Worm gear assembly capable of feeding back position, temperature control valve and air cycle machine

Abstract

The invention provides a worm gear assembly capable of feeding back a position, a temperature control valve and an air circulation machine, the worm gear assembly comprises a worm gear and a feedback position contact, the worm gear is of a fan-shaped cylinder structure, the feedback position contact is arranged on the end face of one side of the fan-shaped cylinder structure in the circumferential direction, the feedback position contact protrudes out of the end face of one side of the fan-shaped cylinder structure in the circumferential direction, and the feedback position contact is arranged on the end face of the other side of the fan-shaped cylinder structure in the circumferential direction. The feedback position contact comprises a first connecting part in matched connection with the fan-shaped cylinder structure, a first mounting hole is formed in the end face of one side of the fan-shaped cylinder structure in the circumferential direction and faces the interior of the fan-shaped cylinder structure, and the first connecting part is connected and matched with the first mounting hole, so that when the length of the part, protruding out of the end face of one side of the circumferential direction, of the feedback position contact is abraded and becomes shorter, the feedback position contact is fixed. The first connecting part located in the first mounting hole can be controlled to partially extend out of the end face of one side in the circumferential direction by a preset length. According to the invention, the problem of inaccurate position detection caused by low feedback precision of the positions of the temperature control valve and the worm gear of the air cycle machine can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of air cycle machines, and in particular to a worm gear assembly capable of feedback of position, a temperature control valve and an air cycle machine. Background Art

[0002] With the continuous development of air-conditioning technology, the application occasions of air-conditioning have been unprecedentedly expanded, such as train air-conditioning, shipboard air-conditioning and aircraft air-conditioning. Different from the "refrigerant + four-way valve" refrigeration scheme of conventional air-conditioning, aircraft air-conditioning adopts the "air cycle machine + temperature control valve" refrigeration scheme to achieve air conditioning. Therefore, aircraft air-conditioning is also called environmental control system. As the core component of temperature control of environmental control system, the temperature control valve has high reliability and control accuracy requirements, and requires the valve opening to have visual mechanical indication and electronic trigger signal. Worm gear transmission has the characteristics of large transmission torque and position self-locking, and is often used as the final transmission pair of the temperature control valve reduction mechanism.

[0003] Since the temperature control valve of the air cycle machine in the prior art has technical problems such as low worm gear feedback position accuracy due to contact wear, resulting in inaccurate position detection, the present invention studies and designs a worm gear assembly, a temperature control valve and an air cycle machine that can feedback the position. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the temperature control valve of the air cycle machine in the prior art that the worm gear feedback position accuracy is low due to contact wear, resulting in inaccurate position detection, thereby providing a worm gear assembly, a temperature control valve and an air cycle machine that can feedback the position.

[0005] In order to solve the above problems, the present invention provides a worm gear assembly capable of feedback of position, comprising:

[0006] A worm gear and a feedback position contact, wherein the worm gear is a fan-shaped column structure, and its cross-sectional area is a fan-shaped structure. The feedback position contact is arranged on the end face of one circumferential side of the fan-shaped column structure, and the feedback position contact protrudes from the end face of one circumferential side of the fan-shaped column structure so as to be able to sense with a micro switch and feedback the position signal of the worm gear, and the feedback position contact includes a first connecting portion that is matched with the fan-shaped column structure, and a first mounting hole is opened on the end face of one circumferential side of the fan-shaped column structure toward the inside of the fan-shaped column structure, and the first connecting portion and the first mounting hole are connected and matched so that when the length of the part of the feedback position contact protruding from the end face of one circumferential side is worn and shortened, the first connecting portion located in the first mounting hole can be controlled to extend out of the preset length of the end face of one circumferential side.

[0007] In some embodiments,

[0008] An external thread is arranged on the outer periphery of the first connecting portion, and the first mounting hole is a threaded hole. The first connecting portion is threadedly connected to the first mounting hole so that when the length of the portion of the feedback position contact protruding from the end face on one side of the circumference is worn and shortened, the feedback position contact can be controlled to rotate so that the connecting section portion located in the first mounting hole extends out of the end face on one side of the circumference by a preset length.

