A purification device for diamond production

Abstract

This invention relates to the field of diamond purification technology, specifically disclosing a purification device for diamond production, including an acid washing cylinder with an inlet and an outlet. The acid washing cylinder also contains a crushing chamber, with a bottom plate rotatably fitted to the bottom of the crushing chamber. The bottom plate has several through holes. The crushing chamber contains a fixed component, a movable component, and a driving component. The inlet and outlet are both connected to the inside of the crushing chamber. Both the fixed component and the movable component are planar spiral-shaped. The fixed component is fixed relative to the crushing chamber, with a gap between the fixed component and the bottom plate. The driving component drives the movable component to rotate around its center. When the movable component rotates, it squeezes the material inside the crushing chamber. The bottom end of the bottom plate also has a transmission assembly, which is connected to both the driving component and the bottom plate. The transmission assembly drives the bottom plate to rotate synchronously with the movable component in the same or opposite directions. The purification device provided by this invention improves the cleaning effect on small particles of material after crushing during the purification process.

Description

Technical Field

[0001] This invention relates to the field of diamond purification technology, and more specifically to a purification device for diamond production. Background Technology

[0002] Diamond purification refers to the process of extracting pure diamond from diamond ore containing impurities. When purifying diamond, the ore containing diamond first needs to be crushed into smaller particles. Then, the crushed diamond is cleaned by acid washing to remove impurities (such as graphite, metal catalysts, and pyrophyllite) from the diamond surface. In order to improve the efficiency of diamond purification, related technologies often use purification devices to perform integrated crushing and cleaning operations on diamond.

[0003] Patent document CN115571883B discloses a purification device for the preparation of crystalline silicon for photovoltaic materials, including a frame, an acid washing cylinder, a stirring column, a sieve ring, a mounting plate, and a lifting component. The acid washing cylinder is mounted on the frame and has a stirring chamber. The sieve ring is mounted on the inner wall of the stirring chamber and divides the stirring chamber into a large particle receiving chamber and a small particle receiving chamber. The large particle receiving chamber is located below the lower particle receiving chamber. The sieve ring has a material distribution hole, through which smaller particles in the large particle receiving chamber enter the small particle receiving chamber. The lifting component is mounted on the frame, and the mounting plate is mounted on the lower end of the lifting component. The stirring column is vertically rotatably mounted on the mounting plate and is used to stir the mixture in the stirring chamber. The lifting component is used to drive the stirring column to move up and down relative to the stirring chamber.

[0004] The purification device provided in this patent document is used to crush and clean particulate materials. During operation, the material is first put into the large particle receiving chamber, and then the stirring column is driven to move up and down repeatedly by the lifting component. When the lifting column moves up and down repeatedly, it squeezes the material, causing the large particles to break. During the longitudinal movement of the lifting column, it generates longitudinal disturbance to the liquid in the large particle receiving chamber. The crushed small particles move upward under the action of the water flow and enter the small particle receiving chamber.

[0005] The purification device provided in the aforementioned patent document crushes and acid-washes large particles and a small portion of small particles within a large particle containment chamber. Most of the crushed small particles enter the small particle containment chamber. In the diamond purification process, due to the strong adhesion of surface impurities, if the purification device in the aforementioned patent document is used to crush and acid-wash diamond, the crushed diamond ore will quickly enter the small particle containment chamber under the action of water flow, resulting in insufficient contact between the crushed diamond ore and the cleaning solution, leading to an unsatisfactory diamond cleaning effect. Summary of the Invention

[0006] This invention provides a purification device for diamond production, aiming to solve the problem in related technologies where the purification device does not achieve ideal cleaning effect during diamond ore purification due to insufficient contact between diamond and cleaning solution.

[0007] The present invention discloses a purification device for diamond production, comprising an acid washing cylinder filled with a cleaning solution for cleaning materials, an inlet and an outlet on the acid washing cylinder, and a crushing chamber inside the acid washing cylinder. A bottom plate is rotatably fitted to the bottom of the crushing chamber, and the bottom plate is provided with several through holes. The crushing chamber is provided with a fixed component, a movable component and a driving component. The inlet and the outlet are both connected to the interior of the crushing chamber.

