JP4434616B2 - Dishwasher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dishwasher that cleans dishes by spraying water pressurized by a washing pump from a plurality of washing nozzles.
[0002]
[Prior art]
Conventionally, this type of dishwasher has been configured as shown in FIGS. Hereinafter, the configuration will be described.
[0003]
As shown in FIGS. 10 and 11, the water supply path 1 supplies tap water to the dishwasher main body 2, and the water supply is controlled by the water supply valve 3. The washing tank 4 is provided inside the dishwasher main body 2, and a water storage part 5 for storing the supplied water is provided inside the washing tank 4, and a water level sensor 6 communicating with the water storage part 5 is provided.
[0004]
The water stored in the water storage unit 5 is heated by the hot water heater 7 provided in the water storage unit 5 and is pressurized by the cleaning pump 8 and directed to the tableware placed in the tableware basket 10 from a plurality of cleaning nozzles 9. It is sprayed to clean the dishes. The drain pump 11 discharges the water in the cleaning tank 4.
[0005]
The dishwasher main body 2 is provided with a front door 12 that can be opened and closed so that the tableware basket 10 can be taken in and out. The leftover filter 13 captures leftovers attached to the tableware.
[0006]
The operation in the above configuration will be described. When the tableware is placed in the tableware basket 10 and accommodated in the washing tub 4 and the operation is started, the water supply valve 3 is opened and water is supplied to the washing tub 4 through the water supply path 1. The supplied water is stored in the water storage section 5 of the cleaning tank 4, and when a predetermined water level is detected by the water level sensor 6, the water supply valve 3 is closed to end the water supply, and the cleaning pump 8 is driven.
[0007]
As a result, the water stored in the water storage section 5 is heated by the hot water heater 7 and pressurized by the cleaning pump 8 and sprayed from the cleaning nozzle 9 toward the tableware in the tableware basket 10 to wash the tableware. When the cleaning is finished, the water in the cleaning tank 4 is discharged by the drain pump 11.
[0008]
In addition, as another conventional example, the basic configuration is the same as the conventional example described above, and a number of cleaning pumps corresponding to each cleaning nozzle are provided, and water is selectively injected from the cleaning nozzles, thereby reducing the operating time. There is a configuration that enables noise reduction and water saving (see, for example, Patent Document 1).
[0009]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-176875 (page 2-3, FIGS. 1 and 7)
[0010]
[Problems to be solved by the invention]
However, in such a conventional configuration, since water is simultaneously ejected from the plurality of cleaning nozzles 9, the noise is large and a large amount of water in the cleaning tank 4 is required.
[0011]
In addition, a configuration in which the number of cleaning pumps corresponding to each cleaning nozzle is provided and water is selectively ejected from the cleaning nozzle can reduce noise and save water, but providing multiple cleaning pumps is costly At the same time, there was a problem that the entire device was enlarged.
[0012]
The present invention solves the above-mentioned problem, and enables water to be selectively injected from a plurality of cleaning nozzles with a single cleaning pump, realizing low noise and water saving without increasing costs and increasing the size of the entire device. The purpose is to do.
[0013]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has a switching valve in the middle of a water channel connecting a cleaning pump and a plurality of cleaning nozzles, and the switching valve introduces water pressurized by the cleaning pump from the inlet, The water is led out to a plurality of cleaning nozzles from a plurality of outlets, and the outlet is configured to switch the outlets through which the water is led by sequentially closing the outlets by intermittently rotating the closing member in the water passage portion connecting the inlets and the outlets. The closing member has a contact surface and a notch fixed to a flat elastic material facing the outlet, and is guided by a shaft in a water passage portion that fits into a guide hole provided in the center of the closing member. A cam mechanism that reciprocates in the forward and backward direction with respect to the outlet, and rotates by a predetermined angle in one direction in conjunction with this reciprocation. Upper and lower part of the blocking member When the closing member is raised by the hydraulic power of the water pressurized by the washing pump, the contact surface to which the flat elastic material is fixed is plural Exit Have Flat Coplanar When the abutting member comes into contact with the opening surface through the elastic material and the closing member descends due to the action of gravity, the contact surface to which the flat elastic material is fixed plural The elastic member is configured so that a predetermined gap is formed with the opening surface of the outlet, and when the closing member rises and sequentially closes the outlet and switches the outlet from which water is led out in accordance with the position of the notch, the elastic member plural Mitigates the impact that occurs when abutting the opening surface of the outlet, and the closing member is raised by hydraulic power Upper By rotating the cam mechanism and guiding it at the same time plural Exit of At the end of the forward path of the reciprocating motion that is in contact with the flat opening surface, both the outlet that draws out water and the outlet that does not lead out water are both watertight by stopping the ascending and rotating motions simultaneously. It is set as the structure maintained to.
