JP2005344585A - Uniaxial eccentric screw pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily and securely cleanse a nozzle and needle constituting an end stud. <P>SOLUTION: In the state that the needle 22 is fitted into a tip outer side of the nozzle 21, the needle 22 and the nozzle 21 are held from both right and left sides by both members 23A, 23B of a cylindrical joint sleeve 23. By sliding a safety sleeve 24 slidably provided at a tip part of the nozzle 21 to the outer peripheral side of the joint sleeve 23 and covering the safety sleeve 24 on the outer periphery of the joint sleeve 23, the nozzle 21 and the needle 22 are fastened. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to low viscosity liquids such as foods, chemicals and chemical liquids, solid-containing liquids, slurries, and high viscosity liquids that require cleaning and storage in refrigerators, sterilization rooms, temperature-controlled rooms, etc. The present invention relates to a uniaxial eccentric screw pump that transfers, coats and fills various target liquids. More specifically, the present invention relates to a fastening structure of an end stud provided at the tip of a uniaxial eccentric screw pump that requires cleaning.

  As is well known, a single-shaft eccentric screw pump transfers a target liquid by rotating a male screw rotor that is driven to rotate into a female screw stator so as to rotate eccentrically, and passes the target liquid through an end stud at the tip of the pump. The liquid is applied and filled (see, for example, Patent Documents 1 and 2).

  Such single-shaft eccentric screw pumps are usually used for applications that do not require much disassembly, cleaning, and assembly. However, when used in food, medicine, and other fields, the wetted parts are required before and after work. In addition, it is necessary to clean the pump tip (end stud) to which the liquid adheres.

Then, for example, as shown in FIG. 6, the rotationally driven male screw type rotor 101 is rotatably inserted into the female screw type stator 102 and is eccentrically rotated, so that the tip of the pump unit 103 that transfers the target liquid is placed at the tip of the pump unit 103. An end stud 104 for applying and filling the target liquid is provided. The end stud 104 is divided into a nozzle 105 and a needle 106 so as to facilitate cleaning. Since the liquid to be transferred is at a high pressure, the needle 106 is fastened to the nozzle 105 by applying a nut 107 (female screw portion) to the male screw portion 105a of the nozzle 105.
Japanese Patent Publication No.59-4558 (page 3, page 4 and FIG. 1) Japanese Utility Model Publication No. 4-75175 (specifications, pages 6 to 8 and FIGS. 1 and 4)

  Even if the nut 107 is screw-fastened to fasten the nozzle 105 and the needle 106 constituting the end stud 104, the male screw portion 105a of the nozzle 105 and the female screw portion of the nut 107 are removed even if they are disassembled and cleaned. It is difficult to clean thoroughly. In particular, it is difficult to clean the male thread portion 105a of the nozzle 105.

  Therefore, the inventor has conceived that if the end stud is configured by fastening the nozzle and the needle with a structure that does not use a screw, the fastening can be easily and surely performed by simply releasing the fastening. It has been reached.

  An object of this invention is to provide the uniaxial eccentric screw pump which can wash | clean the nozzle and needle which comprise an end stud easily and reliably.

  According to the first aspect of the present invention, a target liquid is transferred by rotating a male screw type rotor that is driven to rotate into a female screw type stator so as to rotate eccentrically, and the target liquid is applied and applied through an end stud at the tip of the pump. In a single-shaft eccentric screw pump that performs filling, the end stud has a needle inserted into the tip of the nozzle, and is held in from both the left and right sides by a two-part joint sleeve, and a safety sleeve is fitted outside the joint sleeve. It is characterized by. That is, the end stud is configured by fastening the nozzle and the needle without using screw fastening, by using the joint sleeve and the safety sleeve divided into two.

  By doing so, the needle is fastened to the nozzle by fitting the safety sleeve outside the joint sleeve that holds the needle in the state where the needle is inserted at the tip of the nozzle. Instead, the nozzle and the needle are fastened to form an end stud. Therefore, since the nozzle or needle that requires cleaning does not have a threaded portion that is difficult to clean, it is possible to easily and reliably perform cleaning.

  Further, since the joint sleeve can be divided into two parts and released by simply sliding the safety sleeve, the needles having different sizes can be easily exchanged.

  Moreover, since the needle is fastened to the nozzle by embedding from the left and right by the two-part joint sleeve and fitting into the joint sleeve by sliding the safety sleeve, the needle can be replaced without using a tool. Can do.

  According to a second aspect of the present invention, the safety sleeve is slidably provided between the outer peripheral portion of the nozzle and the outer peripheral portion of the joint sleeve in a state where a needle is inserted into the tip of the nozzle. A stopper portion for restricting the movement of the safety sleeve may be provided on the distal end side of the joint sleeve.

