JPH10180212A - Jetting washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep water jetting pressure at the same level irrespective or rack using conditions. SOLUTION: When a nozzle arm integrated to each rack is fitted to a circulating line 13, a switch in a rack detecting mechanism 35 is turned on. When a jet rack is loaded into the lower section, by action of a magnet 37 fitted to the rack, a lead switch 36 is turned on. A control part calculates the number of loaded racks by these detection signals, and frequency corresponding to it is set in an invertor control part for driving a pump motor. In this way, when total area of jet holes is large, the revolution of the pump motor of a circulating pump 12 is increased to increase suction.discharge force, and thereby high jetting pressure is maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a jet washing machine such as a so-called utensil washer or a dishwasher for performing washing by spraying water onto various objects to be washed contained in a washing room.

[0002]

2. Description of the Related Art An instrument washer stores a basket-shaped rack on which a test tube, a beaker, and other experimental instruments are placed in a box-shaped washing room, supplies water to the washing room, and supplies water to the bottom of the washing room. , And the water is sent out to a nozzle arm provided with a plurality of small-diameter water injection holes by a circulation pump, and water is injected from the water injection holes to clean and rinse the instruments. The water sprayed from the nozzle arm flows down to the bottom of the cleaning chamber and is circulated again by the circulation pump for use.

[0003]

There is a dishwasher of this type which can load a plurality of racks in a vertical direction so that a large number of dishes can be washed at one time. In such a multistage rack-mounted utensil washer, nozzle arms are provided for each rack, but when only a part of the racks is loaded for cleaning, unnecessary nozzle arms are also installed. In many cases, the injection of water is stopped even when the nozzle arm is mounted. For this reason, the total area of the injection holes for injecting water varies according to the loading state of the rack, and the pressure of the spray water also varies.

[0004] Further, in the utensil washing machine, utensils of various shapes such as utensils having a relatively wide opening such as beakers and flasks, utensils having a relatively narrow opening such as measuring cylinders and vials, and the like are highly washed. Since it is necessary to wash with high performance, the shape and size of the nozzle orifice are changed according to the shape of the utensil. The pressure of the injection water also varies depending on the shape and size of the injection hole of such a nozzle.

When the pressure of the injection water fluctuates as described above,
When the injection pressure is weak, water does not spread to every corner of the utensil, and even if it is splashed with water, the dirt attached to the utensil is weak, and there is a problem that sufficient cleaning performance cannot be obtained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to suppress the fluctuation of the water injection pressure even when the use condition, that is, the load condition changes,
An object of the present invention is to provide an injection type washing machine capable of preventing poor cleaning.

[0007]

According to a first aspect of the present invention, there is provided a cleaning chamber in which a rack on which an object to be cleaned is placed is accommodated in a cleaning chamber, and water collected at the bottom of the cleaning chamber is stored. In a jet type washing machine for sucking and sending out to a nozzle having a plurality of water injection holes, and jetting water from the water injection holes to an object to be cleaned for cleaning, a) the cleaning chamber is driven by the rotational driving force of a pump motor. A circulating pump that sucks water from the bottom and sends it to the nozzle; b) input means operated by a user to switch the strength of the water flow; c) rotation of the pump motor according to the setting of the input means. Drive control means for adjusting the suction / discharge force of the circulating pump by controlling the number thereof.

According to a second aspect of the present invention, a rack on which an object to be cleaned is placed is accommodated in a cleaning chamber, and a plurality of waters are suctioned from a bottom of the cleaning chamber. A jet type washing machine that sends water to a nozzle having an injection hole and injects water to the object to be cleaned from the water injection hole to perform cleaning, a) suctioning water from the bottom of the cleaning chamber by the rotational driving force of a pump motor. A) a circulating pump for sending out to the nozzles, b) a detecting means for detecting that a rack is loaded at a predetermined rack loading position, and c) controlling a rotation speed of the pump motor according to a detection result of the detecting means. And a drive control means for adjusting the suction / discharge force of the circulating pump.

