A lance attachment for a steam cleaning apparatus

Abstract

A spray gun accessory for a steam cleaning device includes a spray gun housing with an internal mounting cavity, one end of which is a steam inlet and the other end is a steam outlet; a nozzle tube disposed in the mounting cavity, with its front end extending out of the spray gun housing through the steam outlet end; a steam inlet pipe disposed at the steam inlet end; a conduit connecting the nozzle tube and the steam inlet pipe; a trigger switch rotatably connected to the spray gun housing; an on / off valve movably disposed in the nozzle tube, the on / off valve and the trigger switch forming a transmission engagement, such that the on / off valve has at least a fully open position and a fully closed position; and a tension spring, the front end of which is connected to the nozzle tube and the rear end of which is connected to the on / off valve. In this invention, the tension spring directly acts on the on / off valve, ensuring that the on / off valve resets to stop steam output, thus ensuring safety. The tension spring and the on / off valve are separately designed, completely avoiding defects caused by high-temperature steam.

Description

Technical Field

[0001] This utility model relates to the technical field of steam spray gun accessories, and in particular to a spray gun accessory for steam cleaning equipment. Background Technology

[0002] Steam cleaners, also known as saturated steam cleaners, utilize the high temperature and pressure of saturated steam to clean oil stains and dirt from the surface of parts, vaporizing and evaporating them. They can clean any tiny gaps and holes, peeling off and removing oil stains and residues, achieving high efficiency, water conservation, cleanliness, dryness, and low cost, replacing expensive dry ice cleaning. The working principle of a steam cleaner is that the high-temperature steam accelerates the movement of molecules on the dirt surface, breaking down the binding forces between them to eliminate various stubborn stains. Simultaneously, it completely eliminates various bacteria, mites, microorganisms, and pathogens attached to objects. Equipped with nozzles, brushes, and other convenient accessories, it is environmentally friendly, requiring no cleaning agents, and offers high efficiency in rapid dirt removal and sterilization.

[0003] Currently, commonly used nozzles are generally made into gun bodies, with steam pipes inside the gun bodies. Steam release switches (valve bodies) are installed on the steam pipes, and the handles on the gun bodies control the steam release switches, thereby controlling the steam injection.

[0004] A prior art example, referring to patent document CN204051982U, discloses a nozzle for a steam cleaner, including a gun body with a steam release switch inside the gun body. A wrench for controlling the steam release switch is pivotally connected to the gun body. The nozzle also includes a locking switch with a locking wrench. The locking switch includes a push switch and a push switch. The push switch includes a push rod extending from inside the gun body to outside the gun body. The push rod can move along the extension direction and maintains a tendency to move outward. A first stop block is provided on the side of the push rod. The push switch includes a push part protruding outside the gun body. A stop part is provided at the bottom of the push part. A first notch that cooperates with the first stop block is opened on one side of the stop part. A second stop block is provided at the bottom of the other side of the stop part. A third stop block is provided on the side of the wrench facing the steam release switch. The second stop block and the third stop block are at least partially staggered and abut against each other in the direction in which the wrench presses the steam release switch. The second stop block can be displaced from the third stop block as the push part moves.

[0005] The above-mentioned technical examples and existing technologies have similar functional shortcomings, such as: 1. Steam on / off is achieved through a wrench, but the reset mechanism is not disclosed. In most products, the reset spring acts directly on the wrench, and the wrench then drives the valve to close to stop steam output during the reset process. However, this is an indirect force on the valve. Therefore, when there is a transmission failure between the valve and the wrench, the wrench may reset, but the valve may not close, thus failing to stop steam output and posing a safety risk. 2. Some valves use built-in reset springs to achieve the function of automatic closure after use. However, these valves require steam to flow inside, and the reset springs are mostly made of metal. High-temperature steam can cause mechanical degradation, chemical corrosion, and thermal fatigue damage to the metal reset springs, leading to valve malfunction or failure. Summary of the Invention

[0006] In order to overcome the above-mentioned shortcomings of the prior art, the present invention provides a spray gun accessory for a steam cleaning equipment.

