws P are formed through the four corners of the lower cover 60. The cover 32, the housing 21 and the lower cover 60 are fixed to each other by attaching the screw H through the hole H2, the screw fitting insertion hole 21d, and the fitting insertion hole H1 of the cover 32 and attaching fastening means (not shown). The At this time, the connecting piece 52a of the shaft seal member 52 interposed between the lower side surface 21c of the housing 21 and the upper surface 60a of the lower cover 60 is held in a pressed state.

  As shown in FIG. 9, a substantially cylindrical introduction port 63 that constitutes a communication port is formed on the lower surface 60 c of the lower cover 60 so as to protrude from a position away from the bearing portion 62. In the lower cover 60, an air flow path that constitutes an introduction path and a communication port that communicates from the introduction port 63 to the cylinder 55 of the shaft seal body 53 that is pressed and held by the housing 21 and the lower cover 60. 64 is formed around the bearing portion 62. Accordingly, the external air is guided from the inlet 63 to the inside 55 of the shaft seal body 53 via the air flow path 64.

  The introduction port 63 is fitted with a cylindrical support portion 66 that constitutes a communication port. As shown in FIG. 8, the cylindrical support portion 66 includes a main body 67 and an attachment port 68 protruding from the main body 67. The main body 67 is formed in a cylindrical shape, and the inside thereof is an air inlet 67a. The attachment port 68 is connected to the introduction port 63 of the lower cover 60. Further, as shown in FIG. 9, a suction resistor 69 is disposed in the main body 67. The suction resistor 69 is made of a porous metal material, and functions as a resistor that limits the air inflow amount by being disposed between the inlet 63 and the atmosphere.

  Further, as shown in FIG. 9, the bearing portion 62 of the lower cover 60 protrudes toward the lower surface 60 c, and an outer seal 70 is fitted to the bearing portion 62. The outer seal 70 is formed in substantially the same shape as the covered cylindrical shaft seal body 53 of the shaft seal member 52, and supports the drive shaft 22 so as to be rotatable from the outside. The bearing portion 62 is provided with a slight gap in order to rotatably support the drive shaft 22, but air does not flow into the accommodation chamber 23 from this gap and is mainly introduced into the accommodation chamber 23. Air flows in through the opening 63 and the air flow path 64. For this reason, the outer seal 70 is airtightly held so that air does not flow from the bearing portion 62 to the housing chamber 23 side.

  In the gear pump 50 having such a configuration, when the drive gear 26 and the driven gear 27 are rotated, a negative pressure is generated in the storage chamber 23. Further, when the pressure on the storage chamber 23 side is lower than a predetermined value, the shaft seal body 53 is provided. The lid portion 57 bends toward the storage chamber 23 side. As a result, a gap is generated between the inner peripheral surface of the opening 56 and the outer peripheral surface of the drive shaft 22. As a result, the air flowing from the outside flows into the accommodation chamber 23 through the clearance between the suction resistor 69, the air flow path 64, and the inner peripheral surface of the opening 56 and the outer peripheral surface of the drive shaft 22. Even if a negative pressure is generated in the storage chamber 23, the lid portion 43 does not bend toward the storage chamber 23 when the pressure is higher than the pressure.

  The air that has flowed into the storage chamber 23 is taken into the space formed by the suction chamber 39, the drive gear 26 and the driven gear 27, and the side surfaces of the storage chamber 23, which are relatively low pressure, in the form of bubbles. . Then, the ink expands in the space formed by the tooth gap and the storage chamber 23 and contracts when discharged into the discharge chamber 40 to relieve the rapid ink flow generated in the vicinity of the discharge chamber 40.

According to the second embodiment, the following effects can be obtained in addition to the effects described in (1), (2), and (3) of the first embodiment.
(5) In the present embodiment, the air flow path 64 that connects the outside and the cylinder interior 55 of the shaft seal body 53 is formed in the lower cover 60 that seals the housing chamber 23 of the housing 21. Further, when a negative pressure is generated in the storage chamber 23, the opening 56 of the lid 57 of the shaft seal body 53 is expanded, and the space between the inner peripheral surface of the opening 56 and the drive shaft 22 is set. To be in a non-airtight state. The air in the cylinder 55 of the shaft seal main body 53 passes between the inner peripheral surface of the opening 56 and the outer peripheral surface of the drive shaft 22 so that the air flows into the storage chamber 23.

  Further, a cylindrical support portion 66 provided with a suction resistor 69 was attached to an end portion (attachment port 68) of the air flow path 64. The amount of air flowing into the cylinder 55 of the shaft seal body 53 is limited by the suction resistor 69. For this reason, since air does not flow excessively into the storage chamber 23, a decrease in the ink discharge amount of the gear pump 20 can be prevented.