[0009] In some embodiments,

[0010] The worm wheel has a first circumferential end surface located on one circumferential side thereof and a second circumferential end surface located on the other circumferential side thereof. There are two feedback position contacts, one of which is arranged on the first circumferential end surface and protrudes from the first circumferential end surface, and the other feedback position contact is arranged on the second circumferential end surface and protrudes from the second circumferential end surface.

[0011] In some embodiments,

[0012] In the projection plane of the axial end face, the worm wheel is a sector-shaped structure with a central angle less than 180°; and / or, the outer peripheral surface of the worm wheel is also provided with worm wheel teeth that can mesh with worm gear teeth.

[0013] In some embodiments,

[0014] It also includes a worm gear shaft, the worm wheel has a cylindrical hole structure, the worm gear shaft is inserted into the cylindrical hole structure, and the worm gear can rotate integrally with the worm gear shaft; and a position pointer is provided on the outer circumferential surface of the worm gear shaft at a position where the worm wheel is not provided, and the position pointer can display the rotation position of the worm gear.

[0015] In some embodiments,

[0016] The position pointer has a central axis, and the central axis is perpendicular to the central axis of the worm gear shaft, so that the position pointer protrudes outward from the outer peripheral surface of the worm gear shaft along the radial direction of the worm gear shaft.

[0017] In some embodiments,

[0018] The outer peripheral surface of the worm gear shaft is provided with a second mounting hole toward the inside thereof. The position pointer includes a second connecting portion and a pointer portion. The second connecting portion is fixedly connected to the second mounting hole, and the pointer portion protrudes from the second mounting hole.

[0019] In some embodiments,

[0020] The second connection portion is a threaded column structure with an external thread, the second mounting hole has an internal thread, and the second connection portion is threadedly matched with the second mounting hole.

[0021] In some embodiments,

[0022] The worm wheel is also provided with a weight-reducing hole extending through the direction from one axial end face to the other axial end face.

[0023] In some embodiments,

[0024] The width of the weight-reducing hole in the radial direction does not exceed 1 / 3 of the radius of the worm wheel; or, there are multiple weight-reducing holes, and the sum of the widths of the multiple weight-reducing holes in the radial direction does not exceed 1 / 3 of the radius of the worm wheel.

[0025] In some embodiments,

[0026] The worm gear shaft also includes a first stepped shaft section and a second stepped shaft section, the first stepped shaft section is located at one axial end of the worm gear shaft, and the second stepped shaft section is located between the worm gear and the position pointer, the worm gear assembly also includes a first bearing and a second bearing, the first bearing is sleeved on the first stepped shaft section, and the second bearing is sleeved on the second stepped shaft section, so that the worm gear is located between the first bearing and the second bearing.

[0027] The present invention also provides an air cycle machine, characterized in that:

[0028] It comprises the aforementioned worm gear assembly and also comprises a temperature control valve, wherein the worm gear shaft is connected to a valve flap of the temperature control valve and can rotate integrally with the valve flap.

[0029] The worm gear assembly and air cycle machine capable of feedback of position provided by the present invention have the following beneficial effects:

[0030] 1. The present invention sets the worm wheel as a fan-shaped column structure, and sets a feedback position contact on the circumferential side end face of the fan-shaped column, which can sense (preferably touch) with a micro switch to realize feedback and detection of the worm wheel position signal, and a first mounting hole is set on the circumferential end face of the worm wheel, and the feedback position contact includes a first connecting part, which is plugged into the first mounting hole, and when the protruding part of the feedback position contact is worn and shortened, the first connecting part can be extended to a longer length, thereby avoiding the situation where the signal feedback accuracy is reduced due to wear caused by long-term triggering of the contact, and solving the problem of low feedback accuracy of the temperature control valve and worm wheel position of the air cycle machine, resulting in inaccurate position detection.

[0031] 2. The present invention can also display the rotation position of the worm wheel by connecting the position pointer to the outer circumferential surface of the worm gear shaft so as to protrude outward, thereby realizing visual monitoring of the rotation position of the worm gear and further realizing visual monitoring of the valve opening position, thereby avoiding the transmission angle deviation problem caused by the coaxial connection between the pointer and the worm gear; the present invention can also save materials and reduce weight while realizing temperature valve opening detection by setting the circumferential center angle of the worm gear to be less than 180°, and further arranging weight reduction holes on the worm gear can also reduce the weight of the temperature control valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is an assembly structure diagram of the worm gear assembly capable of feedback position of the present invention;

[0033] Figure 2 It is an exploded structural diagram of the worm gear assembly capable of feedback position of the present invention;

[0034] Figure 3 yes Figure 1 Bottom view of

[0035] Figure 4 yes Figure 1 A partial enlarged view of the position contact in FIG.

