Piston pump, washing equipment and washing machine

Abstract

The invention relates to the technical field of washing machines, and provides a piston pump, washing equipment and a washing machine. The piston is movably arranged in the shell, a rod cavity and a rodless cavity are formed in the shell, a rod portion of the piston is located in the rod cavity, the feeding port and the discharging port are formed in the rodless cavity, the rodless cavity comprises a variable space used for being filled with liquid and an invariable space used for being filled with gas, and the ratio of the volume of the invariable space to the volume of the variable space is smaller than or equal to 15%. An output shaft of the driving piece is in transmission connection with a rod part of the piston through a transmission mechanism and can drive the piston to move in the first direction; the first one-way valve is installed at the feeding port and allows fluid to enter the rodless cavity in a one-way mode. The second one-way valve is installed at the discharging port and allows fluid to be discharged out of the rodless cavity unidirectionally. Therefore, the working efficiency of the piston pump can be improved, and the control accuracy in the material pumping process of the piston pump is improved.

Description

Technical Field

[0001] This invention relates to the field of washing machine technology, and more particularly to a piston pump, a washing device, and a washing machine. Background Technology

[0002] Automatic detergent dispensing devices used in washing machines on the market generally use piston pumps. Due to structural limitations, existing piston pumps can only be used with the inlet and outlet facing upwards. If used upside down, with the inlet and outlet facing downwards, there will be a significant reduction in the amount dispensed, which cannot meet the usage requirements. Furthermore, the liquid needs to be drawn from the bottom of the liquid storage box, which requires a flow channel adapter. This flow channel adapter not only increases the cost of the product but also increases the risk of product leakage.

[0003] Therefore, there is an urgent need for a piston pump, washing equipment, and washing machine to solve the above-mentioned technical problems. Summary of the Invention

[0004] The purpose of this invention is to provide a piston pump, a washing device, and a washing machine that can reduce the volume of the fixed space in the piston pump and achieve high operating efficiency and control precision regardless of whether the piston pump and the liquid storage box are upright or inverted.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Piston pumps, used in washing machines, include:

[0007] The housing has a piston chamber inside, and an inlet and an outlet are provided on one axial end face of the piston chamber.

[0008] A piston is placed inside a piston chamber. The piston includes a plunger portion and a rod portion connected to each other. The plunger portion forms a continuous seal with the inner peripheral wall of the piston chamber in the circumferential direction, dividing the piston chamber into a rod chamber and a rodless chamber arranged in a first direction. The rod portion is located in the rod chamber. The inlet and outlet are located in the rodless chamber. The rodless chamber includes a variable space for filling liquid and a fixed space for filling gas. The ratio of the volume of the fixed space to the volume of the variable space is less than or equal to 15%.

[0009] The drive unit, the output shaft of which is connected to the rod of the piston via a transmission mechanism, is capable of driving the piston to move along the first direction.

[0010] A first check valve is installed at the feed inlet to allow fluid to enter the rodless chamber in one direction.

[0011] A second check valve is installed at the discharge port to allow the fluid to be discharged unidirectionally from the rodless chamber.

[0012] As a preferred embodiment of the piston pump, the piston further includes a filling part, the piston plunger part is an injection molded part, and a process hole is formed on the side opposite to the rod part, and the filling part is installed in the process hole.

[0013] As a preferred technical solution of the above-mentioned piston pump, the housing includes a housing body and a one-way valve mounting component. The one-way valve mounting component is fixed to the housing body. The inlet and outlet are both provided on the one-way valve mounting component. The end face of the one-way valve mounting component facing the plunger portion is adapted to the end face of the plunger portion facing the one-way valve mounting component.

[0014] As a preferred technical solution for the aforementioned piston pump, a foolproof structure is provided between the aforementioned check valve mounting component and the aforementioned housing body.