In addition, you may change each said embodiment as follows.
In the above embodiments, the method of injecting air into the cylinders 36 and 55 of the shaft seal bodies 33 and 53, for example, other methods such as making a hole in the drive shaft 22 and injecting air into the cylinders 36 and 55, etc. May be implemented.

  In each of the above embodiments, air is caused to flow into the storage chamber 23 via the shaft seal bodies 33 and 53 disposed around the drive shaft 22. In addition, a communication port that is formed through the housing 21 and communicates with the outside and the inside of the storage chamber 23 may be provided, and a one-way valve may be attached to the communication port. In this case, when the storage chamber 23 and the communication port have a pressure lower than a predetermined value, the one-way valve communicates with the outside through the storage chamber 23 by the negative pressure. When the storage chamber 23 and the communication port have a pressure equal to or higher than a predetermined value, the one-way valve seals the storage chamber 23 side.

  In each of the above embodiments, air is allowed to flow into the storage chamber 23 from the drive shaft 22 side penetrating the drive gear 26, but air may be allowed to flow from the driven shaft 30 side of the driven gear 27. In this case, the shaft seal members 31 and 52 are attached to the driven shaft 30 side.

  In the second embodiment, the suction resistor 69 provided between the inlet 63 and the atmosphere is the suction resistor 69 made of a porous metal material, but may be a porous body made of a material other than metal. .

  In each of the above embodiments, the gear pump 20 is mounted on the so-called off-carriage type printer 1 in which the ink cartridge 10 is not mounted on the carriage 5. In addition, the gear pump 20 may be mounted on a printer of a type in which an ink cartridge is mounted on a carriage. Moreover, you may use the gear pump 20 as a pump mounted in apparatuses other than a liquid ejecting apparatus.

  In each of the above embodiments, the printer 1 that ejects ink has been described as the liquid ejecting apparatus, but other liquid ejecting apparatuses may be used. For example, printing apparatuses including fax machines, copiers, etc., liquid ejecting apparatuses that eject liquids such as electrode materials and coloring materials used in the production of liquid crystal displays, EL displays, and surface-emitting displays, and bio-organic materials used in biochip manufacturing It may be a liquid ejecting apparatus for ejecting a liquid or a sample ejecting apparatus as a precision pipette. The fluid (liquid) is not limited to ink, and may be applied to other fluids (liquids).

FIG. 2 is a plan view illustrating a printer according to the invention. The perspective view of the gear pump of 1st Embodiment. The exploded perspective view of the gear pump. The top view explaining the inside of the gear pump. Sectional drawing of the gear pump. Sectional drawing of the gear pump. It is explanatory drawing explaining operation | movement of a shaft seal main body, Comprising: (a) is a figure which shows the state which a cover part does not bend, (b) is a figure which shows the state in which a cover part bends to the 1st accommodating part side, (C) is a figure which shows the state which a cover part bends to the cylinder inner side of a shaft seal main body. The disassembled perspective view of the gear pump of 2nd Embodiment. Sectional drawing of the gear pump. Sectional drawing of the gear pump. Conventional gear pump.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Printer as a liquid ejecting apparatus, 8 ... Recording head as a liquid ejecting head, 20, 50 ... Gear pump, 21 ... Housing, 23 ... Housing chamber, 26 ... Drive gear, 27 ... Drive gear, 28 ... Shaft hole, 31 , 52 ... Shaft seal member, 33, 53 ... Shaft seal body as an elastic seal body, 43, 57 ... Lid, 45, 56 ... Opening, 52 ... Inner seal constituting air inflow valve, 54 ... Air inflow valve , A lower cover as a shaft pressing member, 64 an air flow path as an introduction passage, 62 a bearing portion, 63 an air inflow port, and 69 a suction resistor.

Claims (12)