[0036] Figure 5 yes Figure 1 A partial enlargement of the position pointer in .

[0037] The reference numerals are:

[0038] 1. First bearing; 2. Worm gear; 2-1. Countersunk hole; 2-2. First stepped shaft section; 2-3. Lightening hole; 2-4. First mounting hole; 2-5. Second stepped shaft section; 2-6. Second mounting hole; 2-7. Guide boss; 2-8. Worm gear tooth; 3. Position contact; 3-1. First connecting part; 3-2. Contact part; 4. Second bearing; 5. Position pointer; 5-1. Second connecting part; 5-2. Pointer part; 6. Worm gear shaft. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0042] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0043] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0044] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0045] like Figure 1-5 As shown, the present invention provides a worm gear assembly capable of feedback position, which comprises:

[0046] A worm gear 2 and a feedback position contact 3, wherein the worm gear 2 is a fan-shaped cylindrical structure, and its cross-sectional area is a fan-shaped structure. The feedback position contact 3 is arranged on the end face of one circumferential side of the fan-shaped cylindrical structure, and the feedback position contact 3 protrudes from the end face of one circumferential side of the fan-shaped cylindrical structure, so as to be able to sense with a micro switch and feedback the position signal of the worm gear 2, and the feedback position contact 3 includes a first connecting portion 3-1 which is connected to the fan-shaped cylindrical structure, and a first mounting hole 2-4 is opened on the end face of one circumferential side of the fan-shaped cylindrical structure toward the inside of the fan-shaped cylindrical structure, and the first connecting portion 3-1 is connected to and cooperated with the first mounting hole 2-4, so that when the length of the part of the feedback position contact 3 protruding from the end face of one circumferential side is worn and shortened, the first connecting portion 3-1 located in the first mounting hole 2-4 can be controlled to extend out of the preset length of the end face of one circumferential side.

[0047] The present invention sets the worm wheel as a fan-shaped column structure, and a feedback position contact is arranged on the circumferential side end face of the fan-shaped column, which can sense (preferably touch) with a micro switch to realize feedback and detection of the worm wheel position signal, and a first mounting hole is arranged on the circumferential end face of the worm wheel. The feedback position contact includes a first connecting part, which is plugged into the first mounting hole, and can extend the first connecting part to a longer length when the protruding part of the feedback position contact wears and becomes shorter, thereby avoiding the situation where the signal feedback accuracy is reduced due to wear caused by long-term triggering of the contact, and solving the problem of low feedback accuracy of the temperature control valve and worm wheel position of the air cycle machine, resulting in inaccurate position detection.

[0048] The present invention connects a contact capable of triggering a micro switch to generate a position feedback signal to a specific position of a worm gear through a thread, thereby realizing a temperature control valve flap position detection function and solving the problem of reduced position feedback accuracy due to contact wear.

[0049] In some embodiments,

[0050] An external thread is arranged on the outer periphery of the first connecting portion 3-1, and the first mounting hole 2-4 is a threaded hole. The first connecting portion 3-1 is threadedly connected to the first mounting hole 2-4 so that when the length of the portion of the feedback position contact 3 protruding from the end face of one circumferential side is worn and shortened, the feedback position contact 3 can be controlled to rotate so that the connecting section portion located in the first mounting hole 2-4 extends out of the end face of one circumferential side by a preset length.

[0051] This is the preferred structural form of the first connecting part and the first mounting hole of the present invention. It is set as a structural mode of threaded matching of the threaded column and the threaded hole. The first connecting part can be extended or retracted from the first mounting hole by rotating the contact part of the feedback position contact, so that when the contact part is severely worn, the first connecting part can be rotated to extend the length of the extension, thereby ensuring its normal position feedback and detection and improving the detection accuracy.

