Indoor unit of air conditioner

Abstract

The utility model provides an indoor unit of an air conditioner. The air conditioner indoor unit comprises a machine shell, a flow guide cover and a sub-machine. A first containing cavity is defined in the machine shell. The flow guide cover is fixedly arranged in the first containing cavity and comprises a wind shield and an air inducing cover, and the wind shield and the air inducing cover define a second containing cavity. The sub-machine is separably installed in the second accommodating cavity. The sub-machine comprises an air inlet and a first air outlet. Grid holes are formed in the positions, facing the air inlets, of the air baffles. The air inducing cover is arranged on the outer side of the first air outlet in a covering mode and provided with an air outlet channel communicating with the first air outlet. The wind shield plays a role in shielding the rear side of the first containing cavity, the situation that the interior of the machine shell is collided or even damaged due to exposure of the machine shell is avoided, the interior of the second containing cavity is neat and attractive, and the user experience is improved. And moreover, grating holes are formed in the position, facing the air inlet of the sub-machine, of the air baffle, and when the sub-machine is installed in the second containing cavity, air inlet of the sub-machine is not affected.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an indoor unit of an air conditioner. Background Art

[0002] As user demands increase, the functions of air conditioners on the market are diversified. To solve the shortcomings of multifunctional air conditioner indoor units that occupy a large space, are relatively fixed in position, and cannot flexibly supply air, existing air conditioner indoor units are provided with air conditioner sub-units that can be separated from the installation space of the air conditioner indoor unit.

[0003] However, after the sub-unit is pulled out, the casing of the indoor unit of the air conditioner defined in the installation space is exposed, making the interior of the casing vulnerable to bumps or even damage, and there is also the problem of unsightly installation space, affecting user experience. Utility Model Content

[0004] In view of the above-mentioned problems, the utility model is proposed to provide an air conditioner indoor unit that overcomes the above-mentioned problems or at least partially solves the above-mentioned problems. It can solve the problem that after the sub-unit is pulled out, the casing of the air conditioner indoor unit at the rear side of the installation space is exposed, making the interior of the casing vulnerable to bumps or even damage, and there is also the problem of unsightly appearance in the installation space, thereby achieving the purpose of improving user experience.

[0005] Specifically, the utility model provides an air conditioner indoor unit comprising:

[0006] A casing defines a first accommodating cavity therein.

[0007] The air deflector is fixedly disposed in the first accommodating cavity. The air deflector comprises a wind shield and an air induction hood. The wind shield and the air induction hood define a second accommodating cavity.

[0008] The sub-unit is detachably mounted in the second accommodating cavity. The sub-unit includes an air inlet and a first air outlet.

[0009] The wind shield is provided with grille holes toward the air inlet. The air induction cover is provided on the outside of the first air outlet, and the air induction cover is provided with an air outlet channel connected to the first air outlet.

[0010] Optionally, the air deflector is an integrally formed structure.

[0011] Optionally, the windshield is in a U-shape with its opening facing forward, and the sub-machine enters and exits the second accommodating cavity from the front opening of the windshield.

[0012] The air inlet is at least located at the rear side of the sub-unit.

[0013] Optionally, the air inlets are arranged on the side walls on the left and right sides of the sub-machine.

[0014] The side walls on the left and right sides of the wind shield are provided with grille holes corresponding to the air inlet.

[0015] Optionally, the first air outlet is located on the upper side of the sub-unit.

[0016] The peripheral edge of the air induced cover extends downward to form a first flange, and the lower edge of the first flange is connected to the upper edge of the wind shield.

[0017] Optionally, both sides of the front end of the windshield are provided with second flanges extending away from the sub-machine. The lower side of each second flange is provided with a mounting plate extending forward, and the mounting plate is provided with a connecting hole.

[0018] The housing is provided with connecting posts corresponding to the connecting holes.

[0019] Optionally, two mounting blocks are provided at the upper end of the induced draft hood, the two mounting blocks are respectively provided at the left and right sides of the induced draft hood, and the two mounting blocks are both fixedly connected to the casing.

[0020] An air outlet channel is formed in each of the installation blocks.

[0021] Optionally, the housing comprises two front support columns and a rear plate, and the first accommodating cavity is formed between the two front support columns and the rear plate. Front ends of the two mounting blocks are respectively fixedly connected to one of the front support columns.

[0022] Optionally, a second air outlet connected to the air outlet channel is formed on the housing.

[0023] Optionally, the housing comprises a bottom plate, and the bottom plate is located at the lower side of the first accommodating cavity. A slideway is arranged on the bottom plate.