Further, in the jet washing machine according to the second aspect of the present invention, the detecting means includes identification means for identifying a type of the loaded rack, and the drive control means determines whether or not the rack is present and the type of the rack. The configuration may be such that the rotation speed of the pump motor is controlled accordingly.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION In the above-mentioned first and second inventions, the injection type washing machine controls the rotation speed of a pump motor by an inverter, for example, so that the suction / discharge capacity of the circulation pump can be varied. That is, if the inverter frequency is set high, the suction / discharge power of the circulation pump increases,
Conversely, if the inverter frequency is set low, the suction / discharge force weakens.

The shape of the rack conforms to the shape of the utensil to be cleaned, and the number, size, etc., of the injection holes of the nozzles provided with the rack are also different. Therefore, when using a rack having a large number of injection holes or an injection hole having a relatively large opening area, the force of water injected from the injection holes becomes weak unless the water pressure inside the nozzles is increased.

Therefore, in the jet type washing machine according to the first aspect of the present invention, the user operates the input means so as to switch to an appropriate water flow in accordance with the number and type of racks to be loaded. The drive control means controls the pump motor in accordance with this operation so that the number of revolutions becomes predetermined for each of the water flows. That is, when a relatively strong water flow is selected, the rotation speed is set high, and when a relatively weak water flow is selected, the rotation speed is set low. Thereby, even if the shape, number, and size of the ejection holes of the nozzles of the rack are different, an appropriate water ejection pressure can be obtained.

[0013] In the jet-type washing machine according to the second aspect of the present invention, at each rack loading position where a plurality of racks can be loaded, the detecting means detects the presence or absence of the loading of the rack. Various types of detection means can be used.For example, when a rack is loaded, a switch that is pressed and closed by the rack or a member attached thereto is used, or a well-known optical means is used. Can also. The drive control means receives the detection signal from the detection means and controls the pump motor so that the number of rotations is in accordance with the number of loaded racks. That is,
When the number of loaded racks is small and the number of nozzle injection holes is small, the rotation speed is reduced. Conversely, when the number of loaded racks is large and the number of nozzle injection holes is large, the rotation speed is increased. This makes it possible to keep the momentum of the water coming out of the injection holes almost constant irrespective of the number of loaded racks.

Further, as described above, since the number and the opening area of the injection holes may differ depending on the type of the rack, not only the presence or absence of the rack but also the type of the loaded rack is detected. If this is also reflected in the rotation speed of the pump motor, the fluctuation of the injection pressure can be further suppressed.

[0015]

As described above, according to the injection type washing machine according to the first or second aspect, the injection pressure is appropriately adjusted in accordance with the number of loaded racks, the use condition of each rack, and the like. Therefore, it is possible to eliminate poor cleaning caused by low injection pressure.

According to the jet-type washing machine according to the second aspect of the present invention, since the loaded state of the rack is automatically detected and the jet pressure is adjusted accordingly, the user himself can make judgments and operations. Appropriate cleaning can be performed without performing.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, an appliance cleaning machine according to an embodiment (hereinafter referred to as "embodiment 1") of the injection cleaning machine of the first invention will be described with reference to FIGS. FIG. 1 is a side perspective view illustrating the entire configuration of the utensil washer of the first embodiment. Inside the outer box 1, a box-shaped washing room 2 is provided, and a door 3 is provided at the front opening of the washing room 2 so as to be openable and closable. In the washing room 2, a basket-like rack on which instruments are placed is an upper rack 4,
The racks 4 to 7 can be loaded at four positions of the upper middle rack 5, the middle lower rack 6, and the lower rack 7, and the loaded racks 4 to 7 can slide to the front side with the door 3 opened. I have. A water storage tank 8 is provided at the bottom of the washing chamber 2, and a filter 9 for collecting solids flowing down from instruments is detachably provided on the upper surface of the water storage tank 8.

A water level detection chamber 10 connected to the water storage tank 8 is provided with a float 11 which moves up and down according to the water level. The water storage tank 8 is connected to a suction port of a circulation pump 12, and a circulation pipe line 13 that branches into two is connected to a discharge port of the circulation pump 12. The water storage tank 8 is also connected to a suction port of a drain pump 14, and a discharge port of the drain pump 14 is connected to an external drain port 15. An overflow port 16 is provided at the bottom of the cleaning chamber 2, and the overflow port 16 is connected to a suction port of an overflow pump 17. And
The discharge port of the overflow pump 17 is also connected to the external drain port 15.

