WO2023083329A1 - 干衣机 - Google Patents

干衣机 Download PDF

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Publication number
WO2023083329A1
WO2023083329A1 PCT/CN2022/131512 CN2022131512W WO2023083329A1 WO 2023083329 A1 WO2023083329 A1 WO 2023083329A1 CN 2022131512 W CN2022131512 W CN 2022131512W WO 2023083329 A1 WO2023083329 A1 WO 2023083329A1
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WO
WIPO (PCT)
Prior art keywords
pressure relief
relief hole
clothes dryer
volute
air
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PCT/CN2022/131512
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English (en)
French (fr)
Inventor
曹正
高科科
龚纯
李清
Original Assignee
广东美的白色家电技术创新中心有限公司
无锡小天鹅电器有限公司
美的集团股份有限公司
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Priority claimed from CN202122772797.5U external-priority patent/CN217758033U/zh
Priority claimed from CN202111341168.5A external-priority patent/CN116122029A/zh
Application filed by 广东美的白色家电技术创新中心有限公司, 无锡小天鹅电器有限公司, 美的集团股份有限公司 filed Critical 广东美的白色家电技术创新中心有限公司
Publication of WO2023083329A1 publication Critical patent/WO2023083329A1/zh

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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F58/00—Domestic laundry dryers
    • D06F58/10—Drying cabinets or drying chambers having heating or ventilating means

Definitions

  • the disclosure belongs to the technical field of household appliances, and in particular relates to a clothes dryer.
  • the clothes dryer uses circulating hot air to blow the hot air into the drying drum where the clothes are stored, and the water vapor evaporated from the clothes is condensed into water through the condenser, and then discharged from the machine, the steam that removes moisture is reheated, and then It is introduced into the drying drum and circulated in this way to form the hot air circulation system of the dryer.
  • the sealing device in the prior art has assembly errors, and after a long time of use, the sealing effect between the hot air circulation system of the clothes dryer and the drying barrel is poor, which affects the drying effect of the clothes dryer and affects the user experience.
  • the present disclosure provides a clothes dryer, aiming at at least to a certain extent solving the technical problems of poor sealing effect between the hot air circulation system of the clothes dryer and the drying drum, affecting the drying effect of the clothes dryer, and affecting user experience.
  • the present disclosure provides a clothes dryer.
  • the clothes dryer includes: a volute provided with an air inlet, an accommodating cavity, and an air outlet section, the air outlet section provided with an air outlet; a fan arranged in the volute In the accommodating chamber; the drying barrel, the air outlet of the volute communicates with one axial end of the drying barrel, and the air inlet of the volute communicates with the other axial end of the drying barrel through an air duct , to form a circulating air path, the positive pressure section of the circulating air path is provided with a pressure relief hole.
  • the clothes dryer provided by the present disclosure can reduce the internal pressure of the clothes dryer in the clothes dryer because of the pressure relief hole is provided on the positive pressure section of the circulating air path, thereby greatly reducing the drying time of the clothes dryer.
  • the leakage amount of the dynamic seal at both ends of the clothes bucket can improve the sealing effect of the two ends of the clothes dryer, so as to improve the drying effect of the clothes dryer and improve the user experience.
  • Fig. 1 shows a schematic structural diagram of a clothes dryer according to some embodiments of the present disclosure
  • Fig. 2 shows a schematic diagram of the principle of a hot air circulation system according to some embodiments of the present disclosure
  • Fig. 3 shows the leakage characteristic curve at both ends of a drying drum of a certain prototype
  • Fig. 4 is a schematic diagram of the setting principle of the pressure relief hole
  • Fig. 5 is a schematic diagram of the back structure of the clothes dryer shown in Fig. 1;
  • Fig. 6 is a schematic diagram of the assembly of the first support and the volute in Fig. 5 .
  • the end of the drying drum of the clothes dryer in the related art will be provided with a sealing structure, and the sealing structure of the related art
  • radial dynamic sealing or end face dynamic sealing is adopted, that is, the support ring of the drying bucket of the clothes dryer is provided with a seal that contacts the end of the drying bucket of the drying machine radially or axially, but when dry
  • the end of the drying drum of the clothes machine is sleeved on the above-mentioned support ring, there will be radial or axial assembly errors between them, and there will be radial and axial jumps in the rotation of the drying drum, resulting in the end of the drying drum
  • the seal is uneven, that is, the gap between the end of the drying drum and the contact part of the support ring is small, and the gap at other parts is large, and with the prolongation of working time, the sealing strip is constantly worn,
  • Fig. 1 shows a schematic structural diagram of a clothes dryer according to some embodiments of the present disclosure.
