Economizer and roof unit

Abstract

The invention relates to the technical field of air conditioning equipment, in particular to an economizer and a roof unit. The economizer mainly comprises a shell, a fresh air valve, an air return valve and a pressure relief valve. The inner space of the shell is divided into a fresh air cavity and an air return cavity through a partition plate. The pressure relief valve comprises a plurality of pressure relief plates, the pressure relief opening is provided with a first edge and a second edge, and the length of the first edge and the length of the second edge are integral multiples of the length of the pressure relief plates. The pressure relief valve is designed to be in a splicing form of a plurality of pressure relief plates, and the pressure relief valve is divided and re-spliced by setting a proper size relationship between the pressure relief plates and the pressure relief ports, so that the splicing mode can be flexibly adjusted according to the mounting direction of the economizer on the premise of not changing the main body structure of the shell, and the assembly efficiency is improved. Rapid switching between vertical installation and horizontal installation is achieved, the requirement for designing two sets of economizer structures or adding complex adapters for different installation directions is avoided, the production, transportation and installation cost is reduced, and meanwhile the reliability and working stability of the pressure relief valve are kept.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning equipment, in particular to an economizer and a rooftop machine. BACKGROUND

[0002] The air side economizer is a kind of air duct, air valve arrangement and automatic control system, which jointly act to enable the refrigeration system to supply outdoor air in mild or cold weather, thereby reducing or eliminating the need for mechanical cooling. Due to the energy-saving characteristics of the economizer, it has been increasingly applied at present. The air side economizer is mainly composed of a fresh air valve, a return air valve and a pressure relief valve. The fresh air valve is arranged in the fresh air cavity of the economizer and is used to control the fresh air volume entering the unit; the return air valve is arranged at the intersection position of the return air cavity of the economizer and the indoor cavity of the unit and is used to control the return air volume of the room; and the pressure relief valve is arranged at the intersection position of the return air cavity of the economizer and the outdoor side of the unit and is used to control the excess air discharged from the economizer and the unit to the outdoor.

[0003] The current economizer of the rooftop machine is mostly suitable for the rooftop machine of the down return air type, that is, it is suitable for vertical installation of the economizer. For the rooftop machine of the side return air type, the economizer needs to be installed horizontally. Due to the difference in structure and size, the size and structure of the economizer are often quite different, and the rotation direction of the pressure relief valve cannot work normally.

[0004] For the rooftop machine which needs to adopt different installation directions of the economizer, either a separate horizontal installation economizer structure and a vertical installation economizer structure are designed, or a complex adapter structure is added, or the economizer is externally arranged. Although the above schemes can solve the problem of installation of the economizer, they are time-consuming and laborious and increase the economic and installation time cost of the user. SUMMARY

[0005] In order to solve the above technical problems, the present application provides an economizer and a rooftop machine.

[0006] According to a first aspect of the present application, the present application provides an economizer, which comprises:

[0007] a housing, an inner space of the housing is divided into a fresh air cavity and a return air cavity arranged along a first direction by a partition plate, the fresh air cavity and the return air cavity both penetrate the housing along a second direction, a return air opening communicating with the return air cavity and facing the partition plate is formed on the housing, and a rectangular pressure relief opening is formed at one end of the return air cavity along the second direction;

[0008] a fresh air valve arranged in the fresh air cavity for adjusting the fresh air volume;

[0009] a return air valve arranged at one end of the return air cavity along the second direction for adjusting the return air volume;

[0010] The pressure relief valve is arranged at the other end of the return air cavity along the second direction, and is composed of a plurality of rectangular pressure relief plates. The pressure relief port has a first side along a third direction and a second side along the first direction. The length of the first side is greater than the length of the second side, and both are integer multiples of the length of the pressure relief plate. The first direction, the second direction and the third direction are orthogonal to each other.

[0011] Further, the length of the first side is an integer multiple of the length of the pressure relief plate, and the length of the second side is the same as the length of the pressure relief plate.

[0012] Further, the pressure relief valve comprises a plurality of integrally formed pressure relief units. The pressure relief units are sequentially connected along the length direction of the pressure relief plates to form the pressure relief valve. The length of the pressure relief unit is the same as the length of the first side, and a split line is formed between adjacent pressure relief plates.

[0013] Further, the economizer further comprises a return air adapter plate for detachable connection with the shell to adjust the area of the return air port.

[0014] Further, the pressure relief plate is provided with a splicing assembly, and the pressure relief plates are detachably connected through the splicing assembly.