[0014]
This makes it possible to realize a switching valve with a simple configuration that has a low switching operation sound and excellent water tightness at the time of switching the outlet for deriving water, and allows a single washing pump to selectively inject water from a plurality of washing nozzles. It is possible to achieve low noise and water saving without increasing costs and increasing the size of the entire device.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
The invention according to claim 1 of the present invention has a switching valve in the middle of a water channel connecting a cleaning pump and a plurality of cleaning nozzles, and the switching valve is an inlet for introducing water pressurized by the cleaning pump. And a plurality of outlets for leading the introduced water to a plurality of cleaning nozzles, a water passage portion connecting the inlet and the outlet, and rotating intermittently within the water passage portion so as to sequentially close the outlet and fill the water. A closing member for switching the outlet to be led out, and an upper part and a lower part of the closing member Part The closing member is guided by a shaft in the water passage portion that fits into a guide hole provided at the center thereof, and reciprocates between the inlet and the outlet in the advancing and retracting direction with respect to the outlet. In contact with the reciprocating motion, the cam mechanism is configured to rotate at a predetermined angle in one direction around the shaft in the water passing portion, and a flat elastic material facing the outlet is fixed. A contact surface to which the flat elastic material is fixed when the closing member is lifted by the hydraulic force of the water pressurized by the washing pump. plural Exit Have Flat Coplanar When the closing member is lowered by the action of gravity, the contact surface to which the flat elastic material is fixed is in contact with the opening surface through the elastic material. plural The elastic member is configured so as to generate a predetermined gap with the opening surface of the outlet, and when the closing member rises and sequentially closes the outlet to switch the outlet for leading water in accordance with the position of the notch, The closure member is plural The impact generated when contacting the opening surface of the outlet is reduced, and the closing member is raised by the hydraulic force and the Upper The rotary motion by the cam mechanism is guided by the shaft and performed simultaneously. plural Exit of Both an outlet for discharging water and an outlet for not discharging water by stopping the ascending and rotating motions simultaneously at the end of the reciprocating movement abutted against the flat opening surface. The structure is designed to maintain water tightness, with a simple structure, low switching noise, and a switching valve with excellent water tightness at the time of switching the outlet for discharging water. Water can be selectively ejected from the nozzle, and noise reduction and water saving can be realized without increasing costs and increasing the size of the entire device.
[0016]
【Example】
Embodiments of the present invention will be described below with reference to the drawings. In addition, the thing of the same structure as a prior art example attaches | subjects the same code | symbol, and abbreviate | omits description.
[0017]
Example 1
As shown in FIGS. 2 and 3, the cleaning tank 4 is provided with a cleaning nozzle 14 on the left side, a cleaning nozzle 15 on the right side, and a cleaning nozzle 16 on the back side, and the cleaning nozzles 14 to 16 and the cleaning pump 8. A switching valve 17 is provided between them, and the water pressurized by the cleaning pump 8 is sequentially switched to pass through one or two of the cleaning nozzles 14-16.
[0018]
The switching valve 17 is configured as shown in FIG. 1, and the water flow section 18 leads the inlet 19 for introducing water pressurized by the washing pump 8 and the introduced water to the washing nozzles 14 to 16, respectively. The outlets 20a to 20d (see FIG. 5 for details) are connected. A closing member 21 that reciprocates between the inlet 19 and the outlets 20a to 20d and sequentially closes the outlets 20a to 20d while rotating intermittently is provided inside the water flow portion 18. In conjunction with the reciprocating motion of the closing member 21, cam mechanisms 22 and 23 that act to rotate a predetermined angle in one direction are provided on the closing member 21.