  • the clothes dryer mainly includes a clothes dryer barrel 1, a door body 2, a filter screen 3, a second support 4, a condenser 5, an evaporator 6, a base 7, a fan 8, a volute 9, and a first gasket 10.
  • the second gasket 11 , the first support 12 , the outer casing 13 and the electric control board 14 When using the clothes dryer, the rolling drying barrel 1 rotates at a certain speed to tumble the clothes.
  • the condenser 5 works, and the hot air generated is introduced into the volute 9 through the activated fan 8, and then passes through the volute 9.
  • the hot air enters the drying drum 1 where the clothes are stored, and the water vapor evaporated from the clothes is introduced into the evaporator 6 through the air duct to condense into water, and then discharged from the machine, and the steam that removes moisture is introduced into the condenser 5 is heated, and the fan 8 that is started again is introduced into the volute 9, and circulates in this way to form a hot air circulation system of the clothes dryer.
  • the door body 2 is opened to take out the dried clothing.
  • the drying drum 1 needs to be rotated to roll the clothes.
  • the opening direction of the axial front end of the drying drum 1 is in contact with the second support 4, and the sealing structure on the second support 4 is in contact with the second gasket 11 to form a dynamic seal.
  • the axial rear end of the drying drum 1 is in contact with the first support 12, and the sealing structure on the first support 12 is used to contact the first gasket 10 to form a dynamic seal on the end face to form a rear seal.
  • the front and first gaskets of the clothes bucket 1 are sealed to prevent the air volume of the air duct system from leaking out of the clothes drying bucket.
  • the first support 12 may be the rear shell of the outer shell 13
  • the second support 4 may be the front shell of the outer shell 13 .
  • control board 14 is outside the hot air circulation system and inside the outer shell 13, so the high temperature and high humidity gas leaking from the front and rear dynamic seals of the drying drum 1 will fill the hot air circulation system and the space inside the outer shell, Affect the reliability of the control board 14, and condense into water on the wall surface of the housing.
  • the door body 2 is installed on the second support 4, and after the door body 2 is closed, the clothes and hot air can be prevented from leaking from the door body 2;
  • a filter screen 3 is provided on the pipeline connecting the drying drum 1 and the evaporator to filter dander and prevent impurities such as dander from entering the evaporator 6 .
  • the filter screen 3 can be installed on the second support 4, and the filter screen 3 can be taken out conveniently, so as to clean impurities such as dander.
  • the evaporator 6 and the condenser 5 of the hot air circulation system are successively installed on the air duct provided by the base 7, and the fan 8 is driven by a motor to rotate and cooperate with the volute 9 to provide air pressure and air volume for the hot air circulation system.
  • Fig. 2 shows a schematic diagram of the principle of a hot air circulation system according to some embodiments of the present disclosure.
  • the flow direction of the internal circulating air of the hot air circulation system is shown by the arrow in Fig. 2, which can provide the fan 8 with a wind pressure power of 500 Pa, and flow from the inlet of the fan 8 to the outlet (the inlet of the fan is negative pressure, and the outlet is positive.
  • the hot air flowing out of the fan 8 enters the drying drum 1 from the rear end of the drying drum 1, flows out from the front of the drying drum 1 (the inside of the drying drum is under positive pressure), passes through the filter screen 3, and then flows to the evaporator 6 , the condenser 5 returns to the inlet of the fan 8 to form a circulation.
  • the leakage Q at both ends of the drying drum 1 is determined by the following formula: Among them, Q leakage is the leakage at both ends of the drying drum; K is the leakage coefficient of the leakage hole, A is the size of the leakage hole, n is the characteristic coefficient of the leakage hole, which is related to the shape of the leakage hole, and its value is usually 1.2 to 2 Between, it is a certain value; P barrel is the pressure inside the drying barrel, its size is determined by the sealing characteristics of the dryer system; Po is the atmospheric pressure outside the drying barrel, it is a certain value, which is taken as 0.