[0052] The first mounting hole 2-4 of the present invention is preferably located at the center of the circumferential end surface of the worm wheel in the axial direction, and the threaded hole diameter should not exceed 1 / 3 of the thickness of the worm wheel, so as to ensure the structural strength of the worm wheel while ensuring the installation of the feedback position contact.

[0053] Figure 4 As shown, the position contact of the present invention is composed of a stud (first connection part 3-1) matched with the threaded hole of the worm gear and a contact part 3-2 for actuating the position feedback mechanism of the micro switch of the valve. The stud is used to fix the position contact and the worm gear together, and the two sides of the contact are designed with planes for tightening the stud of the contact.

[0054] In some embodiments,

[0055] The worm wheel 2 has a first circumferential end surface located on one circumferential side thereof, and a second circumferential end surface located on the other circumferential side thereof. There are two feedback position contacts 3, one of which is arranged on the first circumferential end surface and protrudes from the first circumferential end surface, and the other feedback position contact 3 is arranged on the second circumferential end surface and protrudes from the second circumferential end surface.

[0056] This is the preferred structural form of the feedback position contact of the present invention. By arranging the feedback position contacts on both circumferential end faces of the worm gear, detection can be performed simultaneously through the feedback position contacts at the two circumferential end faces, and the two can be compared and corrected, thereby further improving the accuracy of position feedback and detection.

[0057] In some embodiments,

[0058] In the projection plane of the axial end face, the worm wheel 2 is a fan-shaped structure with a central angle less than 180° (more preferably 120°); and / or, the outer peripheral surface of the worm wheel 2 is also provided with worm wheel teeth 2-8 that can mesh with the worm gear teeth.

[0059] The present invention can save materials and reduce weight while realizing temperature valve opening detection by setting the circumferential center angle of the worm wheel to be less than 180°. The outer peripheral surface of the worm wheel of the present invention is provided with worm gear teeth which can mesh with the worm gear teeth to realize the purpose of converting rotational transmission into linear motion, or converting linear motion transmission into rotation.

[0060] The worm wheel of the present invention preferably adopts a fan-shaped worm wheel of about 120° according to the actual valve opening requirements, and a weight-reducing hole is opened on the worm wheel to achieve weight reduction of the temperature control valve.

[0061] In some embodiments,

[0062] It also includes a worm gear shaft 6, the worm wheel 2 has a cylindrical hole structure, the worm gear shaft 6 is inserted into the cylindrical hole structure, and the worm gear 2 can rotate integrally with the worm gear shaft 6; and a position pointer 5 is provided on the outer peripheral surface of the worm gear shaft 6 at a position where the worm wheel 2 is not provided, and the position pointer 5 can display the rotation position of the worm wheel 2.

[0063] The present invention can also display the rotation position of the worm wheel by connecting a position pointer to the outer peripheral surface of the worm wheel shaft so that it protrudes outward, thereby realizing visual monitoring of the rotation position of the worm wheel and further realizing visual monitoring of the valve opening position, thereby avoiding the transmission angle deviation problem caused by the coaxial connection between the pointer and the worm wheel.

[0064] The present invention aims to provide a worm gear and its components for a temperature-controlled valve reduction mechanism, which solves the problem of waterproof sealing caused by an external position pointer, and also solves the problem of reduced position feedback accuracy caused by wear of the position contacts and the non-adjustability of the position contacts. At the same time, it also solves the problem of excessive volume and weight of the valve reducer caused by the traditional combination of the reduction mechanism and the position feedback and indication mechanism.

[0065] In some embodiments,

[0066] The position pointer 5 has a central axis, and the central axis is perpendicular to the central axis of the worm gear shaft 6 , so that the position pointer 5 protrudes outward from the outer peripheral surface of the worm gear shaft 6 along the radial direction of the worm gear shaft 6 .

[0067] The central axis of the position pointer of the present invention is preferably perpendicular to the central axis of the worm gear shaft, which can improve the accuracy of visual monitoring.

[0068] In some embodiments,

[0069] The outer peripheral surface of the worm gear shaft 6 is provided with a second mounting hole 2-6 facing the inside thereof, and the position pointer 5 includes a second connecting portion 5-1 and a pointer portion 5-2, the second connecting portion 5-1 is fixedly connected to the second mounting hole 2-6 (preferably by plug-in fitting), and the pointer portion 5-2 protrudes from the second mounting hole 2-6.