  In this way, the safety sleeve fitted on the outside of the joint sleeve can be positioned on the outer peripheral portion of the nozzle, so that the loss of the safety sleeve is avoided.

  Also, when the safety sleeve is positioned outside the joint sleeve and the needle and nozzle are fastened, the safety sleeve is prevented from falling off at the stopper portion of the joint sleeve, and the safety sleeve may be inadvertently detached from the joint sleeve. Disappear.

  Since it comprised as mentioned above, since this invention fastens the nozzle and needle which comprise an end stud with the structure which does not use a screw, they can be disassembled easily, and the end stud which is a wetted part The (nozzle and needle) can be easily and reliably cleaned.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a uniaxial eccentric screw pump according to the present invention, and FIG. 2 is an exploded perspective view thereof.

  As shown in FIG. 1, the uniaxial eccentric screw pump 1 includes a pump unit 2 and a drive unit 3. In the installed state, the pump 1 is placed vertically with the pump longitudinal direction being the vertical direction, and the pump unit 2 is located on the lower side and the drive unit 3 is located on the upper side. Used for applying or filling liquids.

  The pump unit 2 includes a pump body 6 and a pump casing 7 in which the rotor 4 rotates eccentrically in the stator 5. The rotor 4 is connected via a joint 9 (Oldham joint) to a drive shaft (not shown) that is rotationally driven by a motor 8 with a speed reducer in the pump casing 7. Thereby, the rotor 4 is rotationally driven by the motor 8. The pump casing 7 is formed with a suction port 7a that communicates with a pump chamber (not shown).

  One end of the pump body 6 is provided with an end stud 11 for applying or filling the target liquid. One end of a cylindrical pump casing 7 is connected to the other end of the pump body 6, and one end of an intermediate adapter 13 is connected to the other end of the pump casing 7. A motor 8 with a speed reducer is provided at the other end of the intermediate adapter 13 via a speed reducer mounting base 14. The intermediate adapter 13, the speed reducer mounting base 14, and the motor 8 with speed reducer constitute the drive unit 3.

  In the pump casing 7, a drive shaft (not shown) extending from the motor 8 with a speed reducer is connected to the rotor 4 via the joint 9 so as to rotate together.

  As shown in FIGS. 3 to 5, the end stud 11 basically includes a joint sleeve 23 and a safety sleeve 24 in addition to a nozzle 21 and a needle 22 which are main components.

  The nozzle 21 includes a main body 21a having one end connected to the front end of the pump main body 6, a front end 21b connected to the other end of the main body 21a, and a needle 22 fitted to the outer side of the front end via a sealing material 25. Have A connecting portion 21ba into which the needle 22 is fitted is formed at the distal end portion 21b, and a circumferential recess 21bb in which the sealing material 25 is provided is formed at this portion 21ba.

  The joint sleeve 23 is a two-divided type composed of two members 23A and 23B. A circular concave portion 23a is formed on the inner peripheral surface side, while a circular convex portion 23b (outwardly protruding at the outer peripheral surface side tip). Stopper part) is provided. In a state where the needle 22 and the nozzle 21 are embraced by the two members 23A and 23B constituting the joint sleeve 23 from both the left and right sides, the circumferential recess 23a has a flange 22a of the needle 22 and an intermediate flange 21bc (tip portion) of the nozzle 21. 21b) is fitted. In this fitted state, the outer peripheral surface of the joint sleeve 23 is substantially flush with the outer peripheral surface of the tip 21 a of the nozzle 21.

  When the end stud 11 is disassembled (before assembly), the safety sleeve 24 is slidably fitted to the tip portion 21b (portion near the main body portion 21a) of the nozzle 21. That is, the safety sleeve 24 is in the first position P1 located on the outer periphery of the tip 21b of the nozzle 21. As described above, the safety sleeve 24 is positioned on the outer periphery of the joint sleeve 23 with respect to the nozzle 21 in a state where the outer peripheral surface of the joint sleeve 23 and the outer peripheral surface of the tip 21 a of the nozzle 21 are substantially flush with each other. The needle 22 can be slid and moved to the second position P2 where the needle 22 is fastened and fixed. The safety sleeve 24 is configured to be able to alternatively take the first position P1 or the second position P2. A circumferential recess 24 a is formed on the inner peripheral surface side of the safety sleeve 24, and a sealing material 26 that seals between the joint sleeve 23 is provided in the circumferential recess 24 a.

  The nozzle 21 (main body portion 21a) includes two hook-shaped locking portions 21aa and 21ab protruding symmetrically outward in the radial direction. An engaging portion 31a provided at one end of the long rod-shaped stay member 31 is detachably engaged with the two engaging portions 21aa and 21ab. The stay member 31 and the engaging portion 31a can be formed integrally.