  • the leakage of the clothes dryer is mainly determined by the leakage characteristics of its sealing position and the internal pressure of the barrel, so the leakage can be reduced by the following two methods:
  • Reducing the leakage coefficient K of the leakage hole can reduce the leakage amount, that is, the commonly used method in the related art, that is, by improving the seal at both ends of the drying drum, the leakage coefficient K is reduced, thereby reducing the leakage amount.
  • This way of reducing leakage by increasing the sealing at both ends of the drying drum will increase the rotation resistance of the drying drum and increase the power of the motor, and the scheme is complicated, the cost is high, and the improvement effect is not very obvious;
  • the relationship between the leakage amount and the internal pressure of the drum can also be obtained through experimental testing, such as testing the leakage characteristic curve at both ends of a drying drum of a certain prototype (as shown in Figure 3), and fitting the relationship between the leakage amount and the internal pressure of the drum: :
  • the Q leakage is the leakage at both ends of the drying drum
  • the P drum is the pressure in the drying drum.
  • the clothes dryer shown in the present disclosure achieves the purpose of reducing the leakage at both ends of the drying barrel by reducing the inner pressure of the barrel.
  • a pressure relief hole is provided on the positive pressure section of the circulating air path, and the internal pressure of the drying barrel is reduced through the pressure relief hole to reduce the leakage at both ends of the drying barrel. Purpose.
  • Fig. 4 is a schematic diagram of the setting principle of the pressure relief hole.
  • the clothes dryer provided by the present disclosure includes a volute 9, a fan 8 and a clothes drying bucket 1.
  • the volute 9 is provided with an air inlet 901, an accommodation chamber 902 and an air outlet section 903, the air outlet section 903 is provided with an air outlet 904,
  • the fan 8 is arranged in the accommodation chamber 902 of the volute 9, and the air outlet of the volute 9 904 is connected to one axial end of the drying barrel 1, and the air inlet 904 of the volute 9 is connected to the other axial end of the drying barrel 1 through an air duct to form a circulating air path.
  • the positive pressure section of the circulating air path is provided with There are pressure relief holes.
  • the rolling drying barrel 1 rotates at a certain speed to tumble the clothes.
  • the hot air is introduced into the volute 9 through the activated fan 8, and guided by the volute 9, the hot air enters the clothes storage compartment.
  • the water vapor evaporated from the clothes is introduced into the volute 9 by the fan 8 which is activated again after the water is removed, and circulates like this to form a hot air circulation system of the clothes dryer.
  • the specific air circulation please refer to the above description, and no more details will be given here.
  • the positive pressure section of the circulating air path of the clothes dryer is provided with a pressure relief hole, the inner pressure of the clothes dryer can be reduced, and the drying capacity of the clothes dryer can be greatly reduced.
  • the leakage of the dynamic seal at both ends of the drying drum can improve the sealing effect between the hot air circulation system of the dryer and the drying drum, so as to improve the drying effect of the dryer and improve the user experience.
  • the circulating air path between the outlet of the fan 8 and the filter screen 3 is the positive pressure section of the circulating air path, and a pressure relief hole of a suitable size is set at this position to realize Reduce the internal pressure P barrel in the drying barrel of the clothes dryer, and control the pressure in the drying barrel of the dryer to less than 120Pa, which can greatly reduce the leakage of the dynamic seal at both ends of the drying barrel of the dryer .
  • one or more pressure relief holes can be provided, and corresponding settings can be made according to the specific structure of the clothes dryer, and the specific setting positions are described in detail below.
  • the size of the pressure relief hole is the key factor to reduce the leakage of the dynamic seal at both ends of the dryer drum, and also an important factor affecting the drying efficiency. This is because: if the pressure relief hole is too large, although it can Significantly reduce the leakage of the dynamic seal at both ends of the drying drum of the dryer, but it will also reduce the amount of hot air entering the drying drum and affect the drying efficiency; on the contrary, if the pressure relief hole is too small, although it can ensure The amount of hot air in the clothes bucket can ensure the drying efficiency, but the effect of improving the leakage of the dynamic seal at both ends of the clothes dryer’s drying bucket is not obvious.
  • the area of the pressure relief hole can be set to 20-1500mm 2 , can ensure that the inner pressure of the drying drum is less than 120Pa, and then can ensure that the leakage of the dynamic seal at both ends of the drying drum of the dryer can be greatly reduced, and the amount of hot air entering the drying drum can also be guaranteed to ensure drying efficiency.