[0070] The present invention can form a plug-in fit between the second mounting hole on the worm gear shaft and the second connecting part of the position pointer through the structural form of the two, thereby completing the effect of installing the position pointer on the worm gear shaft, and the pointer part is used to indicate the real-time position of the worm gear rotation.

[0071] The second mounting hole 2-6 of the present invention is preferably perpendicular to the axis of the worm wheel and coincides with the central plane of the worm wheel sector, and its indicated position expresses the opposite direction position of the worm wheel center.

[0072] In some embodiments,

[0073] The second connecting portion 5-1 is a threaded cylindrical structure with an external thread, and the second mounting hole 2-6 has an internal thread. The second connecting portion 5-1 is threadedly connected to the second mounting hole 2-6.

[0074] like Figure 5As shown, the position pointer of the present invention is composed of a stud (second connecting part 5-1) matched with the threaded hole of the worm gear shaft (second mounting hole 2-6) and a pointer part 5-2. The stud is used to assemble the pointer and the worm gear into a whole. When the worm gear is working, the pointer part 5-2 will rotate around the turbine shaft, and its indicated position marks the rotation position of the worm gear. The reason why threads are preferred here instead of other non-detachable fixing methods is that during normal installation, the worm gear assembly is first installed in the reduction box, and then the pointer is installed on the worm gear shaft. When disassembly is required, the pointer is removed first, and then the worm gear assembly can be removed. Figure 5 shown.

[0075] In some embodiments,

[0076] The worm wheel 2 is also provided with a weight-reducing hole 2 - 3 extending through the worm wheel 2 from one axial end face to the other axial end face.

[0077] The present invention can also effectively reduce the weight of the temperature control valve by arranging a weight-reducing hole on the worm gear.

[0078] In some embodiments,

[0079] The width of the weight-reducing hole 2 - 3 along the radial direction does not exceed 1 / 3 of the radius of the worm wheel 2 ; or, there are multiple weight-reducing holes 2 - 3 , and the sum of the widths of the multiple weight-reducing holes 2 - 3 along the radial direction does not exceed 1 / 3 of the radius of the worm wheel 2 .

[0080] The present invention can reduce the weight of the worm gear while ensuring its structural strength through such an arrangement.

[0081] In some embodiments,

[0082] The worm gear shaft 6 also includes a first stepped shaft segment 2-2 and a second stepped shaft segment 2-5, wherein the first stepped shaft segment 2-2 is located at one axial end of the worm gear shaft 6, and the second stepped shaft segment 2-5 is located between the worm gear 2 and the position pointer 5. The worm gear assembly also includes a first bearing 1 and a second bearing 4, wherein the first bearing 1 is sleeved on the first stepped shaft segment 2-2, and the second bearing 4 is sleeved on the second stepped shaft segment 2-5, so that the worm gear 2 is located between the first bearing 1 and the second bearing 4.

[0083] The present invention can support the worm shaft and the worm wheel on the support through the structural form of two stepped shaft sections, thereby meeting the purpose and effect of rotation support.

[0084] Figure 1As shown, the worm gear assembly of the present invention is composed of a small bearing (first bearing 1), a worm wheel 2, a position contact 3, a large bearing (second bearing 4) and a position pointer 5. The first bearing and the second bearing are respectively connected to the stepped shaft section of the worm wheel shaft through interference fit, and the position contact and the position pointer are respectively connected to the end of the worm wheel sector and the worm wheel shaft through threads.

[0085] Figure 2 and Figure 3 As shown, the worm gear assembly of the present invention is composed of a countersunk hole 2-1 installed by interference fit, a first stepped shaft section 2-2, a weight-reducing hole 2-3 of the worm gear sector, two first mounting holes 2-4 located on the side of the worm gear sector, a second stepped shaft section 2-5, a second mounting hole 2-6, a guide boss 2-7 for coaxially transmitting torque between the worm gear and the valve body, and worm gear teeth 2-8.

[0086] The present invention further provides a temperature control valve, which includes the aforementioned worm gear assembly and a valve flap, wherein the worm gear shaft 6 is connected to the valve flap and can rotate integrally with the valve flap.