[0015] Further, the end of the pressure relief plate in the length direction is provided with an axle hole extending along the length direction of the pressure relief plate. The splicing assembly comprises a sliding axle and a gear. The sliding axle is slidingly arranged in the axle hole. The sliding axle is provided with a gear rack section. The gear is rotationally arranged on the pressure relief plate and is engaged with the gear rack section.

[0016] The sliding axle has an extended state and a retracted state during sliding along the axle hole. When the sliding axle is in the extended state, the sliding axle extends out of the axle hole to form a plug-in axle section.

[0017] When the sliding axle is in the retracted state, the sliding axle is completely in the axle hole, and an insertion groove section is formed between the outer edge of the axle hole and the sliding axle.

[0018] Further, the splicing assembly further comprises a driving knob coaxially arranged with the gear. The driving knob is configured to drive the rotation of the gear.

[0019] Further, each of the pressure relief plates is provided with two groups of splicing assemblies, and the two groups of splicing assemblies are arranged at the two ends of the pressure relief plate in the length direction.

[0020] According to the second aspect of the present application, the embodiments of the present application provide a rooftop machine comprising the economizer provided by the first aspect of the present application.

[0021] Further, the economizer is installed in the first direction as a vertical direction, and the return air inlet is arranged on the bottom surface of the rooftop machine; or the economizer is installed in the third direction as a vertical direction, and the return air inlet is arranged on the side surface of the rooftop machine.

[0022] The economizer provided in the application realizes flexible adjustment of the split mode according to the installation direction of the economizer without changing the main structure of the shell body, realizes quick switching between vertical installation and horizontal installation, avoids the need to design two sets of economizer structures for different installation directions or to increase a complex adapter, reduces the production, transportation and installation costs, and meanwhile maintains the reliability and working stability of the pressure relief valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application and are incorporated in and constitute a part of this application. The drawings illustrate embodiments of the present application and, together with the description, serve to explain the principles of the present application. In the drawings:

[0024] Figure 1 A structural principle diagram of an economizer for a rooftop machine in the related art is schematically shown;

[0025] Figure 2 A perspective view of an economizer in a return air state provided in the embodiment of the present application is schematically shown Figure 1 ;

[0026] Figure 3 A perspective view of an economizer in a return air state provided in the embodiment of the present application is schematically shown Figure 2 ;

[0027] Figure 4 A perspective view of an economizer in a return air state provided in the embodiment of the present application is schematically shown Figure 2 and Figure 3 ;

[0028] Figure 5 A partial sectional view of an economizer in a return air mode provided in the embodiment of the present application is schematically shown Figure 1 ;

[0029] Figure 6 A partial sectional view of an economizer in a return air mode provided in the embodiment of the present application is schematically shown Figure 2 ;

[0030] Figure 7A perspective view of an economizer side return air mode is schematically shown according to an embodiment of the present application;

[0031] Figure 8 A perspective view of an economizer side return air mode assembled in a roof machine is schematically shown according to an embodiment of the present application;

[0032] Figure 9 A perspective view of a pressure relief plate is schematically shown according to an embodiment of the present application;

[0033] Figure 10 A perspective view of a splicing assembly is schematically shown according to an embodiment of the present application;

[0034] Figure 11 A sectional view of a splicing assembly is schematically shown according to an embodiment of the present application;

[0035] Figures 12-14 Sectional views of a pressure relief plate and a splicing assembly in different states are schematically shown according to an embodiment of the present application;

[0036] Figure 15 A sectional view of a pressure relief unit composed of two pressure relief plates is schematically shown according to an embodiment of the present application;

[0037] Figure 16 A sectional view of a pressure relief unit composed of three pressure relief plates is schematically shown according to an embodiment of the present application;

[0038] Figure 17 A perspective view of a pressure relief unit composed of three pressure relief plates is schematically shown according to an embodiment of the present application;

[0039] Figure 18 A sectional view of another pressure relief plate and a splicing assembly is schematically shown according to an embodiment of the present application;

[0040] Figure 19 A partial enlarged view of A portion in FIG. 1 is shown. Figure 18

[0041] A partial enlarged view of B portion in FIG. 1 is shown. Figure 20 Figure 18 A front view of another splicing assembly is schematically shown according to an embodiment of the present application.

[0042] Figure 21 A front view of another splicing assembly is schematically shown according to an embodiment of the present application.