[0015] As a preferred embodiment of the piston pump, the transmission mechanism is installed inside the housing, the output shaft of the drive member can pass through the housing and connect to the transmission mechanism, and the output shaft of the drive member and the housing form a circumferential seal.

[0016] As a preferred technical solution of the aforementioned piston pump, the aforementioned transmission mechanism is an eccentric wheel, the output shaft of the aforementioned drive component is fixed at the center of the aforementioned eccentric wheel, and the rod portion of the aforementioned piston is connected to the aforementioned eccentric wheel at an eccentric position.

[0017] As a preferred technical solution of the piston pump, the piston chamber is provided with a first limiting groove on the inner peripheral wall in the second direction. The length direction of the first limiting groove is parallel to the first direction, and the width direction is parallel to the third direction. At least part of the piston rod can be inserted into the first limiting groove and can move along the first direction within the first limiting groove. The first direction, the second direction, and the third direction are perpendicular to each other.

[0018] As a preferred technical solution of the piston pump, the piston chamber is provided with a second limiting groove on the inner peripheral wall in the third direction. The length direction of the second limiting groove is parallel to the first direction, and the width direction is parallel to the second direction. At least part of the piston rod can be inserted into the second limiting groove and can move in the second limiting groove along the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0019] A washing device is also provided, including a liquid storage tank and the aforementioned piston pump, wherein the feed port of the piston pump is capable of obtaining the fluid from the liquid storage tank.

[0020] A washing machine is also provided, including the washing device described above.

[0021] Beneficial effects of this invention:

[0022] A piston pump is provided, including a housing, a piston, a drive unit, a first check valve, and a second check valve. The housing has a piston chamber, with an inlet and an outlet on one axial end face. The piston, located within the piston chamber, includes a plunger portion and a rod portion connected to each other. The plunger portion forms a continuous circumferential seal with the inner wall of the piston chamber, dividing the piston chamber into a rod-type chamber and a rodless chamber arranged along a first direction. The rod portion is located in the rod-type chamber, while the inlet and outlet are located in the rodless chamber. The rodless chamber includes a variable space for filling liquid and a fixed space for filling gas, with the ratio of the volume of the fixed space to the volume of the variable space being less than or equal to 15%. The output shaft of the drive unit is connected to the rod portion of the piston via a transmission mechanism, enabling the piston to move along the first direction. The first check valve is installed at the inlet, allowing fluid to enter the rodless chamber unidirectionally. The second check valve is installed at the outlet, allowing fluid to exit the rodless chamber unidirectionally.

[0023] In operation, a piston is driven by a drive unit to move along a first direction within the piston chamber. This allows the piston to compress either the rod chamber or the rodless chamber. When the rod chamber is compressed, the volume of the rodless chamber increases, and its internal pressure decreases. This allows fluid outside the piston chamber to enter the rodless chamber through the first one-way valve. This fluid includes both liquid and gas. Because the periphery of the plunger forms a continuous seal with the inner wall of the piston chamber, the fluid cannot enter the rod chamber. The space occupied by the liquid in the rodless chamber is denoted as the variable space, while the space occupied by the gas is the fixed space. This completes the feeding process of the piston pump. During this process, the second one-way valve is normally closed. Due to the lower elastic modulus of the liquid compared to the gas, the liquid undergoes less deformation when the piston compresses the rodless chamber. As the pressure inside the rodless chamber increases, the liquid and some gas can be discharged from the piston chamber through the second one-way valve, thus completing the unloading process of the piston pump. In this embodiment, by limiting the ratio of the volume of the immutable space to the volume of the variable space to be less than or equal to 15%, the working efficiency of the piston pump is improved, as well as the control accuracy of the piston pump during the pumping process is enhanced.