  • the shape of the pressure relief hole there is no specific limitation, and it can be circular, oval, waist-circular, square or special-shaped, as long as the opening area is guaranteed.
  • it is necessary to ensure that the sum of the areas of the multiple pressure relief holes is within the above-mentioned setting range.
  • the pressure relief hole is a circular hole with a diameter of 20mm
  • the internal pressure of the barrel before opening the hole is 170Pa
  • the internal pressure of the barrel after opening the hole is 80Pa, which can meet the above requirements.
  • the pressure relief hole is arranged on the air outlet section 903 of the volute 9 , specifically on the air outlet section of the volute 9 passing through the volute tongue (at the box position in FIG. 1 ).
  • FIG. 5 is a schematic diagram of the back structure of the clothes dryer shown in FIG. 1
  • FIG. 6 is a schematic diagram of the assembly of the first support and the volute in FIG. 5 . 4 and 5, a pressure relief hole is provided on the side of the air outlet section 903 of the volute 9 that is not facing the drying drum 1 (that is, the side of the volute 9 or the side facing away from the drying drum 1).
  • the air outlet section 903 of the shell 9 belongs to a part of the positive pressure section of the circulating air path, and the pressure relief hole is the first pressure relief hole 15, and the pressure relief hole at this position has little influence on the condensation efficiency and energy efficiency.
  • the embodiment of the present application does not limit the shape and quantity of the first pressure relief holes 15 .
  • the pressure relief hole is provided on the first support 12 for supporting one end of the drying bucket 1 in the axial direction, and the pressure relief hole is located on the peripheral surface of the drying bucket 1 Between the air inlet hole opened on the first support 12 for connection with the volute 9, that is, the pressure relief hole is set on the first sealing gasket 10 and the first support 12 for connection with the volute 9 Between the air inlet holes, the pressure relief hole is the second pressure relief hole 16.