[0043] A front view of another splicing assembly is schematically shown according to an embodiment of the present application.

[0044] ​100, housing; 110, partition; 120, fresh air cavity; 130, return air cavity; 140, return air port; 150, pressure relief port; 151, first side; 152, second side; 200, fresh air valve; 300, return air valve; 400, pressure relief valve; 410, pressure relief plate; 411, shaft hole; 4111, plug-in groove section; 412, first limiting convex; 413, second limiting convex; 420, splicing assembly; 421, sliding shaft; 4211, plug-in shaft section; 422, gear; 423, rack section; 424, driving knob; 425, tool hole; 426, recess; 427, first positioning convex; 428, second positioning convex; 490, pressure relief unit; 491, division line; 500, return air adapter plate; 600, machine shell; 700, mixed air chamber; 800, heat exchanger; 900, fan. DETAILED DESCRIPTION

[0045] In order to enable persons skilled in the art to better understand the scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative labor should fall within the scope of protection of the present application.

[0046] It should be noted that the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above-described drawings are intended to cover non-exclusive inclusion, for example, a system, product or device including a series of units does not have to be limited to only those units clearly listed, but can include units not clearly listed or inherent to the product or device.

[0047] In the present application, the terms "upper", "lower", "inner", "middle", "outer" and the like indicate the orientation or positional relationship shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0048] In addition, in addition to indicating the orientation or positional relationship, the above-mentioned part of the terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For persons skilled in the art, the specific meaning of these terms in the present application can be understood according to the specific situation.

[0049] Furthermore, the terms "disposed," "connected," and "fixed" should be interpreted broadly. For example, "connected" can mean a fixed connection, a removable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediary, or an internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0050] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0051] like Figure 1 As shown, the main structure of the economizer in the related art includes a shell 100, a fresh air valve 200, a return air valve 300 and a pressure relief valve 400. The internal space of the shell 100 is divided into a fresh air chamber 120 and a return air chamber 130 arranged vertically by a partition 110. The fresh air chamber 120 and the return air chamber 130 both pass through the shell 100 horizontally. A return air port 140 communicating with the return air chamber 130 is provided on the bottom surface of the shell 100. A pressure relief port 150 is formed at one end of the return air chamber 130 along the horizontal direction. The valve 200 is arranged in the fresh air chamber 120 for adjusting the air intake volume of the fresh air; the return air valve 300 is arranged at one end of the return air chamber 130 along the horizontal direction for adjusting the air intake volume of the return air; the pressure relief valve 400 is rotatably arranged at the other end of the return air chamber 130 along the horizontal direction, and the upper end of the valve plate of the pressure relief valve 400 is rotatably connected to the housing 100 of the economizer. The rotation axis of the pressure relief valve 400 is horizontal. Due to the gravity of the pressure relief valve 400, the pressure relief valve 400 will naturally cover the exhaust port in a vertical form.

[0052] When a unit equipped with an air-side economizer is operating in full return air mode, fresh air valve 200 is closed and return air valve 300 is open. The return air chamber 130 of the unit's economizer is under negative pressure. Therefore, the indoor pressure on both sides of the pressure relief valve is lower than the outdoor pressure. Atmospheric pressure forces pressure relief valve 400 to close. As the outdoor temperature or outdoor enthalpy decreases, the opening of fresh air valve 200 is controlled to increase, while the opening of return air valve 300 decreases. Simultaneously, the increased fresh air volume increases the indoor positive pressure. When the indoor positive pressure exceeds the outdoor pressure, the pressure differential overcomes the gravitational force of pressure relief valve 400, causing it to rotate open.

[0053] exist Figure 1 In the structure shown, the economizer is suitable for the bottom return air form, that is, it is suitable for vertical installation of the economizer, and the return air inlet 140 is located at the bottom of the economizer. If it is necessary to apply it to the side return air form, it is necessary to Figure 1The economizer in the economy is vertically flipped, so that the surface on which the bottom return air inlet 140 is vertically arranged, at this time the pressure relief port 150 and the pressure relief valve 400 thereon are also vertically flipped, the axis of the rotation shaft of the pressure relief valve 400 is vertically arranged, the pressure relief valve 400 cannot naturally form a vertical state by using its gravity in a natural state to cover the pressure relief port 150, and the pressure relief valve 400 will not work normally.

