Cast-aluminum rotor reaming device

Abstract

The utility model relates to the technical field of machining process equipment, in particular to a reaming device for a cast-aluminum rotor. Comprising a base, a sliding table movably arranged on the base in the left-right direction, a pair of stand columns vertically arranged on the front side and the rear side of the upper end face of the sliding table, a bridge plate connected between the tops of the pair of stand columns and a jacking air cylinder installed on the bridge plate, wherein a piston rod of the jacking air cylinder faces downwards. The pressing block is arranged at the lower end of a piston rod of the jacking air cylinder, a pair of cylindrical positioning rods parallel to the left-right direction are arranged at the position, below the pressing block, of the upper end face of the sliding table in a spaced mode, and a rotating shaft used for installing a reamer is rotationally arranged at the position, on one side of the left-right direction, of the base; the base is further provided with a linear execution element used for driving the sliding table to move in the left-right direction. According to the utility model, the reaming efficiency of the cast-aluminum rotor is improved, and the labor intensity of reaming operation of operators is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of machining process equipment, and particularly relates to a reaming device for a cast aluminum rotor. Background Technique

[0002] A cast aluminum rotor is a kind of motor rotor formed after high-pressure casting aluminum on a rotor core. During the manufacturing process of the high-pressure cast aluminum rotor, reaming operation needs to be carried out on the inner hole of the core to improve the inner hole precision of the cast aluminum rotor. The original conventional reaming operation of this cast aluminum rotor is carried out on a drilling machine. After positioning and clamping the cast aluminum rotor with a special positioning tooling, the reaming operation is carried out.

[0003] The deficiencies of the above-mentioned conventional reaming operation of the cast aluminum rotor are: the time for auxiliary clamping and disassembling parts during the reaming operation is long, the efficiency of the reaming operation is not high, and the labor intensity of the operator is relatively large.

[0004] Therefore, it is necessary to improve the technology to solve the above problems. Content of the Utility Model

[0005] In order to solve the above problems, the utility model provides a reaming device for a cast aluminum rotor, aiming to improve the efficiency of the reaming operation of the cast aluminum rotor and reduce the labor intensity of the operator during the reaming operation. The specific technical solutions are as follows:

[0006] A reaming device for a cast aluminum rotor includes a base, a sliding table movably arranged on the base in the left-right direction, a pair of columns erected at the front and rear sides of the upper end surface of the sliding table, a bridge plate connected between the tops of the pair of columns, a pressing cylinder with a piston rod facing downwards installed on the bridge plate, a pressing block arranged at the lower end of the piston rod of the pressing cylinder. A pair of cylindrical positioning rods parallel to the left-right direction are arranged at intervals at the lower position of the upper end surface of the sliding table below the pressing block. A rotating shaft for installing a reamer is rotatably arranged at one side of the base in the left-right direction. A linear actuator for driving the sliding table to move in the left-right direction is also arranged on the base.

[0007] In the utility model, the sliding table is movably arranged on a pair of cylindrical guide rails. The two ends of the cylindrical guide rails are respectively connected with supports, and the supports are fixedly connected with the base.

[0008] Preferably, the linear actuator is a servo electric push rod.

[0009] Preferably, a pair of guide rods are erected upwards on the upper end surface of the pressing block, and a pair of guide holes are correspondingly arranged on the bridge plate. The pair of guide rods are correspondingly slidably arranged in the pair of guide holes.

[0010] By providing the guide rod on the briquetting block, the reliability of clamping the parts is improved when the piston rod of the jacking cylinder has a long stroke.

[0011] In the present utility model, a reduction gearbox is provided at one side of the base in the left - right direction, and the rotating shaft is the output shaft of the reduction gearbox.

[0012] In the present utility model, a driving motor for driving the rotating shaft to rotate is provided on the reduction gearbox.

[0013] Preferably, a lifting adjustment seat is provided on the sliding table, the pair of upright columns are erected on the lifting adjustment seat on the sliding table, and the pair of cylindrical positioning rods are fixed on the lifting adjustment seat.

[0014] Preferably, connecting plates are respectively connected between the two ends of the pair of cylindrical positioning rods.