[0019]
The closing member 21 is configured as shown in FIGS. 4A to 4C, and mainly includes a notch 24 and a contact surface on which a flat elastic material 25 is fixed by bonding, two-material molding, or the like. It is comprised with the disk 26 which has. Here, the elastic member 25 constitutes an impact mitigating means for mitigating an impact generated when the closing member 21 closes the outlets 20a to 20d.
[0020]
The sliding surfaces 27 a and 27 b constitute the cam mechanism 22 on the upper surface of the disk 26, have an inclination, and are continuous on the same circumference with the approximate center of the disk 26 as an axis. The sliding surface 28 forms the cam mechanism 23 on the lower surface of the disk 26, has an inclination, and is continuous on the same circumference with the approximate center of the disk 26 as an axis. The guide hole 29 is provided substantially at the center of the disk 26.
[0021]
5 shows a cross section indicated in FIG. 1, FIG. 5 (a) is a cross section taken along line AA in FIG. 1, FIG. 5 (b) is a cross section taken along line BB in FIG. 1, and FIG. Is a cross section taken along the line CC of FIG. 1, and FIG. 5D is a cross section taken along the line DD of FIG.
[0022]
As shown in FIG. 5A, the outlet for leading water to the washing nozzles 14 to 16 is composed of four outlets 20a to 20d. The outlet 20a leads the water to the washing nozzle 14 on the left side, and the outlet 20c is on the right side. Water is led out to the washing nozzle 15, the outlet 20 d leads water to the washing nozzle 16 on the back side, and the outlet 20 b leads water to both the washing nozzles 14 and 15.
[0023]
The outlets 20a to 20d have an opening surface 30 on the same flat surface, and face the contact surface on which the flat elastic material 25 is fixed on the closing member 21, and the hole diameter D1 of the opening surface 30 is flat. It is set smaller than the outer diameter D2 of the contact surface to which the elastic member 25 is fixed. When the closing member 21 reciprocates between the inlet 19 and the outlets 20a to 20d, the contact surface to which the flat elastic member 25 is fixed contacts the opening surface 30 in a watertight manner, and the notch on the closing member 21 is cut. Any one of the outlets 20a to 20d corresponding to the position of 24 is an outlet for leading water to the washing nozzle, and the remaining three outlets 20a to 20d are blocked.
[0024]
FIG. 6 is an example showing a state in which the contact surface of the closing member 21 to which the flat elastic member 25 is fixed is in contact with the opening surface 30. In this case, the outlets 20a, 20c, and 20d are blocked. Only the outlet 20b opens as an outlet, and water is led to both the washing nozzles 14,15.
[0025]
When the movement when the closing member 21 moves upward is defined as the forward path, and the movement when the closing member 21 moves downward is defined as the backward path, the contact surface to which the flat elastic member 25 of the blocking member 21 is fixed is the opening surface at the end of the forward path. 30, but at the end of the return path, the contact surface to which the flat elastic member 25 of the closing member 21 is fixed has a predetermined gap from the opening surface 30. When the forward path and the return path are moved once each, the reciprocating motion is performed once. During this time, the cam mechanisms 22 and 23 cause the closing member 21 to move to the inside of the outlets 20a to 20d around the central axis 31 of the guide hole 29. , It is set to rotate by an angle formed by two adjacent outlets.
[0026]
Therefore, when the closing member 21 descends from the state of FIG. 6 and moves to the end of the return path, and then the closing member 21 rises and moves to the end of the outward path, the closing member 21 is formed by an angle formed by the outlet 20b and the outlet 20c. , The outlets 20a, 20b, and 20d are blocked, only the outlet 20c is opened as an outlet, and water is led out to the right washing nozzle 15.
