Motor pump

Abstract

The utility model provides a kind of motor pump, motor assembly is driven to connect with plunger pump assembly;Shutdown device is detachably connected with plunger pump assembly;Plunger pump assembly includes: pump body, bearing assembly, plunger and pump cover;Plunger is installed on pump body, plunger is located at the two ends of the two sides of pump body respectively and is provided with pump cover, pump cover is connected with pump body setting;Pump body and pump cover are formed with one-way valve cavity, one-way valve assembly is installed in one-way valve cavity;Motor assembly is driven to connect with plunger through bearing assembly.The utility model uses single plunger pump as the booster pump of lithium battery cleaning machine, so that efficiency is higher, the pressure, flow of pump output is greater or the endurance time of battery pack is longer.

Description

Technical Field

[0001] This utility model relates to the field of pump equipment technology, specifically to an electric motor pump, and more particularly to a high-efficiency micro electric motor pump unit. Background Technology

[0002] High-pressure washers are increasingly used in household cleaning due to their high efficiency, cleanliness, and environmental friendliness. With the development and application of lithium battery technology, more and more lithium-ion DC-powered washers are replacing traditional AC-powered corded washers. The pumps used with AC motors have high load capacity and large size, making them suitable only for high-power operation. Lithium-ion battery packs, however, have limited energy, and their power output is generally much lower than that of AC-powered washers. When paired with lithium-ion battery packs, the pumps used with AC motors are inefficient at lower power levels, and their large size and complex component configuration also increase costs.

[0003] Existing technology uses traditional three-plunger pumps, which are large in size, complex in structure, and have high cost. Due to the large number of parts and complex transmission, the overall efficiency is low. Furthermore, existing designs do not consider modular design, resulting in low component standardization and high management costs.

[0004] Furthermore, traditional automatic shutdown devices are fixed to the pump body and cannot be disassembled, meaning they are an essential component of the pump assembly. However, in reality, pump assemblies used in handheld cleaning machines do not require an automatic shutdown device. This is because handheld cleaning machines directly connect or disconnect the power supply via buttons or triggers on the handle, eliminating the need for a pressure switch to control the motor's power supply. Therefore, when used in handheld cleaning machines, an automatic shutdown device is redundant.

[0005] The purpose of this invention is to provide a single-plunger motor pump unit that is compact, low-cost, and highly efficient. It also incorporates modular design, enabling the motor pump unit to be used in both handheld and portable cleaning machines.

[0006] Patent document CN104279167B discloses a motor pump and a washing appliance incorporating the motor pump. The motor pump includes a pump housing with an inlet and first and second outlets. A motor and impeller capable of forward and reverse rotation are disposed within the pump housing. A flow divider, driven by water flow, is also disposed within the pump housing and selectively blocks the first and second outlets. The pump housing has a sliding groove for housing the flow divider. The washing appliance incorporates the aforementioned motor pump. However, this patent document still suffers from drawbacks such as large size, complex structure, high cost, and low overall efficiency.

[0007] Patent document CN216812039U discloses a motor-pump unit for a lithium-ion battery high-pressure washer. Its structure involves a DC motor driving a high-pressure pump via a reduction gear mechanism. The matched high-pressure pump is a three-plunger high-pressure pump. In the improved solution of this patent document, the efficiency enhancement is achieved by changing the lubrication method of the cylinder transmission from oil lubrication to grease lubrication, and removing the oil seal between the cylinder and the gearbox to avoid wear between the oil seal and the shaft. This can improve mechanical efficiency to some extent. However, this patent document still suffers from drawbacks such as large size, complex structure, high cost, and low overall efficiency. Utility Model Content

[0008] In view of the deficiencies in the prior art, the purpose of this utility model is to provide an electric motor pump.

[0009] According to the present invention, a motor pump includes:

[0010] plunger pump assembly;

[0011] The motor assembly is driven and connected to the plunger pump assembly;

[0012] A shutdown device is detachably connected to the plunger pump assembly;

[0013] The plunger pump assembly includes: a pump body, a bearing assembly, a plunger, and a pump cover;

[0014] The plunger is mounted on the pump body, and the pump cover is provided at both ends of the plunger on both sides of the pump body. The pump cover is connected to the pump body.