[0024] A washing device equipped with the aforementioned piston pump and a washing machine equipped with the aforementioned washing device are also provided. Regardless of whether the piston pump and the liquid storage box are upright or inverted, the washing machine can have high operating efficiency and control precision. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the piston pump provided in an embodiment of the present invention;

[0026] Figure 2 This is an exploded schematic diagram of the piston pump provided in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the piston structure provided in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the piston (excluding the filling part) provided in an embodiment of the present invention;

[0029] Figure 5 yes Figure 4 Sectional view at point AA;

[0030] Figure 6 This is an assembly diagram of the shell body and the one-way valve mounting component provided in an embodiment of the present invention;

[0031] Figure 7 yes Figure 6 Sectional view at point BB;

[0032] Figure 8 This is a top view of the shell body provided in an embodiment of the present invention;

[0033] Figure 9 yes Figure 8 Sectional view at CC;

[0034] Figure 10 This is a schematic diagram of the structure of the one-way valve mounting component provided in an embodiment of the present invention;

[0035] Figure 11 This is an assembly diagram (upright) of the piston pump and the liquid storage box provided in an embodiment of the present invention.

[0036] Figure 12 This is an inverted assembly diagram of the piston pump and the liquid storage box provided in an embodiment of the present invention.

[0037] In the picture:

[0038] X, first direction; Y, second direction; Z, third direction;

[0039] 1. Piston pump; 2. Liquid reservoir;

[0040] 10. Housing; 11. Piston chamber; 111. First limiting groove; 112. Second limiting groove; 12. Inlet; 13. Outlet; 14. Housing body; 141. Large diameter section; 142. Small diameter section; 143. Shoulder; 144. Clearance hole; 145. Second seal; 146. Insert groove; 15. Check valve mounting part; 151. Insert plate; 16. Pump top cover;

[0041] 20. Piston; 21. Rod; 211. Limiting part; 212. Slide groove; 22. Plunger part; 221. Process hole; 222. Annular groove; 223. First seal; 23. Filler part;

[0042] 30. Drive components;

[0043] 40. Transmission mechanism;

[0044] 51. First check valve; 52. Second check valve;

[0045] 60. Stabilizing components. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0049] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0050] like Figures 1 to 10As shown, the present invention provides a piston pump 1, including a housing 10, a piston 20, a drive component 30, a first check valve 51, and a second check valve 52. The housing 10 has a piston chamber 11, with an inlet 12 and an outlet 13 on one axial end face of the piston chamber 11. The piston 20 is placed within the piston chamber 11 and includes a plunger portion 22 and a rod portion 21 connected to each other. The plunger portion 22 forms a continuous circumferential seal with the inner circumferential wall of the piston chamber 11, dividing the piston chamber 11 into a rod chamber and a rodless chamber arranged along a first direction X. The rod portion 21 is located in the rod chamber, and the inlet 12 and outlet 13 are located in the rodless chamber. The cavity includes a variable space for filling liquid and a fixed space for filling gas, the ratio of the volume of the fixed space to the volume of the variable space is less than or equal to 15%; the output shaft of the drive member 30 is connected to the rod 21 of the piston 20 via the transmission mechanism 40, and can drive the piston 20 to move in the first direction X; the first one-way valve 51 is installed at the inlet 12, allowing fluid to enter the rodless cavity in one direction; the second one-way valve 52 is installed at the outlet 13, allowing fluid to exit the rodless cavity in one direction.

[0051] In operation, the piston 20 is driven by the drive component 30 to move along the first direction X within the piston chamber 11, allowing the piston 20 to compress either the rod chamber or the rodless chamber. When the rod chamber is compressed, the volume of the rodless chamber increases, and its internal pressure decreases, allowing fluid outside the piston chamber 11 to enter the rodless chamber through the first one-way valve 51. This fluid includes both liquid and gas. Because the periphery of the plunger portion 22 forms a continuous seal with the inner peripheral wall of the piston chamber 11, fluid cannot enter the rod chamber. The space occupied by the liquid in the rodless chamber is denoted as the variable space, while the space occupied by the gas in the rodless chamber is the fixed space. This completes the feeding process of the piston pump 1. During this process, the second one-way valve 52 is normally closed. Due to the lower elastic modulus of the liquid compared to the gas, the liquid undergoes less deformation when the piston 20 compresses the rodless chamber. As the pressure inside the rodless chamber increases, the liquid and some gas can be discharged from the second one-way valve 52 to the outside of the piston chamber 11, thus completing the unloading process of the piston pump 1.