[0054] Based on this, as Figures 2-8 shown, the main structure of the economizer provided by the embodiment of the present application includes a shell 100, a fresh air valve 200, a return air valve 300, and a pressure relief valve 400, wherein the internal space of the shell 100 is divided into a fresh air cavity 120 and a return air cavity 130 arranged along a first direction a by a partition plate 110, the fresh air cavity 120 and the return air cavity 130 both penetrate the shell 100 along a second direction b, the shell 100 is provided with a return air inlet 140 communicating with the return air cavity 130 and facing the partition plate 110, and one end of the return air cavity 130 along the second direction b forms a rectangular pressure relief port 150; the fresh air valve 200 is arranged in the fresh air cavity 120 to adjust the fresh air inlet amount; the return air valve 300 is arranged at one end of the return air cavity 130 along the second direction b to adjust the return air inlet amount; and the pressure relief valve 400 is rotationally arranged at the other end of the return air cavity 130 along the second direction b, the pressure relief valve 400 is composed of a plurality of rectangular pressure relief plates 410, the pressure relief port 150 has a first edge 151 along a third direction c and a second edge 152 along the first direction a, the length of the first edge 151 and the length of the second edge 152 are both integer multiples of the length of the pressure relief plate 410, and the first direction a, the second direction b, and the third direction c are orthogonal to each other.

[0055] In the present embodiment, when the economizer is applied to the lower return air form, as Figures 2-6 shown, the economizer is installed with the first direction a as the vertical direction, the return air inlet 140 is arranged on the bottom surface of the roof machine, at this time the first edge 151 of the pressure relief port 150 is in the horizontal direction and the second edge 152 is in the vertical direction, the pressure relief plates 410 are sequentially arranged and combined along the length direction to form a pressure relief unit 490 equal in length to the first edge 151, the two ends of the pressure relief unit 490 are rotationally connected to the second edges 152 on the two sides, a plurality of pressure relief units 490 are sequentially arranged along the direction of the second edge 152 to complete the coverage of the entire pressure relief port 150, and of course the length of the second edge 152 of the pressure relief port 150 should also be an integer multiple of the width of the pressure relief plate 410; when the economizer is adjusted to be applied to the side return air form, as Figures 7-8As shown, the economizer is installed vertically with the third direction c as the vertical direction, the return air inlet 140 is arranged on the side of the rooftop machine, at this time the first side 151 of the pressure relief port 150 is in the vertical direction and the second side 152 is in the horizontal direction, the pressure relief plates 410 are arranged in sequence along the length direction to form a pressure relief unit 490 with the same length as the second side 152, and the two ends of the pressure relief unit 490 are rotationally connected to the first side 151 on both sides. A plurality of pressure relief units 490 are arranged in sequence along the direction of the first side 151 to complete the coverage of the entire pressure relief port 150. Of course, the length of the first side 151 of the pressure relief port 150 should also be an integer multiple of the width of the pressure relief plate 410.

[0056] By designing the pressure relief valve 400 as a splittable form of a plurality of pressure relief plates 410, and by setting a suitable size relationship between the pressure relief plate 410 and the pressure relief port 150, the pressure relief valve 400 is split and reassembled, which realizes flexible adjustment of the split mode according to the installation direction of the economizer without changing the main structure of the shell 100, realizes quick switching between vertical installation and horizontal installation, avoids the need to design two sets of economizer structures for different installation directions or to increase complex adapters, reduces production, transportation and installation costs, and at the same time maintains the reliability and working stability of the pressure relief valve 400.

[0057] In some embodiments, the length of the first side 151 is an integer multiple of the length of the pressure relief plate 410 and more than twice, and the length of the second side 152 is the same as the length of the pressure relief plate 410. Because the return air cavity 130 and the fresh air cavity 120 are arranged in the first direction a (i.e., the extension direction of the second side 152) of the economizer, the length of the second side 152 is limited by the structural layout and is difficult to design longer. In order to balance the proportion and size of the entire economizer, the length of the first side 151 is usually designed to be longer than the length of the second side 152, so that more pressure relief units 490 can be accommodated when the pressure relief valve 400 is split and arranged, thereby realizing a larger exhaust passage area and improving the pressure relief efficiency.

[0058] On the basis of the above-mentioned embodiments, as shown, Figure 4 As an optional design of the pressure relief valve 400, the pressure relief valve 400 includes a plurality of pressure relief units 490 arranged in one piece, the pressure relief units 490 are sequentially connected by a plurality of pressure relief plates 410 along the length direction, the length of the pressure relief unit 490 is the same as the length of the first side 151, and a split line 491 is formed between adjacent pressure relief plates 410.