[0087] The present invention aims to provide a worm gear and its assembly of a temperature control valve speed reduction mechanism, wherein the worm gear assembly is directly connected to the temperature control valve disc and coaxially drives the worm gear, and the output of the position signal is realized by integrating a trigger contact that can trigger a micro switch on the worm gear, and the position pointer is installed on the worm gear shaft to realize the visual monitoring of the valve opening position. The position signal output and position visualization of the worm gear assembly are reliable, high-precision, simple in production process, and low in cost.

[0088] The present invention further designs the end of the worm gear shaft to be a guide boss 2-7 that can be connected to the valve disc shaft and can transmit torque, thereby realizing the coaxial one-way transmission and position self-locking function of the worm gear and the valve disc, and realizing integrated rotation.

[0089] The temperature control valve of the present invention, when the valve disc is normally closed, preferably when the valve disc is turned out, is in the normally closed position, the contact on the worm gear touches the micro switch, generates a normally closed signal, touches the micro switch set on the housing, and sends a normally closed signal.

[0090] The position contact of the present invention is installed at the end of the worm wheel sector by a thread and is perpendicular to the center line of the worm wheel. In actual work, when the top of the contact wears due to the long-term triggering of the position feedback mechanism by the position contact, the wear error can be compensated by adjusting the screw-in depth of the thread to improve the feedback accuracy of the valve opening position signal. The position pointer is connected to the end of the worm wheel sector by a thread, or other detachable connection methods. After the worm wheel assembly is installed in the reduction box, the pointer is screwed into the corresponding mounting threaded hole on the worm wheel shaft. When the temperature control valve needs to be disassembled, the pointer must be removed before the worm wheel assembly can be disassembled.

[0091] The present invention also provides an air cycle machine, which comprises the aforementioned temperature control valve.

[0092] The worm gear and its assembly of the temperature control valve speed reduction mechanism of the present invention relate to the technical field of air circulation refrigeration of special refrigeration equipment. The worm gear assembly is directly connected to the temperature control valve disc and coaxially drives, and the output of the position signal is realized by integrating a contact that can trigger a micro switch on the worm gear, and the position pointer is installed on the worm gear shaft to realize visual monitoring of the valve opening position.

[0093] The present invention has the following beneficial effects:

[0094] 1. The present invention connects the contact that can trigger the micro switch to generate a position feedback signal to the characteristic position of the worm gear through a thread, thereby realizing the temperature control valve flap position detection function; the contact that can trigger the micro switch to generate a position feedback signal is connected to the characteristic position of the worm gear through a thread, thereby solving the problem of reduced signal feedback caused by wear caused by long-term triggering of the contact;

[0095] 2. The present invention directly connects the position pointer to the worm gear shaft through a thread, thereby realizing visual detection of the valve flap opening and achieving a waterproof sealing effect; the above-mentioned functions are implemented reliably, with high precision, simple production process, and low cost, and can reduce the volume and weight of the valve reduction mechanism.

[0096] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A worm gear assembly capable of feedback of position, characterized in that: include: A worm gear (2) and a feedback position contact (3), wherein the worm gear (2) is a fan-shaped column structure, and its cross-sectional area is a fan-shaped structure. The feedback position contact (3) is arranged on an end face of one circumferential side of the fan-shaped column structure, and the feedback position contact (3) protrudes from the end face of one circumferential side of the fan-shaped column structure so as to be able to sense with a micro switch and feedback the position signal of the worm gear (2). The feedback position contact (3) comprises a first connecting portion (3-1) which is connected to the fan-shaped column structure in cooperation with the fan-shaped column structure. The end face of one circumferential side of the fan-shaped column structure is provided with a first mounting hole (2-4) facing the inside of the fan-shaped column structure. The first connecting portion (3-1) is connected to and cooperates with the first mounting hole (2-4) so ​​as to control the first connecting portion (3-1) located in the first mounting hole (2-4) to extend out of the end face of one circumferential side by a preset length when the length of the part of the feedback position contact (3) protruding from the end face of one circumferential side is worn and shortened.