[0008] Both the fixed component and the movable component are planar spiral-shaped. The fixed component is fixed relative to the crushing chamber, and a gap is left between the fixed component and the bottom plate. The driving component drives the movable component to rotate around its center. When the movable component rotates, the distance between it and the fixed component decreases, and the material in the crushing chamber is squeezed.

[0009] The bottom end of the base plate is also provided with a transmission assembly, which is connected to both the driving component and the base plate. The transmission assembly is used to drive the base plate to rotate synchronously in the same direction or in the opposite direction with the moving component.

[0010] Preferably, the transmission assembly includes a gear, a movable wheel, and a transmission part. The gear is fixed relative to the driving end of the driving member and rotates with the base plate. The transmission part is arranged in a ring at the bottom of the base plate, and the inner ring of the transmission part is toothed. The movable wheel is located between the gear and the transmission part and meshes with both the gear and the transmission part. The movable wheel is connected to a connecting member. The transmission assembly also includes a limiting structure, which is used to limit the relative rotation state between the movable wheel and the connecting member.

[0011] Preferably, the connecting member includes a connecting part and a connecting shaft, the movable wheel is sleeved on the connecting shaft, the limiting structure includes a limiting member, ratchet teeth and a ratchet rack, the ratchet rack is slidably engaged with the connecting part, multiple ratchet teeth are circumferentially arranged on the connecting shaft, the connecting shaft is unidirectionally rotated with the ratchet rack through each of the ratchet teeth, the limiting member is fixed relative to the crushing chamber, the connecting shaft is slidably engaged with the limiting member, the limiting member is provided with a limiting part one and a limiting part two, the limiting part one and the limiting part two are respectively arranged at both ends of the sliding path of the movable wheel, when the limiting part one abuts against the ratchet rack, it pushes the ratchet rack to engage with the ratchet teeth, when the limiting part two abuts against the ratchet rack, it pushes the ratchet rack to separate from the ratchet teeth.

[0012] Preferably, the connecting part is connected to a guide member, the shape of which is consistent with the sliding path of the movable wheel, the guide member slides in cooperation with the second limiting part, and an elastic member is also sleeved between the second limiting part and the connecting part, the connecting part presses the elastic member when it approaches the second limiting part.

[0013] Preferably, at least two support legs are fixed to the outer wall of the crushing chamber, each support leg is fixed relative to the pickling cylinder, and each support leg extends on the lower side of the base plate in a direction close to the axial direction of the crushing chamber and is fixed to the limiting member.

[0014] Preferably, the crushing chamber is further provided with a cleaning component, which includes a lifting component and a scrubbing component. The scrubbing component is located outside the fixing component. The protruding end of the lifting component is connected to the upper side of the scrubbing component and drives the scrubbing component to move longitudinally within the crushing chamber.

[0015] Preferably, the end face of the scrubbing member opposite to the base plate is provided with raised texture.

[0016] Preferably, the thickness of the bottom plate decreases along the direction close to its edge, and the discharge component includes a cylinder and a screw conveyor shaft. The screw conveyor shaft is disposed inside the cylinder and conveys the material inside the cylinder from bottom to top.

[0017] Preferably, the upper side of the cylinder is provided with a discharge port, which is inclined downward in a direction away from the cylinder.

[0018] The beneficial effects of this invention are as follows: it improves the purification effect of diamond ore. The moving and fixed parts in the crushing chamber work together to continuously crush the material added to the crushing chamber. The crushed material gradually moves from the gap between the fixed part and the bottom plate to the edge of the bottom plate. Under the rotational cooperation of the bottom plate and the washing part, the small particles of crushed material are washed. The purification device provided by this invention achieves thorough cleaning of the crushed material and effectively improves the cleaning effect of the crushed material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the internal structure of the pickling cylinder in this invention.

[0021] Figure 3 This is a schematic diagram of the internal structure of the crushing chamber in this invention.