  • the pressure relief hole can also be arranged on the peripheral surface of the air passage between the drying bucket 1 and the filter screen 3, and the pressure relief hole is the third pressure relief hole.
  • the pressure relief hole includes the above-mentioned first pressure relief hole 15 and the above-mentioned second pressure relief hole 16 .
  • the pressure relief hole includes the above-mentioned first pressure relief hole 15 and the third pressure relief hole.
  • the pressure relief hole includes the above-mentioned second pressure relief hole 16 and the above-mentioned third pressure relief hole.
  • the pressure relief hole includes the above-mentioned first pressure relief hole 15 , the second pressure relief hole 16 and the above-mentioned third pressure relief hole.
  • the size of the pressure relief hole should be considered in consideration of the energy efficiency requirements of the system, the condensation temperature of the compressor, and the discharge temperature. That is, if the hole is too large, the condensation temperature and discharge temperature of the system will be reduced; The condensing temperature and exhaust temperature are not too high or too low, which will affect the system performance.
  • the area of the pressure relief hole can be determined:
  • the clothes dryer with the above-mentioned hot air circulation system has a simple and easy-to-implement scheme for reducing the leakage of the dynamic seal at both ends of the drying barrel, which can reduce the air volume at both ends of the drying barrel from leaking into the dryer, and improve
  • the dryer is reliable and the effect is obvious, so as to ensure that there is no moisture leakage in the dryer, improve the reliability of electrical components, and not increase power consumption, which helps to improve user experience.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)

Abstract

一种干衣机，包括蜗壳(9)、风机(8)以及干衣桶(1)，蜗壳(9)设置有进风口(901)、容纳腔(902)以及出风段(903)，蜗壳(9)的出风段(903)设置有出风口(904)，风机(8)设置在蜗壳(9)的容纳腔(902)中，蜗壳(9)的出风口(904)和干衣桶(1)的轴向一端连通，蜗壳(9)的进风口(901)和干衣桶(1)的轴向另一端连通，蜗壳(9)的进风口(901)和干衣桶(1)的轴向另一端之间的正压段上设置有泄压孔(15、16)。该干衣机可改善干衣效果，提高用户体验。

Description

干衣机
相关申请的交叉引用