[0027]
The reciprocating motion of the closing member 21 is mainly performed by the hydraulic force of water pressurized by the cleaning pump 8 and the gravity acting on the closing member 21 itself. Although gravity always acts on the closing member 21, the hydraulic force generated by the cleaning pump 8 is much larger than the gravity acting on the closing member 21, so that the time when the closing member 21 is subjected to hydraulic force almost ignores the effect of gravity. be able to. Therefore, the closing member 21 reciprocates by alternately operating and stopping the cleaning pump 8.
[0028]
In this way, the cleaning pump 8 repeats the operation and the stop alternately, so that the closing member 21 reciprocates between the inlet 19 and the outlets 20a to 20d, and a predetermined angle about the central axis 31 of the guide hole 29. Since it rotates, the outlets 20a to 20d are sequentially closed three at a time, and one of the outlets 20a to 20d is sequentially opened. For example, when the rotation direction of the closing member 21 is the direction shown in FIG. 6, the openings are opened in the order of 20a → 20b → 20c → 20d → 20a, and accordingly, the cleaning nozzle 14 → both cleaning nozzles 14 and 15 → cleaning. Water is sequentially led out from the nozzle 15 to the cleaning nozzle 16 to the cleaning nozzle 14. Here, it is assumed that the outlet 20b is connected to both the cleaning nozzles 14 and 15.
[0029]
Next, the cam mechanism 22 will be described. The sliding surface 27a of the closing member 21 is in sliding contact with the rib 32, which is a part of the opening surface 30 constituting the outlets 20a to 20d, and constitutes the cam mechanism 22 to convert linear motion into rotational motion. The ribs 32 extend radially from the approximate center of the opening surface 30 at substantially equal intervals.
[0030]
The closing member 21 is set at the lowered position, that is, at the end of the return path, so that the sliding surface 27a and the rib 32 overlap each other when viewed from above, and the closing member 21 is pressurized by the cleaning pump 8. When the water rises due to the hydropower of the water, the sliding surface 27a and the rib 32 come into contact with each other.
[0031]
Due to the hydraulic force, the closing member 21 receives a force upward even after contact, but for this reason, slipping occurs due to the inclination of the sliding surface 27a, and it rises while performing a rotational motion. When the rib 32 completely slides on the sliding surface 27a, the rib 32 comes into contact with the contact surface 25 made of a flat elastic material of the closing member 21, and the closing member 21 is lifted and stopped at the same time. At this time, the plurality of ribs 32 are all in contact with the contact surface of the closing member 21 to which the flat elastic member 25 is fixed without any gap, and the outlet 20 closed by the disk 26 of the closing member 21 is watertight. . In addition, if it sets so that the sliding surface 27b and the rib 32 may slidably contact, the rotation direction of the closure member 21 will be reverse.
[0032]
Next, the cam mechanism 23 will be described. FIG. 7 is a perspective view of a sliding surface 33 that forms a pair with the sliding surface 28 of the closing member 21 and constitutes the cam mechanism 23. The sliding surface 33 has an inclination and continues on the same circumference with the central axis 31 as an axis. A shaft 34 that fits into the guide hole 29 of the closing member 21 is provided at the center of the sliding surface 33.
[0033]
The cam mechanism 23 performs an operation similar to that of the cam mechanism 22, and the linear motion is converted into a rotational motion by the sliding surface 28 of the closing member 21 being in sliding contact with the sliding surface 33. That is, at the position where the closing member 21 is raised, that is, at the end of the forward path, the sliding surface 28 and the sliding surface 33 are set so as to overlap each other when viewed in plan from below. 8 When it is lowered by gravity in a state where it does not receive the hydraulic power at the time of stopping, the sliding surface 28 and the sliding surface 33 come into contact with each other. Due to the gravity, the closing member 21 receives a downward force even after the contact, but for this reason, slipping occurs due to the inclination of the sliding surface 28, and the sliding member 21 descends while performing a rotational motion.
[0034]
When the sliding surface 33 completely slides on the sliding surface 28, the lowering and rotating motions of the closing member 21 are stopped simultaneously. At this time, the contact surface on which the flat elastic member 25 of the closing member 21 is fixed and the opening surface 30 are kept stationary with a predetermined distance. And when the contact surface material 21 comprised with the next flat elastic material receives hydraulic power, and raises again, the notch 24 of the closure member 21 is an exit different from the exits 20a-20d opened previously, for example, Next to the outlet 20a coincides with the outlet 20b adjacent thereto.