[0024] A roller is provided at the bottom of the sub-machine, and the sub-machine is configured to move along the slideway through the roller to change the position of the sub-machine.

[0025] A guide groove is extended forward at the front end of the slideway, and the opening at the front end of the guide groove is larger than the opening at the rear end.

[0026] In the indoor unit of the air conditioner of the utility model, the wind shield is located between the sub-unit and the casing. When the sub-unit is outside the second accommodating chamber, the wind shield shields the rear of the first accommodating chamber, thereby preventing the interior of the casing from being bumped or even damaged due to the exposure of the casing, and making the interior of the second accommodating chamber neat and beautiful, thereby improving the user experience. Moreover, the wind shield is provided with a grille hole facing the air inlet of the sub-unit, so that when the sub-unit is installed in the second accommodating chamber, the air intake of the sub-unit is not affected.

[0027] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0029] Figure 1 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the utility model;

[0030] Figure 2 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the utility model;

[0031] Figure 3 is a schematic partial structural diagram of an indoor unit of an air conditioner according to an embodiment of the utility model;

[0032] Figure 4 is a schematic structural diagram of a sub-unit in an indoor unit of an air conditioner according to an embodiment of the utility model;

[0033] Figure 5 It is a schematic structural diagram of a flow guide cover in an indoor unit of an air conditioner according to an embodiment of the utility model;

[0034] Figure 6 It is a schematic structural diagram of a flow guide cover in an indoor unit of an air conditioner according to an embodiment of the utility model;

[0035] Figure 7 The utility model is a schematic structural diagram of an air guide cover in an indoor unit of an air conditioner according to an embodiment of the utility model.

[0036] List of reference numerals: 100, casing; 110, front support column; 120, rear plate; 130, second air outlet; 140, bottom plate; 141, slide; 142, guide groove; 150, first accommodating chamber; 200, air deflector; 210, wind shield; 211, grille hole; 212, second flange; 213, mounting plate; 214, mounting column; 220, air duct; 221, first flange; 230, mounting block; 231, air outlet channel; 240, second accommodating chamber; 300, sub-unit; 310, air inlet; 320, first air outlet. DETAILED DESCRIPTION

[0037] Refer to the following Figures 1 to 7To describe the air conditioner indoor unit of an embodiment of the present utility model. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0038] Unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix", "couple" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in the present utility model according to the specific circumstances.

[0039] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. That is, in the description of this embodiment, the first feature being "above", "above", and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below", or "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0040] In the description of the present embodiment, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0041] Figure 1 is a schematic structural diagram of an indoor unit of an air conditioner according to an embodiment of the utility model, such as Figure 1 As shown, and refer to Figures 2 to 7 The embodiment of the utility model provides an indoor unit of an air conditioner including a casing 100, a duct 200 and a sub-unit 300.

[0042] The housing 100 defines a first accommodating chamber 150. The air deflector 200 is fixedly disposed in the first accommodating chamber 150. The air deflector 200 includes a wind shield 210 and a wind induction cover 220. The wind shield 210 and the wind induction cover 220 define a second accommodating chamber 240. The sub-unit 300 is detachably installed in the second accommodating chamber 240. The sub-unit 300 includes an air inlet 310 and a first air outlet 320.

[0043] The wind shield 210 is provided with a grille hole 211 facing the air inlet 310. The air induction cover 220 is provided on the outside of the first air outlet 320, and the air induction cover 220 is provided with an air outlet channel 231 connected to the first air outlet 320.

[0044] In this embodiment, the air guide cover 200 is in the first accommodating chamber 150 defined by the housing 100, and the sub-machine 300 is in the second accommodating chamber 240 defined by the air guide cover 200. When the sub-machine 300 needs to be used alone, the sub-machine 300 is taken out from the second accommodating chamber 240, and the position of the sub-machine 300 can be adjusted according to the needs of the user. When the whole machine needs to be used, the sub-machine 300 is installed in the second accommodating chamber 240. The airflow enters from the air inlet 310 of the sub-machine 300, and then blows out from the first air outlet 320 of the sub-machine 300 toward the direction of the air guide cover 220, and then the airflow is guided by the air outlet channel 231 through the housing 100 and enters the room. Further, a humidifying device or a purification device can be set in the sub-machine 300, so that the airflow blown out from the sub-machine 300 is a humidified airflow or a purified airflow.