  1. A driving gear and a driven gear are housed in a housing chamber provided in the housing, and the driving gear and the driven gear are rotated in accordance with the rotation of a driving shaft that passes through the housing and is drivingly connected to the driving gear. In the gear pump that sends liquid from the discharge chamber to the discharge chamber,
    A communication port that communicates from the outside of the housing to the storage chamber is provided, and the communication port has a one-way valve that allows inflow of air from the outside of the housing to the storage chamber only when the storage chamber is in a negative pressure state. A gear pump characterized by being arranged.
  2. The gear pump according to claim 1, wherein
    The gear pump according to claim 1, wherein the one-way valve opens only when the pressure on the storage chamber side becomes a low pressure lower than a predetermined value, and allows air to flow into the storage chamber from the outside of the housing.
  3. The gear pump according to claim 1 or 2,
    The gear pump according to claim 1, wherein the one-way valve is a shaft seal member disposed between the housing and the drive shaft passing through the housing.
  4. The gear pump according to claim 3,
    The shaft seal member has a covered cylindrical elastic seal body whose inner diameter is larger than the diameter of the drive shaft, and the lid portion of the elastic seal body is disposed so as to face the housing chamber side, and the lid The part is formed with an opening through which the drive shaft passes and slides,
    The opening expands to allow air to flow into the storage chamber when the storage chamber side is under negative pressure in the cylinder of the elastic seal body, and the storage chamber side is a cylinder of the elastic seal body. A gear pump characterized in that when the pressure becomes positive from the inside, the diameter is reduced to block the inflow of air from the housing chamber to the inside of the cylinder of the elastic seal body.
  5. The gear pump according to claim 3 or 4,
    The gear pump according to claim 1, wherein the shaft seal member is disposed in a housing recess formed by expanding the housing chamber side of a bearing portion that rotatably supports the drive shaft formed in the housing.
  6. The gear pump according to claim 5,
    The distance between the drive shaft and the bearing portion that rotatably supports the drive shaft restricts the inflow of air from the outside of the housing into the housing recess when allowing air to flow into the housing chamber. A gear pump characterized by being spaced.
  7. The gear pump according to claim 4,
    A shaft holding member having a bearing portion rotatably supporting the drive shaft protruding from the housing is fixed to one side of the housing,
    The shaft seal member is fixed by a base end portion of the elastic seal body being sandwiched between the housing and the shaft pressing member.
  8. The gear pump according to claim 7,
    2. A gear pump according to claim 1, wherein the shaft pressing member is formed with an introduction path for allowing air to flow into the cylinder of the elastic seal body from a position separated from the bearing portion.
  9. The gear pump according to claim 8,
    A gear pump characterized in that a suction resistor for restricting the inflow of air to the inside of the cylinder is disposed in the introduction path formed in the shaft pressing member.
  10. The gear pump according to claim 9,
    A gear pump, wherein the suction resistor is attached to an inlet portion of the introduction path formed in the shaft pressing member.
  11. A liquid ejecting apparatus comprising the gear pump according to claim 1.
  12. The liquid ejecting apparatus according to claim 11,
    The liquid ejecting apparatus according to claim 1, wherein the gear pump is a suction pump that sucks waste liquid of a liquid ejecting head that ejects liquid.
JP2003413450A 2003-12-11 2003-12-11 Gear pump and liquid injection device Pending JP2005171892A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003413450A JP2005171892A (en) 2003-12-11 2003-12-11 Gear pump and liquid injection device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003413450A JP2005171892A (en) 2003-12-11 2003-12-11 Gear pump and liquid injection device

Publications (1)

Publication Number Publication Date
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Family Applications (1)

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JP2003413450A Pending JP2005171892A (en) 2003-12-11 2003-12-11 Gear pump and liquid injection device

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101166536B1 (en) 2010-04-22 2012-07-19 (주)엘플러스 Micro-bubble generation pump
JP2014512890A (en) * 2011-02-16 2014-05-29 セクアナ メディカル エージー Apparatus and method for treating fluid retention
JPWO2015071927A1 (en) * 2013-11-12 2017-03-09 森合精機株式会社 Cleaning device
KR101726866B1 (en) * 2016-01-26 2017-04-27 현담산업 주식회사 Pump module
US9675327B2 (en) 2011-02-16 2017-06-13 Sequana Medical Ag Apparatus and methods for noninvasive monitoring of cancerous cells
US10398824B2 (en) 2004-08-18 2019-09-03 Sequana Medical Nv Dialysis implant and methods of use
US10569003B2 (en) 2012-02-15 2020-02-25 Sequana Medical Nv Systems and methods for fluid management

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10398824B2 (en) 2004-08-18 2019-09-03 Sequana Medical Nv Dialysis implant and methods of use
KR101166536B1 (en) 2010-04-22 2012-07-19 (주)엘플러스 Micro-bubble generation pump
JP2014512890A (en) * 2011-02-16 2014-05-29 セクアナ メディカル エージー Apparatus and method for treating fluid retention
US9675327B2 (en) 2011-02-16 2017-06-13 Sequana Medical Ag Apparatus and methods for noninvasive monitoring of cancerous cells
US10252037B2 (en) 2011-02-16 2019-04-09 Sequana Medical Ag Apparatus and methods for treating intracorporeal fluid accumulation
US10569003B2 (en) 2012-02-15 2020-02-25 Sequana Medical Nv Systems and methods for fluid management
JPWO2015071927A1 (en) * 2013-11-12 2017-03-09 森合精機株式会社 Cleaning device
KR101726866B1 (en) * 2016-01-26 2017-04-27 현담산업 주식회사 Pump module

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