[0059] The pressure relief valve 400 in this embodiment can be directly applied to the economizer in the down return air mode, that is, the economizer is installed with the first direction a as the vertical direction, at this time the first side 151 of the pressure relief port 150 is in the horizontal direction, the second side 152 is in the vertical direction, and the two ends of the pressure relief unit 490 can be directly connected to the second side 152 on the two sides. A plurality of pressure relief units 490 are arranged in sequence along the direction of the second side 152 to complete the coverage of the entire pressure relief port 150; when the economizer is adjusted to the side return air mode, the economizer is installed with the third direction c as the vertical direction, at this time the first side 151 of the pressure relief port 150 is in the vertical direction, and the second side 152 is in the horizontal direction. The integrally formed pressure relief unit 490 is directly divided into an independent pressure relief plate 410 along the division line 491. Since the length of the second side 152 is equal to the length of the pressure relief plate 410, at this time a single pressure relief plate 410 forms a pressure relief unit 490, and the two ends thereof are rotatably connected to the first side 151 on the two sides. A plurality of pressure relief plates 410 are arranged in sequence along the direction of the first side 151 to complete the coverage of the entire pressure relief port 150.

[0060] The present embodiment is suitable for the use scenario of adjusting the vertically installed economizer to be horizontally installed. Since the length of the second side 152 is equal to the length of the pressure relief plate 410, when the vertically installed economizer is adjusted to be horizontally installed, it is only necessary to divide the pressure relief unit 490 along the division line 491, without the need to recombine the pressure relief plates 410, thereby further simplifying the modification operation and improving the adaptive flexibility.

[0061] Preferably, the form of the division line 491 includes but is not limited to forming a groove between the two partition plates 110, which plays a role in visual and structural separation, and facilitates mechanical cutting or manual breaking of the pressure relief unit 490 when needed, thereby realizing the quick separation and individual use of the pressure relief plate 410.

[0062] In some embodiments, as shown in Figure 7 The economizer further includes a return air adapter plate 500 which is detachably installed at the return air port 140 of the shell 100 and is used to adjust the effective ventilation area of the return air port 140 in different installation modes. Specifically, when the economizer is installed with the first direction a as the vertical direction and is suitable for the down return air mode, the return air adapter plate 500 is installed to reduce the effective area of the return air port 140 to a small size suitable for the down return air working condition; when the economizer is installed with the third direction c as the vertical direction and is suitable for the side return air mode, the return air adapter plate 500 is detached to increase the effective area of the return air port 140 to a large size suitable for the side return air working condition. Through the above design, the shell 100 does not need to be replaced to flexibly switch between the down return air and the side return air, thereby simplifying the structural modification process and reducing the installation and manufacturing costs.

[0063] In some embodiments, the pressure relief plates 410 are provided with a splicing assembly 420, and the pressure relief plates 410 are detachably connected to each other through the splicing assembly 420. Figures 9-21 The figure shows an exemplary description of the relevant contents of the splicing component 420. The form of the splicing component 420 may include but is not limited to a snap-on structure, a slide groove structure, a plug-in structure or a threaded connection structure, etc., which is used to achieve stable splicing and quick disassembly of adjacent pressure release plates 410 in their length direction.

[0064] In a specific application, when the economizer is in the down-return air mode (the first direction a is vertical installation), multiple pressure relief plates 410 can be sequentially connected via the splicing assembly 420 to form a pressure relief unit 490 with the same length as the first side 151. The two ends of the pressure relief unit 490 are pivotally connected to the second sides 152 on both sides of the pressure relief port 150. The multiple pressure relief units 490 are sequentially arranged along the second sides 152 to cover the entire pressure relief port 150. When the economizer is adjusted to the side-return air mode (the third direction c is vertical installation), the original pressure relief units 490 can be disassembled into individual pressure relief plates 410 using the splicing assembly 420. These are then reassembled into pressure relief units 490 of a suitable length according to the side length requirements of the pressure relief port 150, and pivotally connected to the first sides 151 on both sides of the pressure relief port 150 to complete the reconfiguration of the pressure relief valve 400.

[0065] Through the above design, the modularization and recyclability of the pressure relief plate 410 are achieved by utilizing the splicing assembly 420, which reduces the replacement frequency of the pressure relief valve 400 under different installation modes, reduces the manufacturing cost, and significantly improves the convenience of installation and maintenance.