[0045] The windshield 210 is located between the sub-unit 300 and the housing 100. When the sub-unit 300 is located outside the second accommodating chamber 240, the windshield 210 shields the rear of the first accommodating chamber 150, thereby preventing the interior of the housing 100 from being bumped or even damaged due to the exposure of the housing 100. Moreover, the arrangement of the windshield 210 also makes the interior of the second accommodating chamber 240 neat and beautiful, thereby improving the user experience. Moreover, the windshield 210 is provided with a grille hole 211 at the air inlet 310 of the sub-unit 300, so as not to affect the air intake of the sub-unit 300 when the sub-unit 300 is installed in the second accommodating chamber 240.

[0046] In some embodiments of the present invention, Figure 3 As shown, a second air outlet 130 communicating with the air outlet channel 231 is formed on the housing 100 .

[0047] In this embodiment, the airflow enters from the air inlet 310 of the sub-unit 300, and is blown out from the first air outlet 320 of the sub-unit 300 toward the air hood 220, and then the airflow is guided by the air outlet channel 231 through the second air outlet 130 into the room.

[0048] Furthermore, a filter is provided at the second air outlet 130 , which not only filters the airflow entering the room, but also prevents debris or flying insects from entering the air outlet channel 231 .

[0049] In some embodiments of the present invention, Figure 5 or Figure 6 As shown, the air deflector 200 is an integrally formed structure.

[0050] In this embodiment, the wind shield 210 and the air duct cover 220 are an integrally formed structure, and multiple parts do not need to be installed when installing the air duct cover 200 in the first accommodating cavity 150, which simplifies the difficulty of installing the air duct cover 200 in the first accommodating cavity 150.

[0051] Moreover, the one-piece structure makes the inside of the second accommodating cavity 240 neater, avoiding bumps when the air conditioner is installed in the second accommodating cavity 240, thereby improving the quality of the indoor unit of the air conditioner and enhancing the user experience.

[0052] In some embodiments of the present invention, Figure 5 or Figure 6 As shown, the windshield 210 is in a U-shape with its opening facing forward, and the slave unit 300 enters and exits the second accommodating cavity 240 from the front opening of the windshield 210. The air inlet 310 is at least located at the rear side of the slave unit 300.

[0053] In this embodiment, the windshield 210 is U-shaped. When the sub-machine 300 is installed in the second accommodating cavity 240, the windshield 210 surrounds the sub-machine 300 from three directions, which can better protect the sub-machine 300 and reduce the exposed area of ​​the housing 100, thereby protecting the housing 100 and preventing the interior of the housing 100 from being bumped or even damaged due to the exposure of the housing 100. The air inlet 310 is located at the rear side of the sub-machine 300, and a grille is provided at the rear side of the windshield 210 at a corresponding position toward the air inlet 310 to ensure normal air intake of the sub-machine 300.

[0054] Further, in some embodiments of the present invention, Figure 4 As shown, the side walls on the left and right sides of the slave unit 300 are provided with air inlets 310 . The side walls on the left and right sides of the windshield plate 210 are provided with grille holes 211 corresponding to the air inlets 310 .

[0055] In this embodiment, the rear side and the left and right sides of the slave unit 300 simultaneously take in air, which increases the air intake of the slave unit 300 and further improves the air discharge efficiency of the slave unit 300. A grille is provided at a corresponding position of the wind shield 210 toward the air inlet 310 to ensure normal air intake of the slave unit 300.

[0056] In some embodiments of the present invention, Figure 2 or Figure 4 As shown, the first air outlet 320 is located on the upper side of the sub-machine 300. The peripheral edge of the air induction cover 220 extends downward to form a first flange 221. The lower edge of the first flange 221 is connected to the upper edge of the wind shield 210.

[0057] In this embodiment, the peripheral edge of the hood 220 extends downward to form a first flange 221, which reduces the amount of air flowing out from the peripheral side of the hood 220 after the air is blown out from the air outlet of the sub-unit 300 toward the hood 220, thereby increasing the amount of air flowing into the room from the air outlet channel 231, thereby improving the air outlet efficiency of the sub-unit 300 into the room.

[0058] In some embodiments of the present invention, Figures 5 to 7 As shown, both sides of the front end of the windshield plate 210 are provided with second flanges 212 extending away from the sub-machine 300.

[0059] In this embodiment, the provision of the second flange 212 improves the strength of the overall structure of the wind shield 210 and reduces the deformation of the wind shield 210 .

[0060] Further, in some embodiments of the present invention, Figure 5 As shown, a mounting plate 213 extending forward is provided on the lower side of each second flange 212, and a connecting hole is provided on the mounting plate 213. The housing 100 is provided with a connecting column corresponding to the connecting hole. The connecting column is plugged into the connecting hole.