[0015] A one-way valve cavity is formed on the pump body and the pump cover, and a one-way valve assembly is installed in the one-way valve cavity;

[0016] The motor assembly is driven to the plunger via the bearing assembly.

[0017] Preferably, the pump body is provided with:

[0018] A transmission cavity for mounting the bearing assembly;

[0019] A plunger cavity for mounting the plunger;

[0020] The first inlet check valve chamber is used to install the check valve assembly;

[0021] The first outlet check valve chamber is used to install the check valve assembly;

[0022] The pump cover is provided with:

[0023] The second inlet check valve chamber is used to install the check valve assembly;

[0024] The second outlet check valve chamber is used to install the check valve assembly.

[0025] Preferably, the one-way valve assembly includes:

[0026] The inlet check valve passes through the first inlet check valve cavity, and its two ends are respectively located in the second inlet check valve cavities of the two pump covers;

[0027] The outlet check valve is installed through the first outlet check valve cavity, and its two ends are respectively located in the second outlet check valve cavities of the two pump covers.

[0028] Preferably, the pump body is provided with:

[0029] The pump body inlet is connected to an inlet connector;

[0030] The pump outlet can be connected to the shutdown device.

[0031] Preferably, the centerline of the plunger, the centerline of the inlet check valve, and the centerline of the outlet check valve are parallel.

[0032] The centerline of the plunger is perpendicular to the centerline of the bearing assembly;

[0033] The centerline of the pump body inlet is perpendicular to the centerline of the pump body outlet and parallel to the centerline of the bearing assembly.

[0034] Preferably, the plunger is provided with a drive groove;

[0035] The bearing assembly includes a drive bearing, which is installed in the drive groove and is capable of driving the plunger to reciprocate.

[0036] Preferably, the plunger pump assembly further includes: a main check valve core and a main check valve spring;

[0037] The main one-way valve core and the main one-way valve spring are disposed in the pump body and located at the pump body outlet position.

[0038] Preferably, the plunger pump assembly further includes: a water seal, a water seal support, and an oil seal;

[0039] The water seal, the water seal bracket, and the oil seal constitute a sealing structure, and the pump cover is sealed to the pump body through the sealing structure.

[0040] Preferably, the motor assembly includes: a motor, a motor bracket, an internal gear, planetary gears, and a planet carrier;

[0041] The motor is mounted on the motor bracket;

[0042] The internal gear, the planetary gears, and the planetary frame form a reduction structure, and the motor is driven to the bearing assembly through the reduction structure.

[0043] Preferably, the shutdown device includes: a valve body, a micro switch, a quick-connect coupling, a valve core, and a spring;

[0044] The valve body is provided with a valve body inlet and a valve body outlet;

[0045] The valve body inlet is connected to the pump body outlet, and the main one-way valve core and the main one-way valve spring are provided between the valve body inlet and the pump body outlet;

[0046] A quick-connect plug is connected to the outlet of the valve body.

[0047] A micro switch box is connected to the valve body, the micro switch is disposed inside the micro switch box, and a micro switch cover is provided at the open end of the micro switch box.

[0048] The valve core is installed in the valve body. The small end of the valve core passes through the spring and is connected to the micro switch. The large end of the valve core is connected to the quick-connect plug.

[0049] Compared with the prior art, the present invention has the following beneficial effects:

[0050] 1. This utility model changes the conventional three-plunger pump to a single-plunger double-acting pump, and sets a pump cover and a one-way valve at both ends of a single plunger, which makes the overall volume smaller, fewer parts, and lower cost. Moreover, the single-plunger pump assembly has higher transmission efficiency because its movement range is smaller than that of the three-plunger pump.

[0051] 2. This utility model integrates the shutdown device, valve body, and micro switch box into one unit, which is simple to install and low in cost. Furthermore, the valve body is designed to be detachable from the pump body, so that the motor pump unit can be used in both handheld and portable cleaning machines, thus improving the versatility of the components. Attached Figure Description

[0052] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0053] Figure 1 An exploded view of the components of the electric pump;

[0054] Figure 2 An exploded view of the various parts of the electric pump;

[0055] Figure 3An assembly diagram showing the assembly of the various parts of the motor pump.