[0022] Figure 4 This is a schematic diagram showing the positional relationship between the movable component and the fixed component in the reset state of this invention.

[0023] Figure 5 This is a schematic diagram showing the positional relationship between the movable part and the fixed part in the working state of the present invention.

[0024] Figure 6 This is a schematic diagram of the cooperation relationship between the transmission component and the base plate in this invention.

[0025] Figure 7 yes Figure 6 Enlarged view of section B.

[0026] Figure label:

[0027] 1. Pickling drum; 11. Feed inlet; 12. Drum body; 13. Screw conveyor shaft; 14. Discharge outlet; 2. Drive component; 21. Crushing chamber; 211. Support leg; 22. Base plate; 221. Transmission unit; 23. Moving part; 24. Fixed part; 25. Washing part; 26. Lifting part; 3. Gear; 31. Moving wheel; 311. Connecting part; 312. Connecting shaft; 313. Ratchet; 32. Limiting part; 321. Guide groove; 322. Limiting part one; 323. Limiting part two; 324. Guide component; 325. Elastic component. Detailed Implementation

[0028] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0029] like Figures 1 to 3 As shown, the purification device for diamond production of the present invention includes an acid washing cylinder 1, which is filled with a cleaning solution for acid washing of materials. The acid washing cylinder 1 is provided with an inlet 11 and an outlet. The acid washing cylinder 1 is provided with a crushing chamber 21. The inlet 11 and the outlet are both connected to the inside of the crushing chamber 21. The material to be processed enters the crushing chamber 21 through the inlet 11 and is crushed and acid washed in the crushing chamber 21. The material after crushing and acid washing is discharged and collected through the outlet and enters the subsequent processing steps.

[0030] like Figures 3 to 5As shown, a base plate 22 is rotatably fitted to the bottom of the crushing chamber 21. Several through holes are evenly distributed on the base plate 22. The internal space of the crushing chamber 21 is connected to the internal space of the pickling cylinder 1 through these through holes. The cleaning liquid in the pickling cylinder 1 enters the crushing chamber 21 through these through holes. The crushing chamber 21 is equipped with a fixed component 24, a movable component 23, and a driving component 2. Both the fixed component 24 and the movable component 23 are planar spiral-shaped. The bottom end of the movable component 23 is in contact with the upper surface of the base plate 22, while a gap exists between the bottom end of the fixed component 24 and the upper surface of the base plate 22. This gap is used for screening the crushed material. After the material is crushed to a suitable size, it can pass through the gap between the fixed component 24 and the base plate 22 to a location away from the center of the base plate 22. The fixed part 24 and the movable part 23 are separated by a gap. The driving end of the driving part 2 is connected to the vortex center of the movable part 23. The driving part 2 drives the movable part 23 to rotate around its vortex center. The driving part 2 can be a motor. When the driving part 2 drives the movable part 23 to rotate, the gap between the movable part 23 and the fixed part 24 changes. By controlling the driving part 2 to rotate back and forth, the size of the gap between the movable part 23 and the fixed part 24 can be repeatedly adjusted, and the material entering between the movable part 23 and the fixed part 24 can be squeezed and crushed. The bottom plate 22 is rotatably engaged with the crushing chamber 21. When the bottom plate 22 rotates relative to the crushing chamber 21, it drives the material falling on the bottom plate 22 to move between the fixed part 24 and the movable part 23.

[0031] like Figures 4 to 7 As shown, the bottom end of the base plate 22 is also provided with a transmission assembly. The transmission assembly is connected to both the drive member 2 and the base plate 22. The transmission assembly is used to drive the base plate 22 to rotate synchronously with the movable member 23 in the forward or reverse direction. Its working state is when the movable member 23 rotates forward and approaches the fixed member 24 to squeeze the material, and its reset state is when the movable member 23 rotates in the reverse direction and moves away from the fixed member 24. Figure 5 This refers to the relative positional relationship between the movable part 23 and the fixed part 24 in the working state. Figure 4 The relative positional relationship between the movable part 23 and the fixed part 24 in the reset state, and the discharge end of the feed inlet 11 and Figure 4 The positions of areas A and B are opposite. The material to be processed falls into area A. The rotation direction of the base plate 22 is always consistent with the forward rotation direction of the movable part 23. When the base plate 22 rotates forward, it continuously transports the material that falls into area A to between the fixed part 24 and the movable part 23.

