KR20010037084A - the device for decreasing vibration in a drum washer - Google Patents

Abstract

PURPOSE: A vibration reduction device uses discharged water as a weight instead of iron or concrete to reduce manufacturing cost. CONSTITUTION: A vibration reduction device comprises a main dewatering channel(100), a dewatering pump(120), an auxiliary dewatering channel(140), a balance tank(150), a drainage channel(200), a main check valve(320), a drainage pump(220) and a communicating pipe(350). The main dewatering channel(100) communicates with the lower end of an outer tank(11) to discharge water in an inner tank(12) to outside. The dewatering pump(120) is installed on the main dewatering channel(100) to give normal rotative force to make the water drained smoothly. The auxiliary dewatering channel(140) communicates with the main dewatering channel(100) to be impressed with part of water discharged from the dewatering pump(120). The balance tank(150) is installed on the auxiliary dewatering channel(140) and has an inlet(151) impressed with water from the auxiliary dewatering channel(140) and an outlet(152) discharging water to the auxiliary dewatering channel(140) on drainage to store water to act as a weight to restrain the outer tank(11) from vibrating. The drainage channel(200) communicates with the main dewatering channel(100) placed between the outer tank(11) and the dewatering pump(120) and the auxiliary dewatering channel(140) to discharge all the water in the inner tank(12) and the balance tank(150) to outside. The main check valve(320) is opened and closed by the pressure difference between the main dewatering channel(100) and the drainage channel(200). The drainage pump(220) is installed on the drainage channel(200) to give reverse rotative force to make the water smoothly drained.

Description

The device for decreasing vibration in a drum washer

The present invention relates to a drum washing machine, and more particularly to a vibration reduction device of the drum washing machine.

1 and 2, the drum washing machine includes a main body 10, an outer tub 11 supported by a damper 41 and a spring 40 in the main tub, and laundry when placed in the outer tub. It is largely divided into a cylindrical inner tub 12 that can be put, the driving force is transmitted by the driving means for washing the laundry in the inner tub.

The driving means is connected to the pulley 33 installed on the shaft of the inner rear of the inner tank and the motor 30 mounted on one side of the outer tank by the belt 32 to the power of the motor 30 to the inner shaft 34 ) Is configured to deliver.

On the other hand, the drum washing machine can not only reduce the overall height compared to the pulsator washing machine that rotates in the state in which the inner tank (12) is standing, but also increase the washing capacity, and the demand is rarely generated since problems such as poking. There is an increasing trend.

The drum washing machine configured as described above performs the following operation.

Put the laundry to be washed into the inner tank 12, when the washing mode provided in the control unit in the detergent container is put in the washing state, the washing stroke ▶ rinsing stroke ▶ dehydration stroke is made continuously and the washing is completed.

That is, when the washing mode is selected, the water supply means is operated to supply water to be washed into the inner tank 12 which is rotatably installed in the outer tank 11, and the water supply is stopped after the supplied water is filled by the appropriate level. At the same time, the motor 30 repeatedly performs forward and reverse driving.

When the motor 30 performs forward and reverse driving in this way, the driving force of the motor 30 is decelerated by the deceleration means and applied to the inner tank 12, and the inner tank 12 receiving the driving force is forward and reverse rotation. Due to the water flow generated, the laundry rubs with the water stream and the inner tank 12, and is decomposed by the detergent and washed.

After the washing stroke is completed, the rinsing is performed while going through the same process as the washing stroke, and after the rinsing stroke is completed, a dehydration stroke is performed immediately. After completely draining the filled water, the driving means is driven, and the driving force of the driving means is transmitted to the inner tank 12 as it is not decelerated, so that the inner tank 12 is rotated at a high speed so As water escapes, dehydration is carried out.

However, in the dehydration process, the drum washing machine is a horizontal washing machine, and thus, the drum washing machine is very sensitive to vibration compared to a vertical washing machine which is a pulsator washing machine.

For this reason, the drum washing machine, which is a horizontal washing machine, is relatively disposed because the inner tank 12 is laid horizontally, and the drain pump 31 and the motor 30 provided in the outer tank 11 are located at the rear side when dewatering. This is because a large vibration can be generated because the weight of the front portion of the outer tub 11 is less.