[0061] In this embodiment, the wind shielding plate 210 is fixedly connected to the housing 100 by connecting the connecting holes of the mounting plate 213 with the connecting posts.

[0062] In some embodiments of the present invention, Figures 5 to 7 As shown, two mounting blocks 230 are disposed on the upper end of the hood 220, and the two mounting blocks 230 are disposed on the left and right sides of the hood 220, respectively, and the two mounting blocks 230 are fixedly connected to the housing 100. Preferably, the two mounting blocks 230 and the hood 220 are an integrally formed structure.

[0063] Furthermore, an air outlet channel 231 is formed in each mounting block 230 .

[0064] In this embodiment, the mounting blocks 230 are located on the left and right sides of the induced draft hood 220 and extend toward the upper sides of the two sides of the induced draft hood 220. That is, on the horizontal projection plane, at least part of the two mounting blocks 230 is located outside the induced draft hood 220. The induced draft hood 220 is fixedly connected to the housing 100 via the two mounting blocks 230.

[0065] The mounting block 230 is a hollow structure, which connects the upper end and the lower end of the air hood 220. The end of the mounting block 230 close to the housing 100 is sealed and connected to the second air outlet 130, so that the air discharged by the sub-unit 300 flows out from the second air outlet 130. Preferably, a sealing ring is provided between the mounting block 230 and the second air outlet 130.

[0066] When the sub-machine 300 is installed in the second accommodating chamber 240 for operation, air flows in from the air inlet 310 of the sub-machine 300, and is blown out from the first air outlet 320 of the sub-machine 300 toward the air hood 220, and then enters the air outlet channel 231 formed in the mounting block 230, and is guided by the air outlet channel 231 to enter the room through the second air outlet 130 on the casing 100.

[0067] In some embodiments of the present invention, Figure 1 or Figure 2 As shown, the housing 100 includes two front support columns 110 and a rear plate 120, and the first accommodation cavity 150 is formed between the two front support columns 110 and the rear plate 120. The front ends of the two mounting blocks 230 are fixedly connected to one of the front support columns 110, respectively.

[0068] In this embodiment, the first accommodating cavity 150 is located between the front support column 110 and the rear plate 120 , and the front support column 110 and the rear plate 120 play a role in protecting and supporting the air duct 200 installed in the first accommodating cavity 150 .

[0069] The front end of the mounting block 230 extends downward from the second air outlet 130 to the lower side of the air duct 220, so that the front end area of ​​the mounting block 230 is larger. The front end of the mounting block 230 is fixedly connected to the front support column 110 to improve the connection strength of the air duct 200.

[0070] Furthermore, the front end and the rear end of the mounting block 230 both extend downward from the second air outlet 130 to the lower side of the air hood 220 to improve the structural strength of the mounting block 230 .

[0071] In some embodiments of the present invention, Figure 6 As shown, a plurality of mounting posts 214 are disposed on the side of the windshield 210 away from the sub-machine 300. The mounting posts 214 are provided with threaded holes, and the mounting posts 214 are threadedly connected to the housing 100.

[0072] In this embodiment, a plurality of mounting posts 214 are provided on the peripheral side of the wind shield 210, and threaded holes are provided in the mounting posts 214 so that when the wind shield 210 is installed in the first accommodating cavity 150 in the casing 100, the wind shield 210 can be fixedly connected to the first accommodating cavity 150 by threaded connectors such as screws or bolts.

[0073] Preferably, there are four mounting posts 214. The windshield 210 is U-shaped with its opening facing forward, two mounting posts 214 are located on both side outer walls of the windshield 210, and the other two mounting posts 214 are located on the rear outer wall of the windshield 210 and are spaced apart from each other.

[0074] Furthermore, a plurality of reinforcing ribs are disposed on the circumference of each mounting column 214. The plurality of reinforcing ribs are triangular and evenly spaced on the circumference of the mounting column 214. Preferably, four reinforcing ribs are disposed on the circumference of each mounting column 214.

[0075] The reinforcing ribs and the mounting posts 214 are integrally formed on the wind shield 210 to reduce the number of parts when installing the wind shield 210 , thereby simplifying the installation steps of the wind shield 210 .

[0076] In some embodiments of the present invention, Figure 2 As shown, the housing 100 includes a bottom plate 140, and the bottom plate 140 is located at the lower side of the first accommodating cavity 150. A slideway 141 is provided on the bottom plate 140.

[0077] Rollers are provided at the bottom of the sub-machine 300 , and the sub-machine 300 is configured to move along the slideway 141 via the rollers to change the position of the sub-machine 300 .