[0015] Preferably, a V - shaped groove for clamping the outer circle of the cast - aluminum rotor is provided on the lower end surface of the briquetting block.

[0016] Preferably, a bakelite insert is provided on the lower end surface of the briquetting block, and the V - shaped groove is provided on the bakelite insert.

[0017] As a further improvement of the present utility model, a purger for cleaning after reaming the cast - aluminum rotor is further provided at the other side of the base in the left - right direction; the purger includes a purging seat fixed on the base, a purging pipe fixed on the purging seat and communicated with a compressed - air pipeline, a sealing plate is provided at the front - end orifice of the purging pipe, and a plurality of purging holes communicated with the inner hole of the purging pipe are provided on the outer circle of a front - end section of the purging pipe, so that the outer circle of the front - end section of the purging pipe forms a purging head for purging the inner hole of the cast - aluminum rotor; the purging pipe is coaxially arranged with the rotating shaft and is respectively arranged on the left and right sides of the sliding table.

[0018] By providing the purger, automatic purging and cleaning of the inner hole after reaming the parts can be realized, and the cleaning efficiency is high and the cleaning quality is good.

[0019] Wherein, the outer - circle diameter of the purging head is smaller than the inner - hole diameter of the cast - aluminum rotor.

[0020] Preferably, the purging holes are evenly arranged at intervals on the outer circle of the front - end section of the purging pipe.

[0021] Wherein, the outer - circle diameter of the purging head is smaller than the inner - hole diameter of the cast - aluminum rotor.

[0022] In the present utility model, a push - rod connecting block is provided at the lower end of the sliding table, and the front end of the telescopic rod of the servo electric push - rod is fixed on the push - rod connecting block.

[0023] As a further improvement of the present utility model, a center height corrector for correcting the center height position of the inner hole of the cast aluminum rotor before reaming is further provided on the purger. The center height corrector includes an upper pipe joint hermetically welded to the upper position of the inner wall of a section at the front end of the purge pipe, and a lower pipe joint hermetically welded to the lower position of the inner wall of a section at the front end of the purge pipe. An upper air flow detection hole communicating with the upper pipe joint is further provided at the upper position of the outer circumference of a section at the front end of the purge pipe, and a lower air flow detection hole communicating with the lower pipe joint is further provided at the lower position of the outer circumference of a section at the front end of the purge pipe. The upper pipe joint and the lower pipe joint are respectively connected to an upper air flow delivery pipe and a lower air flow delivery pipe, and the upper air flow delivery pipe and the lower air flow delivery pipe are connected to a pneumatic gauge through a three-way switching valve.

[0024] In the present utility model, an electric control valve is provided on the compressed air pipeline.

[0025] In the present utility model, the pressing cylinder, the linear actuator (servo electric push rod), the driving motor, the electric control valve, the three-way switching valve and the pneumatic gauge are automatically controlled by a controller.

[0026] The usage method of the present utility model is as follows:

[0027] (1) Workpiece installation: Position the outer circumference of the cast aluminum rotor on a pair of cylindrical positioning rods, and then drive the pressing cylinder to act, so that the pressing block at the lower end of the piston rod of the pressing cylinder presses and fixes the cast aluminum rotor.

[0028] (2) Center height adjustment: Drive the linear actuator (servo electric push rod) to act, so that the sliding table moves towards the purge head side, and the purge head enters the inner hole of the cast aluminum rotor; Connect the compressed air pipeline, and spray compressed air through the purge holes on the purge head to pre-clean the inner hole of the cast aluminum rotor; After pre-cleaning, close the compressed air pipeline, and then connect the pneumatic gauge. Detect the air flow rates of the upper air flow detection hole and the lower air flow detection hole respectively through the switching of the three-way switching valve, and compare the air flow rates of the upper air flow detection hole and the lower air flow detection hole. Adjust the upper and lower height positions of the cast aluminum rotor through the lifting adjustment seat so that the air flow rates of the upper air flow detection hole and the lower air flow detection hole are equal.

[0029] (3) Reaming: Start the driving motor to drive the output shaft of the reduction gearbox (rotating shaft) and the reamer to rotate together; Drive the linear actuator (servo electric push rod) to act, so that the sliding table moves towards the reamer side, and the reamer enters the inner hole of the cast aluminum rotor for reaming; After reaming to the limit position, drive the linear actuator (servo electric push rod) to act, so that the sliding table retracts and resets to the intermediate initial position, and the cast aluminum rotor is separated from the reamer, and the reaming operation is completed.