[0056] The diagram shows:

[0057] Motor assembly 100, water seal bracket 206

[0058] Motor 101 Oil Seal 207

[0059] Motor bracket 102, inlet check valve 208

[0060] Internal gear 103, outlet check valve 209

[0061] Planetary gear 104, main one-way valve core 210

[0062] Planetary carrier 105, main one-way valve spring 211

[0063] Piston pump assembly 200, inlet connector 212

[0064] Pump body 201 Shutdown device 300

[0065] Pump body inlet 201a, valve body 301

[0066] Pump body outlet 201b, valve body inlet 301a

[0067] First inlet check valve chamber 201c, valve body outlet 301b

[0068] First outlet check valve chamber 201d, micro switch box 301c

[0069] Piston cavity 201e micro switch 302

[0070] Screw hole 201f, micro switch cover 303

[0071] Bearing assembly 202, quick-connect fitting 304

[0072] Drive bearing 202a, seal ring 305

[0073] Piston 203, Valve Core 306

[0074] Drive slot 203a, valve core large end 306a

[0075] Pump cover 204, valve core small end 306b

[0076] Second inlet check valve chamber 204a, spring 307

[0077] Second outlet check valve chamber 204b, sealing ring 308

[0078] Water seal 205 U-pin 309 Detailed Implementation

[0079] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0080] Example 1

[0081] like Figures 1 to 3 As shown, this embodiment provides an electric motor pump, including: a motor assembly 100, a plunger pump assembly 200, and a shutdown device 300. The motor assembly 100 is drivenly connected to the plunger pump assembly 200; the shutdown device 300 is detachably connected to the plunger pump assembly 200. The plunger pump assembly 200 includes: a pump body 201, a bearing assembly 202, a plunger 203, and a pump cover 204; the plunger 203 is mounted on the pump body 201, and pump covers 204 are respectively provided at both ends of the plunger 203 on both sides of the pump body 201, and the pump covers 204 are connected to the pump body 201; a one-way valve cavity is formed on the pump body 201 and the pump cover 204, and a one-way valve assembly is installed in the one-way valve cavity; the motor assembly 100 is drivenly connected to the plunger 203 through the bearing assembly 202.

[0082] The pump body 201 is provided with a pump body inlet 201a and a pump body outlet 201b. The pump body inlet 201a is connected to an inlet connector 212; the pump body outlet 201b can be connected to a shutdown device 300. The plunger 230 is provided with a drive groove 203a; the bearing assembly 202 includes a drive bearing 202a, which is installed in the drive groove 203a and can drive the plunger 230 to reciprocate.

[0083] The motor assembly 100 includes: a motor 101, a motor bracket 102, an internal gear 103, planetary gears 104, and a planetary carrier 105; the motor 101 is mounted on the motor bracket 102; the internal gear 103, planetary gears 104, and planetary carrier 105 constitute a reduction gear structure, and the motor 101 is driven to the bearing assembly 202 through the reduction gear structure.

[0084] The pump body 201 is provided with: a transmission chamber, a plunger chamber 201e, a first inlet check valve chamber 201c, and a first outlet check valve chamber 201d. The transmission chamber is used to install the bearing assembly 202; the plunger chamber 201e is used to install the plunger 203; the first inlet check valve chamber 201c is used to install the check valve assembly; and the first outlet check valve chamber 201d is used to install the check valve assembly. The pump cover 204 is provided with: a second inlet check valve chamber 204a and a second outlet check valve chamber 204b; the second inlet check valve chamber 204a is used to install the check valve assembly; and the second outlet check valve chamber 204b is used to install the check valve assembly. The one-way valve assembly includes: an inlet one-way valve 208 and an outlet one-way valve 209; the inlet one-way valve 208 is disposed through the first inlet one-way valve chamber 201c, and its two ends are respectively located in the second inlet one-way valve chambers 204a of the two pump covers 204; the outlet one-way valve 209 is disposed through the first outlet one-way valve chamber 201d, and its two ends are respectively located in the second outlet one-way valve chambers 204b of the two pump covers 204.