[0007] The technical solution of this utility model to solve its technical problem is: a spray gun accessory for a steam cleaning device, comprising:

[0008] The spray gun housing has an internal mounting cavity, with one end of the spray gun housing being the steam inlet end and the other end being the steam outlet end;

[0009] A nozzle tube is disposed in the mounting cavity, and the front end of the nozzle tube extends out of the spray gun housing through the steam outlet end;

[0010] A steam inlet pipe, which is disposed at the steam inlet end;

[0011] A conduit connecting the nozzle pipe and the steam inlet pipe;

[0012] A trigger switch, which is rotatably connected to the spray gun housing;

[0013] An on / off valve is movably disposed in a nozzle tube, and the on / off valve is driven to a trigger switch such that the on / off valve has at least a fully open position and a fully closed position.

[0014] It also includes a tension spring, the front end of which is connected to the nozzle tube and the rear end of which is connected to the on / off valve.

[0015] Compared with existing technologies, the above-mentioned technical solution has the following structural features and advantages: First, the tension spring acts directly on the opening and closing valve. Once the user releases the trigger switch, the opening and closing valve can directly switch to the fully closed position under the elastic restoring force of the tension spring. Therefore, even if the transmission between the opening and closing valve and the trigger switch is obstructed, the opening and closing valve can still be reset to stop steam output and ensure safe use. Second, the tension spring and the opening and closing valve are separately set, that is, the tension spring is not inside the opening and closing valve. Therefore, the tension spring will not come into contact with high-temperature steam, which can completely avoid defects such as mechanical property degradation, chemical corrosion, and thermal fatigue damage caused by high-temperature steam. Third, the tension spring is set outside the opening and closing valve, which simplifies the assembly process, facilitates installation and operation, and improves structural stability.

[0016] Regarding the structural relationship between the trigger switch and the on / off valve, it is preferred that: the trigger switch is provided with a groove, the on / off valve has a valve body and a transmission end, and the transmission end is installed in the groove so that the trigger switch and the on / off valve form a transmission engagement.

[0017] Preferably, the opening and closing valve is T-shaped, and the valve body and the transmission end are arranged perpendicular to each other;

[0018] The transmission end has a dividing rib that divides the groove into a first section and a second section. The first section is inserted into the groove on the trigger switch, and the rear end of the tension spring is connected to the second section.

[0019] On the other hand, the outer wall of the nozzle tube is provided with a support rib, and a support groove is opened on the support rib, and the front end of the tension spring is connected to the support groove.

[0020] In a preferred embodiment of the present invention, the nozzle pipe has a steam delivery section, a first interface section, and a second interface section, and a steam delivery port is provided between the steam delivery section, the first interface section, and the second interface section;

[0021] The opening and closing valve is located in the first interface section;

[0022] The catheter is connected to and conducts through the second interface section;

[0023] When the on / off valve is in the fully open position, the steam outlet is released so that the steam transmission section and the second interface section are interconnected.

[0024] When the opening and closing valve is in the fully closed position, the opening and closing valve blocks the steam outlet, so that the steam transmission section and the second interface section are mutually blocked.

[0025] In a preferred embodiment of this utility model, the on / off valve is provided with a front sealing ring and a rear sealing ring.

[0026] When the valve is in the fully closed position, the front sealing ring is located on the front side of the steam inlet and forms a sealing fit with the inner wall of the first interface section, and the rear sealing ring is located on the rear side of the steam inlet and forms a sealing fit with the inner wall of the first interface section.

[0027] In a preferred embodiment of this utility model, a safety switch is further provided on the spray gun housing, and the safety switch can abut against the trigger switch and form a stop engagement.

[0028] The safety switch includes a limiting part and an operating part. The operating part extends out of the spray gun housing, and the limiting part is located in the mounting cavity. The limiting part is rotatably connected to the spray gun housing via a first rotating shaft.

[0029] The limiting part has a limiting rib, and the limiting rib forms a switch stroke with the trigger switch.

[0030] Furthermore, the safety switch has a closed position, a low flow rate position, and a high flow rate position, and the opening and closing valve also has a partially open position state.

[0031] When the safety switch is in the off position, the corresponding opening and closing valve is in the fully closed position.

[0032] When the safety switch is in the low flow rate position, the opening and closing valve is in the partially open position.

[0033] When the safety switch is in the high flow rate setting, the corresponding opening and closing valve is in the fully open position.

[0034] More specifically, the safety switch also includes a spring stop, which has a plurality of position slots. The spring stop is disposed on the outer periphery of the limiting part along the rotation direction, and a movable gap is formed between the spring stop and the limiting part.

[0035] The spray gun housing is provided with a positioning block, which can be engaged into any one of the gear slots.