本申请要求于2021年11月12日提交、申请号为202111341168.5且名称为“干衣机”以及2021年11月12日提交、申请号为202122772797.5且名称为“干衣机”的中国专利申请的优先权，其全部内容通过引用合并于此。
技术领域
本公开属于家用电器技术领域，具体涉及一种干衣机。
背景技术
干衣机通过使用循环热风，将热风吹入存放衣服的干衣桶内，把衣服蒸发出来的水蒸汽，通过冷凝器凝结成水，然后从机内排出，去除水分的蒸汽再加热后，再被引入到干衣桶内，如此循环，形成干衣机的热风循环系统。
为加快衣服的干衣速度，提高干衣均匀性，避免热风仅带出表层衣物水份，通常要求干衣桶以一定的转速旋转，以翻滚衣物，达到快速、均匀干衣的目的。因干衣桶与风道系统之间会相对运动，这就要求在干衣机热风循环系统和干衣桶之间设置密封装置，尽可能的减少循环热风的泄漏。
现有技术中的密封装置，存在装配误差，长时间使用后干衣机热风循环系统和干衣桶之间密封效果差，影响干衣机的干衣效果，影响用户体验。
发明内容
本公开提供一种干衣机，旨在至少一定程度上解决干衣机热风循环系统和干衣桶之间密封效果差，影响干衣机的干衣效果，影响用户体验的技术问题。
本公开提供了一种干衣机，所述干衣机包括：蜗壳，设置有进风口、容纳腔以及出风段，所述出风段设置有出风口；风机，设置在所述蜗壳的容纳腔中；干衣桶，所述蜗壳的出风口和所述干衣桶的轴向一端连通，所述蜗壳的进风口和所述干衣桶的轴向另一端通过风道连通，以形成循环风路，所述循环风路的正压段上设置有泄压孔。
本公开内容所提供的干衣机，由于在循环风路的正压段上设置有泄压孔，可实现降低干衣机的干衣桶内的桶内压，进而可大幅降低干衣机干衣桶两端动密封的泄漏量，提高干衣机的干衣桶两端的密封效果，以改善干衣机的干衣效果，提高用户体验。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的 前提下，还可以根据这些附图获得其他的附图。
图1示出了依据本公开一些实施例的干衣机的结构示意图；
图2示出了依据本公开一些实施例的热风循环系统的原理示意图；
图3示出了某样机干衣桶两端的泄漏特性曲线；
图4为泄压孔的设置原理示意图；
图5为图1所示的干衣机的背部结构示意图；
图6为图5中的第一支撑和蜗壳的装配示意图。
具体实施方式
为了解决干衣机的热风循环系统和干衣桶之间的密封，以尽可能的减少循环热风的泄漏，相关技术中的干衣机的干衣桶端部会设置密封结构，相关技术的密封结构通常采用径向动密封或端面动密封方式，即在干衣机的干衣桶的支撑环上设置有与干衣机的干衣桶端部径向或轴向接触的密封件，但当干衣机的干衣桶端部套设到上述支撑环上之后，它们之间会产生径向或轴向的装配误差，干衣桶旋转存在径向及轴向跳动，导致干衣桶的端部密封不均匀，即干衣桶端部与支撑环接触部部分位置分缝隙小，其他部分位置缝隙大，且随着工作时间的延长，密封条不断磨损，将导致干衣桶端部密封越来越不均匀，泄漏约来越大。
类似为改善干衣桶端面密封的相关专利很多，(如 CN201210559400.7)，其或者增加成本，或者改善不明显。
若干衣桶的两端的高温高湿气体泄漏，会对干衣机带来多方面的不利影响，具体如下：
(1)干衣桶内的高温高湿空气泄漏，会将大量的热能及水蒸汽排出，造成风道系统能量损失，带来干衣机能耗的提升，降低冷凝效率；
(2)泄漏出的高温高湿蒸汽，进入干衣机风道系统和外壳之间，外壳内存在有较多的控制板、电子元器件，泄漏出的湿气会影响电器元件等的可靠性，使得干衣机损坏；
(3)泄漏的高温高湿气体会在金属外壳板上冷凝成水，大量的冷凝水从干衣机内流出会给消费者带来担忧，影响使用体验。
因此，需对相关技术进行改进。
图1示出了依据本公开一些实施例的干衣机的结构示意图。结合图1，该干衣机主要包括干衣桶1、门体2、过滤网3、第二支撑4、冷凝器5、蒸发器6、底座7、风机8、蜗壳9、第一密封垫10、第二密封垫11、第一支撑12、外壳体13以及电控板14。在使用干衣机时，滚动的干衣桶1以一定的转速旋转，以翻滚衣物，同时，冷凝器5工作，产生的热风经启动的风机8引入到蜗壳9中，经蜗壳9的引导，热风进入到存放衣服的干衣桶1内，把衣服蒸发出来的水蒸汽，通过风道引入到蒸发器6 中凝结成水，然后从机内排出，去除水分的蒸汽再引入到冷凝器5加热，再次被启动的风机8引入到蜗壳9中，如此循环，形成干衣机的热风循环系统，存放在干衣桶内衣服烘干后，将门体2打开，以取出烘干后的衣服。
结合图1，干衣桶1需要旋转以翻滚衣服，干衣桶1的轴向前端开口方向与第二支撑4接触，利用第二支撑4上的密封结构与第二密封垫11接触形成动密封，以构成前密封；干衣桶1的轴向后端与第一支撑12接触，利用第一支撑12上的密封结构与第一密封垫10接触形成端面动密封，以构成后密封，通过干衣桶1的前、第一密封垫密封，以防止风道系统风量向干衣桶外泄漏。
结合图1，第一支撑12可以为外壳体13的后壳，第二支撑4可以为外壳体13的前壳。
结合图1，控制板14在热风循环系统外，且位于外壳体13内，因此从干衣桶1的前、后动密封泄漏的高温高湿气体，会充满热风循环系统和外壳体内的空间，影响控制板14的可靠性，并在外壳壁面上冷凝成水。