[0085] The centerline of the plunger 203, the centerline of the inlet check valve 208, and the centerline of the outlet check valve 209 are parallel; the centerline of the plunger 203 is perpendicular to the centerline of the bearing assembly 202; the centerline of the pump body inlet 201a is perpendicular to the centerline of the pump body outlet 201b and parallel to the centerline of the bearing assembly 202.

[0086] The plunger pump assembly 200 further includes: a main check valve core 210 and a main check valve spring 211; the main check valve core 210 and the main check valve spring 211 are disposed inside the pump body 201 and located at the pump body outlet 201b of the pump body 201. The plunger pump assembly 200 also includes: a water seal 205, a water seal bracket 206, and an oil seal 207; the water seal 205, the water seal bracket 206, and the oil seal 207 constitute a sealing structure, and the pump cover 204 is sealed to the pump body 201 through the sealing structure.

[0087] The shutdown device 300 includes: a valve body 301, a micro switch 302, a quick-connect coupling 304, a valve core 306, and a spring 307; the valve body 301 is provided with a valve body inlet 301a and a valve body outlet 301b; the valve body inlet 301a is connected to the pump body outlet 201b of the pump body 201, and a main one-way valve core 210 and a main one-way valve spring 211 are provided between the valve body inlet 301a and the pump body outlet 201b; the valve body outlet 301a... A quick-connect plug 304 is connected at point 1b; a micro switch box 301c is connected to the valve body 301, and a micro switch 302 is disposed inside the micro switch box 301c. A micro switch cover 303 is provided at the open end of the micro switch box 301c; a valve core 306 is installed inside the valve body 301, and the small end 306b of the valve core 306 passes through the spring 307 and is connected to the micro switch 302, while the large end 306a of the valve core 306 is connected to the quick-connect plug 304.

[0088] Example 2

[0089] Those skilled in the art can understand this embodiment as a more specific description of Embodiment 1.

[0090] This embodiment provides a high-efficiency miniature cleaning machine motor pump unit with automatic shutdown function, including: motor assembly 100, plunger pump assembly 200 and shutdown device 300.

[0091] The motor assembly 100 includes a motor 101, a motor bracket 102, an internal gear 103, planetary gears 104, and a planetary carrier 105, etc.

[0092] The plunger pump assembly 200 includes a pump body 201, a plunger 203, a bearing assembly 202, and a pump cover 204 at each end of the plunger. The pump body includes a transmission chamber, a plunger chamber 201e, a first inlet check valve chamber 201c, a first outlet check valve chamber 201d, a valve body inlet 201a, and a valve body outlet 201b. The transmission cavity is equipped with a bearing assembly 202, and the plunger 203 is installed in the plunger cavity 201e; the first inlet check valve cavity 201c is equipped with an inlet check valve 208; the first outlet check valve cavity 201d is equipped with an outlet check valve 209; the valve body inlet 201a is equipped with an inlet connector 212; the pump cover 204 has a second inlet check valve cavity 204a and a second outlet check valve cavity 204b; the two ends of the inlet check valve 208 and the outlet check valve 209 are respectively inserted into the mounting cavities of the pump cover 204 on both sides of the pump body 201.

[0093] The axes of the plunger 203, the inlet check valve 208, and the outlet check valve 209 are all perpendicular to the axis of the bearing assembly. The axis of the valve body inlet 201a is perpendicular to the axis of the valve body outlet 201b. The pump body also has two pump cover screw mounting holes 201f, through which the pump covers on both sides of the pump body are connected to the pump body by bolts.

[0094] The plunger has a drive groove 203a in the middle, and a drive bearing 202a for driving the plunger to reciprocate is installed in the groove; the two ends of the plunger are respectively provided with a pump cover 204, an inlet check valve 208, an outlet check valve 209 and a water seal 205 and other pressurizing elements; the motor assembly also includes a reduction structure, which includes a planetary carrier 105, a planetary gear 104 and an internal gear 103.

[0095] The shutdown device includes a valve body 301, a valve core 306, a spring 307, and a micro switch 302. The valve body includes a valve body inlet 301a and a valve body outlet 301b.