[0036] In this invention, the trigger switch is rotatably connected to the spray gun housing via a second rotating shaft, and the length of the groove is greater than the radial dimension of the transmission end, so that the transmission end can move relative to the groove.

[0037] The beneficial effects of this utility model are as follows:

[0038] 1. The tension spring acts directly on the opening and closing valve. Once the user releases the trigger switch, the valve can directly switch to the fully closed position under the elastic restoring force of the tension spring. Therefore, even if the transmission between the opening and closing valve and the trigger switch is obstructed, the valve can still be reset to stop steam output and ensure safe operation.

[0039] Second, the tension spring and the opening and closing valve are set separately, that is, the tension spring is not inside the opening and closing valve. Therefore, the tension spring will not come into contact with high-temperature steam, which can completely avoid defects such as mechanical property degradation, chemical corrosion, and thermal fatigue damage caused by high-temperature steam.

[0040] Third, the tension spring is placed outside the opening and closing valve, which simplifies the assembly process, makes installation and operation easier, and improves structural stability. Attached Figure Description

[0041] Figure 1 This is a schematic diagram and a partial enlarged view of the structure of this utility model.

[0042] Figure 2 This is a schematic diagram of the internal structure of this utility model.

[0043] Figure 3 This is an exploded view of this utility model.

[0044] Figure 4 This is an assembly diagram of the nozzle tube, trigger switch, and tension spring.

[0045] Figure 5 This is a cross-sectional view of the present invention.

[0046] Figure 6 yes Figure 5 An enlarged schematic diagram of part A in the middle.

[0047] Figure 7 This is a partial schematic diagram of the valve in the fully open position.

[0048] Figure 8 This is a partial schematic diagram of the valve in a partially open position.

[0049] Figure 9 This is a partial schematic diagram of the valve in the fully closed position.

[0050] Figure 10 This is a schematic diagram of the opening and closing valve.

[0051] Figure 11 This is a schematic diagram of the nozzle tube.

[0052] In the diagram: 1. Spray gun housing; 11. Mounting cavity; 12. Steam inlet end; 13. Steam outlet end; 14. Positioning block; 2. Nozzle pipe; 21. Steam delivery section; 22. First interface section; 23. Second interface section; 24. Support rib; 241. Support groove; 25. Steam outlet; 3. Steam inlet pipe; 4. Guide pipe; 5. Trigger switch; 51. Groove; 51L. Length dimension of the groove; 52. Second rotating shaft; 6. On / off valve; 6a. Fully open position; 6b. Fully closed position; 6c. Partially open position; 61. Valve 62. Transmission end; 62L. Radial dimension of transmission end; 621. First section; 622. Second section; 63. Separating rib; 64. Front sealing ring; 65. Rear sealing ring; 7. Tension spring; 71. Front end of tension spring; 72. Rear end of tension spring; 8. Safety switch; 81. Limiting part; 811. First rotating shaft; 812. Limiting rib; 82. Operating part; 8D. Switch stroke; 8a. Closed position; 8b. Small flow position; 8c. Large flow position; 83. Spring-loaded part; 831. Position groove; 83D. Movement clearance. Detailed Implementation

[0053] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that the embodiments are merely specific descriptions of the present invention, and their purpose is to enable those skilled in the art to better understand the technical solution of the present invention, and should not be regarded as limitations on the present invention.

[0054] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.

[0055] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0056] Example 1

[0057] Reference Figures 1 to 11A spray gun accessory for a steam cleaning device includes: a spray gun housing 1 having an internal mounting cavity 11, one end of the spray gun housing 1 being a steam inlet end 12 and the other end being a steam outlet end 13; a nozzle pipe 2 disposed in the mounting cavity 11, with the front end of the nozzle pipe 2 extending out of the spray gun housing 1 through the steam outlet end 13; a steam inlet pipe 3 disposed at the steam inlet end 12 for connecting to a steam generator; a conduit 4 connecting the nozzle pipe 2 and the steam inlet pipe 3; a trigger switch 5 rotatably connected to the spray gun housing 1; an on / off valve 6 movably disposed in the nozzle pipe 2, the on / off valve 6 and the trigger switch 5 forming a transmission engagement such that the on / off valve 6 has at least a fully open position state 6a and a fully closed position state 6b; and a tension spring 7, the front end of the tension spring 7 being connected to the nozzle pipe 2 and the rear end being connected to the on / off valve 6.