[0078] In this embodiment, a roller is provided at the bottom of the sub-machine 300, and the sub-machine 300 is moved by sliding the roller, which reduces the difficulty of moving the sub-machine 300 and improves the user experience. The setting of the slide 141 limits the movement of the roller on the bottom plate 140. The sub-machine 300 is pushed into the second accommodating cavity 240 until the rear side of the slide 141 and the roller are blocked to stop the roller from continuing to move backward, so that the sub-machine 300 can be correctly installed in the second accommodating cavity 240, and the position of the sub-machine 300 does not need to be adjusted multiple times, which simplifies the way of installing the sub-machine 300 in the second accommodating cavity 240. Due to the blocking effect of the slide 141, the collision between the sub-machine 300 and the air guide cover 200 is also avoided, and the air guide cover 200 is prevented from being damaged due to the collision.

[0079] Further, in some embodiments of the present invention, Figure 2 As shown, a guide groove 142 extends forward from the front end of the slideway 141 , and the opening at the front end of the guide groove 142 is larger than the opening at the rear end.

[0080] In this embodiment, when the sub-machine 300 is pushed into the second accommodating cavity 240, the roller first enters the guide groove 142, and then enters the slideway 141 after passing through the guide groove 142. The opening of the front end of the guide groove 142 is larger than the rear end, so that when the sub-machine 300 is pushed in, it is not necessary to align the roller with the slideway 141, which increases the position where the sub-machine 300 can be pushed into the second accommodating cavity 240, simplifies the operation of pushing the sub-machine 300 into the second accommodating cavity 240, and improves the user experience.

[0081] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. An air conditioner indoor unit, characterized in that: include: A casing, wherein a first accommodating cavity is defined in the casing; A deflector, the deflector is fixedly disposed in the first accommodating cavity, the deflector comprises a wind shield and a wind induction hood, and the wind shield and the wind induction hood define a second accommodating cavity; A sub-unit, the sub-unit is detachably mounted in the second accommodating cavity; the sub-unit comprises an air inlet and a first air outlet; The wind shield is provided with grille holes toward the air inlet; the air induced cover is provided on the outside of the first air outlet, and the air induced cover is provided with an air outlet passage connected to the first air outlet.

2. The air conditioner indoor unit according to claim 1, characterized in that: The air guide cover is an integrally formed structure.

3. The air conditioner indoor unit according to claim 2, characterized in that: The windshield is in a U-shape with its opening facing forward, and the sub-machine enters and exits the second accommodating cavity through the front opening of the windshield; The air inlet is at least located at the rear side of the sub-unit.

4. The air conditioner indoor unit according to claim 3, characterized in that: The side walls on the left and right sides of the sub-machine are provided with the air inlets; The side walls on the left and right sides of the wind shield are provided with grille holes corresponding to the air inlet.

5. The air conditioner indoor unit according to claim 3, characterized in that: The first air outlet is located on the upper side of the sub-unit; The peripheral edge of the air ducting cover extends downward to form a first flange; the lower edge of the first flange is connected to the upper edge of the wind shield.

6. The indoor unit of the air conditioner according to claim 3, characterized in that: Both sides of the front end of the windshield are provided with second flanges extending away from the sub-machine; the lower side of each second flange is provided with a mounting plate extending forward, and the mounting plate is provided with a connecting hole; The housing is provided with connecting posts corresponding to the connecting holes.

7. The air conditioner indoor unit according to claim 3, characterized in that: Two mounting blocks are arranged at the upper end of the induced draft hood, and the two mounting blocks are arranged at the left and right sides of the induced draft hood respectively, and the two mounting blocks are fixedly connected to the housing; An air outlet channel is formed in each of the installation blocks.

8. The air conditioner indoor unit according to claim 7, characterized in that: The housing comprises two front support columns and a rear plate, the first accommodating cavity is formed between the two front support columns and the rear plate; the front ends of the two mounting blocks are respectively fixedly connected to one of the front support columns.

9. The air conditioner indoor unit according to claim 1, characterized in that: The housing is provided with a second air outlet connected to the air outlet channel.

10. The air conditioner indoor unit according to claim 1, characterized in that: The housing comprises a bottom plate, the bottom plate is located at the lower side of the first accommodating cavity; a slideway is provided on the bottom plate; A roller is provided at the bottom of the sub-machine, and the sub-machine is configured to move along the slideway by the roller to change the position of the sub-machine; A guide groove is extended forward at the front end of the slideway, and the opening at the front end of the guide groove is larger than the opening at the rear end.

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