[0032] The transmission assembly includes a gear 3, a movable wheel 31, and a transmission part 221. The gear 3 is rotatably mounted against the bottom end face of the base plate 22. The gear 3 is coaxial with the base plate 22 and fixed relative to the driving end of the driving member 2. The gear 3 rotates synchronously with the movable member 23. The transmission part 221 is arranged in a ring at the bottom of the base plate 22. The inner ring of the transmission part 221 is toothed. The movable wheel 31 is located between the gear 3 and the transmission part 221. The movable wheel 31 meshes with both the gear 3 and the transmission part 221. The movable wheel 31 is connected to a connecting member, which includes a connecting part 311 and a connecting shaft 312. The connecting shaft 312 is rotatably engaged with the connecting part 311. The movable wheel 31 is fixedly sleeved on the connecting shaft 312. The transmission assembly also includes a limiting structure, which is used to limit the relative rotation state between the movable wheel 31 and the connecting shaft 312.

[0033] The limiting structure includes a limiting member 32, ratchet teeth, and a ratchet rack 313. The ratchet rack 313 is slidably engaged with the connecting part 311. There are multiple ratchet teeth, each of which is circumferentially arranged on the connecting shaft 312. The connecting shaft 312 is unidirectionally engaged with the ratchet rack 313 through each ratchet tooth. When the ratchet teeth and the ratchet rack 313 are locked relative to each other, the connecting shaft 312 does not rotate relative to the connecting part 311, and the movable wheel 31 also cannot rotate. When the gear 3 rotates forward with the movable member 23, the movable wheel 31 is in a locked state. Under the meshing action of the movable wheel 31 and the gear 3, the movable wheel 31 slides along an arc path and drives the base plate 22 to rotate in the same direction as the movable member 23 under the action of the transmission part 221. That is, while the movable member 23 rotates forward to squeeze the material, the base plate 22 rotates to drive the material falling in area A to move towards the area between the movable member 23 and the fixed member 24, so that the falling material can be fully crushed.

[0034] A limiting member 32 is disposed between the gear 3 and the connecting part 311. The limiting member 32 is rotatably engaged with the base plate 22. The limiting member 32 can be annular. Specifically, the limiting member 32 can be fixed relative to the crushing chamber 21. At least two support legs 211 are fixed on the outer wall of the crushing chamber 21. Each support leg 211 is fixed relative to the bottom of the pickling cylinder 1. Each support leg 211 extends from the lower side of the base plate 22 in a direction close to the axial direction of the crushing chamber 21 and is fixed with the limiting member 32. The limiting member 32 is also provided with an arc-shaped guide groove 321. The shape of the guide groove 321 matches the sliding path of the movable wheel 31, and the center of the guide groove 321 coincides with the center of the base plate 22 and the gear 3. The limiting member 32 is provided with a limiting function. Part 1 322 and Limiting Part 2 323 are respectively opposite to the two ends of the guide groove 321, that is, Limiting Part 1 322 and Limiting Part 2 323 are respectively located at the two ends of the sliding path of the movable wheel 31. When the movable wheel 31 is in the locked state, it slides from Limiting Part 1 322 to Limiting Part 2 323. Limiting Part 1 322 and Limiting Part 2 323 are in active contact with the ratchet 313. When the limiting part contacts the ratchet 313, it pushes the ratchet 313 to engage with the ratchet teeth, so that the movable wheel 31 enters the locked state. When Limiting Part 2 323 contacts the ratchet 313, it pushes the ratchet 313 to disengage from the ratchet teeth, and the movable wheel 31 returns to the rotatable state.