[0035]
Among the reciprocating motions of the closing member 21, particularly when the closing member 21 is lifted, the movement is performed by hydraulic power. Therefore, a collision noise is generated when the closing member 21 and the opening surface 30 come into contact with each other, but the contact surface is elastic. Since it is made of the material 25, the collision is alleviated and a small collision sound is sufficient.
[0036]
Further, since the contact surface is constituted by the elastic material 25 and the outlet 20 is closed, the water tightness becomes very high, and the water tightness as the switching valve 17 can be made extremely excellent.
[0037]
Next, the overall operation in the above configuration will be described. When the tableware is placed in the tableware basket 10 and accommodated in the washing tub 4 and the operation is started, the water supply valve 3 is opened and water is supplied to the washing tub 4 through the water supply path 1. The supplied water is stored in the water storage unit 5 in the cleaning tank 4, and when a predetermined water level is detected by the water level sensor 6, the water supply valve 3 is closed to stop the water supply, and the cleaning pump 8 is driven.
[0038]
Thereby, the water stored in the water storage unit 5 is pressurized by the cleaning pump 8, passes through the switching valve 17, is sprayed from the cleaning nozzles 14 to 16 toward the tableware in the tableware basket 10, and returns to the water storage unit 5. Cycle through the path. At this time, the cleaning pump 8 operates intermittently. For example, the operation is repeatedly performed such that the operation is stopped for 5 seconds after the operation for 25 seconds. By the operation of the washing pump 8 performed intermittently, the closing member 21 constituting the switching valve 17 is intermittently subjected to hydraulic power, so that it rises and falls, that is, reciprocates together with the influence of gravity. become.
[0039]
This reciprocating motion is converted into rotational motion by the cam mechanisms 22 and 23 constituting the switching valve 17, and the closing member 21 rotates by a predetermined angle every time it reciprocates, and the water sent from the cleaning pump 8 is discharged to the outlet. Derived sequentially from 20a to 20d. Thereby, water is sequentially ejected from the cleaning nozzles 14-16. For example, if the cleaning operation is performed for a total of 30 minutes, the switching valve 17 performs the switching operation 60 times when the cleaning pump 8 is operated repeatedly for 25 seconds and then for 5 seconds. Since there are a total of four outlets 20 a to 20 d of the switching valve 17, the number of switching operations of the switching valve 17 is set to a multiple of 4 as described above 60 times, so that the entire tableware arranged in the tableware basket 10 can be used. Water can be sprayed uniformly.
[0040]
While water is circulated by the washing pump 8, it is heated by the hot water heater 7 to be heated. When the washing is finished, the water in the washing tub 4 is discharged by the drain pump 11 and the washing process is finished.
[0041]
As described above, according to the present embodiment, the switching valve 17 introduces the water pressurized by the washing pump 8 from the inlet 19, and introduces the introduced water to the plurality of washing nozzles 14 to 16 from the plurality of outlets 20a to 20d. The closing member 21 is intermittently rotated in the water passing portion 18 connecting the inlet 19 and the outlets 20a to 20d to sequentially close the outlets 20a to 20d. The closing member 21 includes the inlet 19 and the outlet 20a. The cam mechanisms 22 and 23 that reciprocate between 20d and 20d and rotate by a predetermined angle in one direction in conjunction with the reciprocating motion are provided, and the impact generated when the closing member 21 closes the outlets 20a to 20d is reduced. Since the impact mitigating means is provided, and the impact mitigating means is composed of the elastic material 25 interposed between the contact surfaces of the closing member 21 and the outlets 20a to 20d, the switching valve 17 with small switching operation sound can be realized with a simple configuration. ,Washing The pump 8 remains one, and since the water is sequentially injected from the washing nozzles 14 to 16 by the switching valve 17 having a simple structure that does not require another driving source, the cost is not increased and the entire apparatus is not enlarged. That's it.