  The other end portion of the stay member 31 is a small-diameter screw portion 31b, and a nut 32 is screwed into the small-diameter screw portion 31b. The small-diameter threaded portion 31b of the stay member 31 is fitted into the engaging portions 13a and 13b of the intermediate adapter 13 in a state where the engaging portions 21aa and 21ab of the nozzle 21 and the engaging portion 31a of the stay member 31 are engaged. By tightening the nut 32, the pump body 6 and the pump casing 7 can be clamped between the end stud 11 and the intermediate adapter 13.

  If comprised in this way, in the state which fitted the needle 22 to the outer side of the front-end | tip part 21b of the nozzle 21, it embracs from both right and left with both the members 23A and 23B of the joint sleeve 23 (in this embraced state, it is the joint sleeve 23). In addition, the safety sleeve 24 is slid to the outer peripheral side of the joint sleeve 23 in this holding state (by sliding from the first position P1 to the second position P2). The sleeve 24 can be easily fitted on the outer peripheral side of the joint sleeve 23. As a result, the needle 22 is completely fastened and fixed to the tip of the nozzle 21 by the joint sleeve 23 and the safety sleeve 24, and even if the discharge pressure of the target liquid from the needle 22 becomes high, the nozzle 21 and the needle 22 are There is no worry of liquid leakage from the connecting part.

  Then, the engaging portions 31a of the stay member 31 are detachably engaged with the engaging portions 21aa and 21ab of the nozzle 21, respectively, and the small-diameter screw portion 31b of the stay member 31 is connected to the intermediate adapter while maintaining the engagement. The end stud 11 is fixed to the distal end portion of the pump body 6 via the two stay members 31 by being fitted into the 13 engaging portions 13a and 13b and tightening the nut 32 with respect to the small diameter screw portion 31b. Become.

  When cleaning, it is necessary to release the fastening. First, loosen the nut 32 for each stay member 31 and shift it laterally to engage the engaging portions 13a and 13b of the intermediate adapter 13 and the small diameter screw portion. Both stay members 31 are removed by releasing the engagement with 31b and then releasing the engagement with the engagement portion 31a of the stay member 31 from the engagement portions 21aa and 21ab of the nozzle 21.

  Thereafter, the safety sleeve 24 is slid to the tip 21b of the nozzle 21 to release the fastening of the joint sleeve 23, the members 23A and 23B are divided and removed, and the needle 22 is removed from the nozzle 21.

  As a result, the nozzle 21, the needle 22, the joint sleeve 23 (members 23A and 23B) and the safety sleeve 24 can be disassembled, and since no thread portion is used for each of these parts, each can be easily and It can be washed reliably.

  Further, the joint sleeve 23 is of a two-divided type, and the circumferential recess 23a is fitted from the outside into the flange portion 22a of the needle 22 and the intermediate flange portion 21bc of the nozzle 21, so that the joint sleeve for the needle 22 and the nozzle 21 is provided. The positioning of the 23 connections is also made at the same time.

  Furthermore, when the safety sleeve 24 is slid to the outer periphery of the joint sleeve 23 (that is, when the safety sleeve 24 is moved from the first position P1 to the second position P2), the circumferential protrusion 23b causes the safety sleeve 24 to move toward the distal end side. Since the movement is restricted, the state where the needle 22 is fastened to the nozzle 21 by the safety sleeve 24 via the joint sleeve 23 is maintained. In addition, there is no possibility that the safety sleeve 24 will inadvertently fall off from the joint sleeve 23 due to the circumferential convex portion 23b.

It is a perspective view of the uniaxial eccentric screw pump concerning the present invention. It is the same exploded perspective view. It is a front view of the end stud concerning the present invention. It is sectional drawing in the AA of FIG. It is a disassembled perspective view of the end stud which concerns on this invention. It is sectional drawing which shows the conventional uniaxial eccentric screw pump.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Uniaxial eccentric screw pump 2 Pump part 3 Drive part 4 Rotor 5 Stator 6 Pump main body 11 End stud 21 Nozzle 22 Needle 23 Joint sleeve 23A, 23B Member 23a Circumferential recessed part 23b Circumferential convex part (stopper part)
24 Safety sleeve

Claims (2)

A uniaxial eccentric screw pump that feeds and fills the target liquid through an end stud at the front end of the pump by rotating and driving a male screw rotor that is rotationally inserted into a female threaded stator and rotating it eccentrically. In
The end stud is a uniaxial eccentric screw pump in which a needle is inserted into a tip of a nozzle, they are held in from both left and right sides by a joint sleeve, and a safety sleeve is fitted to the outside of the joint sleeve. The safety sleeve is slidably provided between the outer peripheral portion of the nozzle and the outer peripheral portion of the joint sleeve in a state where a needle is inserted into the tip of the nozzle,
The single-shaft eccentric screw pump according to claim 1, wherein a stopper portion for restricting movement of the safety sleeve is provided on a distal end side of the joint sleeve.

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