[0035] The connecting part 311 is also connected to a guide member 324. The guide member 324 is in the shape of an arc rod. The shape of the guide member 324 is also adapted to the sliding path of the movable wheel 31. The guide member 324 slides in cooperation with the second limiting part 323. An elastic member 325 is sleeved between the second limiting part 323 and the connecting part 311. When the connecting part 311 approaches the second limiting part 323, it squeezes the elastic member 325. The elastic member 325 can be a spring.

[0036] When the driving component 2 drives the movable component 23 and gear 3 to rotate in the forward direction, the movable wheel 31 slides from the position of the first limiting part 322 to the position of the second limiting part 323 in a locked state. As the movable wheel 31 approaches the second limiting part 323, it continuously squeezes the elastic element 325 and causes the elastic element 325 to accumulate force. During the forward sliding of the movable wheel 31, the transmission part 221 drives the base plate 22 to rotate in the forward direction, continuously conveying the material falling in the area of ​​the base plate 22A to the space between the movable component 23 and the fixed component 24, so that the material is fully squeezed and crushed. The connecting part moves with the movable wheel 31, and the ratchet 313 and the limiting part When the two parts 323 come into contact, the ratchet on the relative connecting shaft 312 disengages, releasing the restriction on the rotation of the connecting shaft 312 and the movable wheel 31. During the crushing process of the material, the driving part 2 will reciprocate to drive the movable part 23 to rotate in both directions. When the driving part 2 drives the movable part 23 and the gear 3 to rotate in the opposite direction, the movable wheel 31 rotates around its axis under the meshing action with the gear 3, and pushes the bottom plate 22 to rotate in the opposite direction relative to the gear 3 through the movable part. That is, during the process of the movable part 23 repeatedly crushing the material in both directions, the bottom plate 22 always maintains forward rotation and continuously conveys the material between the movable part 23 and the fixed part 24.

[0037] Under the elastic force of the elastic element 325, the movable wheel 31 will slide along the guide groove 321 during the forward rotation until the ratchet 313 abuts against the limiting part 1 322. The limiting part 1 322 pushes the ratchet 313 to re-engage with the ratchet on the connecting shaft 312, locking the rotation of the connecting shaft 312 and the movable wheel 31. That is, the movable wheel 31 moves from the limiting part 1 322 to the limiting part 2 323 in a sliding state, and at the same time moves from the limiting part 2 323 to the limiting part 1 322 in a rotating and sliding state.

[0038] After the material is crushed to a suitable size, it moves through the gap between the fixing member 24 and the bottom plate 22 to the edge of the bottom plate 22. After rotating with the bottom plate 22 until it is opposite the discharge member, it enters the discharge member. To further improve the acid washing effect on the crushed material, a cleaning component is also provided in the crushing chamber 21. The cleaning component includes a lifting member 26 and a scrubbing member 25. The scrubbing member 25 is located outside the fixing member 24. The extended end of the lifting member 26 is connected to the upper side of the scrubbing member 25. The lifting member 26 drives the scrubbing member 25 to move within the crushing chamber. The material moves longitudinally within the crushing chamber 21. The lifting component 26 can be a cylinder. The crushed material moves to the outside of the fixed component 24 and enters the underside of the scrubbing component 25. The lifting component 26 drives the scrubbing component 25 to move downward until the scrubbing component 25 presses against the material. The bottom plate 22 rotates relative to the scrubbing component 25, so that the small particles between the scrubbing component 25 and the bottom plate 22 are further scrubbed and cleaned, improving the cleaning effect on the material. To further improve the cleaning effect, the bottom end face of the scrubbing component 25 can also be provided with raised texture.

[0039] To facilitate the sliding of small particles towards the edge of the bottom plate 22, the thickness of the bottom plate 22 can be reduced in the direction close to its edge. The discharge component includes a cylinder 12 and a screw conveyor shaft 13. The screw conveyor shaft 13 is located inside the cylinder 12 and is used to convey the material inside the cylinder 12 from bottom to top. The upper side of the cylinder 12 is provided with a discharge port 14, which is inclined downward in the direction away from the cylinder 12.