And when dehydration of the laundry in the inner tank 12 is incorrectly seated causing the eccentricity when the inner tank 12 is rotated, the outer tank 11 located in the front portion of the main body is directly received the vibration of the inner tank 12 is a large ellipse Rotate while drawing.

That is, vibration occurs when washing and dehydrating the inner tub 12 while rotating, and when the vibration is directly transmitted to the outer tub 11 without being reduced, the vibration coincides with the natural frequency of the outer tub 11. do.

As a result, as shown in FIG. 2 to reduce this phenomenon, the following vibration reduction device was used together.

The first vibration reduction device, by connecting the lower left and right outer peripheral surface of the outer tank 11 and the left and right of the lower surface of the main body 10 with a pair of dampers 41, respectively, vibration generated by the rotation of the inner tank 12 The vertical vibration is configured to be reduced by the dampers 41, respectively.

Second vibration reduction device, the upper side of the outer periphery of the outer tank 11 and the upper surface of the main body 10 is connected to a plurality of support springs (40) by the vibration generated by the rotation of the inner tank 12 damper ( 41) is configured to restore the amount of displacement change absorbed.

Third, the vibration reduction device increases the weight of the outer tub 11 to reduce the natural frequency of the outer tub 11 so that the natural frequency of the tub 11 and the inner tub ( The frequency generated in 12) is equalized.

Therefore, when the inner tank 12 is about to rotate when dewatering, the frequency is already the same, and while the dehydration is in progress, the natural frequency of the outer tank 11 and the frequency generated in the inner tank 12 do not coincide with each other. Can be prevented beforehand.

That is, by installing the weight 42 of cast iron or concrete on the upper surface and the lower surface of the outer tub 11 not only increased the weight of the outer tub 11, but also the motor 30 mounted on the outer tub 11 And so as to correspond to the weight of the drain pump 31 is balanced.

However, the vibration reduction device using the weight has the following problems.

In order to reduce vibration, cast iron or concrete is used to increase the cost, and thus the weight of the product increases, which causes transportation problems.

In order to cope with the weight, the strength of other related parts must also be reinforced, which causes a cost increase.

The present invention has been made to solve the problems of the prior art, to reduce the weight when transporting the product and to reduce the product cost, vibration reduction device using the wash water instead of the existing weight cast iron or concrete Its purpose is to develop it.

1 is a perspective view showing the configuration of a general drum washing machine.

Figure 2 is a block diagram showing the configuration of a vibration washing device of the drum washing machine according to the prior art.

Figure 3 is a block diagram showing the configuration of a vibration washing device of the drum washing machine according to the present invention.

Figure 4 is a schematic diagram showing the flow of water during dehydration in the vibration reducing device according to the present invention.

Figure 5 is a detail view of the "A" part of Figure 4 showing the operating state of the main check valve when dewatering in the vibration reducing device according to the present invention.

Figure 6 is a schematic diagram showing the flow of water at the time of drainage in the vibration reducing device according to the present invention.

Figure 7 is a detail view "A" part of Figure 6 showing the operating state of the main check valve when draining in the vibration reducing device according to the present invention.

Figure 8 is a perspective view showing the operating state of the auxiliary check valve during dehydration in the vibration reducing device according to the present invention.

Figure 9 is a perspective view showing the operating state of the auxiliary check valve during drainage in the vibration reducing device according to the present invention.

Figure 10 is an embodiment showing the configuration of the dewatering pump in the vibration reducing device according to the present invention and the flow of water when dewatering.

Figure 11 is an embodiment showing the configuration of the drain pump and the flow of water when draining in the vibration reducing device according to the present invention.

12 is a schematic view showing a state in which the dehydration pump and the drain pump are integrally formed in the vibration reducing device according to the present invention.

Explanation of symbols for main parts of the drawings

100: main dehydration flow path 120: dehydration pump

140: auxiliary dehydration path 150: balance tank

151: balance tank inlet 152: balance tank outlet

200: drainage flow path 220: drainage pump

320: main check valve 321: connector

322: hall 323: ball

324: support plate 330: auxiliary check valve

331: connector 332: first hole

333: second hole 334: plug

340: discharge hose 350: through-hole

400: barrier

The present invention for achieving the above object relates to a drum washing machine,

A main dehydration passage communicating with the lower end of the outer tank to drain the water in the inner tank, a dehydration pump installed on the main dehydration passage and applying a forward rotational force to smoothly drain the water, and a part of the water discharged from the dehydration pump An auxiliary dehydration passage connected to the main dehydration passage so as to receive the inlet, and an inlet and a drain installed on the auxiliary dehydration passage and receiving water from the auxiliary dehydration passage and exiting the water outlet to the auxiliary dehydration passage again. It is composed of a balance tank that serves as a weight to store the water to suppress the vibration of the outer tank.