[0042]
Further, since the switching valve 17 itself does not require a special drive source and the washing pump 8 is only operated intermittently, it can be realized at low cost, and high reliability and durability can be obtained.
[0043]
Further, the noise during operation is largely attributed to the noise that the water sprayed from the cleaning nozzles 14 to 16 hits the cleaning tank 4, so the smaller the amount of water sprayed at the same time, the quieter it is. According to this, as compared with the case where jets are simultaneously ejected from all the cleaning nozzles, the amount of water jetted simultaneously can be reduced since the jets are sequentially ejected from the respective wash nozzles, and low noise can be realized.
[0044]
In addition, the water saving is water saving because the smaller the amount of circulating water can reduce the amount of water stored in the water storage section 5, but according to the present embodiment, compared with the case where the water is injected from all the washing nozzles at the same time. Since the water is sequentially ejected from each cleaning nozzle, the amount of circulating water can be reduced and water can be saved.
[0045]
In addition, according to the present embodiment, the water supply capacity of the cleaning pump 8 can be reduced by the amount of the circulated water, and the cost of the cleaning pump 8 and the size of the cleaning pump 8 can be reduced. Thereby, the whole apparatus can be reduced in size.
[0046]
In this embodiment, the flat elastic material 25 is fixed to the closing member 21 to form the contact surface. However, the closing member 21 itself may be formed of an elastic material. Since the thickness is increased, the effect of alleviating the collision is greatly increased, and a switching valve with extremely small collision noise, that is, switching operation noise can be realized. As a result, the closing member 21 can be reduced in size, which can reduce the size of the switching valve 17 and thus the entire device.
[0047]
(Example 2)
As shown in FIG. 8, the closing member 21 is formed by fixing a flat elastic material 25 to the contact surface with the opening surface 30 by bonding, two-material molding or the like, and providing a gap 35 on the back surface of the elastic material 25. An impact mitigating means for mitigating an impact generated when the closing member 21 closes the outlets 20a to 20d is configured. The gap 35 is provided to face the rib 32 which is a part of the opening surface 30 constituting the outlets 20a to 20d. Other configurations are the same as those of the first embodiment.
[0048]
The operation in the above configuration will be described. The basic operation of the switching valve 17 and the overall operation of the dishwasher are the same as those in the first embodiment, and a description thereof will be omitted.
[0049]
Among the reciprocating motions of the closing member 21, particularly when the closing member 21 is lifted, a hydraulic power is generated. When the closing member 21 and the outlets 20 a to 20 d come into contact with each other, a collision noise is generated. Since the air gap 35 is provided on the back surface of the elastic material 25, the air gap 35 acts as a relaxation material, and the effect of mitigating the collision is greatly increased by the synergistic effect with the elastic material 25. It is possible to realize the switching valve 17 having a very small operating sound. As a result, the closing member 21 can be reduced in size, which can reduce the size of the switching valve 17 and thus the entire device.
[0050]
As described above, according to the present embodiment, the gap 35 is provided on the back surface of the elastic body 25 interposed between the contact surfaces of the closing member 21 and the outlets 20a to 20d, and the closing member 21 closes the outlets 20a to 20d. Since the impact mitigating means for mitigating the generated impact is configured, the air gap 35 acts as a mitigating material, so that the switching valve 17 with a smaller switching operation sound can be realized by a synergistic effect with the elastic material 25.
[0051]
(Example 3)
As shown in FIG. 9, the compressible spring members 36 and 37 are provided on the outlet side of the closing member 21 at a portion where the closing member 21 does not contact the opening surface 30 constituting the outlets 20 a to 20 d. Constitutes an impact mitigating means for mitigating an impact generated when the outlets 20a to 20d are closed. Other configurations are the same as those of the first embodiment.
[0052]
The operation in the above configuration will be described. The basic operation of the switching valve 17 and the overall operation of the dishwasher are the same as those in the first embodiment, and a description thereof will be omitted.