[0096] The valve body inlet 301a is connected to the pump body outlet 201b, and the valve body outlet 301b is connected to the quick-connect fitting 304, which can be connected to the high-pressure pipe.

[0097] On the side of the valve body 301 opposite to its water outlet, a micro switch box 301c is integrally injection molded, and a micro switch 302 is installed inside the micro switch box 301c.

[0098] The valve body 301 has a through hole at the other end opposite to the valve body outlet 301b; the valve core has a large end 306a and a small end 306b. When the valve core is installed in the valve body, the large end 306a is supported on the spring 307, and the small end 306b abuts against the micro switch 302 through the through hole.

[0099] The pump body outlet 201b is also equipped with a main one-way valve core 210 and a main one-way valve spring 211. When the water gun connected to the high-pressure pipe is turned off, the system pipeline pressure will continue to rotate because the motor is still powered on, thus the pump continues to output pressurized water flow, causing the pipeline pressure to rise. The rise in pipeline pressure will cause the valve core 306 to move towards the small end 306b of the valve core, that is, push the micro switch contact to disconnect the motor power supply. At the same time, since the water gun valve is in the closed state, there is no liquid flowing in the pipeline. Under the action of the main one-way valve spring 211 and the internal pipeline pressure, the main one-way valve core 210 will reverse to block the water outlet channel, so that the pipeline channel between the main one-way valve core 210 and the gun valve is in a pressure-holding state. Under the action of this pressure-holding pressure, the valve core 306 is kept in the pushed-out state, that is, the micro switch 302 is in the state of being triggered by the valve core 306 to maintain the power-off state.

[0100] When the water gun valve opens and sprays water, the pressure decreases, and under the action of the spring 307, the valve core 306 will move towards the large end 301a of the valve core. That is, the valve core 306 moves away from the micro switch 302, the micro switch closes again, the motor is powered on and started, and the machine returns to working status.

[0101] This embodiment addresses the relatively low power consumption of lithium-ion batteries by designing a compact, simple, and low-cost motor-pump assembly. Furthermore, the shutdown device is designed as an independent, detachable component, allowing the motor-pump unit to be used with a handheld cleaning machine when the shutdown device is not installed. When the shutdown device is installed, it can be used with a portable cleaning machine. In this case, the pressurized water output from the motor-pump is delivered to the spray gun via the overflow shutdown device and high-pressure pipe. The spray gun trigger controls the opening and closing of the gun valve, causing changes in pipeline pressure, which further controls the microswitch of the overflow shutdown device, thus controlling the machine's start and stop.

[0102] In this embodiment, on the one hand, by using a single plunger pump (instead of a three-plunger pump) as the booster pump for the lithium battery cleaning machine, the efficiency is higher, resulting in greater pump output pressure and flow rate or longer battery pack runtime; on the other hand, the detachable modular shutdown device allows the single plunger motor pump unit to be used in both handheld and portable cleaning machines, improving the standardization of components and reducing management costs.

[0103] Compared with the prior art, this embodiment changes the conventional three-plunger pump to a single-plunger double-acting pump, that is, a pump cover and a one-way valve are respectively set at both ends of a single plunger, which makes the overall volume smaller, fewer parts, and lower cost; the single-plunger pump assembly has higher transmission efficiency because the moving parts are smaller than those of the three-plunger pump.

[0104] In this embodiment, the shutdown device, valve body, and micro switch box are integrated into one unit, which is simple to install and low in cost. Furthermore, the valve body is designed to be detachable from the pump body, so that the motor pump unit can meet the needs of two different models, thus improving the versatility of the components.

[0105] This invention uses a single plunger pump as the booster pump for a lithium battery cleaning machine, which results in higher efficiency, greater pump output pressure and flow rate, or longer battery pack runtime.

[0106] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and 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 this application.

