Zhejiang Sanhua Climate and Appliance Controls Group Co., Ltd
대리인 / 주소
Wolf, Greenfield & Sacks, P.C.
인용정보
피인용 횟수 :
0인용 특허 :
5
초록▼
An electronic expansion valve is provided, a valve rod of which is provided with an axial through-hole in communication with a valve port, and a lateral wall of the axial through-hole of the valve seat is sealed with respect to the valve rod. An end surface of the valve rod includes a sealing surfac
An electronic expansion valve is provided, a valve rod of which is provided with an axial through-hole in communication with a valve port, and a lateral wall of the axial through-hole of the valve seat is sealed with respect to the valve rod. An end surface of the valve rod includes a sealing surface in sealing contact with an end surface at the valve port, the sealing surface includes a first sealing surface to bear an action force of refrigerant at one connecting port and a second sealing surface to bear an action force of refrigerant at another connecting port, and the effective pressure-bearing area of the first sealing surface is equal to that of the second sealing surface. Further provided is an electronic expansion valve in line contact seal with the valve seat.
대표청구항▼
1. An electronic expansion valve, wherein a valve rod is provided inside a valve cavity of the electronic expansion valve, the valve rod is axially movable along an axial through-hole of a valve seat of the electronic expansion valve, to open or close a valve port arranged in the valve seat in order
1. An electronic expansion valve, wherein a valve rod is provided inside a valve cavity of the electronic expansion valve, the valve rod is axially movable along an axial through-hole of a valve seat of the electronic expansion valve, to open or close a valve port arranged in the valve seat in order to allow or prevent the communication between two connecting ports of the electronic expansion valve, wherein the valve rod is provided with an axial through-hole in communication with the valve port, a lateral wall of the axial through-hole of the valve seat is sealed with respect to the valve rod, an end surface of the valve rod comprises a sealing surface able to be in contact seal with an end surface at the valve port, the sealing surface comprises a first sealing surface configured to bear an acting force of a refrigerant at one connecting port, and a second sealing surface configured to bear an acting force of a refrigerant at another connecting port; and the first sealing surface has an effective pressure-bearing area equal to an effective pressure-bearing area of the second sealing surface; wherein one of an inner lateral wall of the axial through-hole of the valve seat and an outer lateral wall of the valve rod is provided with a mounting groove, and a sealing ring is provided inside the mounting groove;wherein the valve seat comprises a valve core seat and a valve seat base, the valve core seat is inserted into the valve seat base, the axial through-hole is provided in the valve core seat, the axial through-hole of the valve core seat is a stepped hole, and the stepped hole forms a ring-shaped step surface facing a valve house (21) of the electronic expansion valve; andthe valve seat further comprises a position-limiting sleeve, the position-limiting sleeve is inserted into the stepped hole, an end portion of the position-limiting sleeve has a ring-shaped radial lug boss, the radial lug boss overlaps an end surface, facing the valve house, of the valve core seat, and the mounting groove is formed by an inner lateral wall of the valve core seat, an end surface facing the valve port of the position-limiting sleeve, and the ring-shaped step surface; andwherein the electronic expansion valve further comprises a gear system to drive the valve rod to move axially, the gear system comprises position-limiting rods to limit the circumferential rotation of the valve rod, and the position-limiting rods tightly press the position-limiting sleeve onto the valve core seat. 2. The electronic expansion valve according to claim 1, wherein the valve rod is a cylinder, which comprises a small-diameter section cylinder and a large-diameter section cylinder close to the valve port and an end surface of the large-diameter section cylinder comprises the first sealing surface and the second sealing surface. 3. The electronic expansion valve according to claim 2, wherein an outer ring diameter of the end surface of the large-diameter section cylinder is greater than or equal to an outer ring diameter of the sealing surface at the valve port, an inner ring diameter of the end surface of the large-diameter section cylinder is less than an inner ring diameter of the sealing surface at the valve port; and the outer ring diameter of the end surface of the large-diameter section cylinder, the inner ring diameter of the sealing surface at the valve port, and an outer ring diameter of the sealing surface at the valve port meet the following relationship: D1≈22D32+D42;where D1 is the outer diameter of the small-diameter section cylinder, D3 is the outer ring diameter of the sealing surface at the valve port, and D4 is the inner ring diameter of the sealing surface at the valve port. 4. The electronic expansion valve according to claim 3, wherein the inner ring diameter and the outer ring diameter of the sealing surface at the valve port meet the following relationship: 0.4 mm≦D3−D4≦4 mm. 5. The electronic expansion valve according to the claim 3, wherein an end portion of the large-diameter section cylinder and/or, one end, where the valve port (251) is arranged, of the valve seat, are provided with a chamfering. 6. The electronic expansion valve according to claim 1, wherein the valve seat comprises a valve core seat and a valve seat base, the two connecting ports and the valve port are opened in the valve seat base, the valve core seat is inserted into the valve seat base, and the axial through-hole is provided in the valve core seat. 7. The electronic expansion valve according to the claim 6, wherein the valve core seat is opened with a lateral hole in communication with one of the two connecting ports, a width of the lateral hole is increased in a direction away from the valve port, the one of the two connecting ports in communication with the lateral hole may communicate with the valve port via the lateral hole in a case that the valve rod moves axially to disengage from the valve port; the another connecting port is in communication with the valve port. 8. The electronic expansion valve according to the claim 1, wherein a check ring is provided between the sealing ring and the ring-shaped step surface, an assembling clearance exists between a lateral wall of a small-diameter section of the stepped hole of the valve core seat and the valve rod, and the check ring is in a clearance fit with the valve rod. 9. The electronic expansion valve according to the claim 1, wherein electronic expansion valve further comprises a ring-shaped slide-assisting sheet arranged inside the mounting groove, the slide-assisting sheet is in contact with the outer lateral wall of the valve rod, and the sealing ring is arranged between the slide-assisting sheet and the inner lateral wall of the valve core seat. 10. The electronic expansion valve according to the claim 9, wherein a cross section of the slide-assisting sheet is C-shaped, and a C-shaped opening of the cross section faces the sealing ring. 11. The electronic expansion valve according to the claim 9, wherein a thickness of the slide-assisting sheet ranges from 0.2 mm to 0.6 mm. 12. The electronic expansion valve according to the claim 9, wherein polytetrafluoroethylene is one of materials of the slide-assisting sheet. 13. The electronic expansion valve according to claim 2, wherein the valve seat comprises a valve core seat and a valve seat base, the two connecting ports and the valve port are opened in the valve seat base, the valve core seat is inserted into the valve seat base, and the axial through-hole is provided in the valve core seat. 14. The electronic expansion valve according to claim 3, wherein the valve seat comprises a valve core seat and a valve seat base, the two connecting ports and the valve port are opened in the valve seat base, the valve core seat is inserted into the valve seat base, and the axial through-hole is provided in the valve core seat. 15. The electronic expansion valve according to claim 4, wherein the valve seat comprises a valve core seat and a valve seat base the two connecting ports and the valve port are opened in the valve seat base, the valve core seat is inserted into the valve seat base, and the axial through-hole is provided in the valve core seat.
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이 특허에 인용된 특허 (5)
Nightingale Douglas D. J. (St. Albans GB2), Control valves.
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