[0066] In some embodiments, as Figures 12-14 As shown, the end portion of the pressure release plate 410 in the longitudinal direction is provided with an axial hole 411 extending along the longitudinal direction of the pressure release plate 410, and the splicing assembly 420 includes a sliding shaft 421 and a gear 422, the sliding shaft 421 is slidably set in the axial hole 411, and a rack section 423 is set on the sliding shaft 421, and the gear 422 is rotatably set on the pressure release plate 410 and engages with the rack section 423; the sliding shaft 421 has an extended state and a retracted state during the sliding process along the axial hole 411, when the sliding shaft 421 is in the extended state, the sliding shaft 421 extends out of the axial hole 411 to form a plug-in shaft section 4211; when the sliding shaft 421 is in the retracted state, the sliding shaft 421 is completely in the axial hole 411, and a plug-in groove section 4111 is formed between the outer edge of the axial hole 411 and the sliding shaft 421.

[0067] The rotation of gear 422 drives the sliding shaft 421 to translate longitudinally along the shaft hole 411, thereby switching the sliding shaft 421 between an extended state and a retracted state. Specifically, during use, the sliding shaft 421 of one pressure release plate 410 can be adjusted to an extended state to form a plug-in shaft section 4211; the sliding shaft 421 of another adjacent pressure release plate 410 can be adjusted to a retracted state to form a plug-in slot section 4111. By inserting the plug-in shaft section 4211 into the plug-in slot section 4111, the two adjacent pressure release plates 410 can be removably plugged in, thereby enabling rapid assembly and disassembly in different installation modes. When one side of the pressure relief plate 410 does not need to be connected to other pressure relief plates 410, the sliding shaft 421 on this side can be maintained in an extended state, and its plug-in shaft section 4211 directly serves as the rotating shaft end of the pressure relief valve 400, and rotates with the preset rotating hole on the first side 151 or the second side 152 of the pressure relief port 150, thereby realizing the reliable assembly and rotation opening and closing function of the pressure relief valve 400 and the shell 100.

[0068] Through the above structure, the design of the engagement between the sliding shaft 421 and the gear 422 not only facilitates the rapid switching of the telescopic state and improves the efficiency of assembly and disassembly, but also takes into account the splicing between the pressure relief plates 410 and the overall rotating shaft function of the pressure relief valve 400, thereby realizing functional reuse of components and structural simplification.

[0069] In some embodiments, the splicing assembly 420 further includes a drive knob 424 coaxially arranged with the gear 422, and the drive knob 424 is configured to drive the gear 422 to rotate, thereby realizing the sliding movement of the sliding shaft 421 along the shaft hole 411 to switch between the extended state and the retracted state.

[0070] Specifically, drive knob 424 is connected to gear 422 through axial fixation, integral molding, or keying. When the operator rotates drive knob 424, gear 422 rotates accordingly, driving sliding shaft 421 to produce linear sliding, causing sliding shaft 421 to extend or retract along its length within shaft hole 411. Through the meshing mechanism between gear 422 and the rack, the rotational motion is effectively converted into linear motion of sliding shaft 421, achieving reliable switching between the plug-in shaft section 4211 and the plug-in slot section 4111 between pressure release plates 410. For ease of operation, drive knob 424 adopts an ergonomic design with anti-slip textures or grooves on the surface, making it easier to grip and rotate, improving the comfort and precision of manual adjustment.

[0071] In addition, if Figure 10 As shown, one or more tool holes 425 may be provided in the radial direction of the driving knob 424. The size and shape of the tool hole 425 are suitable for auxiliary tools such as commonly used wrenches and long rods, so that the operator can insert the tool to effectively rotate the driving knob 424 in situations where space is limited or a larger torque is required.

[0072] Through the control of the driving knob 424, the operator can accurately adjust the connection state of the pressure relief plate 410 according to the actual installation requirements, so as to realize the quick switching and repeated use of the economizer pressure relief valve 400 in different installation modes.

[0073] In some embodiments, two groups of the splicing assemblies 420 are arranged on each of the pressure relief plates 410, and the two groups of the splicing assemblies 420 are arranged at the two ends of the pressure relief plate 410 in the length direction. Similarly, the shaft holes 411 extending along the length direction of the pressure relief plate 410 are arranged at the two ends of the pressure relief plate 410 in the length direction.