[0052] Because the elastic modulus of gas is relatively large, when piston 20 compresses the rodless cavity, the invariable space is compressed first before the liquid is discharged. This makes it difficult to precisely match the feed rate of piston 20 with the liquid discharge rate. Furthermore, the presence of the invariable space reduces the proportion of the variable space in the rodless cavity, resulting in a significant difference between the theoretical and actual pumping volume of piston pump 1 per cycle. Additionally, since air cannot be avoided during the feeding process of piston pump 1, it is difficult to ensure that the upper end face of piston 20 is perfectly aligned with the end face of piston cavity 11 when piston 20 is at its top dead center, thus perpetually maintaining the invariable space. Therefore, in this embodiment, the ratio of the volume of the invariable space to the volume of the variable space is limited to less than or equal to 15% to improve the working efficiency of piston pump 1 and enhance the control accuracy during the pumping process.

[0053] Furthermore, taking the washing machine industry as an example, the parameter requirements for piston pump 1 are: flow accuracy ±10% of rated flow, suction lift 0.3 meters, and discharge head 3 meters. The difference between piston pump 1 in its forward configuration with the top cover facing upward and inverted configuration with the top cover facing downward is that the former can expel all the air inside the piston chamber 11, while the latter cannot expel the air in the constant volume portion. In the former, the liquid volume after expelling internal air is not affected by pressure changes under operating conditions, while in the latter, due to the presence of air inside the piston chamber 11, it remains a mixture of air and liquid. Therefore, the actual liquid volume during suction and discharge is significantly affected. To ensure that the flow deviation of piston pump 1 is within ±10% in both forward and inverted configurations, the constant volume inside the piston chamber 11 must be minimized. Under the rated conditions of detergent dispensing piston pump 1, the negative pressure inside the piston chamber 11 during suction is: suction lift -3 kPa + check valve opening pressure -10 kPa, and the pressure during discharge is: discharge head 30 kPa + check valve opening pressure 10 kPa. When piston pump 1 is inverted, a 13% increase in air volume can create a negative pressure of -13 kPa, and a 40% compression of air volume can create a pressure of 40 kPa. To ensure a flow rate accuracy of ±10% when the total air volume change (53% for both suction and discharge) remains constant, the rated flow rate is equal to the change in volume of piston chamber 11 per unit time (this is the same whether piston pump 1 is performing a single or multiple cycles per unit time). The maximum ratio of constant volume to variable volume is: rated flow rate L * 10% / 53% : rated flow rate L = 0.189 : 1. Based on this, the maximum ratio of constant volume to variable volume can be calculated to be 18.9 : 100. Considering the influence of tolerances and clearances of other parts, the ratio of constant volume to variable volume in piston pump 1 should be controlled to at least 15 : 100, meaning the constant volume should not exceed 15% of the variable volume.

[0054] Optionally, the peripheral wall of the plunger portion 22 is formed with an annular groove 222 around its axis. A first seal 223 is provided in the annular groove 222. Part of the first seal 223 is located in the annular groove 222, and the other part can abut against the inner peripheral wall of the piston chamber 11 in the annular groove 222 to seal.

[0055] Optionally, the housing of the drive unit 30 is provided with connecting ears, which are fixed to the housing 10 by threaded fasteners.

[0056] Optionally, the piston pump 1 also includes a stabilizer 60, which is sleeved on the outside of the housing of the drive unit 30. The stabilizer 60 is connected to the housing 10 by a snap-fit, and is used to maintain the relative stability of the drive unit 30 and the housing 10, and reduce the shaking generated when the drive unit 30 starts.