[0107] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the substantive content of this utility model. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. An electric motor pump, characterized in that, include: Piston pump assembly (200); The motor assembly (100) is drivenly connected to the plunger pump assembly (200); A shutdown device (300) is detachably connected to the plunger pump assembly (200); The plunger pump assembly (200) includes: a pump body (201), a bearing assembly (202), a plunger (203), and a pump cover (204). The plunger (203) is mounted on the pump body (201), and the plunger (203) is provided with pump covers (204) at both ends on both sides of the pump body (201), and the pump covers (204) are connected to the pump body (201). A one-way valve cavity is formed on the pump body (201) and the pump cover (204), and a one-way valve assembly is installed in the one-way valve cavity; The motor assembly (100) is driven to the plunger (203) via the bearing assembly (202).

2. The electric pump according to claim 1, characterized in that, The pump body (201) is provided with: A transmission cavity for mounting the bearing assembly (202). The plunger cavity (201e) is used to install the plunger (203); The first inlet check valve chamber (201c) is used to install the check valve assembly; The first outlet check valve chamber (201d) is used to install the check valve assembly; The pump cover (204) is provided with: The second inlet check valve chamber (204a) is used to install the check valve assembly; The second outlet check valve chamber (204b) is used to install the check valve assembly.

3. The electric pump according to claim 2, characterized in that, The one-way valve assembly includes: The inlet check valve (208) is installed through the first inlet check valve chamber (201c), and its two ends are respectively located in the second inlet check valve chambers (204a) of the two pump covers (204); The outlet check valve (209) is installed through the first outlet check valve chamber (201d), and its two ends are respectively located in the second outlet check valve chambers (204b) of the two pump covers (204).

4. The electric pump according to claim 3, characterized in that, The pump body (201) is provided with: The pump body inlet (201a) is connected to an inlet connector (212); The pump outlet (201b) can be connected to the shutdown device (300).

5. The electric pump according to claim 4, characterized in that, The centerline of the plunger (203), the centerline of the inlet check valve (208), and the centerline of the outlet check valve (209) are parallel. The centerline of the plunger (203) is perpendicular to the centerline of the bearing assembly (202); The centerline of the pump body inlet (201a) is perpendicular to the centerline of the pump body outlet (201b) and parallel to the centerline of the bearing assembly (202).

6. The electric pump according to claim 1, characterized in that, The plunger (203) is provided with a drive groove (203a); The bearing assembly (202) includes a drive bearing (202a) which is installed in the drive groove (203a) and is capable of driving the plunger (203) to reciprocate.

7. The electric pump according to claim 1, characterized in that, The plunger pump assembly (200) further includes: a main check valve core (210) and a main check valve spring (211). The main one-way valve core (210) and the main one-way valve spring (211) are disposed inside the pump body (201) and located at the pump body outlet (201b) of the pump body (201).

8. The electric pump according to claim 1, characterized in that, The plunger pump assembly (200) also includes: a water seal (205), a water seal bracket (206), and an oil seal (207); The water seal (205), the water seal bracket (206), and the oil seal (207) constitute a sealing structure, and the pump cover (204) is sealed to the pump body (201) through the sealing structure.

9. The electric pump according to claim 1, characterized in that, The motor assembly (100) includes: a motor (101), a motor bracket (102), an internal gear (103), a planetary gear (104), and a planet carrier (105). The motor (101) is mounted on the motor bracket (102); The internal gear (103), the planetary gear (104), and the planetary carrier (105) constitute a reduction gear structure, and the motor (101) is driven to the bearing assembly (202) through the reduction gear structure.

10. The electric pump according to claim 7, characterized in that, The shutdown device (300) includes: a valve body (301), a micro switch (302), a quick connector (304), a valve core (306), and a spring (307); The valve body (301) is provided with a valve body inlet (301a) and a valve body outlet (301b). The valve body inlet (301a) is connected to the pump body outlet (201b) of the pump body (201), and the main one-way valve core (210) and the main one-way valve spring (211) are provided between the valve body inlet (301a) and the pump body outlet (201b). A quick-connect fitting (304) is connected to the outlet (301b) of the valve body. A micro switch box (301c) is connected to the valve body (301), the micro switch (302) is disposed inside the micro switch box (301c), and a micro switch cover (303) is provided at the open end of the micro switch box (301c). The valve core (306) is installed inside the valve body (301). The small end (306b) of the valve core (306) passes through the spring (307) and is connected to the micro switch (302). The large end (306a) of the valve core (306) is connected to the quick connector (304).

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