[0074] Specifically, the sliding shaft 421 of the splicing assembly 420 is installed in the shaft hole 411 at the two ends of the pressure relief plate 410, and the conversion between the plug-in shaft section 4211 and the plug-in groove section 4111 is realized through the extension and retraction movement of the sliding shaft 421 in the shaft hole 411, so as to facilitate the stable cooperation with the corresponding splicing assembly 420 of another pressure relief plate 410. The splicing assemblies 420 arranged at the two ends not only ensure the firm connection between the pressure relief plate 410 and the adjacent pressure relief plate 410, but also can flexibly adjust the length and form of the pressure relief valve 400 to adapt to different installation requirements. The design makes the pressure relief plate 410 realize bidirectional splicing connection, and no matter which installation direction the economizer is in, the effective combination and disassembly of the pressure relief plate 410 can be realized through the adjustment of the extension and retraction state of the splicing assemblies 420 at the two ends, so as to improve the modularity, universality and maintenance convenience of the economizer pressure relief valve 400.

[0075] As shown in Figure 12 , two groups of the splicing assemblies 420 arranged on each of the pressure relief plates 410 can realize the state that the plug-in shaft sections 4211 are formed on both sides of the pressure relief plate; as shown in Figure 13 , two groups of the splicing assemblies 420 arranged on each of the pressure relief plates 410 can realize the state that the plug-in groove sections 4111 are formed on both sides of the pressure relief plate; as shown in Figure 14 , two groups of the splicing assemblies 420 arranged on each of the pressure relief plates 410 can realize the state that the plug-in shaft sections 4211 and the plug-in groove sections 4111 are respectively formed on the two sides of the pressure relief plate 410. Through one of the pressure relief plates 410 in Figure 12 and Figure 14 , the pressure relief unit 190 shown in Figure 15 can be obtained by splicing; through two of the pressure relief plates 410 shown in Figure 12 and one of the pressure relief plates 410 shown in Figure 13 , the pressure relief unit 190 shown in Figure 16 and 17 can be obtained by splicing.

[0076] In some embodiments, as shown in Figures 18-21As shown, the side of the sliding rod away from the rack segment 423 is formed with a recess 426, the first positioning convex 427 and the second positioning convex 428 are arranged in the recess 426 in intervals, and the first limiting convex 412 and the second limiting convex 413 are arranged on the wall surface of the shaft hole 411 in intervals. When the sliding shaft 421 is in the extended state, the first positioning convex 427 is limited between the first limiting convex 412 and the second limiting convex 413, and when the sliding shaft 421 is in the retracted state, the second positioning convex 428 is limited between the first limiting convex 412 and the second limiting convex 413.

[0077] Specifically, when the sliding shaft 421 is in the extended state, the first positioning convex 427 on the sliding shaft 421 is limited between the first limiting convex 412 and the second limiting convex 413, preventing the sliding shaft 421 from being excessively extended, ensuring that the length of the plug-in shaft segment 4211 is appropriate, and ensuring that the splicing between the pressure relief plates 410 is stable and reliable; when the sliding shaft 421 is in the retracted state, the second positioning convex 428 on the sliding shaft 421 is limited between the first limiting convex 412 and the second limiting convex 413, preventing the sliding shaft 421 from being excessively retracted, ensuring that the plug-in groove segment 4111 is appropriately sized, and ensuring that the plug-in groove segment 4111 can be smoothly plugged between the pressure relief plates 410.

[0078] The structure realizes precise limiting of the sliding shaft 421 between the extended and retracted states through cooperation of the first positioning convex 427, the second positioning convex 428, and the limiting convex, effectively preventing the sliding shaft 421 from deviating or misacting, and improving the stability and durability of the splicing assembly 420.

[0079] Preferably, the first positioning convex 427, the second positioning convex 428, the first limiting convex 412, and the second limiting convex 413 are all designed as arc convexes. When the operator rotates the gear 422, the force transmitted by the gear 422 causes the positioning convex on the sliding shaft 421 to interfere with the limiting convex on the shaft hole 411 and be elastically deformed, overcoming the locking action between the positioning convex and the limiting convex, so that the sliding shaft 421 can be unlocked and locked between the extended state and the retracted state.