[0058] Compared with existing technologies, the above-mentioned technical solution has the following structural features and advantages: First, the tension spring 7 acts directly on the opening and closing valve 6. Once the user releases the trigger switch 5, the opening and closing valve 6 can directly switch to the fully closed position 6b under the elastic restoring force of the tension spring 7. Therefore, even if the transmission between the opening and closing valve 6 and the trigger switch 5 is obstructed, the opening and closing valve 6 can still be reset to stop steam output and ensure safe use. Second, the tension spring 7 and the opening and closing valve 6 are separately set, that is, the tension spring 7 is not inside the opening and closing valve 6. Therefore, the tension spring 7 will not come into contact with high-temperature steam, which can completely avoid defects such as mechanical property degradation, chemical corrosion, and thermal fatigue damage caused by high-temperature steam. Third, the tension spring 7 is set outside the opening and closing valve 6, which simplifies the assembly process, facilitates installation and operation, and improves structural stability.

[0059] Regarding the structural relationship between the trigger switch 5 and the on / off valve 6, the preferred configuration is as follows: (Refer to...) Figure 4 , Figures 7-9 The trigger switch 5 is provided with a groove 51, and the on / off valve 6 has a valve body 61 and a transmission end 62. The transmission end 62 is installed in the groove 51 so that the trigger switch 5 and the on / off valve 6 form a transmission engagement.

[0060] Optionally, refer to Figure 10The opening and closing valve 6 is T-shaped, and the valve body 61 and the transmission end 62 are arranged perpendicular to each other. The transmission end 62 has a dividing rib 63, which divides the groove 51 into a first section 621 and a second section 622. The first section 621 is engaged in the groove 51 on the trigger switch 5, and the rear end of the tension spring 7 is connected to the second section 622. Through the action of the dividing rib 63, the groove 51 is divided into sections, with the first section 621 and the second section 622 corresponding to the groove 51 and the tension spring 7, respectively, preventing structural interference (e.g., the tension spring 7 will not enter the first section 621) and ensuring the normal operation of each function. On the other hand, the outer wall of the nozzle tube 2 is provided with a support rib 24, and the support rib 24 has a support groove 241, with the front end of the tension spring 7 connected to the support groove 241. Therefore, the front end of the tension spring 7 is a fixed end, and the rear end of the tension spring 7 is a movable end. When the trigger switch 5 is pulled, the rear end of the tension spring 7 is stretched backward and accumulates forward elastic tension. Once the user releases the trigger switch 5, the switch valve can be driven forward and reset under the action of elastic tension.

[0061] Reference Figure 6 In this utility model, the trigger switch 5 is rotatably connected to the spray gun housing 1 via the second rotating shaft 52. The length dimension of the groove 51 is greater than the radial dimension of the transmission end 62, so that the transmission end 62 can move relative to the groove 51, effectively adapting to the movement trajectory of the transmission end 62 (opening and closing valve 6), so as to ensure that the trigger switch 5 and the opening and closing valve 6 have a more reliable cooperation relationship.

[0062] Reference Figure 4 Preferably, there are two tension springs 7 symmetrically distributed on the two sides of the opening and closing valve 6, so that the force on the opening and closing valve 6 is more balanced and its reset movement is more in place.

[0063] Example 2

[0064] Reference Figure 11 In a preferred embodiment of this utility model, the nozzle pipe 2 has a steam delivery section 21, a first interface section 22, and a second interface section 23, and a steam delivery port 25 is provided between the steam delivery section 21, the first interface section 22, and the second interface section 23; wherein, the on / off valve 6 is disposed in the first interface section 22; and the conduit 4 is connected to and conducts through the second interface section 23.

[0065] Reference Figures 7-9 The working principle of this embodiment is as follows:

[0066] When the on / off valve 6 is in the fully open position 6a, the steam outlet 25 is released so that the steam delivery section 21 and the second interface section 23 are interconnected, that is, the steam inlet pipe 3, the conduit 4, and the nozzle pipe 2 are connected in sequence, and steam is ejected forward from the nozzle pipe 2.

[0067] When the on / off valve 6 is in the fully closed position 6b, it blocks the steam outlet 25, thus isolating the steam delivery section 21 from the second interface section 23. Steam enters the second interface section 23 of the nozzle pipe 2 through the steam inlet pipe 3 and the conduit 4, but because the steam outlet 25 is blocked, steam will not enter the steam delivery section 21, completely preventing steam from being ejected forward from the nozzle pipe 2.