[0030] (4) Cleaning: Drive the linear actuator (servo electric push rod) to move, so that the slide moves towards the side of the purging head, and the purging head enters the inner hole of the cast aluminum rotor; Connect the compressed air pipeline, and spray compressed air through the purging holes on the purging head to clean the inner hole of the cast aluminum rotor; After cleaning, drive the linear actuator (servo electric push rod) to move, so that the slide retracts and resets to the middle initial position, and the cleaning operation of the inner hole of the cast aluminum rotor is completed;

[0031] (5) Part taking: Turn off the drive motor to stop the rotation of the output shaft of the reduction gearbox (rotating shaft) and the reamer; Drive the pressing cylinder to move, so that the piston rod of the pressing cylinder retracts, and the pressing block at the lower end of the piston rod of the pressing cylinder releases the cast aluminum rotor, and the operator takes away the cast aluminum rotor;

[0032] (6) Circular operation: Repeat steps (1) to (4) to realize the reaming operation of the next cast aluminum rotor.

[0033] In the above step (2), during pre-cleaning, drive the linear actuator (servo electric push rod) to move, so that the slide reciprocates to realize reciprocating pre-cleaning;

[0034] Preferably, in the cleaning in step (4), the linear actuator (servo electric push rod) drives the slide to make several reciprocating movements to further improve the cleaning effect of the inner hole of the cast aluminum rotor.

[0035] The beneficial effects of the present utility model are as follows:

[0036] First, for a reaming device for a cast aluminum rotor of the present utility model, during the reaming operation, the operator only needs to be responsible for the taking and placing operations of the parts (cast aluminum rotors). Except for the taking and placing operations of the parts, the reaming operation can be automatically completed, thereby improving the efficiency of the reaming operation and reducing the labor intensity of the operator during the reaming operation.

[0037] Second, for a reaming device for a cast aluminum rotor of the present utility model, by arranging a lifting adjustment seat on the slide, it can adapt to the clamping and positioning of cast aluminum rotors with different diameter specifications, and has good versatility; Using a pair of cylindrical positioning rods for positioning can achieve automatic centering and has good positioning accuracy.

[0038] Third, for a reaming device for a cast aluminum rotor of the present utility model, a center height adjuster is arranged on the purging device, which can detect whether the gap between the outer circle of the purging head and the inner hole of the cast aluminum rotor in the up and down directions is uniform, so as to be able to automatically and accurately adjust the center height of the inner hole of the cast aluminum rotor under the control of the controller, compensate for the up and down offset error of the inner hole after positioning caused by the change of the outer diameter tolerance of the cast aluminum rotor, so as to ensure that the axis of the reamer is consistent with the inner hole of the cast aluminum rotor, thereby further improving the quality of the reaming of the cast aluminum rotor. Description of the Drawings

[0039] Figure 1 It is a schematic structural view of a reaming device for a cast aluminum rotor of the present utility model;

[0040] Figure 2 is Figure 1 the K-direction view of;

[0041] Figure 3 is Figure 1 the partial enlarged view of the purging head part involved in;

[0042] In the figure: 1, base; 2, slide table; 3, column; 4, bridge plate; 5, top pressure cylinder; 6, cylindrical guide rail; 7, pressing block; 8, cylindrical positioning rod; 9, reamer; 10, rotating shaft; 11, linear actuator (servo electric push rod); 12, guide rod; 13, support; 14, reduction box; 15, driving motor; 16, lifting adjustment seat; 17, connecting plate; 18, V-shaped groove; 19, bakelite insert; 20, purging device; 21, purging seat; 22, compressed air pipeline; 23, purging pipe; 24, purging head; 25, purging hole; 26, push rod connecting block; 27, cast aluminum rotor; 28, sealing plate; 29, center height corrector; 30, upper pipe joint; 31, lower pipe joint; 32, upper air flow detection hole; 33, lower air flow detection hole; 34, upper air flow delivery pipe; 35, lower air flow delivery pipe; 36, three-way switching valve; 37, pneumatic gauge. Specific Embodiment

[0043] The following combines the drawings and embodiments to further describe the specific embodiments of the present utility model. The following embodiments are only used to more clearly illustrate the technical solutions of the present utility model and cannot be used to limit the protection scope of the present utility model.