And a drainage passage communicating with the main dehydration passage located between the outer tank and the dehydration pump and communicating with the auxiliary dehydration passage to drain all the water of the inner tank and the balance tank to the outside, and the drainage passage and the main dehydration passage. A main check valve installed at a connection part and opened and closed by a pressure difference between the main dehydration flow path and the drain flow path, and a drain pump installed on the drain flow path and applying a reverse rotation force to smoothly drain the water.

In order to smoothly flow the water in the balance tank, an end of the external air passing through the balance tank communicates with the balance tank, and the other end of the drum washing machine is configured to reduce the vibration of the drum washing machine. Installed and provided on.

Referring to the drawings to describe the above content in more detail as follows.

Figure 3 is a block diagram showing the configuration of the vibration reducing device of the drum washing machine according to the present invention, Figure 4 is a schematic diagram showing the flow of water during dehydration in the vibration reducing device according to the present invention, Figure 5 is a vibration reduction according to the present invention Part ″ A ″ of FIG. 4 is a detailed view showing the operating state of the main check valve during dehydration in the apparatus, and FIG. 6 is a schematic diagram showing the flow of water in drainage in the vibration reducing device according to the present invention, and FIG. 6A is a detailed view of part ″ A ″ in FIG. 6 showing the operating state of the main check valve in the vibration reducing device.

8 is a perspective view showing the operating state of the auxiliary check valve when dewatering in the vibration reducing device according to the present invention, Figure 9 is a perspective view showing the operating state of the auxiliary check valve when draining in the vibration reducing device according to the present invention.

And Figure 10 is an embodiment showing the configuration of the dewatering pump and the flow of water when dewatering in the vibration reducing device according to the present invention, Figure 11 shows the configuration of the drain pump and the flow of water when draining in the vibration reducing device according to the present invention In one embodiment, Figure 12 is a schematic diagram showing a state in which the dehydration pump and the drainage pump is integrated in the vibration reduction device according to the present invention.

As shown in FIG. 3, the configuration will be described in more detail as follows.

The main body 10 forming the outer shape, the outer tank 11 supported by the main body 10, the inner tank 12 located in the outer tank 11 to directly wash laundry, and the inner tank 12 In the drum washing machine comprising a motor 30 for applying a driving force,

In order to reduce the vibration of the outer tub 11 generated when the inner tub 12 rotates using weighted concrete or washing water instead of the cast iron 42,

The main dehydration flow path 100 communicated with the lower end of the outer tank 11 so as to drain the water in the inner tank 12 to the outside, and the main dehydration flow path 100 is installed on the main dehydration path 100 so as to smoothly drain the water. The dehydration pump 120 and the auxiliary dehydration channel 140 connected to the main dehydration channel 100 so as to receive a portion of the water discharged from the dewatering pump 120 are applied to the auxiliary dehydration tank 140. It is installed in the inlet 151 receives water from the auxiliary dehydration passage 140 and has an outlet 152 for discharging the water back to the auxiliary dehydration passage when the drainage, the water is stored in the outer tank (11) It is composed of a balance tank 150 that serves as a weight to suppress vibration.

In addition, the main dehydration passage (100) located between the outer tank (11) and the dehydration pump (120) is in communication with the auxiliary dehydration passage (140), and the water in the inner tank (12) and the balance tank (150) The drainage flow path 200 for draining all of the outside and the drainage flow path 200 and the main dehydration flow path 100 is installed in the connection by the pressure difference between the main dehydration flow path 100 and the drainage flow path 200 The main check valve 320 is opened and closed, and the drain pump 220 is installed on the drain passage 200 to apply a reverse rotation force to smoothly drain the water.

In order to smoothly flow the water in the balance tank 150, the outside air passes through the balance tank 150 to communicate with the balance tank 150, and the other end communicates with the detergent container 20. Vibration reducing device of the drum washing machine consisting of a through-pipe 350 is provided is provided in the outer tank (11).