[0068] Regarding the sealing structure for the on / off function of the opening / closing valve 6, it is preferable that the opening / closing valve 6 is provided with a front sealing ring 64 and a rear sealing ring 65. The working principle of the front sealing ring 64 and the rear sealing ring 65 is as follows: when the opening / closing valve 6 is in the fully closed position 6b, the front sealing ring 64 is located on the front side of the steam inlet 25 and forms a sealing fit with the inner wall of the first interface section 22, and the rear sealing ring 65 is located on the rear side of the steam inlet 25 and forms a sealing fit with the inner wall of the first interface section 22.

[0069] Example 3

[0070] Based on the structural scheme of any of the foregoing embodiments, this embodiment provides a safety structure (commonly referred to as a child lock structure), as follows:

[0071] Reference Figure 1 , Figure 6 The spray gun housing 1 is also provided with a safety switch 8, which can abut against the trigger switch 5 and form a stop engagement. The safety switch 8 includes a limiting part 81 and an operating part 82. The operating part 82 extends out of the spray gun housing 1, and the limiting part 81 is located in the mounting cavity 11 and is rotatably connected to the spray gun housing 1 through a first rotating shaft 811. The limiting part 81 has a limiting rib 812, and the limiting rib 812 forms a switch stroke 8D with the trigger switch 5.

[0072] The working principle of safety switch 8 is as follows: When safety switch 8 is not unlocked, the switch stroke 8D is small or 0, so when the user squeezes trigger switch 5, trigger switch 5 cannot be moved successfully. Therefore, the opening / closing valve 6 will not move and will remain in the fully closed position 6b to prevent steam from escaping and to prevent accidental operation, thus providing a safety protection (child lock) function. When safety switch 8 is unlocked, the switch stroke 8D is released (larger), so when the user squeezes trigger switch 5, trigger switch 5 will be moved successfully. This causes the opening / closing valve 6 to be driven by trigger switch 5 and switched to the open position (fully open position 6a), allowing steam to be ejected forward for steam cleaning.

[0073] Conventionally, spray gun accessories only have two states: open and closed. However, users face different usage environments. To enrich functionality, the preferred structure is as follows: the safety switch 8 has a closed position 8a, a low flow rate position 8b, and a high flow rate position 8c, and the on / off valve 6 also has a partially open position 6c. The specific working principle is as follows:

[0074] When the safety switch 8 is in the closed position 8a, the on / off valve 6 is in the fully closed position 6b; when the safety switch 8 is in the low flow position 8b, the on / off valve 6 is in the partially open position 6c; when the safety switch 8 is in the high flow position 8c, the on / off valve 6 is in the fully open position 6a. The switch stroke 8D in the partially open position 6c is between that in the fully open position 6a and the fully closed position 6b.

[0075] Therefore, users can choose to use either the low flow rate setting 8b or the high flow rate setting 8c according to their actual cleaning needs.

[0076] Optionally, the safety switch 8 further includes a spring stop portion 83, which has several position slots 831. The spring stop portion 83 is disposed on the outer periphery of the limiting portion 81 along the rotation direction, and a movable gap 83D is formed between the spring stop portion 83 and the limiting portion 81 (to provide space for the spring stop portion 83 to work). The spray gun housing 1 is provided with a positioning block 14, which can be engaged into any one of the position slots 831. Through the cooperation of the positioning block 14 and each position slot 831, the safety switch 8 can maintain a relatively stable position after switching positions, that is, the safety switch 8 will not be accidentally switched to other positions under non-human operation. On the other hand, the setting of the spring stop portion provides the user with a clear damping feel when switching, making the operation feel better.

[0077] It is worth noting that the other technical solutions of this utility model are all existing technologies, and therefore will not be described in detail.

[0078] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the concept of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A spray gun accessory for a steam cleaning device, comprising: The spray gun housing (1) has an internal mounting cavity (11), one end of the spray gun housing (1) is the steam inlet end (12), and the other end is the steam outlet end (13); The nozzle tube (2) is disposed in the mounting cavity (11), and the front end of the nozzle tube (2) extends out of the spray gun housing (1) through the steam outlet end (13); Steam inlet pipe (3), which is disposed at the steam inlet end (12); A conduit (4) is connected between the nozzle pipe (2) and the steam inlet pipe (3); A trigger switch (5) is rotatably connected to the spray gun housing (1); An on / off valve (6) is movably disposed in a nozzle tube (2), the on / off valve (6) being driven to a trigger switch (5) such that the on / off valve (6) has at least a fully open position (6a) and a fully closed position (6b). Its features are: It also includes a tension spring (7), the front end of which is connected to the nozzle tube (2) and the rear end is connected to the on / off valve (6).