[0053]
Among the reciprocating motions of the closing member 21, particularly when the closing member 21 is lifted, a hydraulic power is generated. When the closing member 21 and the outlets 20 a to 20 d come into contact with each other, a collision noise is generated, but on the outlet side of the closing member 21, Since the compressible spring members 36 and 37 are provided in the portion where the closing member 21 does not contact the opening surface 30 constituting the outlets 20a to 20d, the effect of mitigating the collision becomes very large, and the collision sound, that is, the switching operation. The switching valve 17 with extremely low sound can be realized.
[0054]
In this case, it should be noted that the spring members 36 and 37 are arranged so that a force that uniformly pushes down the entire closing member 21 acts. When an uneven force is applied to the closing member 21, a biased force is applied to the closing member 21. Since the closing member 21 reciprocates by guiding the fitting between the guide hole 29 and the shaft 34 in the water passage 18, if the center of gravity of the closing member 21 is biased, the closing member 21 remains inclined. The reciprocating motion occurs, and the sliding surfaces 27a and the ribs 32, or the sliding surfaces 28 and the sliding surfaces 33 do not mesh well, and the cam mechanisms 22 and 23 may not function normally.
[0055]
That is, if the reciprocating motion is performed while the closing member 21 is tilted, the cam mechanisms 22 and 23 do not function well, the linear motion cannot be converted into the rotational motion, and the outlets 20a to 20d cannot be sequentially closed. The operation as the switching valve 17 becomes unstable. Further, if the reciprocating motion is performed while the closing member 21 is tilted, the contact between the guide hole 29 and the shaft 34 becomes non-uniform, and the wear may be remarkably promoted locally.
[0056]
Therefore, by applying a uniform force to the closing member 21, the inclination of the closing member 21 during the reciprocating motion is reduced as much as possible, and the cam mechanisms 22 and 23 always function normally. That is, the rectilinear movement of the closing member 21 is always accurately converted into a rotational movement, and the outlets 20a to 20d are sequentially closed, and the operation as the switching valve 17 becomes extremely stable.
[0057]
As another effect brought about by the spring members 36 and 37, the time required for the reciprocating motion of the closing member 21 can be shortened.
[0058]
Among the reciprocating motions of the closing member 21, particularly when the closing member 21 is lowered, the movement is performed by gravity. By providing the spring members 36 and 37, the closing member 21 is quickly lowered, and accordingly the lowering time is shortened. In addition, the time required for one reciprocating motion can be shortened.
[0059]
As described above, the compressible spring members 36 and 37 are provided on the exit side of the closing member 21 at the portion where the closing member 21 does not contact the opening surface 30 constituting the outlets 20a to 20d. Since the impact reducing means for reducing the impact generated when the closing member 21 closes the outlets 20a to 20d is configured, the switching valve 17 having excellent reliability and durability and small switching operation sound can be realized.
[0060]
【The invention's effect】
As described above, according to the first aspect of the present invention, the switching valve is provided in the middle of the water channel connecting the cleaning pump and the plurality of cleaning nozzles, and the switching valve is pressurized by the cleaning pump. An inlet for introducing the introduced water, a plurality of outlets for leading the introduced water to a plurality of cleaning nozzles, a water passing portion connecting the inlet and the outlet, and the outlet rotating intermittently within the water passing portion A closing member for sequentially switching the outlet through which water is led out, and an upper portion and a lower portion of the closing member. Part The closing member is guided by a shaft in the water passage portion that fits into a guide hole provided at the center thereof, and reciprocates between the inlet and the outlet in the advancing and retracting direction with respect to the outlet. In contact with the reciprocating motion, the cam mechanism is configured to rotate at a predetermined angle in one direction around the shaft in the water passing portion, and a flat elastic material facing the outlet is fixed. A contact surface to which the flat elastic material is fixed when the closing member is lifted by the hydraulic force of the water pressurized by the washing pump. plural Exit Have Flat Coplanar When the closing member is lowered by the action of gravity, the contact surface to which the flat elastic material is fixed is in contact with the opening surface through the elastic material. plural The elastic member is configured so as to generate a predetermined gap with the opening surface of the outlet, and when the closing member rises and sequentially closes the outlet to switch the outlet for leading water in accordance with the position of the notch, The closure member is plural The impact generated when contacting the opening surface of the outlet is reduced, and the closing member is raised by the hydraulic force and the Upper The rotary motion by the cam mechanism is guided by the shaft and performed simultaneously. plural Exit of Both an outlet for discharging water and an outlet for not discharging water by stopping the ascending and rotating motions simultaneously at the end of the reciprocating movement abutted against the flat opening surface. Since the closing member is reciprocated by intermittent operation of the cleaning pump, the reciprocating motion is rotated by a predetermined angle by a cam mechanism provided on the closing member. In addition, by providing a switching valve with low switching operation sound and excellent water tightness at the time of switching the outlet for deriving water, water can be selectively injected from a plurality of cleaning nozzles with one cleaning pump, Noise reduction and water saving can be achieved without increasing costs or increasing the overall size of the device.