In order to explain in more detail by dividing the operation state of the vibration reducing device of the drum washing machine configured as described above in the dehydration and drainage, the main dehydration channel 100, the auxiliary dehydration channel 140 and the drain channel 200 More specifically, it is as follows.

The main dehydration passage 100 includes a first main dehydration pipe 110 connecting the lower end of the outer tank 11 and the dehydration pump 120, and a second main dehydration pipe connecting the dehydration pump 120 to the outside. It consists of 130.

The auxiliary dehydration passage 140 may include a first auxiliary dehydration pipe 141 connecting one portion of the second main dehydration pipe 130 to the inlet 151 of the balance tank, and an outlet of the balance tank ( 152 and a second auxiliary dewatering pipe 142 connecting the drain flow channel 200 located before the drain pump 220.

The drain passage 200 may include a first drain pipe connecting one portion of the first main dewatering pipe 110 and the drain pump 220, and a second drain pipe connecting the drain pump 220 to the outside. It consists of.

The operation state of the vibration reducing device of the drum washing machine configured as described above will be described in more detail by dividing into dehydration and drainage.

First, as shown in Figures 4, 5, 8, 10, during dehydration, water accumulated in the inner tank 12 is the first main dehydration pipe 110 by the forward rotational force of the dewatering pump 120 ) Is introduced into the dehydration pump 120, and the water is discharged to the second main dehydration pipe 130 by the continuous rotational force of the dehydration pump 120.

A part of the water discharged to the second main dewatering pipe 130 is discharged to the outside, a part of the water is introduced into the first auxiliary dewatering pipe 141 and the balance tank 150 through the inlet 151 of the balance tank The water flows into the balance tank 150 by gravity, and flows into the second auxiliary dehydration pipe 142 through the outlet 151 of the balance tank.

The water introduced into the second auxiliary dewatering pipe 142 is introduced into the drainage flow path 200, and fills the drainage flow path 200 only to an appropriate line by the water level difference due to gravity, in which case the first main dewatering pipe 110 is used. The main check valve 320 provided at the connecting portion of the first main dehydration pipe 110 and the drain passage 200 is closed to prevent water from flowing back.

When the drain flow path 200 is filled to the proper line, water is filled in the balance tank 150 by the rotational force of the dehydration pump, which is filled in the balance tank 150, and the conventional vibration reduction device is used during the dehydration time. Was to act as a weight to reduce vibration.

Second, as shown in Figure 6, 7, 9, 11, during the drainage, the water stored in the balance tank 150, the wastewater in the inner tank 12, and the drainage channel 200 filled up to the proper line ) Is introduced into the drainage pump 220 from the first drain pipe 210 by the reverse rotational force of the drainage pump 220, and discharged into the second drainpipe 230 by the continuous rotational force of the drainage pump 220. And completely drained to the outside.

However, the balance tank 150 is vacuumed due to the driving force of the dehydration pump 120 and the drain pump 220 when dehydration and drainage occurs, so that the flow of water is prevented, so as to smoothly flow the water. Air flows in or out through the through-hole 350.

When the drainage is finished, all the operations of the vibration reducing device are finished.

On the other hand, as shown in Figure 5 and 7, one embodiment of the main check valve 320 is composed of the following components.

The main check valve is a valve that opens and closes due to a pressure difference, a connecting pipe 321 connecting an end of the first drain pipe 210 and any part of the first main dewatering pipe 110, and the connecting pipe. A hole 322 formed in the inner wall of the connection pipe 321 so as to be smaller than a diameter of 321, a ball 323 provided inside the connection pipe 321 as a valve for opening and closing the hole 322, and A plurality of holes are formed to support the ball 323 and allow water to pass through when draining, and includes a support plate 324 provided on the inner wall of the connection pipe 321.

The operation principle of the main check valve 320 made as described above is divided into dewatering and draining and described in more detail as follows.

First, the operation principle of the main check valve during dehydration, as shown in Figure 5, the pressure of the first main dehydration pipe 110 when the laundry of the inner tank 12 is dewatering the rotational force of the dewatering pump 120 Since the pressure is smaller than the pressure of the first drain pipe 210, the ball 323 seals the hole 322 formed in the connection pipe 321 to flow the water only to the first main dehydration pipe 110 This will occur.