[0044] As Figures 1 to 3 shown is an embodiment of a reaming device for a cast aluminum rotor of the present utility model, including a base 1, a slide table 2 movably arranged on the base 1 in the left-right direction, a pair of columns 3 erected on the front and rear sides of the upper end surface of the slide table 2, a bridge plate 4 connected between the tops of the pair of columns 3, a top pressure cylinder 5 installed on the bridge plate 3 with the piston rod facing downwards, and a pressing block 7 arranged at the lower end of the piston rod of the top pressure cylinder 5. A pair of cylindrical positioning rods 8 parallel to the left-right direction are arranged at intervals below the pressing block 7 on the upper end surface of the slide table 2. A rotating shaft 10 for installing a reamer 9 is rotatably arranged at one side of the base 1 in the left-right direction. A linear actuator 11 for driving the slide table 2 to move in the left-right direction is also arranged on the base 1.

[0045] In this embodiment, the slide table 2 is movably arranged on a pair of cylindrical guide rails 6, and both ends of the cylindrical guide rails 6 are respectively connected with supports 13, and the supports 13 are fixedly connected with the base 1.

[0046] Preferably, the linear actuator 11 is a servo electric push rod.

[0047] Preferably, a pair of guide rods 12 are vertically provided on the upper end surface of the pressing block 7, a pair of guide holes are correspondingly provided on the bridge plate 4, and the pair of guide rods 12 are correspondingly slidably arranged in the pair of guide holes.

[0048] By providing the guide rods 12 on the pressing block 7 as described above, the reliability of part pressing is improved in the case where the piston rod stroke of the jacking cylinder 5 is relatively long.

[0049] In this embodiment, a speed reducer 14 is provided at one side position of the base 1 in the left-right direction, and the rotating shaft 10 is the output shaft of the speed reducer 14.

[0050] In this embodiment, a drive motor 15 for driving the rotation of the rotating shaft 10 is provided on the speed reducer 14.

[0051] Preferably, a lifting adjustment seat 16 is provided on the sliding table 2, the pair of upright columns 3 are vertically provided on the lifting adjustment seat 16 on the sliding table 2, and the pair of cylindrical positioning rods 8 are fixed on the lifting adjustment seat 16.

[0052] Preferably, connecting plates 17 are respectively connected between the two ends of the pair of cylindrical positioning rods 8.

[0053] Preferably, a V-shaped groove 18 for pressing the outer circle of the cast aluminum rotor 27 is provided on the lower end surface of the pressing block 7.

[0054] Preferably, a bakelite insert 19 is provided on the lower end surface of the pressing block 7, and the V-shaped groove 18 is provided on the bakelite insert 19.

[0055] As a further improvement of this embodiment, a purger 20 for cleaning after reaming the cast aluminum rotor 27 is further provided at the other side position of the base 1 in the left-right direction; the purger 20 includes a purging seat 21 fixed on the base 1, a purging pipe 23 fixed on the purging seat 21 and communicated with a compressed air pipeline 22, a sealing plate 28 is provided at the front end orifice of the purging pipe 23, and a plurality of purging holes 25 communicated with the inner hole of the purging pipe 23 are provided on a section of the outer circle at the front end of the purging pipe 23, so that a purging head 24 for purging the inner hole of the cast aluminum rotor is formed on a section of the outer circle at the front end of the purging pipe; the purging pipe 23 is coaxially arranged with the rotating shaft 10 and is respectively arranged on the left and right sides of the sliding table 2.

[0056] By providing the purger 20, automatic purging and cleaning of the inner hole after part reaming can be realized, and the cleaning efficiency is high and the cleaning quality is good.

[0057] Among them, the outer diameter of the purging head 24 is smaller than the inner hole diameter of the cast aluminum rotor 27.

[0058] Preferably, the purging holes 25 are evenly arranged at intervals on the outer circumference of a front section of the purging pipe 23.