Below the racks 4 to 7, rotatable nozzle arms 18 to 21 integrated with or separate from the racks are provided.
The water is supplied through the. The upper three nozzle arms 18 to 20 are provided with jet holes for jetting water in the vertical direction, while the lowermost nozzle arm 21 is provided with jet holes for jetting water only in the upward direction. Note that a part of the injection hole is formed so as to inject water in an oblique direction.
21 rotate.

A hot water supply port 22, a water supply port 23 and a pure water port 24 for supplying hot water, tap water and pure water into the washing chamber 2 are provided on the back of the outer box 1, respectively. The cleaning chamber 2 is connected via a valve 26 and a pure water valve 27. The hot water supply port 22 and the water supply port 23 are further provided with a first detergent supply valve 28 and a second detergent supply valve 2.
9 are connected to a first detergent dispenser 30 and a second detergent dispenser 31 provided in the cleaning chamber 2, respectively. Further, a loop-shaped heater 32 for warming the accumulated water is provided at the bottom of the cleaning chamber 2, so that even when water is used, the heater 32 can be heated to enhance the cleaning effect. . Further, an exhaust port 33 for discharging water vapor to the outside is provided at an upper portion of the cleaning chamber 2.

Next, the shape of the rack mounted in the cleaning chamber 2 will be described. The racks used in the utensil washing machine are roughly classified into two types: general-purpose racks and high-precision washing racks (hereinafter, referred to as “jet racks”).
The general-purpose rack has a basket-like form, as shown in FIG. 1, water jetting from upwardly directed injection holes of a nozzle arm disposed directly below the rack, and downwardly directed nozzle nozzles disposed above the nozzle arm. The equipment housed in the rack is washed by the water jetted from the jet holes.

FIG. 2 is a top view (a) and a front view (b) showing the appearance of the jet rack. In the jet rack, the water pipes 51 are formed in a stripe shape on the bottom surface of the basket-shaped frame body 50.
Is disposed, and when the rack is loaded at a predetermined position in the cleaning chamber 2, the water supplied through the circulation piping 13 is introduced into the water pipe 51 from the water inlet 52 substantially at the center of the rear surface of the rack. Has become. An injection nozzle 53 protruding upward is formed at an appropriate position of the water pipe 51, and an elongated injection pipe 54 can be attached to the injection nozzle 53 as necessary. The instruments are the injection nozzle 53
Alternatively, the container is placed with the container opening down so as to cover the injection pipe 54. Therefore, the inside of the container is surely and strongly washed by the water jetted vigorously from the jet nozzle 53 or the jet pipe 54. The outside of the container is washed with water from the nozzle arm directly below or above the same as the general-purpose rack. In the utensil washer of this embodiment, the jet rack can be loaded only at the position of the lower rack 7, and the general-purpose rack can be loaded at any of the positions of the racks 4 to 7 in the four stages.

Next, the electrical configuration of the utensil washer of the first embodiment will be described with reference to FIG. The operation control unit 40 is mainly configured by a microcomputer, and performs various control operations related to the cleaning operation by executing a control program stored in the internal ROM in advance.
In addition to the input of a key input signal and the like from the operation unit 41, the operation control unit 40 also has a water temperature detection thermistor 42, a door switch 43 for detecting opening and closing of the door 3, and that the float 11 has reached a prescribed water level due to rising of the float 11. A detection signal is input from a prescribed water level switch 44 for detecting the overflow, a flood water level switch 45 for detecting that the water reaches the overflow water level, and the like. The operation control unit 40 outputs a display control signal to display on the display unit 46 a display for monitoring the progress of the cleaning operation, etc., as well as the hot water supply valve 25 and the water supply valve 2.
6. Outputs control signals for controlling or driving the pure water valve 27, the first detergent supply valve 28, the second detergent supply valve 29, the drain pump 14, the overflow pump 17 and the heater 32, and further outputs the circulation pump 12 A control signal for setting the frequency is output to an inverter control unit 47 that drives the pump motor of FIG.

FIG. 4 is a front view (a) showing the appearance of the utensil washer of the first embodiment and a detailed view (b) of the operation panel.
In this utensil washer, an operation unit 41 and a display unit 46 are arranged side by side at the upper part of the door 3, and an operation panel 41 a of the operation unit 41 has a push-button type power switch 411 and a rotary circulating water amount. A selection switch 412 is provided.