2. The worm gear assembly capable of position feedback according to claim 1, characterized in that: The outer periphery of the first connecting portion (3-1) is provided with an external thread, the first mounting hole (2-4) is a threaded hole, and the first connecting portion (3-1) is threadedly connected to the first mounting hole (2-4) so ​​that when the length of the portion of the feedback position contact (3) protruding from the end surface of one circumferential side is worn and shortened, the feedback position contact (3) can be controlled to rotate so that the connection section located in the first mounting hole (2-4) protrudes from the end surface of one circumferential side by a preset length.

3. The worm gear assembly capable of position feedback according to claim 1, characterized in that: The worm wheel (2) has a first circumferential end surface located on one circumferential side thereof and a second circumferential end surface located on the other circumferential side thereof. There are two feedback position contacts (3), one of which is arranged on the first circumferential end surface and protrudes from the first circumferential end surface, and the other feedback position contact (3) is arranged on the second circumferential end surface and protrudes from the second circumferential end surface.

4. The worm gear assembly capable of position feedback according to any one of claims 1 to 3, characterized in that: In the projection plane of the axial end face, the worm wheel (2) is a fan-shaped structure with a central angle less than 180°; and / or the outer peripheral surface of the worm wheel (2) is also provided with worm wheel teeth (2-8) that can mesh with worm gear teeth.

5. The worm gear assembly capable of position feedback according to any one of claims 1 to 4, characterized in that: It also includes a worm gear shaft (6), the worm gear (2) having a cylindrical hole structure, the worm gear shaft (6) passing through the cylindrical hole structure, and enabling the worm gear (2) to rotate integrally with the worm gear shaft (6); and a position pointer (5) is provided on the outer peripheral surface of the worm gear shaft (6) at a position where the worm gear (2) is not provided, and the position pointer (5) can display the rotation position of the worm gear (2).

6. The worm gear assembly capable of position feedback according to claim 5, characterized in that: The position pointer (5) has a central axis, and its central axis is perpendicular to the central axis of the worm gear shaft (6), so that the position pointer (5) protrudes outward from the outer peripheral surface of the worm gear shaft (6) along the radial direction of the worm gear shaft (6).

7. The worm gear assembly capable of position feedback according to claim 5, characterized in that: The outer peripheral surface of the worm gear shaft (6) is provided with a second mounting hole (2-6) facing the inside thereof, and the position pointer (5) comprises a second connecting portion (5-1) and a pointer portion (5-2), wherein the second connecting portion (5-1) is fixedly connected to the second mounting hole (2-6), and the pointer portion (5-2) protrudes from the second mounting hole (2-6).

8. The worm gear assembly capable of position feedback according to claim 7, characterized in that: The second connection portion (5-1) is a threaded column structure having an external thread, the second mounting hole (2-6) has an internal thread, and the second connection portion (5-1) is threadedly matched with the second mounting hole (2-6).

9. The worm gear assembly capable of position feedback according to claim 5, characterized in that: The worm wheel (2) is also provided with a weight-reducing hole (2-3) extending through the worm wheel (2) from one axial end face to the other axial end face.

10. The worm gear assembly capable of position feedback according to claim 9, characterized in that: The width of the weight-reducing hole (2-3) in the radial direction does not exceed 1 / 3 of the radius of the worm wheel (2); or, there are multiple weight-reducing holes (2-3), and the sum of the widths of the multiple weight-reducing holes (2-3) in the radial direction does not exceed 1 / 3 of the radius of the worm wheel (2).

11. The worm gear assembly capable of position feedback according to claim 5, characterized in that: The worm gear shaft (6) further comprises a first stepped shaft section (2-2) and a second stepped shaft section (2-5), wherein the first stepped shaft section (2-2) is located at one axial end of the worm gear shaft (6), and the second stepped shaft section (2-5) is located between the worm gear (2) and the position pointer (5), and the worm gear assembly further comprises a first bearing (1) and a second bearing (4), wherein the first bearing (1) is sleeved on the first stepped shaft section (2-2), and the second bearing (4) is sleeved on the second stepped shaft section (2-5), so that the worm gear (2) is located between the first bearing (1) and the second bearing (4).

12. A temperature control valve, characterized in that: The worm gear assembly comprises the worm gear assembly according to any one of claims 5 to 11, and further comprises a valve flap, wherein the worm gear shaft (6) is connected to the valve flap and can rotate integrally with the valve flap.

13. An air cycle machine, characterized in that: Including the temperature control valve as described in claim 12.

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