结合图1，门体2安装在第二支撑4上，关闭门体2后，可以防止衣物、热风从门体2处泄漏；经过干衣桶1内的衣物的热风含有毛屑等 杂质，因此，在干衣桶1和蒸发器连接的管路上设置有过滤网3，以过滤毛屑，防止毛屑等杂质进入蒸发器6。过滤网3可安装在第二支撑4上，过滤网3并可方便的取出，以便清理毛屑等杂质。
结合图1，热风循环系统的蒸发器6、冷凝器5依次安装在底座7设置的风道上，风机8通过电机驱动旋转，与蜗壳9配合，为热风循环系统提供风压与风量。
图2示出了依据本公开一些实施例的热风循环系统的原理示意图。结合图2，热风循环系统的内循环风的流向如图2中箭头所示，可以为风机8提供动力500Pa的风压动力，从风机8入口流向出口(风机的入口为负压，出口为正压)，流出风机8的热风，从干衣桶1的后端进入干衣桶1，从干衣桶1的前流出(干衣桶内为正压)，经过过滤网3后流向蒸发器6、冷凝器5回到风机8入口，形成循环。
根据理论分析，干衣桶1两端的泄漏量Q 漏大小由下式决定：
Figure PCTCN2022131512-appb-000001
Figure PCTCN2022131512-appb-000002
其中，Q 漏为干衣桶两端的泄漏量；K为泄漏孔的泄漏系数，A为泄漏孔的大小，n为泄漏孔的特性系数，与泄漏孔的形状有关，其值通常为1.2～2之间，为一定值；P 桶为干衣桶内的压力，其大小由干衣机系统密封特性决定；Po为干衣桶外的大气压力，为一定值，取为0。
通过上式可以看出，干衣机的泄漏主要有其密封位置的泄漏特性及桶内压决定，故可以通过下述两种方法来降低泄漏量：
a、减小泄漏孔泄漏系数K，可以降低泄漏量，即相关技术中常用的方法，即通过改善干衣桶两端的密封，降低泄漏系数K，进而降低泄漏量。此种在干衣桶两端通过增加密封性减小泄漏的方式会增加干衣桶旋转阻力，增大电机功率，且方案复杂，成本高，改善效果并不十分明显；
b、降低干衣桶内的压力P 桶，其泄漏量也可以大幅降低。
上述泄漏量与桶内压的关系也可以通过实验测试得到，如测试某样机干衣桶两端的泄漏特性曲线(如图3所示)，并拟合可得到泄漏量与桶内压的关系为：
Figure PCTCN2022131512-appb-000003
该式中Q 漏为干衣桶两端的泄漏量，P 桶为干衣桶内的压力。
本公开所示的干衣机，即是通过降低桶内压的方式来达到降低干衣桶两端泄漏量的目的。
本公开的干衣机的设计思路为：在循环风路的正压段上设置有泄压孔，通过泄压孔来降低干衣桶内压的方式来达到降低干衣桶两端泄漏量的目的。
图4为泄压孔的设置原理示意图，结合图1以及图4，本公开所提 供的干衣机，包括蜗壳9、风机8以及干衣桶1。其中，蜗壳9设置有进风口901、容纳腔902以及出风段903，出风段903上设置有出风口904，风机8设置在蜗壳9的容纳腔902中，蜗壳9的出风口904和干衣桶1的轴向一端连接，蜗壳9的进风口904和干衣桶1的轴向另一端通过风道连接，以构成循环风路，该循环风路的正压段上设置有泄压孔。
使用干衣机时，滚动的干衣桶1以一定的转速旋转，以翻滚衣物，同时，热风经启动的风机8引入到蜗壳9中，经蜗壳9的引导，热风进入到存放衣服的干衣桶1内，把衣服蒸发出来的水蒸汽，去水后再次被启动的风机8引入到蜗壳9中，如此循环，形成干衣机的热风循环系统。具体的风路循环可参考上文描述，在此不做过多赘述。
本公开所提供的干衣机，由于干衣机的循环风路的正压段上设置有泄压孔，可实现降低干衣机的干衣桶内的桶内压，可大幅降低干衣机干衣桶两端动密封的泄漏量，提高干衣机的热风循环系统和干衣桶之间密封效果，以改善干衣机的干衣效果，提高用户体验。
具体实施时，沿循环风路内的气流方向，风机8的出口至过滤网3之间的循环风路即为循环风路的正压段，在该部位设置大小合适的泄压孔，可实现降低干衣机的干衣桶内的桶内压P 桶，将干衣机的干衣桶内的压力控制在小于120Pa，进而可大幅降低干衣机的干衣桶两端动密封的 泄漏量。
在一些实施方案中，泄压孔可以设置有一个或多个，可根据干衣机的具体结构做相应性的设置即可，具体设置位置在下文有详细描述。
泄压孔的大小一方面是降低干衣机干衣桶两端动密封的泄漏量的关键因素，另外也会影响干衣效率的重要因素，这是因为：若泄压孔过大，虽然可大幅度降低干衣机的干衣桶两端动密封的泄漏量，但也会减少进入干衣桶内的热风量，影响干衣效率；反之，若泄压孔过小，虽然可保证进入干衣桶内的热风量，保证干衣效率，但对干衣机的干衣桶两端动密封的泄漏量的改善效果不明显，基于此，将泄压孔的面积可以设置为20～1500mm 2，可保证干衣桶内压小于120Pa，进而可保证可大幅度降低干衣机的干衣桶两端动密封的泄漏量的前提下，也可保证进入到干衣桶内的热风量，保证干衣效率。
至于泄压孔的形状，不作具体限制，可以为圆形、椭圆形、腰圆形、方形或者异形等，只要保证其开口面积即可。另外，在设置在有多个泄压孔的情形下，需要保证多个泄压孔的面积总和在上述设定范围内。
例如，泄压孔为圆形孔，且孔径大小为20mm，开孔前桶内压为170Pa，开孔后桶内压为80Pa，即可达到上述要求。
下面对泄压孔的设置位置进行说明：