[0040] The purification device for diamond production provided by this invention can promote full contact between the crushed small particles and the pickling solution while crushing diamond ore, thereby improving the cleaning effect of diamond ore during purification treatment.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A purification apparatus for diamond production, comprising an acid washing cylinder filled with a cleaning solution for cleaning materials, the acid washing cylinder having an inlet and an outlet, characterized in that, The pickling drum is also equipped with a crushing chamber. The bottom of the crushing chamber is fitted with a base plate that rotates around it. The base plate has several through holes. The crushing chamber is equipped with fixed parts, moving parts and driving parts. The feed inlet and the discharge part are connected to the inside of the crushing chamber. Both the fixed part and the moving part are planar spiral-shaped. The bottom end of the moving part is in contact with the upper surface of the base plate. The fixed part is fixed relative to the crushing chamber. There is a gap between the fixed part and the base plate. There is a gap between the fixed part and the moving part. The driving part drives the moving part to rotate around its center. When the moving part rotates, the gap between it and the fixed part decreases and the material in the crushing chamber is squeezed. The bottom end of the base plate is also equipped with a transmission assembly, which is connected to both the drive component and the base plate. When the base plate rotates relative to the crushing chamber, it drives the material falling onto the base plate to move between the fixed component and the moving component. The transmission assembly includes a gear, a movable wheel, and a transmission part. The gear is fixed relative to the driving end of the driving component and rotates with the base plate. The transmission part is arranged in a ring at the bottom of the base plate. The inner ring of the transmission part is toothed. The movable wheel is located between the gear and the transmission part and meshes with both the gear and the transmission part. The movable wheel is connected to a connecting part. The transmission assembly also includes a limiting structure, which is used to limit the relative rotation state between the movable wheel and the connecting part. The connecting component includes a connecting part and a connecting shaft. The movable wheel is sleeved on the connecting shaft. The limiting structure includes a limiting member, ratchet teeth, and a ratchet rack. The ratchet rack is slidably engaged with the connecting part. There are multiple ratchet teeth arranged circumferentially on the connecting shaft. The connecting shaft is unidirectionally engaged with the ratchet rack through each ratchet tooth. The limiting member is fixed relative to the crushing chamber. The connecting shaft is slidably engaged with the limiting member. The limiting member is provided with a limiting part one and a limiting part two. The limiting part one and the limiting part two are respectively located at both ends of the sliding path of the movable wheel. When the limiting part one abuts against the ratchet rack, it pushes the ratchet rack to engage with the ratchet teeth. When the limiting part two abuts against the ratchet rack, it pushes the ratchet rack to separate from the ratchet teeth. The crushing chamber is also equipped with a cleaning component, which includes a lifting component and a scrubbing component. The scrubbing component is located outside the fixed component. The extended end of the lifting component is connected to the upper side of the scrubbing component and drives the scrubbing component to move longitudinally within the crushing chamber.

2. The purification apparatus for diamond production according to claim 1, characterized in that, The connecting part is connected to a guide member, the shape of which is consistent with the sliding path of the movable wheel. The guide member slides in cooperation with the second limiting part. An elastic member is also sleeved between the second limiting part and the connecting part. When the connecting part approaches the second limiting part, it squeezes the elastic member.

3. The purification apparatus for diamond production according to claim 1, characterized in that, At least two support legs are fixed to the outer wall of the crushing chamber. Each support leg is fixed relative to the pickling cylinder. Each support leg extends from the lower side of the base plate in a direction close to the axial direction of the crushing chamber and is fixed to the limiting member.

4. The purification apparatus for diamond production according to claim 1, characterized in that, The end face of the scrubbing component opposite to the base plate is provided with raised texture.

5. The purification apparatus for diamond production according to claim 1, characterized in that, The thickness of the base plate decreases along its edge. The discharge component includes a cylinder and a screw conveyor shaft. The screw conveyor shaft is located inside the cylinder and conveys the material inside the cylinder from bottom to top.

6. The purification apparatus for diamond production according to claim 5, characterized in that, The upper side of the cylinder is provided with a discharge port, which is inclined downward in a direction away from the cylinder.

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