The processing operation of the operation controller 40 during the cleaning operation will be described with reference to the flowchart of FIG. Although an example of rinsing using tap water (without using detergent) is described here, the basic processing operation is the same when hot water or pure water is used, or when washing with detergent. is there.

First, the user loads the rack on which the utensil to be cleaned is placed at a predetermined position in the cleaning chamber 2 and, in order to make the jet pressure of water the same regardless of the use state of the rack, The intensity of the circulating water flow is selected by the circulating water amount selection switch 412 in accordance with the number of loaded water and the like. That is, each water flow selected by the circulating water amount selection switch 412 corresponds to various use conditions of the rack so that the water injection pressure is substantially the same. As a standard water flow selection method, the jet rack sprays more water than the general-purpose rack, so one jet rack is regarded as two general-purpose racks. When the number of loaded racks is 1 to 5, the circulating water amount selection switch 412 is set to the position of "weakest", "weak", "medium", "strong" or "strongest". For example, when a jet rack is loaded at the position of the lower rack 7 and general-purpose racks are loaded at the other three locations, the maximum number of racks loaded is five, and the position of the circulating water volume selection switch 412 is set to “strongest”. .

After the water flow is selected in this manner, when the start of cleaning is instructed by a key input operation on the operation section 41, the water supply valve 26 is opened, whereby tap water is supplied to the cleaning chamber 2. (Step S1). The water supplied into the cleaning chamber 2 fills the water tank 8. When the float 11 in the water level detection chamber 10 rises as the water level rises and the specified water level switch 44 is turned on (step S2), the water supply valve 26 is closed (step S3). This stops the water supply,
The cleaning chamber 2 holds an amount of water determined by a specified water level.

Next, the operation control unit 40 sets a frequency corresponding to the selected water flow in the inverter control unit 47 and starts the operation of the circulation pump 12. That is, when the "strongest" water flow is selected (step S4), the frequency is set to 60 Hz (step S5). When the "strong" water flow is selected (step S6), the frequency is set to 55 Hz (step S7). When the water flow is selected (step S8), the frequency is set to 50 Hz (step S8).
9) When the "weak" water flow is selected (step S10), the frequency is set to 45 Hz (step S11), otherwise, when the "weakest" water flow is selected, the frequency is set to 40 Hz (step S12). The circulating pump 12 is operated.

When the circulating pump 12 operates, the water in the water storage tank 8 is sucked and discharged to the circulating piping 13 with high water pressure. The water branches in the circulation pipe 13 into two parts, and reaches the respective nozzle arms 18 to 21. Then, water is jetted vigorously from the jet holes of each of the nozzle arms 18 to 21 and hits instruments and the like accommodated in each rack to remove dirt. At this time, each nozzle arm 18
21 to 21 are rotated by the force of the water jet, so that the water is jetted evenly to the instruments housed in each rack. The injected water falls to the bottom of the washing chamber 2, the solid matter is collected by the filter 9, flows into the water storage tank 8, and is sucked again by the circulation pump 12. Since the suction / discharge force of the circulating pump 12 increases as the rotation speed of the pump motor increases, the higher the frequency of the inverter control unit 47 is, the higher the water pressure in the circulation piping 13 increases, and the larger the total opening area of the injection holes becomes. A high injection pressure is maintained in any case.

After the operation of the circulation pump 12 is started, the operation control section 40 determines whether or not a predetermined cleaning operation time has elapsed (step S13). If the cleaning operation time has not elapsed, the operation returns to step S4. The setting of the circulating water amount selection switch 412 is checked again. Accordingly, even when the circulating water amount selection switch 412 is switched after the cleaning is started, the frequency is switched correspondingly, and the water pressure in the circulation piping 13 changes.

When it is determined in step S13 that the cleaning operation time has elapsed, the operation of the circulation pump 12 is stopped (step S14), while the operation of the drainage pump 14 is started (step S15). Thereby, the supply of water from the water storage tank 8 to the circulation pipe line 13 is stopped, and the injection of water from the nozzle arms 18 to 21 is stopped. Then, instead, the water sucked from the water storage tank 8 is sent out to the external drain port 15, and the water stored in the water storage tank 8 decreases.