[0057] Optionally, the piston 20 also includes a filling part 23. The plunger part 22 of the piston 20 is an injection molded part, and a process hole 221 is formed on the side opposite to the rod part 21. The filling part 23 is installed in the process hole 221.

[0058] For example, the plunger portion 22 is made of injection molded material, which has a simple processing technology and relatively low production cost. However, due to the processing technology, generally, the plunger portion 22 has a process hole 221 formed on the side opposite to the rod portion 21. When the piston 20 is assembled in the piston chamber 11, air is retained in the process hole 221, increasing the volume of the immutable space in the rodless chamber. Therefore, a filler is also provided, which is installed in the process hole 221 to fill and seal the process hole 221. In this embodiment, the process hole 221 is cylindrical, and the filler is a cylinder adapted to it. The filler is inserted into the process hole 221 and has an interference fit with the plunger portion 22.

[0059] Optionally, the housing 10 includes a housing body 14 and a one-way valve mounting member 15. The one-way valve mounting member 15 is fixed to the housing body 14. The inlet 12 and the outlet 13 are both disposed on the one-way valve mounting member 15. The end face of the one-way valve mounting member 15 facing the plunger portion 22 is adapted to the end face of the plunger portion 22 facing the one-way valve mounting member 15.

[0060] For example, the shell body 14 has a stepped hole along the first direction X. The stepped hole includes a large-diameter section 141, a small-diameter section 142, and a shoulder 143 formed between the large-diameter section 141 and the small-diameter section 142 arranged along the first direction X. The one-way valve fixing member is installed in the large-diameter section 141 and abuts against the shoulder 143 in the first direction X. The small-diameter section 142 forms a piston chamber 11. In this embodiment, the end face of the one-way valve mounting member 15 facing the piston portion 22 in the first direction X is a plane, and the end face of the piston portion 22 facing the one-way valve mounting member 15 in the first direction X is a plane. The two planes are parallel, which can reduce the gap between the piston portion 22 and the one-way valve, thereby reducing the volume of the fixed container. In other embodiments, the two end faces may also be curved surfaces, etc.

[0061] Optionally, a foolproof structure is provided between the one-way valve mounting part 15 and the housing body 14.

[0062] For example, the one-way valve mounting part 15 is provided with a plug-in piece 151, which is adjacent to only one of the inlet 12 and the outlet 13. The housing body 14 is provided with a corresponding plug-in groove 146, and the plug-in piece 151 is inserted into the plug-in groove 146, so as to prevent the one-way valve mounting part 15 and the housing body 14 from being inverted during assembly.

[0063] Optionally, the transmission mechanism 40 is installed inside the housing 10, and the output shaft of the drive member 30 can pass through the housing 10 and be connected to the transmission mechanism 40, and the output shaft of the drive member 30 and the housing 10 form a circumferential seal.

[0064] For example, the housing 10 also has an eccentric wheel cavity, in which the eccentric wheel is installed. The housing 10 has a clearance hole 144. When the eccentric wheel is assembled in the eccentric wheel cavity, the center of the eccentric wheel is exposed in the clearance hole 144. A non-circular hole is formed at the center of the eccentric wheel; in this embodiment, it is an oblong hole. The output shaft of the drive member 30 is a corresponding oblong shape, passing through the clearance hole 144 and inserted into the oblong hole. A second seal 145 is installed on the inner peripheral wall of the clearance hole 144. The second seal 145 can fill and seal the gap between the output shaft and the inner peripheral wall of the clearance hole 144. When the liquid in the rodless cavity leaks into the rod cavity, the second seal 145 can prevent the liquid from leaking into the drive member 30.

[0065] Optionally, the transmission mechanism 40 is an eccentric wheel, the output shaft of the drive component 30 is fixed to the center of the eccentric wheel, and the rod portion 21 of the piston 20 is connected to the eccentric wheel at the eccentric position of the eccentric wheel.