2. The spray gun accessory for the steam cleaning equipment according to claim 1, characterized in that: The trigger switch (5) is provided with a groove (51), and the on / off valve (6) has a valve body (61) and a transmission end (62). The transmission end (62) is installed in the groove (51) so that the trigger switch (5) and the on / off valve (6) form a transmission engagement.

3. The spray gun accessory for steam cleaning equipment according to claim 2, characterized in that: The opening and closing valve (6) is T-shaped, and the valve body (61) and the transmission end (62) are arranged perpendicular to each other; The transmission end (62) has a partition rib (63) that divides the groove (51) into a first section (621) and a second section (622). The first section (621) is inserted into the groove (51) on the trigger switch (5), and the rear end of the tension spring (7) is connected to the second section (622).

4. The spray gun accessory for steam cleaning equipment according to claim 2, characterized in that: The outer wall of the nozzle tube (2) is provided with a support rib (24), and a support groove (241) is provided on the support rib (24). The front end of the tension spring (7) is connected to the support groove (241).

5. The spray gun accessory for the steam cleaning equipment according to claim 1, characterized in that: The nozzle pipe (2) has a steam delivery section (21), a first interface section (22) and a second interface section (23), and a steam delivery port (25) is provided between the steam delivery section (21), the first interface section (22) and the second interface section (23); The opening and closing valve (6) is disposed in the first interface section (22); The catheter (4) is connected to and conducts through the second interface section (23); When the on / off valve (6) is in the fully open position (6a), the steam inlet (25) is released so that the steam transmission section (21) and the second interface section (23) are connected to each other. When the on / off valve (6) is in the fully closed position (6b), the on / off valve (6) blocks the steam inlet (25) so that the steam delivery section (21) and the second interface section (23) are mutually blocked.

6. The spray gun accessory for the steam cleaning equipment according to claim 5, characterized in that: The opening and closing valve (6) is provided with a front sealing ring (64) and a rear sealing ring (65). When the on / off valve (6) is in the fully closed position (6b), the front sealing ring (64) is located on the front side of the steam inlet (25) and forms a sealing fit with the inner wall of the first interface section (22), and the rear sealing ring (65) is located on the rear side of the steam inlet (25) and forms a sealing fit with the inner wall of the first interface section (22).

7. The spray gun accessory for the steam cleaning equipment according to claim 1, characterized in that: The spray gun housing (1) is also provided with a safety switch (8), which can abut against the trigger switch (5) and form a stop engagement; The safety switch (8) includes a limiting part (81) and an operating part (82). The operating part (82) extends out of the spray gun housing (1). The limiting part (81) is located in the mounting cavity (11) and is rotatably connected to the spray gun housing (1) via a first rotating shaft (811). The limiting part (81) has a limiting rib (812), and the limiting rib (812) forms a switch stroke (8D) with the trigger switch (5).

8. The spray gun accessory for steam cleaning equipment according to claim 7, characterized in that: The safety switch (8) has a closed position (8a), a small flow position (8b) and a large flow position (8c), and the on / off valve (6) also has a partially open position state (6c). When the safety switch (8) is in the closed position (8a), the opening and closing valve (6) is in the fully closed position (6b). When the safety switch (8) is in the low flow rate position (8b), the opening and closing valve (6) is in the partially open position (6c). When the safety switch (8) is in the high flow rate position (8c), the opening and closing valve (6) is in the fully open position (6a).

9. The spray gun accessory for steam cleaning equipment according to claim 7, characterized in that: The safety switch (8) further includes a spring stop (83), which has a plurality of stop slots (831). The spring stop (83) is arranged on the outer periphery of the limiting part (81) along the rotation direction, and an active gap (83D) is formed between the spring stop (83) and the limiting part (81). The spray gun housing (1) is provided with a positioning block (14), which can be inserted into any one of the gear slots (831).

10. The spray gun accessory for the steam cleaning equipment according to claim 2, characterized in that: The trigger switch (5) is rotatably connected to the spray gun housing (1) via the second rotating shaft (52). The length of the groove (51) is greater than the length of the transmission end (62) so that the transmission end (62) can move relative to the groove (51).

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