The operation of the drain pump 14 is continued until one minute elapses after the operation of the drain pump 14 is started (step S16), and the drain pump 14 is stopped when one minute elapses (step S17). That is, the drain pump 14
With a suction / discharge performance of, a time sufficient to discharge all the water accumulated in the cleaning chamber 2 is set, and when the drainage is completed, the rinsing process is completed.

Next, one embodiment of the injection type washing machine of the second invention (hereinafter referred to as "Embodiment 2") will be described with reference to FIGS. In the second embodiment, instead of the user himself / herself selecting the water flow by operating the circulating water amount selection switch as in the first embodiment, the presence or absence of the rack is automatically determined and the water flow is switched according to the result. Like that.

FIG. 6 is a side perspective view showing the entire structure of the utensil washer of the second embodiment. The basic configuration is the same as that of the first embodiment shown in FIG. 1, but three nozzle pipe mounting ports 3 provided in a circulation pipe 13 provided at the rear of the cleaning chamber 2.
4 is provided with a rack detecting mechanism 35 for detecting whether or not a rack is loaded. Also, the lower rack 7
The rack is always loaded at the position (1).
When only the number of racks is loaded, it is determined that the rack is loaded at the bottom. However, in order to detect whether the loaded rack is a jet rack or a general-purpose rack, a reed switch 36 is provided at a predetermined position. Is provided. When the jet rack is loaded at the position of the lower rack 7, a magnet 37 is provided on the side of the jet rack facing the reed switch 36.
By detecting that the reed switch 36 is closed by the action of the magnet 37,
It is configured to detect that the loaded rack is a jet rack.

FIG. 7 is a side sectional view showing the structure of the rack detecting mechanism 35. As shown in FIG. When the rack is not loaded at a predetermined position in the cleaning chamber 2, the opening of the nozzle pipe mounting port 34 on the back of the cleaning chamber 2 is closed by the shielding plate 60 pressed by the urging force of the spring 61, and the circulation pipe 13 The inside water is prevented from flowing into the cleaning chamber 2. Also,
The distal end of the push rod 62 fixed to the shielding plate 60 is separated from the switch 63, and the switch 63 is open (see FIG. 7A).

When loading the rack integrated with the nozzle arm, the nozzle pipe 64 for sending water to the nozzle arm is pushed into the nozzle pipe mounting port 34. Then, the shielding plate 60 is pushed back by the nozzle pipe 64 and retreats.
Water flows into the nozzle pipe 64 from the circulation pipe 13 through a water passage 64 a provided on the side wall surface at the tip of the nozzle. Further, the push rod 62 pushes the switch 63 when the shielding plate 60 retreats to a predetermined position, and closes the switch 63 (see FIG. 7B). As a result, the switch 63 is turned ON.
By detecting that the rack has been loaded, it can be detected that the rack has been loaded.

FIG. 8 is an electrical configuration diagram of the utensil washer of the second embodiment. In this utensil washing machine, the upper rack detection switch 631, upper middle rack detection switch 632, middle and lower rack detection switch 633, and reed switch 36 replace the circulating water flow selection switch of the utensil washing machine of the first embodiment.
The detection signal is input from the.

Hereinafter, the processing operation of the apparatus cleaning machine of the second embodiment, centering on the operation control section 40 during the cleaning operation, will be described with reference to the flowchart of FIG. First, when the rack on which the utensil to be cleaned is placed is loaded at a predetermined position in the cleaning chamber 2 and the start of cleaning is instructed by a key input operation on the operation unit 41, the water supply valve 26 is opened, thereby Tap water is supplied to the cleaning room 2 (step S21). The water supplied into the cleaning chamber 2 fills the water tank 8. With the rise of the water level, the float 11 in the water level detection chamber 10 rises, and when the specified water level switch 44 is turned on (Step S22), the water supply valve 26 is closed (Step S23). As a result, the supply of water is stopped, and the amount of water determined by the specified water level is held in the cleaning chamber 2.

Next, the operation control unit 40 calculates the number of loaded racks according to the detection signals of the three detection switches 631 to 633 and the reed switch 36 (step S24). At this time, when the reed switch 36 is ON, the calculation is performed for two racks. And
A frequency corresponding to one of the calculated rack loading numbers 1 to 5 is set in the inverter control unit 47 and the circulation pump 1
The operation of No. 2 is started. That is, when the number of racks is 5 (step S25), the frequency is set to 60 Hz (step S26). When the number of racks is 4 (step S27), the frequency is set to 55 Hz (step S28). At some point (step S29), the frequency is set to 50 Hz (step S30).
When the number of loaded racks is two (step S31)
The frequency is set to 45 Hz (step S32), and in other cases, that is, when the number of loaded racks is 1, the frequency is set to 40 Hz (step S33), and the circulation pump 12 is operated.