[0066] For example, an oblong hole is provided at the center of the eccentric wheel, and a plug is provided on the eccentric wheel at the eccentric position. The axis of the plug is parallel to the axis of the eccentric wheel. A groove 212 is provided at the end of the rod 21 of the piston 20 away from the plunger 22. The length direction of the groove 212 and the axis of the plug are perpendicular to the first direction X. The plug is inserted into the groove 212 and can move relative to the piston 20 along the length direction of the groove 212. Thus, the groove 212 provides the degree of freedom. When the drive member 30 drives the eccentric wheel to rotate, the plug can abut against the opposite sides of the groove 212 in the first direction X and drive the piston 20 to move relative to the housing 10 in the first direction X.

[0067] In other embodiments, the transmission mechanism 40 may also be a crank-slider structure. In the art, converting rotational motion into linear motion through a crank-slider is a well-known technique, and its structure will not be described in detail here.

[0068] Optionally, the piston chamber 11 has a first limiting groove 111 on its inner peripheral wall in the second direction Y. The length direction of the first limiting groove 111 is parallel to the first direction X, and the width direction is parallel to the third direction Z. At least part of the rod portion 21 of the piston 20 can be inserted into the first limiting groove 111 and can move along the first direction X in the first limiting groove 111. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0069] For example, the piston cavity 11 has a first limiting groove 111 on its inner peripheral wall in the second direction Y. The depth direction of the first limiting groove 111 is parallel to the second direction Y, and the length direction is parallel to the first direction X. The piston 20 can be inserted into the first limiting groove 111. The first limiting groove 111 has two opposite side walls in the third direction Z, which can restrict the relative movement of the piston 20 in the third direction Z within the piston cavity 11, thus regulating the movement trajectory of the piston 20.

[0070] Optionally, the piston chamber 11 has a second limiting groove 112 on its inner peripheral wall in the third direction Z. The length direction of the second limiting groove 112 is parallel to the first direction X, and the width direction is parallel to the second direction Y. The rod portion 21 of the piston 20 can be inserted into the second limiting groove 112 at least partially, and can move in the second limiting groove 112 along the first direction X. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0071] For example, the piston cavity 11 has a second limiting groove 112 on its inner peripheral wall in the third direction Z. The depth direction of the second limiting groove 112 is parallel to the third direction Z, and the length direction is parallel to the first direction X. The piston 20 has a limiting part 211 protruding from it. The limiting part 211 can be inserted into the second limiting groove 112 at least partially. The two opposite side walls of the second limiting groove 112 in the second direction Y can restrict the relative movement of the piston 20 in the piston cavity 11 in the second direction Y, thus regulating the movement trajectory of the piston 20.

[0072] Furthermore, the piston pump 1 also includes a pump top cover 16, which is fixed to the housing body 14. A one-way valve fixing component is located between the pump top cover 16 and the housing body 14. The pump top cover 16 includes an inlet pipe and a outlet pipe. The inlet pipe corresponds to the first one-way valve 51, and the outlet pipe corresponds to the second one-way valve 52.

[0073] Furthermore, the pump top cover 16 is fixed to the housing body 14 by a snap-fit ​​structure.

[0074] Furthermore, the pump top cover 16 is fixed to the one-way valve mounting piece 15 by a snap-fit ​​structure.

[0075] like Figure 11 and Figure 12 As shown, the present invention also provides a washing device, including a liquid storage box 2 and the piston pump 1 mentioned above. The inlet 12 of the piston pump 1 can obtain fluid from the liquid storage box 2. For example, the fluid is laundry detergent.

[0076] The present invention also provides a washing machine, characterized in that it includes the above-described washing device. Thus, regardless of whether the piston pump 1 and the liquid storage tank 2 are upright or inverted, the washing machine can achieve high operating efficiency and control precision.