Second, the operation principle of the main check valve at the time of drainage, as shown in Figure 7, the pressure of the first main dewatering pipe 110 is the pressure of the first drain pipe 210 by the rotational force of the drain pump 220 Smaller, the ball 323 is separated from the hole 322 formed in the connection pipe 321 and seated in the support plate 324, so that the water of the water to the first drain pipe 210 through the hole 322. Flow occurs.

On the other hand, in order to implement the vibration reducing device more preferably, the auxiliary check valve 330 is further provided on the end of the second main dehydration pipe 130 and the second drain pipe 230, and the auxiliary check valve It further comprises a discharge hose 340 further installed to connect to the outside.

Therefore, as shown in Figures 8 and 9, one embodiment of the auxiliary check valve 330 is composed of the following components.

The auxiliary check valve 330 is a valve that opens and closes due to a pressure difference, and a connecting pipe connecting the end portions of the second main dehydration pipe 130 and the second drain pipe 230 and the discharge hose 340 to each other ( 331, a first hole 332 formed in an inner wall of the connection pipe 331 and having a diameter similar to that of the second main dehydration pipe 130, and a second drain pipe formed in an inner wall of the connection pipe 331. The second hole 333 having a diameter similar to the diameter of the 230 and the connecting pipe 331 is rotatably provided, so that the pressure difference, only the first hole 332 when dewatering to open the drainage It consists of a stopper 334 dumbbell-shaped so that only two holes 333 can be opened.

The operation principle of the auxiliary check valve 330 made as described above is divided into dewatering and draining and described in more detail as follows.

First, the operation principle of the auxiliary check valve during dehydration, as shown in Figure 8, the discharge hose 340, the pressure of the second main dehydration pipe 130 is exposed to the outside by the rotational force of the dewatering pump 120 Since it is greater than the pressure of), the stopper 334 located in the first hole 332 of the plug 334 sealing the first hole 332 and the second hole 333 is opened to the flow of water Generated, and the stopper 334 located in the second hole 333 remains closed due to the pressure of the water flowing into the first hole 332.

Second, the operation principle of the auxiliary check valve at the time of drainage, as shown in Figure 9, the pressure of the second drain pipe 230 of the discharge hose 340 exposed to the outside by the rotational force of the drain pump 220 Since the pressure is greater than the pressure, the stopper 334 located in the second hole 333 of the plug 334 sealing the first hole 332 and the second hole 333 is opened to open the second hole ( Water flows through 333 and the stopper 334 of the first hole 332 remains closed due to the pressure of the water flowing into the second hole 333.

On the other hand, as shown in Figure 10, one embodiment of the dewatering pump 120 is composed of the following components.

An impeller 121 that rotates to suck and discharge water, a casing 122 for guiding the water sucked by the impeller 121, and a casing 122 to be positioned at a center side of the impeller 121. And a discharge port 124 formed along the tangent of the casing 122 and connected to the first main dehydration pipe 110 and connected to the second main dehydration pipe 130. .

The dewatering pump made as described above operates only during dehydration, and its operation principle is as follows.

The water of the inner tank 12 is introduced into the casing 122 through the first main dewatering pipe 110 by the rotational force of the impeller 121, and the casing () by the rotational force of the impeller 121 is continued. The water introduced into the 122 is discharged to the second main dehydration pipe 130 along the discharge port 124.

And as shown in Figure 11, one embodiment of the drain pump 220 is composed of the following components.

An impeller 221 which rotates to suck and discharge water, a cylindrical casing 222 for guiding the water sucked by the impeller 221, and a tangential line between the casing 222 and the first drain pipe; And a discharge port 224 formed along a tangent of the casing and connected to the second drain pipe 230.

The drainage pump made as described above operates only at the time of drainage, and its operation principle is as follows.

By the rotational force of the impeller 221, water in the inner tank 12 passes through the first main dehydration pipe 110, the main check valve 320 and the first drain pipe 210, the casing 222 The water of the balance tank 150 is introduced into the casing 222 via the second auxiliary dehydration pipe 142 and the first drain pipe 210, and the water flows into the casing 222. As soon as it flows in, it is discharged to the second drain pipe 230 along the discharge port 234 by the rotating force of the impeller 221 which continues.