[0059] In this embodiment, a push rod connecting block 26 is provided at the lower end of the sliding table 2, and the front end of the telescopic rod of the servo electric push rod is fixed on the push rod connecting block 26.

[0060] In this embodiment, an electric control valve (not shown in the figure) is provided on the compressed air pipeline 22.

[0061] As a further improvement of this embodiment, a center height corrector 29 for correcting the center height position of the inner hole of the cast aluminum rotor 27 before reaming is further provided on the purging device 20. The center height corrector 29 includes an upper pipe joint 30 sealed and welded at the upper position of the inner wall of a front section of the purging pipe 23, and a lower pipe joint 31 sealed and welded at the lower position of the inner wall of a front section of the purging pipe 23. An upper air flow detection hole 32 communicating with the upper pipe joint 30 is further provided at the upper position of the outer circumference of a front section of the purging pipe 23, and a lower air flow detection hole 33 communicating with the lower pipe joint 31 is further provided at the lower position of the outer circumference of a front section of the purging pipe 23. The upper pipe joint 30 and the lower pipe joint 31 are respectively connected to an upper air flow delivery pipe 34 and a lower air flow delivery pipe 35, and the upper air flow delivery pipe 34 and the lower air flow delivery pipe 35 are connected to a pneumatic gauge 37 through a three-way switching valve 36.

[0062] In this embodiment, the top pressure cylinder 5, the linear actuator (servo electric push rod) 11, the drive motor 15, the electric control valve, the three-way switching valve 36 and the pneumatic gauge 37 are automatically controlled by a controller.

[0063] The usage method of this embodiment is as follows:

[0064] (1) Workpiece installation: Position the outer circumference of the cast aluminum rotor 27 on a pair of cylindrical positioning rods 8, and then drive the top pressure cylinder 5 to act, so that the pressing block 7 at the lower end of the piston rod of the top pressure cylinder 5 presses and fixes the cast aluminum rotor 27.

[0065] (2)Center height adjustment: Actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 towards the purging head 24 side, so that the purging head 24 enters the inner hole of the cast aluminum rotor 27; Connect the compressed air pipeline 22, and spray compressed air through the purging holes 25 on the purging head 24 to pre-clean the inner hole of the cast aluminum rotor 27; After pre-cleaning, close the compressed air pipeline 22, then connect the air momentum gauge 37, and respectively detect the air flow rates of the upper air flow detection hole 33 and the lower air flow detection hole 34 through the switching of the three-way switching valve 36, and compare the air flow rates of the upper air flow detection hole 33 and the lower air flow detection hole 33. Adjust the vertical height position of the cast aluminum rotor 27 through the lifting adjustment seat 16 to make the air flow rates of the upper air flow detection hole 32 and the lower air flow detection hole 33 equal;

[0066] (3)Reaming: Start the drive motor 15 to drive the output shaft of the reduction gearbox (rotating shaft 10) and the reamer 9 to rotate together; Actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 towards the reamer 9 side, so that the reamer 9 enters the inner hole of the cast aluminum rotor 27 for reaming; After reaming to the limit position, actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 back to the initial intermediate position, and the cast aluminum rotor 27 is separated from the reamer 9, and the reaming operation is completed;

[0067] (4)Cleaning: Actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 towards the purging head 24 side, so that the purging head 24 enters the inner hole of the cast aluminum rotor 27; Connect the compressed air pipeline 22, and spray compressed air through the purging holes 25 on the purging head 24 to clean the inner hole of the cast aluminum rotor 27; After cleaning, actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 back to the initial intermediate position, and the cleaning operation of the inner hole of the cast aluminum rotor 27 is completed;

[0068] (5)Part taking: Turn off the drive motor 15 to stop the rotation of the output shaft of the reduction gearbox (rotating shaft 10) and the reamer 9; Actuate the top pressure cylinder 5 to retract the piston rod of the top pressure cylinder 5, and the pressing block 7 at the lower end of the piston rod of the top pressure cylinder 5 releases the core of the cast aluminum rotor iron 27, and the operator takes away the cast aluminum rotor 27;

[0069] (6)Circular operation: Repeat steps (1) to (4) to realize the reaming operation of the next cast aluminum rotor 27.