在一些实施方案中，泄压孔设置在涡壳9的出风段903上，具体为涡壳9过涡舌后的出风口段上(如图1中方框位置上)。
图5为图1所示的干衣机的背部结构示意图，图6为图5中的第一支撑和蜗壳的装配示意图。结合图4以及图5，在涡壳9的出风段903非面向干衣桶1的侧部(即涡壳9的侧面或背向干衣桶1的侧部)设置有泄压孔，涡壳9的出风段903属于循环风路的正压段中的一部分，该泄压孔为第一泄压孔15，该位置的泄压孔可对冷凝效率、能效的影响较小。对于第一泄压孔15的形状和数量，本申请实施例不作限制。
在一些实施方案中，结合图4以及图5，泄压孔设置在用于支撑干衣桶1的轴向一端的第一支撑12上，且，该泄压孔位于干衣桶1的周面和在第一支撑12上开设的用于和蜗壳9连接的进风孔之间，即该泄压孔设置在第一密封垫10和第一支撑12上开设的用于和蜗壳9连接的进风孔之间，该泄压孔为第二泄压孔16。
在一些实施方案中，该泄压孔也可设置在干衣桶1和过滤网3之间的风道的周面上，该泄压孔为第三泄压孔。
在一些实施方案中，该泄压孔包括上述第一泄压孔15以及上述第二泄压孔16。
在一些实施方案中，该泄压孔包括上述第一泄压孔15以及第三泄 压孔。
在一些实施方案中，该泄压孔包括上述第二泄压孔16以及上述第三泄压孔。
在一些实施方案中，该泄压孔包括上述第一泄压孔15、第二泄压孔16以及上述第三泄压孔。
泄压孔的大小需综合系统能效要求、压缩机冷凝温度，排气温度考虑，即开孔过大，会降低系统冷凝温度、排气温度；因此，设置的小孔应大小合适，使得压缩机冷凝温度、排气温度不过高或过低，影响系统性能。
根据上述干衣桶两端的泄漏量的公式，在实际研发中发现，在保证干衣机冷凝效率、能效的前提下，通过泄压孔的流量不能超过总流量的20％；根据实验经验总结，Q 漏为干衣机总循环风量Q 0的10％左右，可以起到综合效果最优，即
Figure PCTCN2022131512-appb-000004
故可确定所开泄压孔的面积：
Figure PCTCN2022131512-appb-000005
Figure PCTCN2022131512-appb-000006
Figure PCTCN2022131512-appb-000007
综上所述，具有上述热风循环系统的干衣机，其减少干衣桶两端动 密封的泄漏量的方案简单，易于实施，可减少干衣桶两端风量泄漏到干衣机内部，提高干衣机可靠性，且效果明显，以保证干衣机内没有泄漏湿气，提高电器元件等可靠性，且不会增加功耗，有助于提高用户体验。
尽管已描述了本申请的优选实施例，但本领域内的普通技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (11)

  1. 一种干衣机，包括：
    蜗壳，设置有进风口、容纳腔以及出风段，所述出风段设置有出风口；
    风机，设置在所述蜗壳的容纳腔中；
    干衣桶，所述蜗壳的出风口和所述干衣桶的轴向一端连通，所述蜗壳的进风口和所述干衣桶的轴向另一端通过风道连通，以形成循环风路，所述循环风路的正压段上设置有泄压孔。
  2. 根据权利要求1所述的干衣机，其中，所述风道内设置有过滤网，沿所述循环风路内的气流方向，所述风机的出口至所述过滤网之间的循环风路为所述循环风路的正压段。
  3. 根据权利要求1所述的干衣机，其中，所述泄压孔设置有一个或多个。
  4. 根据权利要求1所述的干衣机，其中，所述泄压孔的面积为20～1500mm 2。
  5. 根据权利要求1所述的干衣机，其中，所述泄压孔设置在所述涡壳的出风段上，所述涡壳的出风段属于所述循环风路的正压段中的一部分。
  6. 根据权利要求5所述的干衣机，其中，所述泄压孔设置在所述涡壳的出风段的侧面或者背向所述干衣桶的侧部。
  7. 根据权利要求1所述的干衣机，其中，所述泄压孔设置在用于支撑所述干衣桶的轴向一端的第一支撑上，所述泄压孔位于所述干衣桶的周面和所述第一支撑上开设的用于和所述蜗壳连接的进风孔之间。
  8. 根据权利要求1所述的干衣机，其中，所述风道内设置有过滤网，所述泄压孔设置在所述干衣桶和所述过滤网之间的风道上。
  9. 根据权利要求1所述的干衣机，其中，所述泄压孔包括：
    设置在所述涡壳的出风段上的第一泄压孔；或/和，
    设置在所述干衣机上用于支撑所述干衣桶的轴向一端的第一支撑上的第二泄压孔；或/和，
    设置在所述风道上的第三泄压孔。
  10. 根据权利要求1-9任一项所述的干衣机，其中，所述泄压孔的尺寸确定方式为：
    Figure PCTCN2022131512-appb-100001
    式1)中：A为泄压孔的面积，Q 漏为干衣桶两端的泄漏量，K为泄压孔的泄漏系数，n为泄压孔的特性系数，P 桶为滚筒内的压力。
  11. 根据权利要求1-9任一项所述的干衣机，其中，所述泄压孔的尺寸确定方式为：
    Figure PCTCN2022131512-appb-100002
    式2)中：A为泄压孔的面积，Q 0为干衣机总循环风量，K为泄压孔的泄漏系数，n为泄压孔的特性系数，P 桶为滚筒内的压力。
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