In addition, since the dehydration pump 120 or the drain pump 220 is operated according to the driving direction of one pump motor 310, the dehydration pump 120 and the drain pump 220 are installed in a line with the shaft.

Therefore, in order to block the flow of water through the interface between the dehydration pump 120 and the drain pump 220, it will be preferable to install a barrier film 400 on the interface as shown in FIG.

On the other hand, as shown in Figure 3, 4, 5, one embodiment of the through-hole 350 is connected as follows.

The detergent container by the through-hole pipe 350 by interconnecting a hole (not shown) and a known detergent container 20 to the through-hole tube 350 so that the pipe can be connected to at least one portion of the balance tank 150. It is configured to allow smooth drainage during dehydration and drainage by allowing air to flow in or out of the balance water tank 150 from the outside.

Although not described in the above description, it can be seen that the embodiments of the check valve and the drain pump which can be implemented by the present invention are various.

In the auxiliary check valve, the second embodiment is provided between the first hole and the second hole formed in the connecting pipe so that one stopper can be rotated instead of the pair of stoppers of the two pairs. The first hole is opened to block the second hole, and the second hole is opened to close the first hole when draining.

As described above, the present invention can significantly reduce the cost of the parts compared to the prior art because it performs a weight weight role by using the water that is washed and discarded instead of the iron or concrete of the prior art in order to reduce the vibration generated during dehydration. have.

In addition, since the balance tank is filled with water only during dehydration, the weight of the balance tank can be reduced to facilitate transportation.

In addition, since a design for reinforcing product strength is not required, additional cost reduction of the product can be expected.

Claims (5)

A main dewatering flow passage communicating with the lower end of the outer tank to drain the water in the inner tank to the outside; A dewatering pump installed on the main dehydration passage and applying a forward rotational force to smoothly drain the water; An auxiliary dehydration channel communicating with the main dehydration channel to receive a portion of the water discharged from the dewatering pump; It is installed on the auxiliary dehydration channel, and has an inlet receiving water from the auxiliary dehydration channel and an outlet for discharging the water back to the auxiliary dehydration channel again, the weight to store the water to suppress the vibration of the outer tank Balance tank to play a role, A drain passage communicating with the main dehydration passage located between the outer tank and the dehydration pump, communicating with the auxiliary dehydration passage, for draining all of the water in the inner tank and the balance tank to the outside; A main check valve installed at a connection portion between the drain passage and the main dehydration passage, the main check valve being opened and closed by a pressure difference between the main dehydration passage and the drain passage; A drain pump installed on the drain passage and applying a reverse rotation force to smoothly drain the water; Vibration of the drum washing machine, characterized in that the one end is in communication with the balance tank and the other end is a through-hole connected to the detergent tank so that the outside air flows into the balance tank in order to smoothly flow the water in the balance tank. Abatement system. The method of claim 1, An auxiliary check valve integrally formed at an end of the main dehydration passage and an end of the drain passage, and opened and closed by a pressure difference between the main dehydration passage and the drain passage; The other end of the auxiliary check valve that is not connected to the main dehydration passage and the drainage passage further comprises a discharge hose for forming a flow path characterized in that the drum washing machine. The method according to claim 1 or 2, The auxiliary check valve A connecting pipe connecting the end portion of the main dehydration passage and the drain passage with the discharge hose; A first hole formed in an inner wall of the connection pipe and having a diameter similar to that of the main dehydration flow path; A second hole formed in the inner wall of the connecting pipe and having a diameter similar to that of the drain passage; The connection pipe is rotatably provided, and by the pressure difference between the main dehydration flow path and the drain flow path, comprising a stopper which can open only the first hole when dewatering and open only the second hole when draining. Vibration reduction device of the drum washing machine. The method of claim 1, The main check valve A connecting pipe connecting the main dehydration passage and the drain passage; A hole formed in an inner wall of the connector and having a diameter smaller than that of the connector; A ball provided in the connection pipe and serving as a valve to open and close the hole by a pressure difference between the main dehydration flow path and the drain flow path; The vibration reducing device of the drum washing machine, which is provided on the inner wall of the connection pipe, supports the ball when draining, and comprises a support plate having a plurality of holes formed therein to allow water to pass therethrough. The method of claim 1, And a blocking membrane is provided between the dehydration pump and the drainage pump to block the flow of water between the dehydration pump and the drainage pump.