[0080] The embodiment of the present application also protects a rooftop machine, which comprises the economizer disclosed in the embodiment of the present application. In the embodiment, the economizer is an air-side economizer, which is usually installed outdoors. When the economizer is applied in the rooftop machine, the economizer is installed outdoors as part of the rooftop machine, and the rooftop machine is also installed outdoors as a whole and communicates with each room through a pipeline. The structure of the rooftop machine comprises a machine shell 600, and the machine shell 600 further comprises a mixed air chamber 700, a heat exchanger 800, and a fan 900. The heat exchanger 800 is arranged on the air outlet path of the mixed air chamber 700. The return air valve 300 and the fresh air valve 200 of the economizer are both arranged to face the mixed air chamber 700 and the heat exchanger 800.

[0081] In some embodiments, as Figure 5 and 6 As shown, the economizer is installed vertically with the first direction a as the vertical orientation, and the return air vent 140 is located on the bottom surface of the rooftop unit. This structure is suitable for rooftop units with downward return air. The return air vent 140 faces the bottom of the rooftop unit, facilitating connection with the building's return air system, achieving effective air circulation and energy-saving control.

[0082] In some embodiments, as Figure 8 As shown, the economizer is installed vertically with the third direction c as the vertical orientation, and the return air vent 140 is located on the side of the rooftop unit. This configuration is suitable for rooftop units with side return air. The return air vent 140 faces the side of the rooftop unit, which helps adapt to the diverse needs of building space layouts and facilitates the introduction and discharge of side return air.

[0083] Through these two installation methods, the rooftop unit can flexibly adjust the economizer's orientation to meet different building environments and return air requirements. This avoids the complexity of designing different economizer models for different installation orientations, reducing production and inventory costs. Furthermore, the economizer's adjustable design ensures the proper functioning of key components such as the pressure relief valve 400, ensuring optimal ventilation and energy-saving performance regardless of the unit's installation position.

[0084] Furthermore, the rooftop unit can also cooperate with a related control system to automatically adjust the fresh air volume and return air volume of the economizer valve and the pressure relief valve 400, further optimizing energy efficiency and improving the performance and reliability of the overall air conditioning system. Some embodiments are described in this specification in a progressive or parallel manner. Each embodiment focuses on the differences from other embodiments. Similar or identical parts between the various embodiments can be referred to in conjunction with each other.

[0085] The above are merely specific embodiments of the present application to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but rather is intended to conform to the widest scope consistent with the principles and novel features of the present application.

Claims

1. An economizer characterized by, The utility model relates to an economizer, a fresh air valve, a return air valve and a pressure relief valve. The fresh air valve is arranged in the fresh air cavity for adjusting the air intake of fresh air. The return air valve is arranged at one end of the return air cavity along the second direction for adjusting the air intake of return air. The pressure relief valve is arranged at the other end of the return air cavity along the second direction. The pressure relief valve includes a plurality of pressure relief plates arranged integrally.

2. The economizer of claim 1, wherein The length of the first edge is an integer multiple of the length of the pressure relief plate.

3. The economizer of claim 2, wherein, The length of the second edge is the same as the length of the pressure relief plate.

4. The economizer of claim 1, wherein, The pressure relief valve includes a plurality of pressure relief units arranged integrally.

5. The economizer of claim 1, wherein, The length of the pressure relief unit is the same as the length of the first edge.

6. The economizer of claim 5, wherein, The return air adapter plate is used for detachable connection with the housing to adjust the area of the return air opening. The pressure relief plate is provided with a splicing assembly. The end of the pressure relief plate along the length direction is provided with an axle hole extending along the length direction of the pressure relief plate.

7. The economizer of claim 6, wherein The splicing assembly includes a sliding axle and a gear.

8. The economizer of any of claims 5-7, wherein, The sliding axle is arranged in the axle hole.

9. A rooftop unit, characterized in that: The sliding axle is provided with a gear rack segment. The sliding axle has an extended state and a retracted state during sliding along the axle hole. When the sliding axle is in the extended state, the sliding axle extends out of the axle hole to form a plug-in axle segment. When the sliding axle is in the retracted state, the sliding axle is completely in the axle hole. The splicing assembly further includes a driving knob coaxially arranged with the gear. The driving knob is configured to drive the gear to rotate. Each pressure relief plate is provided with two groups of splicing assemblies arranged at both ends of the length direction of the pressure relief plate. The utility model relates to an economizer.

10. The rooftop machine of claim 9, wherein: The economizer is installed with the first direction as the vertical direction, and the return air opening is arranged on the bottom surface of the rooftop machine; or The economizer is installed with the third direction as the vertical direction, and the return air opening is arranged on the side surface of the rooftop machine.

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