[Brief description of the drawings]
FIG. 1 is a sectional view of a switching valve of a dishwasher according to a first embodiment of the present invention.
[Figure 2] Cross section of the dishwasher
FIG. 3 is a side sectional view of the dishwasher.
FIG. 4A is a side view of a closing member of a switching valve of the dishwasher.
(B) Upper perspective view of the closing member of the switching valve of the dishwasher
(C) Lower perspective view of the closing member of the switching valve of the dishwasher
[FIG. 5] (a) AA line sectional view of the dishwasher
(B) BB sectional view of the same dishwasher
(C) CC sectional view of the dishwasher
(D) DD line sectional view of the dishwasher
FIG. 6 is a plan view showing a state in which the closing member and the opening surface of the dishwasher are in contact with each other.
FIG. 7 is a perspective view of a sliding surface constituting the cam mechanism of the dishwasher.
FIG. 8 is a sectional view of a switching valve of a dishwasher according to a second embodiment of the present invention.
FIG. 9 is a sectional view of a switching valve of a dishwasher according to a third embodiment of the present invention.
FIG. 10 is a sectional view of a conventional dishwasher
FIG. 11 is a side sectional view of a conventional dishwasher.
[Explanation of symbols]
8 Washing pump
14 Cleaning nozzle
15 Cleaning nozzle
16 Cleaning nozzle
17 Switching valve
18 Water passage
19 entrance
20 Exit
21 Blocking member
22 Cam mechanism
23 Cam mechanism
25 Elastic material (elastic body)

Claims (1)

Having a switching valve in the middle of the water channel connecting the cleaning pump and the plurality of cleaning nozzles,
The switching valve includes an inlet that introduces water pressurized by the washing pump, a plurality of outlets that lead the introduced water to a plurality of washing nozzles, a water passage that connects the inlet and the outlet, and the passage. comprising a closing member which intermittently rotates in the water portion switches the outlet of deriving sequentially closed by water said outlet, and a cam mechanism provided in the upper and lower portions of the closure member,
The closing member is guided by a shaft in the water passage portion that fits into a guide hole provided at the center thereof, and reciprocates between the inlet and the outlet in the advancing and retracting direction with respect to the outlet, and interlocked with the reciprocating motion. The cam mechanism is configured to rotate by a predetermined angle in one direction around the shaft in the water flow portion, and has a contact surface and a notch fixed to a flat elastic material facing the outlet. ,
When the closing member is lifted by the hydraulic force of the water pressurized by the washing pump, the contact surface to which the flat elastic material is fixed has an opening surface on the same flat surface that the plurality of outlets have and the elastic material And when the blocking member descends due to the action of gravity, the contact surface to which the flat elastic material is fixed forms a predetermined gap with the opening surfaces of the plurality of outlets.
When the closing member rises and sequentially closes the outlets and switches the outlet for drawing water in accordance with the position of the notches, the elastic member makes contact with the opening surfaces of the plurality of outlets. And the closing member is lifted by the hydraulic force and rotated by the upper cam mechanism while being guided by the shaft at the same time so as to contact the flat opening surfaces of the plurality of outlets. A structure in which both the outlet for leading out water and the outlet for not leading out water are kept water-tight by the closing member simultaneously stopping the ascending and rotating movements at the end of the abutting forward path of the reciprocating motion. A dishwasher.

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