[0077] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A piston pump, used in a washing machine, characterized in that, The piston pump includes: The housing (10) has a piston chamber (11) inside, and an inlet (12) and an outlet (13) are provided on one axial side end face of the piston chamber (11). A piston (20) is placed inside a piston chamber (11). The piston (20) includes a plunger portion (22) and a rod portion (21) connected to each other. The plunger portion (22) and the inner peripheral wall of the piston chamber (11) form a continuous seal along the circumferential direction, dividing the piston chamber (11) into a rod chamber and a rodless chamber arranged along a first direction (X). The rod portion (21) is located in the rod chamber. The feed port (12) and the discharge port (13) are located in the rodless chamber. The rodless chamber includes a variable space for filling liquid and a fixed space for filling gas. The ratio of the volume of the fixed space to the volume of the variable space is less than or equal to 15%. The drive member (30) has its output shaft connected to the rod (21) of the piston (20) via a transmission mechanism (40), and is capable of driving the piston (20) to move along the first direction (X). A first check valve (51) is installed at the feed inlet (12) to allow fluid to enter the rodless chamber in one direction. A second check valve (52) is installed at the outlet (13) to allow the fluid to be discharged unidirectionally from the rodless chamber.

2. The piston pump according to claim 1, characterized in that, The piston (20) also includes a filling part (23). The plunger part (22) of the piston (20) is an injection molded part, and a process hole (221) is formed on the side opposite to the rod part (21). The filling part (23) is installed in the process hole (221).

3. The piston pump according to claim 1, characterized in that, The housing (10) includes a housing body (14) and a one-way valve mounting component (15). The one-way valve mounting component (15) is fixed to the housing body (14). The inlet (12) and the outlet (13) are both located on the one-way valve mounting component (15). The end face of the one-way valve mounting component (15) facing the plunger part (22) is adapted to the end face of the plunger part (22) facing the one-way valve mounting component (15).

4. The piston pump according to claim 3, characterized in that, A foolproof structure is provided between the one-way valve mounting component (15) and the housing body (14).

5. The piston pump according to claim 1, characterized in that, The transmission mechanism (40) is installed inside the housing (10), and the output shaft of the drive member (30) can pass through the housing (10) and connect to the transmission mechanism (40), and the output shaft of the drive member (30) and the housing (10) form a circumferential seal.

6. The piston pump according to any one of claims 1-5, characterized in that, The transmission mechanism (40) is an eccentric wheel, the output shaft of the drive member (30) is fixed to the center of the eccentric wheel, and the rod (21) of the piston (20) is connected to the eccentric wheel at the eccentric position of the eccentric wheel.

7. The piston pump according to any one of claims 1-5, characterized in that, The piston cavity (11) has a first limiting groove (111) on its inner peripheral wall in the second direction (Y). The length direction of the first limiting groove (111) is parallel to the first direction (X), and the width direction is parallel to the third direction (Z). At least part of the rod (21) of the piston (20) can be inserted into the first limiting groove (111) and can move in the first limiting groove (111) along the first direction (X). The first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other.

8. The piston pump according to any one of claims 1-5, characterized in that, The piston cavity (11) has a second limiting groove (112) on its inner peripheral wall in the third direction (Z). The length direction of the second limiting groove (112) is parallel to the first direction (X), and the width direction is parallel to the second direction (Y). At least part of the rod (21) of the piston (20) can be inserted into the second limiting groove (112) and can move in the second limiting groove (112) along the first direction (X). The first direction (X), the second direction (Y), and the third direction (Z) are perpendicular to each other.

9. A washing device, characterized in that, The device includes a reservoir (2) and a piston pump according to any one of claims 1-8, wherein the feed port (12) of the piston pump is capable of obtaining the fluid from the reservoir (2).

10. A washing machine, characterized in that, Includes the washing equipment as described in claim 9.

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