[0070] Preferably, in step (2), during pre-cleaning, actuate the linear drive element (servo electric push rod) 11 to move the slide table 2 reciprocally to achieve reciprocal pre-cleaning;

[0071] Preferably, in the cleaning step (4), the slide table 2 is driven by a linear actuator (servo electric push rod) 11 to reciprocate several times, so as to further improve the cleaning effect of the inner hole of the cast aluminum rotor 27.

[0072] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A reaming device for a cast aluminum rotor, characterized in that, It includes a base, a slide table movably arranged on the base in the left-right direction, a pair of columns vertically arranged at the front and rear sides of the upper end surface of the slide table, a bridge plate connected between the tops of the pair of columns, a pressing cylinder installed on the bridge plate with the piston rod facing downward, and a pressing block arranged at the lower end of the piston rod of the pressing cylinder. A pair of cylindrical positioning rods parallel to the left-right direction are spacedly arranged at the lower position of the upper end surface of the slide table below the pressing block. A rotating shaft for installing a reamer is rotatably arranged at one side position of the base in the left-right direction. A linear actuator for driving the slide table to move in the left-right direction is also arranged on the base.

2. The reaming device for a cast aluminum rotor according to claim 1, wherein The linear actuator is a servo electric push rod.

3. The reaming device for a cast aluminum rotor according to claim 1, characterized in that, A pair of guide rods are vertically arranged upward on the upper end surface of the pressing block, and a pair of guide holes are correspondingly arranged on the bridge plate. The pair of guide rods are correspondingly slidably arranged in the pair of guide holes.

4. A reaming device for a cast aluminum rotor according to claim 1, characterized in that, A speed reducer is arranged at one side position of the base in the left-right direction, and the rotating shaft is the output shaft of the speed reducer.

5. The reaming device for a cast aluminum rotor according to claim 4, wherein A driving motor for driving the rotating shaft to rotate is arranged on the speed reducer.

6. The reaming device for a cast aluminum rotor according to claim 1, wherein, A lifting adjustment seat is arranged on the slide table, the pair of columns are vertically arranged on the lifting adjustment seat on the slide table, and the pair of cylindrical positioning rods are fixed on the lifting adjustment seat.

7. A reaming device for a cast aluminum rotor according to claim 6, characterized in that, Connecting plates are respectively connected between the two end parts of the pair of cylindrical positioning rods.

8. A reaming device for a cast aluminum rotor according to claim 1, characterized in that, A V-shaped groove for pressing the outer circle of the cast aluminum rotor is arranged on the lower end surface of the pressing block.

9. A reaming device for a cast aluminum rotor according to claim 1, characterized in that, A purger for cleaning after reaming the cast aluminum rotor is also arranged at the other side position of the base in the left-right direction. The purger includes a purging seat fixed on the base, a purging pipe fixed on the purging seat and communicated with a compressed air pipeline. A sealing plate is arranged at the front end orifice of the purging pipe, and a plurality of purging holes communicated with the inner hole of the purging pipe are arranged on the outer circle of a front section of the purging pipe, so that the outer circle of a front section of the purging pipe forms a purging head for purging the inner hole of the cast aluminum rotor. The purging pipe is coaxially arranged with the rotating shaft and is respectively arranged on the left and right sides of the slide table.

10. The reaming device for a cast aluminum rotor according to claim 9, characterized in that, A center height corrector for correcting the center height position of the inner hole of the cast aluminum rotor before reaming is also arranged on the purger. The center height corrector includes an upper pipe joint sealed and welded at the upper part of the inner wall of a front section of the purging pipe, a lower pipe joint sealed and welded at the lower part of the inner wall of a front section of the purging pipe. An upper air flow detection hole communicated with the upper pipe joint is also arranged at the upper part of the outer circle of a front section of the purging pipe, and a lower air flow detection hole communicated with the lower pipe joint is also arranged at the lower part of the outer circle of a front section of the purging pipe. The upper pipe joint and the lower pipe joint are respectively correspondingly connected with an upper air flow delivery pipe and a lower air flow delivery pipe, and the upper air flow delivery pipe and the lower air flow delivery pipe are connected to a pneumatic gauge through a three-way switching valve.

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