When the circulating pump 12 operates, the water in the water storage tank 8 is sucked and discharged to the circulating pipe 13 with a high water pressure. The water branches in the circulation pipe 13 into two parts, and reaches the respective nozzle arms 18 to 21. Each of the loaded nozzle arms 18 to 21
The water jets vigorously from the jet holes, and strikes the instruments placed in each of the racks 4 to 7 to remove dirt. At this time, suction and circulation of the circulation pump 12 are performed according to the loading state of the rack.
Since the discharge force changes, even when the total area of the injection holes is large, the injection pressure of water is kept at an appropriate level, and high cleaning power can be obtained.

The processing operation after step S34 is the same as the operation after step S13 in FIG. 5, and a description thereof will be omitted.

The rack detecting mechanism and the mechanism for determining whether the rack is a jet rack or a general-purpose rack can be formed by various methods. For example, a switch may be provided inside the door, and the switch may be closed when the door is closed with the rack loaded.

Although the above embodiment is an example of an appliance washer, it is apparent that the present invention can be applied to, for example, a dishwasher having the same configuration. Further, the above embodiment is merely an example, and it is apparent that modifications and changes can be made as appropriate within the scope of the present invention.

[Brief description of the drawings]

FIG. 1 is a side perspective view showing the entire configuration of an appliance washer that is an embodiment of a jet-type washer according to the first invention.

FIGS. 2A and 2B are a top view and a front view, respectively, showing the appearance of a jet rack used in the utensil washer of Example 1. FIGS.

FIG. 3 is an electrical configuration diagram of the utensil washer of the first embodiment.

FIG. 4A is a front view showing the appearance of the utensil washer of the first embodiment, and FIG.

FIG. 5 is a flowchart illustrating a processing operation of an operation control unit of the utensil washer according to the first embodiment.

FIG. 6 is a side perspective view showing the entire configuration of an appliance washer which is an embodiment of the jet-type washer according to the second invention.

FIG. 7 is a side sectional view showing a rack detection mechanism of the utensil washer of the second embodiment.

FIG. 8 is an electric system configuration diagram of the utensil washer of the second embodiment.

FIG. 9 is a flowchart illustrating a processing operation of an operation control unit of the utensil washer according to the second embodiment.

[Explanation of symbols]

 2 ... Cleaning room 12 ... Circulation pump 13 ... Circulation pipeline 35 ... Rack detection mechanism 36 ... Reed switch 412 ... Circulating water amount selection switch 47 ... Inverter control unit

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mitsuru Nagana 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Tetsuo Sakane 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd.

Claims (3)

[Claims] 1. A rack on which an object to be washed is placed is housed in a washing chamber, and water collected at the bottom of the washing chamber is sucked and sent out to a nozzle having a plurality of water injection holes. A) a circulating pump that injects water from the cleaning object to perform cleaning by injecting water into the object to be cleaned; Input means operated by a user to switch the intensity; c) drive control means for adjusting the suction / discharge force of the circulating pump by controlling the rotation speed of the pump motor according to the setting of the input means. An injection type washing machine comprising: 2. A rack on which an object to be washed is placed is housed in a washing chamber, and water collected at the bottom of the washing chamber is sucked and sent out to a nozzle having a plurality of water injection holes. (A) a circulating pump for sucking water from the bottom of the washing chamber by the rotational driving force of a pump motor and sending it to a nozzle; and Detecting means for detecting that a rack is loaded at the rack loading position; c) adjusting the suction / discharge force of the circulating pump by controlling the rotation speed of a pump motor according to the detection result of the detecting means. An injection type washing machine comprising: a drive control unit. 3. The apparatus according to claim 2, wherein the detecting means includes an identifying means for identifying a type of the loaded rack, and the drive control means controls a rotation speed of the pump motor in accordance with the presence or absence of the rack and the type of the rack. The injection type washing machine according to claim 2, wherein